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Microstructure characterization and tensile properties of a Ni-containing TiAl-based alloy with heat treatment 认领 引用 被引量：14
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作者 Jian-Chao Han Shu-Long Xiao +5 位作者 Jing Tian Yu-Yong Chen Li-Juan Xu Xiao-Peng Wang Yi Jia Shou-Zhen Cao 《Rare Metals》 SCIE EI CAS CSCD 2016年第1期26-34,共9页
The effects of Ni addition on solidification micro structure and tensile properties of Ti-48Al-2Cr-2Nb alloy were investigated using differential scanning calorimetry（DSC）,X-ray diffraction（XRD）,scanning electron ... The effects of Ni addition on solidification micro structure and tensile properties of Ti-48Al-2Cr-2Nb alloy were investigated using differential scanning calorimetry（DSC）,X-ray diffraction（XRD）,scanning electron microscopy（SEM） equipped with energy-dispersive spectroscope（EDS） and transmission electron microscopy（TEM）.Results show that with 3 at%Ni addition,the as-cast micro structure is mainly composed of fine lamellar colonies（~50 μm）,γ grains and Ni-ridied τ_3 phase.After heat treatment at 1380℃,the Ni-containing alloy is characterized by fine fully lamellar micro structure（~90 μm）.The heat-treated Ni-containing specimen exhibits superior room temperature tensile properties than other specimens.The tensile properties are discussed in light of the microstructure evolution and role of Ni-riched τ_3 phase. 展开更多
关键词 TiAl-based intermetallics Solidificationmicrostructure Heat treatment Phase transformation Tensile properties
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Microstructure and mechanical properties of TiAl-based alloy prepared by double mechanical milling and spark plasma sintering 认领 引用 被引量：7
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作者 肖树龙 徐丽娟 +1 位作者 陈玉勇 于宏宝 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第5期1086-1091,共6页
A fine-grained TiAl alloy with a composition of Ti-45Al-2Cr-2Nb-1B-0.5Ta-0.225Y （mole fraction, %） was prepared by double mechanical milling（DMM） and spark plasma sintering（SPS）. The relationship among sintering... A fine-grained TiAl alloy with a composition of Ti-45Al-2Cr-2Nb-1B-0.5Ta-0.225Y （mole fraction, %） was prepared by double mechanical milling（DMM） and spark plasma sintering（SPS）. The relationship among sintering temperature, microstructure and mechanical properties was studied. The results show that the morphology of double mechanical milled powder is regular with size in the range of 20-40 μm and mainly composed of TiAl and Ti3Al phases. The main phase TiAl and few phases Ti3Al, Ti2Al and TiB2 were observed in the SPSed alloys. For samples sintered at 900 ℃ the equiaxed crystal grain microstructure is achieved with size in the range of 100-200 nm. With increasing the SPS temperature from 900 ℃to 1000 ℃ the size of equiaxed crystal grain obviously increases, the microhardness decreases from HV658 to HV616, and the bending strength decreases from 781 MPa to 652 MPa. In the meantime, the compression fracture strength also decreases from 2769 MPa to 2669 MPa, and the strain to fracture in compression increases from 11.69% to 17.76%. On the base of analysis of fractographies, it shows that the compression fracture transform of the SPSed alloys is intergranular rupture. 展开更多
关键词 TiAl-based alloys mechanical alloying spark plasma sintering microstructure mechanical properties
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Microstructure and Phase Transformation of a Niobium-rich TiAl-based Alloy Containing Boron and Carbon 认领 引用 被引量：3
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作者 Ziyong Chen Xianglin Su +1 位作者 Zhilei Xiang Zuoren Nie 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2012年第5期453-460,共8页
Microstructure and phase transformation of Ti46Al8Nb0.5B0.2C alloy have been investigated.X-ray diffraction （XRD）,optical microscopy （OM）,scanning electron microscopy （SEM） and transmission electron microscopy ... Microstructure and phase transformation of Ti46Al8Nb0.5B0.2C alloy have been investigated.X-ray diffraction （XRD）,optical microscopy （OM）,scanning electron microscopy （SEM） and transmission electron microscopy （TEM） results show that as-cast and hot isostatic pressing （HIP） alloy mainly composed of γ and α 2 phase have fully lamellar microstructure with point-like or ribbon-like TiB 2 distributing in lamellar colony or at grain boundary.The mean size of lamellar colony is about 150 and 450 μm for as-cast and HIP alloy,respectively.The lamellar spacing