期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到7篇文章
< 1 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Achieving ultra-high mechanical properties in metastable Co-free medium entropy alloy via hierarchically heterogeneous microstructure 认领 引用 被引量：2
1
作者 Qiuyu Gao Xinghua Zhang +7 位作者 Shilin Feng Zhenhua Han Chen Chen Tan Wang Shaojie Wu Yongfu Cai Fushan Li Ran Wei 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第16期175-183,共9页
A new metastable dual-phase Fe59 Cr13 Ni18 Al10 medium entropy alloy(MEA)with hierarchically heteroge-neous microstructure from micro-to nano-scale was designed in this work.Partially recrystallized FCC phase and lots... A new metastable dual-phase Fe59 Cr13 Ni18 Al10 medium entropy alloy(MEA)with hierarchically heteroge-neous microstructure from micro-to nano-scale was designed in this work.Partially recrystallized FCC phase and lots of NiAl-rich B2 precipitates are obtained by annealing and aging treatment.The yield strength of the MEA at room temperature(298 K)and liquid nitrogen temperature(77 K)increased from∼910 MPa and∼1250 MPa in the annealed state,respectively,to∼1145 MPa and∼1520 MPa in the aged state,while the uniform elongation maintained more than 15%.The excellent mechanical properties of the MEA both at 298 and 77 K are attributed to the co-activation of multiple strengthening mech-anisms,including fine grain,dislocation,precipitation,transformation-induced plasticity,stacking faults,and nano-twins. 展开更多
关键词 Medium entropy alloy Precipitation strengthening Heterogeneous microstructure Transformation-induced plasticity Mechanical properties
暂未订购 下载PDF
Novel Co-free high performance TRIP and TWIP medium-entropy alloys at cryogenic temperatures 认领 引用 被引量：9
2
作者 Ran Wei Kaisheng Zhang +6 位作者 Liangbin Chen Zhenhua Han Tan Wang Chen Chen Jianzhong Jiang Tingwei Hu Fushan Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第22期153-158,共6页
Recently,high-and medium-entropy alloys(HEAs and MEAs) have been found to exhibit excellent cryogenic mechanical properties,but most of them contain high-priced Co element.Therefore,developing HEAs or MEAs with high s... Recently,high-and medium-entropy alloys(HEAs and MEAs) have been found to exhibit excellent cryogenic mechanical properties,but most of them contain high-priced Co element.Therefore,developing HEAs or MEAs with high strength and ductility and relatively low cost is urgent.In this work,novel Cofree Fex Mn(75-x) Ni(10)Cr(15)(x=50 and 55 at.%) MEAs were developed,which exhibit a good combination of low cost,high strength and ductility at cryogenic temperature.It was found that the Fe(50)Mn(25)Ni(10)Cr(15)MEA exhibits a combination of cryogenic tensile strength of^0.98 GPa and ductility of^83 %.The excellent cryogenic mechanical properties were attributed to joint of twinning-induced plasticity(TWIP) and transformation-induced plasticity(TRIP) effects.The present study sheds light on developing low cost MEAs with high perfo rmance for cryogenic-tempe rature applications. 展开更多
关键词 Medium-entropy alloys(MEAs) Transformation-induced plasticity(TRIP) Twinning induced plasticity(TWIP) Mechanical properties Cryogenic temperature
暂未订购 下载PDF
Toughening FeMn-based high-entropy alloys via retarding phase transformation 认领 引用 被引量：4
3
作者 Ran Wei Kaisheng Zhang +7 位作者 Liangbin Chen Zhenhua Han Chen Chen Tan Wang Jianzhong Jiang Tingwei Hu Shaokang Guan Fushan Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第16期167-172,共6页
