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A semi-solid anode-free Cu-Li2S battery comprising Li6PS5Cl solid-state electrolyte and Li[G4]TFSI solvate ionic liquid electrolyte 认领 引用
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作者 Yun-Yu Lai Yifan Zhao +14 位作者 Jeffrey D.Cain Michael Colletta Nathaniel Hardin Hasnain Hafiz Robert Lapierre Zhongyi Liu Hernando J.Gonzalez Malabet Nicholas P.W.Pieczonka Qili Su Raneen Taha Richard Zhang Yubin Zhang David A.Muller Zhe Li Thomas A.Yersak 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第8期185-195,I0006,共11页
Conventional Li-S cells include both flammable DOL:DME liquid electrolyte and excess lithium metal,which poses a safety concern.This work presents a semi-solid anode-free Cu-Li2S cell design concept with Li[G4]TFSI... Conventional Li-S cells include both flammable DOL:DME liquid electrolyte and excess lithium metal,which poses a safety concern.This work presents a semi-solid anode-free Cu-Li2S cell design concept with Li[G4]TFSI solvate ionic liquid(SIL)electrolyte and a Li6PS5Cl solid-state electrolyte(SSE).Accelerated rate calorimetry(ARC)safety testing showed that the semi-solid cell had a thermal runaway onset temperature of 188℃ compared to only 116℃ for a conventional cell design.Improved safety of the semi-solid cell was attributed to less flammable SIL and reduced lithium content.Previous work also showed that Li-S cells with SIL electrolyte suffer from poor rate and capacity utilization because low polysulfide solubility in SIL results in sluggish reaction kinetics.Electrochemical impedance spectroscopy(EIS),cyclic voltammetry(CV),and galvanostatic charge/discharge experiments showed that 20 wt%SSE powder added to the cathode improved performance.Finally,low polysulfide concentration was harnessed to promote efficient Li stripping and plating without LiNO3.A semi-solid anode-free single-layer pouch cell achieved 50 cycles with 80%capacity retention.A fundamental study of solid electrolyte interphase(SEI)of Li metal in SIL was conducted using X-ray photoelectron spectroscopy(XPS)and cryogenic scanning transmission electron microscopy electron energy-loss spectroscopy(cryo-STEM/EELS).The data showed that limited SEI sulfurization promoted smooth and dense deposition of Li metal for good cycle life.The results presented here hold translational value to future work on anode-free cell design. 展开更多
关键词 Semi-solid Anode-free Sulfur Lithium sulfide Solvate ionic liquid Solid-state electrolyte Battery
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Breaking strength-ductility trade-off in magnesium alloy by semi-solid extrusion process:Multi-slip activation in“Bimodal Grain” 认领 引用 被引量：1
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作者 Defu Qu Xudong Du +3 位作者 Feng Wang Tingyao Wu Zhi Wang Le Zhou 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第11期5652-5668,共17页
Through the innovative integration of semi-solid rheo-casting with extrusion shear process,the short-process fabrication of low-alloyed wrought Mg-2Zn-1Mn alloy is achieved in this study.Uniaxial tensile testing of lo... Through the innovative integration of semi-solid rheo-casting with extrusion shear process,the short-process fabrication of low-alloyed wrought Mg-2Zn-1Mn alloy is achieved in this study.Uniaxial tensile testing of low-temperature extrusion shear specimens(200℃)demonstrates the exceptional strength-ductility synergy,yield strength of 277 MPa,yield strength ratio of 0.95,and elongation of 24%.Microstructural observations reveal the mechanisms underlying its high strength-plasticity synergy at room temperature.This study investigates the effects of different temperature gradients on the microstructure by analyzing experiments conducted at three temperatures:300℃,250℃,and 200◦C.Ultimately,the formation mechanism of the bimodal microstructure obtained at 200℃ is elucidated.The distinctive crystallographic texture oriented at 34°relative to the loading axis direction effectively mitigates stress concentration by inducing the synergistic activation of multiple slip systems.Furthermore,the transition trends of different slip systems and texture evolution during tensile deformation are validated through Visco-Plastic Self-Consistent(VPSC)simulations and corroborated by microstructural analysis.With geometrically necessary dislocation(GND)density(4.28×1015m-2)and pyramidal slip activation(~45%).This study has successfully broken through the bottleneck of strength-ductility trade-off in magnesium alloys,providing theoretical support for the development of high-reliability magnesium alloys. 展开更多
关键词 Magnesium alloy Semi-solid extrusion shear Geometry necessary dislocation Multi-slip system activation Bimodal grain