is about 550 and 600 nm for as-cast and HIP alloy,respectively.It has been found that cooling rates and quenching temperatures have significant effect on phase transformation of Ti46Al8Nb0.5B0.2C alloy.When the alloy is treated at 1380℃ for 1 h and cooled from α domain,water cooling leads to complete α → α 2 transformation,oil cooling leads to predominant α → α 2 and part α → γ m transformation,air cooling leads to α → α ＋ γ p2 →L（α ＋ γ） →L（α 2 ＋ γ） transformation,and furnace cooling leads to α → α ＋ γ p3 →L（α ＋ γ） →L（α 2 ＋ γ） transformation.However,when the alloy is treated at 1400℃ for 1 h and cooled from α domain,water cooling leads to predominant α → α 2 and part α → α ＋ γ p4 → γ m transformation,oil cooling leads to α → α ＋ γ p5 → γ m transformation,air cooling leads to α → α ＋ γ p6 →L（α ＋ γ） →L（α 2 ＋ γ） transformation,and furnace cooling leads to α → α ＋ γ p7 →L（α ＋ γ） →L（α 2 ＋ γ） transformation.Microstructural evolution of the alloy during various heat treatments has been examined and the phase transformation mechanisms have been elucidated.Based on the experimental observation,schematic CCT diagrams for the alloy have been given. 展开更多
关键词 TiAl-based alloys Heat treatment Microstructure Phase transformation
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INVESTIGATION OF MULTI-STEP THERMO-MECHANICALTREATMENT OF CAN-FORGED TiAl-BASED ALLOY 认领 引用 被引量：7
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作者 Y.H. He B. Y. Huang Y. Liu and Y.X. Liu 《Acta Metallurgica Sinica(English Letters)》 EI CAS 1997年第4期369-374,共6页
The effects of a new technology, multi-step thermo-mechanical treatment, on the microstructure, deformation substructure and mechanical properties at ambient and elevated tempemture of can-forged Ti-33 Al-3 Cr-0.5Mo (... The effects of a new technology, multi-step thermo-mechanical treatment, on the microstructure, deformation substructure and mechanical properties at ambient and elevated tempemture of can-forged Ti-33 Al-3 Cr-0.5Mo (wt%) Alloy were investigated.The results show that, after multi-step thermo-mechanical treatment of can-forged specimens, homogeneous, fine microstructures can be obtained in the whole TiAl-based alloy specimens. Furthermore, the specimen with homogeneous and fine full lamellae microstructure demonstrutes excellent comprehensive mechanical properties at ambient and elevated temperature. 展开更多
关键词 TiAl-based alloy mechanical property heat treatment
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FORMATION OF SILICONIZED LAYER ON TiAl-BASED ALLOY AND THE OXIDATION RESISTANCE 认领 引用 被引量：2
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作者 W.Liang X.X.Ma +2 位作者 X.G.Zhao J.Zhang D.X.Zou 《Acta Metallurgica Sinica(English Letters)》 EI CAS 2003年第6期466-472,共7页
The Ti-48Al alloy was pack siliconized with 15%Si+85%Al2O3. The microstructure of the siliconized coating on the TiAl-based alloy was analyzed and its effect on oxidation resistance was investigated. The specimens bef... The Ti-48Al alloy was pack siliconized with 15%Si+85%Al2O3. The microstructure of the siliconized coating on the TiAl-based alloy was analyzed and its effect on oxidation resistance was investigated. The specimens before and after cycle oxidation were examined by XRD and SEM equipped with XEDS. The results showed that the coating is composed of a thin Al2O3 outer layer and a composite inner layer of Ti5Si3 with an appropriate amount of Al2O3 dispersed in. Cycle oxidation tests showed that the high temperature oxidation resistance of TiAl-based alloy was greatly improved by forming such composite coating. No spaliation and crack happened and the weight gain was very small after cycle oxidation at 900℃ for 314h. 展开更多
关键词 TiAl-based alloy microstructure composite coating high tem-perature oxidation
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Effect of cooling rate on the microstructure of electron beam welded joints of two-phase TiAl-based alloy 认领 引用 被引量：1
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作者 陈国庆 张秉刚 +1 位作者 何景山 冯吉才 《China Welding》 EI CAS 2007年第2期11-15,共5页