Various high entropy alloys(HEAs)with improved mechanical properties were developed by reducing the phase stability and then promote the phase transformation.The promotion of deformation-induced ma rtensitic transform... Various high entropy alloys(HEAs)with improved mechanical properties were developed by reducing the phase stability and then promote the phase transformation.The promotion of deformation-induced ma rtensitic transformation from face-centered cubic(fcc)to hexagonal close-packed(hcp)mostly focuses on overcoming the trade-off of strength-ductility of HEAs at room temperature.However,the hcp phase is brittle at cryogenic-temperature,and thus the enhancement of cryogenic ductility of these HEAs still remains a challenge.Here,we present a concept to toughening Fe50Mn30Co10Cr10 HEAs at cryogenictemperature via retarding phase transformation.The retarded but more persistent phase transformation at high strain level was realized via tailoring the grain size.To further verify the effect of phase transformation rate on ductility of HEAs,the mechanical properties of Fe40Mn40Co10Cr10 HEAs with higher stacking fault energy were tested at room and cryogenic temperature,respectively.The present study sheds light on developing high perfo rmance HEAs,especially for alloys with brittle phase transformation products. 展开更多
关键词 High-entropy alloys(HEAs) Transformation induced ductility Mechanical properties Cryogenic temperature
暂未订购 下载PDF
Design and high-strength origin of novel (CoFeNi)80Ti5V15 medium entropy alloy with “fcc + L12 ”structure 认领 引用 被引量：3
4
作者 Lei Wang Xinyuan Wu +7 位作者 Yuan Wu Gang Liu Zhenhua Han Yunpeng Zhang Yanning Su Shengfeng Kang Jun Shen Guojun Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第18期154-160,共7页
1.Introduction The multi-component high entropy alloys(HEAs)or medium entropy alloys(MEAs)attract reseachers’extensive attention,in particular,the single-face center cubic(fcc)HEAs or MEAs due to their some advantage... 1.Introduction The multi-component high entropy alloys(HEAs)or medium entropy alloys(MEAs)attract reseachers’extensive attention,in particular,the single-face center cubic(fcc)HEAs or MEAs due to their some advantages,such as excellent ductility[1,2],good corrosion resistance[3]and high radiation tolerance[4].However,their strength is commonly insufficient for engineering applica-tions.Recently,many investigations are ongoing to improve their strength by traditional strengthening mechanisms,like fine-grained strengthening[5,6],solid strengthening[6-8],strain strengthening[9],polyphase strengthening[10-12],and precipitation strength-ening[13-15].Among these strengthening mechanisms,the co-herent L12-type nanoparticles precipitation strengthening has been proven to be a very effective way to improve their strength[13-15]. 展开更多
关键词 strengthening strength alloy
暂未订购 下载PDF
Multi-field Coupling Simulation of Impact of Temperature and Density of Heat Injection Well on Carbon Budget during Hydrate Exploitation in Qilian Mountain Permafrost Region 认领 引用 被引量：1
5
作者 Zhenhua Han Ruirui Li +2 位作者 Luqing Zhang Jian Zhou Song Wang 《Journal of Earth Science》 SCIE CAS CSCD 2024年第6期1934-1943,共10页
Permafrost regions of Qilian Mountains in China are rich in gas hydrate resources.Once greenhouse gases in deep frozen layer are released into the atmosphere during hydrate mining,a series of negative consequences occ... Permafrost regions of Qilian Mountains in China are rich in gas hydrate resources.Once greenhouse gases in deep frozen layer are released into the atmosphere during hydrate mining,a series of negative consequences occur.This study aims to evaluate the impact of hydrate thermal exploitation on regional permafrost and carbon budgets based on a multi-physical field coupling simulation.The results indicate that the permeability of the frozen soil is anisotropic,and the low permeability frozen layer can seal the methane gas in the natural state.Heat injection mining of hydrates causes the continuous melting of permafrost and the escape of methane gas,which transforms the regional permafrost from a carbon sink to a carbon source.A higher injection temperature concentrates the heat and causes uneven melting of the upper frozen layer,which provides a dominant channel for methane gas and results in increased methane emissions.However,dense heat injection wells cause more uniform melting of the lower permafrost layer,and the melting zone does not extend to the upper low permeability formation,which cannot provide advantageous channels for methane gas.Therefore,a reasonable and dense number of heat injection wells can reduce the risk of greenhouse gas emissions during hydrate exploitation. 展开更多