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Effect of single winding helical electromagnetic stirring on microstructure and mechanical properties of semi-solid Al-Mg2Si in-situ composites 认领 引用
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作者 Dong Pan Qing-tao Guo +7 位作者 Yi-tong Wang Bing-jun Lu Xue-feng Tang Hua-song Liu Pei Xu Xiao-lei Zhu Chong-yi Wei Yu Zhang 《China Foundry》 SCIE EI CAS CSCD 2025年第4期449-462,共14页
The Al-Mg2Si in-situ composite is a lightweight material with great potential for application in fields such as automotive lightweighting,aerospace,and electronic components.In this research,the modification,semi-s... The Al-Mg2Si in-situ composite is a lightweight material with great potential for application in fields such as automotive lightweighting,aerospace,and electronic components.In this research,the modification,semi-solid technology coupled with different types of electromagnetic stirring was applied to regulate the undesirable solidified dendritic microstructure and facilitate the composites’mechanical properties.The spheroidization and refinement of Mg2Si andα-Al matrix in SM(semi-solid)+RES(rotate electromagnetic stirring)sample and SM+SHES(single winding helical electromagnetic stirring)sample are realized under the effect of fused dendrite arm,the decreased critical nucleate radius,and the increased nucleation rate and extra supercooling degree induced by electromagnetic stirring.The Mg2Si phase in the SM+RES sample and SM+SHES sample is refined by 73.4%and 75.7%,respectively compared to the AC(as-cast)sample.Besides,the single winding electromagnetic stirring can lead to more homogeneously distributed physical fields,lower temperature gradient,and more significant mass transfer,mainly responsible for the more homogeneous distributed reinforced finer Mg2Si particles in the SM+SHES sample.Moreover,both the tensile properties and hardness of modified semi-solid composites are improved through electromagnetic stirring.Compared with RES,the improvement effect of SHES is more excellent.The SM+SHES sample possesses the highest Brinell hardness(124.7 HB),and its quality index of tensile properties is 5.73%and 82.2%higher than that of the SM+RES and AC samples,respectively. 展开更多
关键词 electromagnetic stirring Al-Mg2Si composites semi-solid mechanical properties modification
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Optimizing Semi-Solid Fermentation Substrates for Enhanced Conidia Production of Nomuraea rileyi(Farlow)Samson as a Biopesticides for Insect Control 认领 引用
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作者 Xuan Trinh Thi Mai Lam Thi Xuan +2 位作者 Xuan Le Thi Ngoc Son Pham Kim Dao Truong Thanh Quynh 《Research in Ecology》 CAS 2025年第3期17-27,共11页
Biological insecticides have gained importance in modern society because they cause minimal environmental harm and reduce pests’ability to develop resistance.Nomuraea rileyi,a facultative entomopathogenic fungus,is s... Biological insecticides have gained importance in modern society because they cause minimal environmental harm and reduce pests’ability to develop resistance.Nomuraea rileyi,a facultative entomopathogenic fungus,is suitable for infecting lepidopteran pests,including Spodoptera litura and Helicoverpa armigera.This work aims to identify a suitable semi-solid fermentation medium to increase the conidia production of N.rileyi and enhance its biological control ability as mycoinsecticide.Research is carried out on broken rice,wheat,sorghum,and corn as substrates,both with and without nutrient addition.It also covers incubation under set conditions,colony harvesting,and conidial yield and germination determination using a haemocytometer.All the study was conducted using a completely randomized design(CRD)and a test of significance was set at p<0.05 using analysis of variance(ANOVA).This work aimed to establish the effect of various substrates on growth and conidia formation in N.rileyi.The highest conidia count of 10×108CFU/g on day 15.The result was obtained from BR+Nu followed by sorghum 7×108CFU/g,corn 7×108CFU/g and wheat 6.5×108CFU/g.Thus,post-drying,the highest corresponding viability was observed in the product containing BR+Nu–6.20×108CFU/g.Adding rice bran(BR+RB,150 g each)still increases conidial yield up to 14×108 CFU/g at 15 DAI.These indings thus assert that broken rice and supplementation affect conidia yield and viability. 展开更多
关键词 Nomuraea Rileyi Biopesticides Semi-solid Fermentation Entomopathogenic Fungi
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Comparison of gastric emptying of solid and semi-solid meals using real-time ultrasonography in healthy Sri Lankan adults 认领 引用