The analysis of the microstructural characterization and phase composition of electron beam welded joint zones of Ti- 43Al-9V-O. 3Y alloy has been done in this study. The welded seam is mainly composed of B2 phase, th... The analysis of the microstructural characterization and phase composition of electron beam welded joint zones of Ti- 43Al-9V-O. 3Y alloy has been done in this study. The welded seam is mainly composed of B2 phase, the partial γ ＋ α2 twophase lamellar structure and granular γm phase. And the lanthanon Y existed as YAl2 phase and served as grain refined. The impact of different cooling rates on joint microstructure, fracture characteristic and tensile strength were investigated. The high cooling rate restrained the structural transformation and resulted in the ordering structure. The fracture of the joint was brittle cleavage fracture because the ordering structure went against restraining the crack propagation. With the decrease of cooling rate, the transformation amounts of lamellar structure increased, and the fracture presented the layered and crosslayered characteristic. 展开更多
关键词 TiAl-based alloy electron beam welding cooling rate structure
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Processing TiAl-Based Alloy by Elemental Powder Metallurgy 认领 引用 被引量：3
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作者 Yong LIU, Baiyun HUANG, Yuehui HE and Kechao ZHOU 《Journal of Materials Science & Technology》 SCIE EI CAS 2000年第6期605-610,共6页
TiAI-based alloys with various compositions (including Ti-48Al, Ti-47Al-2Cr-2Nb, Ti-47Al-2Cr-2Nb-0.2B and Ti-47Al-3Cr, in mole fraction) had been prepared by elemental powder metallurgy (EPM). The results have shown t... TiAI-based alloys with various compositions (including Ti-48Al, Ti-47Al-2Cr-2Nb, Ti-47Al-2Cr-2Nb-0.2B and Ti-47Al-3Cr, in mole fraction) had been prepared by elemental powder metallurgy (EPM). The results have shown that the density of the prepared Ti-48AI alloy increases with increasing hot pressing temperature up to 1300℃. The Ti-48AI alloy microstructure mainly consisted of island-like Ti3Al phase and TiAl matrix at hot pressing temperature below 1300℃, however, coarse α2/γ lamellar colonies and γ grains appeared at 1400℃. It has also indicated that the additions of elemental Cr and B can refine the alloy microstructure. The main microstructural inhomogeneity in EPM TiAI-based alloys was the island-like α2 phase or the aggregate of α2/γ lamellar colony, and such island-like structure will be inherited during subsequent heat treatment in (α＋γ) field. Only after heat treatment in a field would this structure be eliminated. The mechanical properties of EPM TiAl-based alloys with various compositions were tested, and the effect of alloy elements on the mechanical properties was closely related to that of alloy elements on the alloy microstructures. Based on the above results, TiAI-based alloy exhaust valves were fabricated by elemental powder metallurgy and diffusion joining. The automobile engine test had demonstrated that the performance of the manufactured valves was very promising for engine service. 展开更多
关键词 TiAl Processing TiAl-Based Alloy by Elemental Powder Metallurgy
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Mechanism and Kinetics of Phase Transformation in Two-phase TiAl-based Alloys 认领 引用 被引量：3
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作者 Shiming HAO+ and Wen tao WUChuanxi HAN 《Journal of Materials Science & Technology》 SCIE EI CAS 1994年第3期170-174,共5页
The aged and quenched microstructures of both alloys, Ti-42at-%Al and Ti-45at -%Al,homogenized in the disordered single phase field. were investigated And the results show that the quinched microstructure is a supersa... The aged and quenched microstructures of both alloys, Ti-42at-%Al and Ti-45at -%Al,homogenized in the disordered single phase field. were investigated And the results show that the quinched microstructure is a supersaturated single phase of ordered 22. When the supersaturated phase is aged in the two phase range at 1273 and 1373 K, it will transform to a lamellar microstructure of γ+α2. with a discontinuous decomposition mechanism in Ti-42at-%Al alloy and a semicontinuous decomposition mechanism in T1-45at-%Al alloy. With the methods of quantitative metallograph examination and X-ray diffraction analysis. the relationship between the amount of γ, phase precipitation and the time of isothermal transformation is agreed 展开更多
关键词 TiAl Mechanism and Kinetics of Phase Transformation in Two-phase TiAl-based Alloys
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Effect of Cr on microstructure and oxidation behavior of TiAl-based alloy with high Nb 认领 引用 被引量：5
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作者 Zhu-Hang Jiang Cheng-Zhi Zhao +2 位作者 Jiao-Jiao Yu He-Xin Zhang Zhi-Ming Li 《China Foundry》 SCIE CAS 2018年第1期17-22,共6页