关键词 permafrost gas hydrates carbon budget methane emissions greenhouse gases environmental effects multi-field coupling simulation
暂未订购 下载PDF
Achieving high strength and ductility in Fe50Mn25Ni10Cr15 medium entropy alloy via Al alloying 认领 引用 被引量：4
6
作者 Zhen Jiang Ran Wei +7 位作者 Wenzhou Wang Mengjia Li Zhenhua Han Shuhan Yuan Kaisheng Zhang ChenChen Tan Wang Fushan Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第5期20-26,共7页
The microstructure and tensile properties of(Fe50Mn25Ni10Cr15)100-xAlx(x=0-8 at.%)medium-entropy alloys(MEAs)were investigated.It was found that the crystalline structure changes from face-centered c... The microstructure and tensile properties of(Fe50Mn25Ni10Cr15)100-xAlx(x=0-8 at.%)medium-entropy alloys(MEAs)were investigated.It was found that the crystalline structure changes from face-centered cubic(FCC)single phase to FCC+body-centered cubic(BCC)dual-phase with the increase of Al content.Therefore,the addition of Al elements with large atomic size could induce solid solution strengthening and dual-phase heterogeneous structure strengthening.Correspondingly,the present MEAs exhibit excellent combinations of yield strength,ultimate tensile strength(UTS)and ductility both at 298 and 77 K.Among the MEAs,the(Fe50Mn25Ni10Cr15)95Al5 alloy has a remarkable combination of cryogenic UTS(1077 MPa)and ductility(~85%),and has lower raw material costs than the reported high-entropy alloys(HEAs)and MEAs.The correlation among microstructure and mechanical properties and the corresponding strengthening mechanism were clarified. 展开更多
关键词 Medium entropy alloys Microstructure Mechanical properties Cryogenic temperature
暂未订购 下载PDF
Cooperative Jobs Dispatching in Edge Computing Network with Unpredictable Uploading Delay 认领 引用
7
作者 Bojie Lyu Yuncong Hong +2 位作者 Haisheng Tan Zhenhua Han Rui Wang 《Journal of Communications and Information Networks》 EI CSCD 2020年第1期75-85,共11页
In this paper,the cooperative jobs dispatching problem in an edge computing network with multiple access points(APs)and edge servers is considered.Due to the uncertain traffic in the network between APs and edge serve... In this paper,the cooperative jobs dispatching problem in an edge computing network with multiple access points(APs)and edge servers is considered.Due to the uncertain traffic in the network between APs and edge servers,the job uploading delay can not be predicted accurately.Specifically,the job arrivals at the APs,the job uploading delay from APs to edge servers and the job computation time at the edge servers are all modeled as random variables.Since each job dispatching decision will affect the system state in the future,we formulate the joint optimization of jobs dispatching at all the APs and all the scheduling time slots as an infinite-horizon Markov decision process(MDP).The minimization objective is a discounted measurement of the average processing time per job,including the uploading delay,the waiting time and the computation time at the edge servers.In this problem,the approximate MDP should be adopted to address the curse of dimensionality.Conventional low-complexity approximate solution of MDP is usually hard to predict the performance analytically.In this paper,a novel approximate MDP solution framework is proposed via one-step policy iteration over a baseline policy,where the analytical performance bound can be obtained.Moreover,since the expression of the approximate value function is derived,the value iteration in conventional methods can be eliminated,which can essentially reduce the computation complexity.It is shown by simulations that the proposed low-complexity algorithm has significantly better performance than various benchmark schemes. 展开更多
关键词 edgecomputing Markovdecisionprocess(MDP) approximateMDP jobsdispatching
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