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作者 Lakmali Amarasiri Minerva de Silva +1 位作者 Hithanadura Janaka de Silva Niranga M Devanarayana 《World Journal of Gastrointestinal Pathophysiology》 2025年第3期127-135,共9页
BACKGROUND Routine assessment of solid gastric emptying is challenging due to the prolonged test duration and complex meal preparation.Replacing solid test meals with easily prepared,commercially available semisolid m... BACKGROUND Routine assessment of solid gastric emptying is challenging due to the prolonged test duration and complex meal preparation.Replacing solid test meals with easily prepared,commercially available semisolid meals and shortening the test duration can significantly enhance the feasibility and practicality of gastric emptying evaluations.AIM To compare the gastric emptying and antral motility of solid vs semi-solid meals of similar volume and nutritional consistency,and to assess the feasibility of meal substitution and reduction in test duration during the solid gastric emptying assessment.METHODS Thirty healthy volunteers(17 males,age:29.4±6.0 years,body mass index:23.4±2.94 and 13 females,age:37.2±11.9 years,body mass index:22.9±4.34)underwent gastric emptying by real-time ultrasonography after a solid meal and a comparable commercially prepared semi-solid meal(each meal,total calorie 350 kcal,carbohydrates 60%,fat 30%and proteins 10%),on separate dates 1 week apart.The gastric antral area was measured at 5 minutes,15 minutes,30 minutes,45 minutes,60 minutes,90 minutes,120 minutes,150 minutes,180 minutes,210 minutes,and 240 minutes post-ingestion using a previously validated technique and compared between meals.RESULTS Mean and median antral areas,gastric emptying rates,gastric residual ratios,and motility index at each time point were almost similar between meals for up to 3 hours.At the end of 4 hours,the mean emptied percentage of the semisolid meal and solid meal was 81.1%and 70.6%,respectively.The emptying rate of the semisolid meal at 90 minutes significantly correlated with that of 240 minutes.There was no correlation between the solid meal emptying rates at 90 minutes and 240 minutes.CONCLUSION Gastric emptying,residual antral cross-sectional area and antral motility of a semisolid meal are almost similar to that of a solid meal of the same nutritional value until three hours post-ingestion.A semisolid test meal can effectively substitute a solid test meal during ultrasound assessment of gastric emptying,without compromising the validity of the results.Additionally,the ease of preparation and administration of semisolid meals enhances the overall feasibility of gastric emptying assessments. 展开更多
关键词 Antral motility Gastric emptying Gastric residual ratio Solid meal Semi-solid meal Real-time ultrasonography
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Microstructures and mechanical properties of semi-solid squeeze casting ZL104 connecting rod 认领 引用 被引量：11
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作者 王永飞 赵升吨 张晨阳 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第2期235-243,共9页
Semi-solid squeeze casting（SSSC） and liquid squeeze casting（LSC） processes were used to fabricate a ZL104 connecting rod, and the influences of the process parameters on the microstructures and mechanical properti... Semi-solid squeeze casting（SSSC） and liquid squeeze casting（LSC） processes were used to fabricate a ZL104 connecting rod, and the influences of the process parameters on the microstructures and mechanical properties were investigated. Results showed that the tensile strength and elongation of the SSSC-fabricated rod were improved by 22% and 17%, respectively, compared with those of the LSC-fabricated rod. For SSSC, the average particle size（APS） and the shape factor（SF） increased with the increase of re-melting temperature（Tr）, whereas the tensile strength and elongation increased first and then decreased. The APS increased with increasing the mold temperature（Tm）, whereas the SF increased initially and then decreased, which caused the tensile strength and elongation to increase initially and then decrease. The APS decreased and the SF increased as squeezing pressure（ps） increased, and the mechanical properties were enhanced. Moreover, the optimal Tr, ps and Tm are 848 K, 100 MPa and 523 K, respectively. 展开更多
关键词 aluminum alloy semi-solid squeeze casting semi-solid microstructure tensile strength elongation connecting rod
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Feasibility of semi-solid die casting of ADC12 aluminum alloy 认领 引用 被引量：9
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作者 S.JANUDOM T.RATTANOCHAIKUL +2 位作者 R.BURA PA S.WISUTMETHANGOON J.WANNASIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第9期1756-1762,共7页