Three novel multi-microalloying TiAl-based alloys containing high Nb were designed and fabricated Thermogravimetric method was applied to investigate the influence of Cr on the oxidation behavior of high Nb TiAl alloy... Three novel multi-microalloying TiAl-based alloys containing high Nb were designed and fabricated Thermogravimetric method was applied to investigate the influence of Cr on the oxidation behavior of high Nb TiAl alloy at 1,073 K for 200 h in laboratory air. The 2 at.% and 4 at.% Cr were added into the alloy,(respectivel named 2 Cr and 4 Cr compared to the Cr-free ternary alloy, 0 Cr alloy). The alloys' microstructure and compositio as well as the composition distribution of the oxidation scale were analyzed by means of Scanning Electro Microscopy(SEM), Energy Dispersive Spectroscopy(EDS), and X-Ray Diffractometry(XRD). The results show that the addition of Cr decreases the grain size of the Nb-TiAl alloy and leads to a transformation from a full lamellar structure to a nearly fully lamellar structure. When oxidized at 1,073 K for 200 h, the oxidized mass gai of the alloy increases with an increase in Cr addition amount in the first 100 h and decreases in the last 100 h With the increase of Cr content, the oxidation surface turns compact but uneven in morphology, which may affec the oxidation resistance of the alloy by increasing the peeling off risk of the oxidation layer at friction conditions. 展开更多
关键词 TiAl-based alloys microstructure oxidation Cr addition
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Microstructure and fatigue properties of TiAl-based alloy with different tungsten contents 认领 引用 被引量：3
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作者 Zhen-Jun Yang Hong-Liang Sun +2 位作者 Ze-Wen Huang De-Gui Zhu Liang-Hui Wang 《Rare Metals》 SCIE EI CAS CSCD 2016年第1期113-117,共5页
Microstructure and fatigue properties of TiAlbased alloys with different W contents were investigated.The results indicate that the grain size and lamellar spacing can be significantly refined,and the optimal W conten... Microstructure and fatigue properties of TiAlbased alloys with different W contents were investigated.The results indicate that the grain size and lamellar spacing can be significantly refined,and the optimal W content on both the microstructure and fatigue property is about1.00 at%.The amount of B2（ω） phase gradually increases with the increase in W content,and excessive B2（ω） phase located in the boundary of lamellar colony trends to be the weak region with low resistance against crack propagation.Another result is that with the increase in W content,the region of peritectic reaction is also enlarged.The interdendritic Al-rich region is another weak region against crack propagation.Both of these effects are responsible for the worse fatigue property of Ti-45.1Al-5Nb-1.40W-1.4B W alloy compared with that of Ti-45.7Al-5Nb-0.75W-1.4B alloy.Instability of fatigue property still exists,but it slightly reduces with the decrease in grain size and lamellar spacing. 展开更多
关键词 TiAl-based alloy Tungsten Microstructure Fatigue Fracture
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Electron Beam-Physical Vapor Deposited TiAl-based Laminated Composite Sheet with Nb Layer Toughening 认领 引用
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作者 ZHANG De-ming CHEN Gui-qing HAN Jie-cai MENG Song-he 《Chinese Journal of Aeronautics》 EI CAS 2006年第B12期5-8,共4页
The TiAl-based laminated composite sheet of 150 mm × 100 mm × 0.2 mm, with 24 TiAl layers and 23 Nb layers laid alternately one on another, was successfully fabricated using the electron beam-physical vapor ... The TiAl-based laminated composite sheet of 150 mm × 100 mm × 0.2 mm, with 24 TiAl layers and 23 Nb layers laid alternately one on another, was successfully fabricated using the electron beam-physical vapor deposition （EB-PVD） method. The microstructure and properties of the sheet were investigated on an atomic force microscope （AFM）, a scanning electron microscope （SEM） and a tensile testing machine. The results indicate that the evenly distributed Nb layers are well joined with the TiAl layers, and the interfaces between layers are transparent, and every interlayer spacing is of about 8μm. The fractures appear to be a mixture of intergranular fractures and somewhat ductile quasi-cleavage ones. Despite its slight influence on ultimate tensile strength, the inserts of Nb layers efficiently increase the room temperature ductility of TiAl-based alloys due to the crack deflection effect. 展开更多