The feasibility of semi-solid die casting of ADC12 aluminum alloy was studied. The effects of plunger speed, gate thickness, and solid fraction of the slurry on the defects were determined. The defects investigated ar... The feasibility of semi-solid die casting of ADC12 aluminum alloy was studied. The effects of plunger speed, gate thickness, and solid fraction of the slurry on the defects were determined. The defects investigated are gas and shrinkage porosity. In the experiments, semi-solid slurry was prepared by the gas-induced semi-solid （GISS） technique. Then, the slurry was transferred to the shot sleeve and injected into the die. The die and shot sleeve temperatures were kept at 180 ℃ and 250 ℃, respectively. The results show that the samples produced by the GISS die casting give little porosity, no blister and uniform microstructure. From all the results, it can be concluded that the GISS process is feasible to apply in the ADC12 aluminum die casting process. In addition, the GISS process can give improved properties such as decreased porosity and increased microstructure uniformity. 展开更多
关键词 ADC12 aluminum alloys semi-solid die casting gas induced semi-solid （GISS） rheocasting
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Development of aluminum rheo-extrusion process using semi-solid slurry at low solid fraction 认领 引用 被引量：3
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作者 T.RATTANOCHAIKUL S.JANUDOM +1 位作者 N.MEMONGKOL J.WANNASIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第9期1763-1768,共6页
An aluminum extrusion process is mainly used to fabricate long tubes, beams and rods for various applications. However, this process has a high production cost due to the need for investment of high-pressure machinery... An aluminum extrusion process is mainly used to fabricate long tubes, beams and rods for various applications. However, this process has a high production cost due to the need for investment of high-pressure machinery. The objective of this work is to develop a new semi-solid extrusion process using semi-solid slurry at low solid fractions. A laboratory extrusion system was used to fabricate aluminum rods with the diameter of 12 ram. The semi-solid metal process used in this study was the gas induced semi-solid （GISS） technique. To study the feasibility of the GISS extrusion process, the effects of extrusion parameters such as plunger speed and solid fi-action on the extrudability, microstructure, and mechanical properties of extruded samples were investigated. The results show that the plunger speed and solid fraction of the semi-solid metal need to be carefully controlled to produce complete extruded parts. 展开更多
关键词 aluminum alloys extrusion semi-solid metal rheo-extrusion gas induced semi-solid （GISS）
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Effects of compressing and remelting in SIMA processing on semi-solid structure evolution of an Al-Zn wrought alloy 认领 引用 被引量：6
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作者 LIUChangming ZOUMaohua 《Rare Metals》 SCIE EI CAS 2003年第3期185-191,共7页
Structure evolution of an Al-Zn wrought alloy in remelting processing in thestrain induced melt activated (SIMA) serai-solid procedure was observed, and effects of factors, theremelting temperature, the holding time, ... Structure evolution of an Al-Zn wrought alloy in remelting processing in thestrain induced melt activated (SIMA) serai-solid procedure was observed, and effects of factors, theremelting temperature, the holding time, and the compression strain, on structures and grain sizesof the alloy were investigated. The results show that (1) the proper temperature of remelting is inthe range of 610 to 615℃; (2) the grain size in specimen with greater compression strain is smallerthan that with smaller compression strain in condition of the same remelting temperature andholding time, and the grain size in local area with great local equivalent strain is smaller thanthat with small one; (3) liquid occurs in form of cluster in matrix during remelting and itsquantity increases with remelting time increasing; liquid in specimen with great compression strainoccurs earlier than that with small one, and quantity of liquid in the center of specimen withgreater local equivalent strain is greater than that in the two ends of it; (4) distortion energyafter deforming in matrix of the alloy is the significant factor to activate melting of matrix atlocal area with great local equivalent strain. 展开更多
关键词 semi-solid structure evolution strain induced melt activated processing semi-solid remelting Al-Zn alloy
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Direct preparation of semi-solid billets by the semi-solid isothermal heat treatment for commercial cold-rolled ZL104 aluminum alloy 认领 引用 被引量：1
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作者 Yong-fei Wang Yi Guo +1 位作者 Sheng-dun Zhao Xiao-guang Fan 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第7期1164-1173,共10页
Semi-solid isothermal heat treatment was proposed to directly process cold-rolled ZL104 aluminum alloys and obtain semi-solid bil-lets.The effects of two process parameters,namely,temperature and processing time,on th... Semi-solid isothermal heat treatment was proposed to directly process cold-rolled ZL104 aluminum alloys and obtain semi-solid bil-lets.The effects of two process parameters,namely,temperature and processing time,on the microstructure and hardness of the resulting bil-lets were also experimentally examined.Average grain size(AGS)increased and the shape factor(SF)of the grain improved as the process temperature increased.The SF of the grain also increased with increasing processing time,and the AGS was augmented when the processing time was prolonged from 5 to 20 min at 570℃.The hardness of the aluminum alloy decreased because of the increase in AGS with increasing temperature and processing time.The optimal temperature and time for the preparation of semi-solid ZL104 aluminum alloys were 570℃and 5 min,respectively.Under optimal process parameters,the AGS,SF,and hardness of the resulting alloy were 35.88μm,0.81,and 55.24 MPa,respectively.The Lifshitz-Slyozov-Wagner relationship was analyzed to determine the coarsening rate constant at 570℃,and a rate constant of 1357.2μm3/s was obtained. 展开更多
关键词 semi-solid aluminum alloy microstructure hardness semi-solid isothermal heat treatment
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Microstructural evolution of equal channel angular pressed AZ91D magnesium alloy during semi-solid isothermal heat treatment 认领 引用 被引量：2
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作者 Chen Tijun Lu Guoxiang Hao Yuan 《China Foundry》 SCIE CAS 2008年第4期234-239,共6页
The microstructural evolution of AZ91D magnesium alloy processed by equal channel angular pressing during isothermal heat treatment at 570℃was investigated.The results indicated that the equal channel angular pressin... The microstructural evolution of AZ91D magnesium alloy processed by equal channel angular pressing during isothermal heat treatment at 570℃was investigated.The results indicated that the equal channel angular pressing followed by semi-solid isothermal heat treatment was an effective method to prepare semi-solid nondendritic slurry of AZ91D magnesium alloy.During this process,its microstructure change underwent four stages,the initial coarsening stage,the structure separation stage,the spheroidization stage and the final coarsening stage.The microstructural spheroidization effect was the best after being heated for 15 min for the alloy pressed for four passes,and the grain size was the smallest.With the further increase of heating time,the grain size and shape factor increased.When the heating time was kept constant,the grain size and shape factor decreased with the increase of pressing passes. 展开更多
关键词 AZ91D magnesium alloy semi-solid isothermal heat treatment microstructure semi-solid forming
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Semi-solid squeeze casting process of a ZL109 alloy 认领 引用 被引量：1
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作者 ZHAI Yanbo LIU Changming +1 位作者 HAN Zhaotang WANG Kai 《Rare Metals》 SCIE EI CAS 2008年第3期329-333,F0003,共5页
The structure evolution of the ZL109 alloy in the process of semi-solid squeeze casting and the mechanical properties of the components were investigated.The results show that(1)the eutectic silicon phase in original ... The structure evolution of the ZL109 alloy in the process of semi-solid squeeze casting and the mechanical properties of the components were investigated.The results show that(1)the eutectic silicon phase in original billets is refined in the low super-heat casting process;(2)the eutectic structure in billets starts to fuse and the crystals of the eutectic silicon phase are refined further and sphericized in the remelting process of billets;(3)in the semi-solid squeeze casting process,the sphericity of the a phase and the refining of the silicon phase occur,owing to the friction between solid and liquid;(4)in the process of heat treatment,the eutectic a phase aggregates with the primary a phase and the eutectic silicon pieces aggregate together.The elongation of the semi-solid component after heat treatment rises to 1.42%. 展开更多
关键词 ZL109 alloy mechanical property semi-solid squeeze casting semi-solid remelting