关键词 EB-PVD TiAl-based alloys sheet TiAl/Nb laminated composites microstructure and properties
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Dynamic physics-guided neural network for predicting hotdeformation behavior of TiAl-based intermetallic alloys 认领 引用
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作者 Hao Tian Yirui Hu +2 位作者 Zhiyi Ding Jianchao He Jie Xiong 《Materials Genome Engineering Advances》 CAS CSCD 2025年第4期28-38,共11页
Ti-Al-based intermetallic compounds are promising candidates for high-temperature structural applications owing to their outstanding mechanical prop-erties.Ti2AlNb alloys,characterized by complex multiphase microst... Ti-Al-based intermetallic compounds are promising candidates for high-temperature structural applications owing to their outstanding mechanical prop-erties.Ti2AlNb alloys,characterized by complex multiphase microstructures,present significant challenges for hot deformation modeling because of their atypical flow behavior and sensitivity to processing conditions.In this study,we systematically investigated the hot deformation behavior of Ti2AlNb through ex-periments and compared conventional constitutive models with advanced machine learning approaches.The conventional strain-compensated Sellars(SCS)model showed limited accuracy for Ti2AlNb,especially across complex microstructural transitions,while performing well for simpler alloy systems like Ti4822.To address these limitations,we developed a dynamic physics-guided neural network(DPGNN)that integrates physical constraints with data-driven learning via an adaptive gating mechanism.The DPGNN model significantly outperformed the SCS model and three purely data-driven baselines,achieving high accuracy(test R2>0.98)and robust generalization across both Ti2AlNb and Ti4822 alloys.These findings highlight the value of embedding physical principles within machine learning frameworks,providing a robust and generalizable too1 for predicting hot deformation behavior in advanced alloys. 展开更多
关键词 deformation behavior physics-guided neural network TiAINb TiAl-based intermetallic compound
Vacuum brazing of TiAl based alloy with Ti-Mn-Fe-Ni-Co-V system filler metal 认领 引用 被引量：2
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作者 Zhiliang Zhai Haishui Ren +2 位作者 Xinyu Ren Huaping Xiong Yaoyong Cheng 《China Welding》 CAS 2025年第2期85-96,共12页
Regarding the metallurgical considerations and the melting points of Ti-Mn-Fe eutectic alloy and Ni-Co-V ternary alloy,a Ti-Mn-Fe-Ni-Co-V senary system filler metal was proposed for joining TiAl-based alloy.The senary... Regarding the metallurgical considerations and the melting points of Ti-Mn-Fe eutectic alloy and Ni-Co-V ternary alloy,a Ti-Mn-Fe-Ni-Co-V senary system filler metal was proposed for joining TiAl-based alloy.The senary filler alloy consisted of TiFe,TiMn and Ti-based solid solution phases.It exhibited the liquidus temperatures of 1110.8℃and a contact angle of 37°on TiAl alloy after heating at 1110℃for 10 min.The brazed joint was composed of B2,γ-TiAl andα2-Ti3Al as well as residual brazing filler reaction phase.With increasing brazing temperature or prolonging dwell time,joint thickness andγ-TiAl phase volume fraction increased.The brazing condition of 1180℃/45 min gave theγ-TiAl phase content of 21.6 vol.%within the joint and the joint thickness of 270μm,and the maximum joint tensile strength reached 488 MPa at ambient temperature,with the joint strength coefficient of 82.7%.The joints offered tensile strength of 521 MPa at 700℃and 498 MPa at 800℃,corresponding to the joint strength coefficient of 85.1%and 96.3%,respectively.In this case,the joint fractured at the brazing seam with a flexural morphology,leading to the im-provement of joint strength.The typical composition within the joint was characterized by 0.47-2.09 at.%Fe,1.15-2.11 at.%Mn,0.08-0.59 at.%Ni,0.03-0.25 at.%Co and 0.15-0.35 at.%V,and these alloying elements had a positive strengthening effect on the brazed joint. 展开更多
关键词 Ti-Mn-Fe-Ni-Co-V system filler metal Medium-entropy alloy TiAl-based alloy Brazing γ-TiAl phase
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AN IN SITU STUDY ON DEFORMATION TWINNING NEAR CRACK TIP IN TWO-PHASE TiAl-BASE ALIOY 认领 引用
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作者 W Liang￣1,2), Q. Li￣2) and D.ZYang￣2) 《Acta Metallurgica Sinica(English Letters)》 EI CAS 1996年第4期272-278,共7页