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Research Status of Preparation Technique of Aluminum Alloy Semi-solid Slurry 认领 引用
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作者 Xiu Lei Gu Haozhong +2 位作者 Lv Anna Hong Ronghui Zhang Zhirong 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2024年第12期3358-3372,共15页
Semi-solid processing(SSP)technique is an important method for metal casting.Products made by SSP technique have advantages such as small solidification shrinkage,high dimensional accuracy of castings,fast forming spe... Semi-solid processing(SSP)technique is an important method for metal casting.Products made by SSP technique have advantages such as small solidification shrinkage,high dimensional accuracy of castings,fast forming speed,high productivity,and good mechanical properties.Aluminum alloy products produced by SSP technique can be heat-treated.The mechanical properties of the products after heat treatment are similar to those of steel,but they have the lighter mass and are widely used in many fields.Semisolid slurry preparation technique is one of the key techniques in the field of aluminum alloy semi-solid forming,which determines the industrial application of semi-solid forming and also has significant impact on the quality of aluminum alloy semi-solid slurry.Semi-solid slurry preparation technique with the continuous development has become the emerging technique in the field of metal processing.The principles,advantages and disadvantages of various semi-solid slurry preparation techniques for metal materials were reviewed,and the future trends of semi-solid slurry preparation techniques were predicted. 展开更多
关键词 aluminum alloy semi-solid forming semi-solid slurry preparation techniques
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Semi-solid processing of aluminum and magnesium alloys:Status,opportunity,and challenge in China 认领 引用 被引量：29
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作者 Gan LI Wen-ying QU +8 位作者 Min LUO Le CHENG Chuan GUO Xing-gang LI Zhen XU Xiao-gang HU Da-quan LI Hong-xing LU Qiang ZHU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第11期3255-3280,共26页
Owing to its low cost,short process and low energy consumption,semi-solid processing(SSP)of aluminum(Al)and magnesium(Mg)alloys has been considered as a competitive approach to fabricate complicated components with ex... Owing to its low cost,short process and low energy consumption,semi-solid processing(SSP)of aluminum(Al)and magnesium(Mg)alloys has been considered as a competitive approach to fabricate complicated components with excellent performance.Over the past decade,significant progress has been achieved in deeply understanding the SSP process,the microstructure and performance of the fabricated components in China.This paper starts with a retrospective overview of some common slurry preparation methods,followed by presenting the performance and the underlying mechanisms of SSP fabricated alloys.Then,the mainstream opinions on the microstructure evolution and rheological flow behavior of semi-solid slurry are discussed.Subsequently,the general situation and some recent examples of industrial applications of SSP are presented.Finally,special attention is paid to the unresolved issues and the future directions in SSP of Al and Mg alloys in China. 展开更多
关键词 semi-solid processing aluminum alloys magnesium alloys slurry preparation numerical modeling performance industrial applications
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New Technique of Casting-rolling Strips for Semi-solid Magnesium Alloys 认领 引用 被引量：12
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作者 Shuisheng XIE Maopeng GENG +4 位作者 Xinmin ZHOU Ying ZHANG Songyang ZHANG Yanchun WANG Guojie HUANG 《Journal of Materials Science & Technology》 SCIE EI CAS 2005年第6期785-787,共3页
The conjugation of semi-solid process technique and casting-rolling technique applied to produce the magnesium strips was studied. The semi-solid slurry has been prepared continuously by the mechanical method and its ... The conjugation of semi-solid process technique and casting-rolling technique applied to produce the magnesium strips was studied. The semi-solid slurry has been prepared continuously by the mechanical method and its temperature was controlled strictly at the same time. AZ91D and AZ31 casting magnesium alloys were applied to the experiment. The casting-rolling strips with non-dendritic structure were obtained and its main mechanical property is better. The process ability of the casting-rolling strips was studied. It is significative to link the semi-solid process techniques and casting-rolling techniques, through which we can get high quality magnesium alloy strips with non-dendritic structure and improve the overall properties of the products. 展开更多
关键词 Casting-rolling Semi-solid Magnesium alloy AZ91D AZ31
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Effect of cooling condition on microstructure of semi-solid AZ91 slurry produced via ultrasonic vibration process 认领 引用 被引量：22
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作者 张亮 吴国华 +1 位作者 王少华 丁文江 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第10期2357-2363,共7页
The effects of cooling conditions on the microstructure of semi-solid AZ91 slurry produced via ultrasonic vibration process were investigated. AZ91 melts were subjected to ultrasonic vibration in different temperature... The effects of cooling conditions on the microstructure of semi-solid AZ91 slurry produced via ultrasonic vibration process were investigated. AZ91 melts were subjected to ultrasonic vibration in different temperature ranges under different cooling rates. The results show that fine and spherical α-Mg particles are obtained under ultrasonic vibration at the nucleation stage, which is mainly attributed to the cavitation and acoustic streaming induced by the ultrasonic vibration. The reduction of lower limit of ultrasonic vibration temperature between the liquidus and solidus increases the solid volume fraction and average particle size. Increasing cooling rate increases the solid volume fraction and reduces the average shape factor of particles. The appropriate temperature range for ultrasonic vibration is from 605 °C to 595 °C or 590 °C, and the suitable cooling rate is 2-3 °C/min. 展开更多
关键词 AZ91 alloy semi-solid ultrasonic vibration microstructure cooling condition
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Research on semi-solid thixoforming process of AZ91D magnesium alloy brackets for generators in JH70-type motorbikes 认领 引用 被引量：9
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作者 WANG Kai LIU Changming +2 位作者 HAN Zhaotang CAO Jianyong ZHANG Zonghe 《Rare Metals》 SCIE EI CAS 2005年第4期381-391,共11页
The investment on semi-solid die casting processes of AZ91D magnesium alloy brackets for generators in JH70-type motorbikes is introduced. The processes of low super-heat and cooling slope for the preparation of bille... The investment on semi-solid die casting processes of AZ91D magnesium alloy brackets for generators in JH70-type motorbikes is introduced. The processes of low super-heat and cooling slope for the preparation of billets with non-dendritic microstructure, the remelting of billets for thixoforming and the parameters in the process of semi-sohd thixoforming have been researched. The results show that primary billets with non-dendritical structures can be prepared by forming great amount of nuclei in melt via the process of low super heat. By optimizing the remelting process through adjusting the current of the induced equipment, semi-solid billets with a structure of spherical grains were obtained from the primary billets with non-dendritical structure. The range of 580℃ to 583℃ is the proper remelting temperatures by which the billets have an expected thixotropy and can be transferred to a die-casting machine. The optimized parameters of semi-solid forming in a die-casting machine are as follows： the area of the ingate in the die is 383.5 mm^2, the speed of the pierce of the machine 5 m/s, the shot pressure of the pierce 75 MPa, and the maintenance pressure of the pierce 350 MPa. The castings of brackets for supporting generators in JH70 type motorbikes were formed by adopting the optimized processes and parameters mentioned above. 展开更多
关键词 semi-solid thixoforming AZ91D magnesium alloy bracket motorbike
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Microstructure and Gd-rich phase evolution of as-cast AZ31-xGd magnesium alloys during semi-solid isothermal heat treatment 认领 引用 被引量：12
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作者 CHU Chen-liang WU Xiao-quan +5 位作者 QIU Shui-cai TANG Bin-bing YIN Zheng YAN Hong LUO Chao HU Zhi 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第1期1-15,共15页
The microstructure and Gd-rich phase evolution of as-cast AZ31-xGd(x=0,1.5 wt.%,2.0 wt.%and 2.5 wt.%)magnesium alloys during semi-solid isothermal heat treatment were investigated deeply in the present work.Results sh... The microstructure and Gd-rich phase evolution of as-cast AZ31-xGd(x=0,1.5 wt.%,2.0 wt.%and 2.5 wt.%)magnesium alloys during semi-solid isothermal heat treatment were investigated deeply in the present work.Results showed that the lamellar(Mg,Al)3Gd phases transformed into the particle-like Al2Gd phases in AZ31 magnesium alloys with Gd addition during semi-solid isothermal heat treatment,leading to yielding more sphericalα-Mg grains.When Gd content is 2.0 wt.%,the size of semi-solid spherical grains reaches the minimum.The main mechanism of grain refinement lies in the remelting of dendritic branches as well as the auxiliary effect of a small number of Al2Gd particles as grain refining inoculants.Meanwhile,Al2Gd particles enriched at the solid-liquid interfaces can remarkably retard the growth rate ofα-Mg grains.A reduction of deformation resistance has been successfully achieved in AZ31-2.0Gd magnesium alloy after semi-solid isothermal heat treatment,which shows a moderate compressive deformation resistance(230 MPa),comparing to the as-cast AZ31 magnesium alloy(280 MPa)and semi-solid AZ31 magnesium alloy(209 MPa). 展开更多
关键词 magnesium microstructure rare earth element Al2Gd particle semi-solid isothermal heat treatment
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Evolution of microstructure in semi-solid slurries of rheocast aluminum alloy 认领 引用 被引量：15
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作者 R.CANYOOK S.PETSUT +2 位作者 S.WISUTMETHA NGOON M.C.FLEMINGS J.WANNASIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第9期1649-1655,共7页
Semi-solid metal processing is being developed in die casting applications to give several cost benefits. To efficiently apply this emerging technology, it is important to understand the evolution of microstructure in... Semi-solid metal processing is being developed in die casting applications to give several cost benefits. To efficiently apply this emerging technology, it is important to understand the evolution of microstructure in semi-solid slurries for the control of the theological behavior in semi-solid state. An experimental apparatus was developed which can capture the grain structure at different times at early stages to understand how the semi-solid structure evolves. In this technique, semi-solid slurry was produced by injecting fine gas bubbles into the melt through a graphite diffuser during solidification. Then, a copper quenching mold was used to draw some semi-solid slurry into a thin channel. The semi-solid slurry was then rapidly frozen in the channel giving the microstructure of the slurry at the desired time. Samples of semi-solid 356 aluminum alloy were taken at different gas injection times of 1, 5, 10, 15, 20, 30, 35, 40, and 45 s. Analysis of the microstructure suggests that the fragmentation by remelting mechanism should be responsible for the formation of globular structure in this rheocasting process. 展开更多
关键词 microstructure evolution rheocasting rapid quenching method 356 aluminum alloy gas induced semi-solid （GISS） formation mechanism
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Deformation mechanism and forming properties of 6061Al alloys during compression in semi-solid state 认领 引用 被引量：12
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作者 尚淑珍 路贵民 +2 位作者 唐小玲 赵祖欣 吴成明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第9期1725-1730,共6页
The 6061 semi-solid aluminium alloy feedstocks prepared by near-liquidus casting were compressed in semi-solid state by means of Gleeble-3500 thermal-mechanical simulator.The relationship between the true stress and t... The 6061 semi-solid aluminium alloy feedstocks prepared by near-liquidus casting were compressed in semi-solid state by means of Gleeble-3500 thermal-mechanical simulator.The relationship between the true stress and the true strain at different temperatures and strain rates was studied with the deformation degree of 70%.The microstructures during the deformation process were characterized.The deformation mechanism and thixo-forming properties of the semi-solid alloys were analyzed.The results show that the homogeneous and non-dendrite microstructures of semi-solid 6061Al alloy manufactured by near-liquidus casting technology could be transformed into semi-solid state with the microstructure suitable for thixo-forming which are composed of near-spherical grains and liquid phase with eutectic composition through reheating process.The deformation temperature and strain rate affect the peak stress significantly rather than steady flow stress.The resistance to deformation in semi-solid state decreases with the increase of the deformation temperature and decrease of the strain rate.At steady thixotropic deformation stage, the thixotropic property is uniform, and the main deformation mechanism is the rotating or sliding between the solid particles and the plastic deformation of the solid particles. 展开更多
关键词 semi-solid processing 6061Al alloy compression deformation microstructural evolution thixotropic property
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