An in situ study of twinning at crack tip in a TiAl-base alloy has been performed.The result shows that twinning with long shear vector(2/6) [112] can generate on(111) plane, even though usually it is very difficult t... An in situ study of twinning at crack tip in a TiAl-base alloy has been performed.The result shows that twinning with long shear vector(2/6) [112] can generate on(111) plane, even though usually it is very difficult to occur because of the high energy barrier. It was further shown that (1/6) [112](111) twinning is considerably easier to generate. Furthermore,(1/2)<110) ordinary dislocations were very active and dominated nearly the whole plastic zone, in spite of low Schmid factors. On the other hand, however <101) and (1/2) <112] superdislocations with higher Schmid factors can hardly be observed. 展开更多
关键词 TiAl-base alloy deformation twinning,crack propagation
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Tuning mechanical properties for β(B2)-containing TiAl intermetallics 认领 引用 被引量：10
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作者 邱从章 刘咏 +4 位作者 黄岚 刘彬 张伟 贺跃辉 黄伯云 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第11期2593-2603,共11页
Based on the analyses of the microstructures and phase diagrams of the TiAl-based alloy, the relationship among the composition, structure and mechanical properties of the B2-containing y-TiAI alloys was reviewed. The... Based on the analyses of the microstructures and phase diagrams of the TiAl-based alloy, the relationship among the composition, structure and mechanical properties of the B2-containing y-TiAI alloys was reviewed. The refinement of microstructures and improvement of mechanical properties of TiA1 alloy through stabilization of the β/B2 phase were reviewed. The mechanism of the superplastic behavior of the B2-containing y-TiAI alloys was discussed. With a reasonable addition of β-stabilizer, metastable B2 phase can be maintained, which is favorable for fine-grained structure and better high-temperature deformation behaviors. The mechanical properties of the B2-containing TiAI alloy, including the deformability and elevated temperature properties, can also be improved with doping elements and subsequent hot-working processes. The above mentioned researches discuss a new way for developing TiAI alloys with comprehensive properties, including good deformability and creep resistance. 展开更多
关键词 β-stabilizing elements B2 phase TiAl-based alloys phase diagram grain refinement thermal processing superplasticdeformation
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Lamellar orientation control in directionally solidified TiAl intermetallics 认领 引用 被引量：8
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作者 Su Yanqing Liu Tong +4 位作者 Li Xinzhong Chen Ruirun Ding Hongsheng Guo Jingjie Fu Hengzhi 《China Foundry》 SCIE CAS 2014年第4期219-231,共13页
TiAl-based alloys are potentially used as high-temperature structural materials with a high specific strength in the range of^900°C.However,the mechanical properties of TiAl-based alloys are extremely anisotropic... TiAl-based alloys are potentially used as high-temperature structural materials with a high specific strength in the range of^900°C.However,the mechanical properties of TiAl-based alloys are extremely anisotropic with respect to the lamellar orientation of the microstructures.A balance combination of room-temperature ductility and strength can be achieved when the lamellar orientation are aligned parallel to the tensile stress direction.Lamellar orientation control of TiAl-based alloys by directional solidification technique has been widely studied in recent years.Two different directional solidification processes can be used to modify the lamellar orientation.One is a seeding technique and the other is adjusting the solidification path.This paper reviews the principles of the two methods and their progress.The influence of alloy composition and solidification parameters on lamellar orientation control is also discussed. 展开更多
关键词 TiAl-based alloys directional solidification crystal growth lamellar orientation
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Effect of thermal stabilization on microstructure and mechanical property of directionally solidified Ti-46Al-0.5W-0.5Si alloy 认领 引用 被引量：5
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作者 樊江磊 李新中 +3 位作者 苏彦庆 陈瑞润 郭景杰 傅恒志 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第5期1073-1080,共8页
Effect of thermal stabilization on the microstructure and mechanical property of directionally solidified Ti-46Al-0.5W-0.5Si （mole fraction, %） alloy was investigated. The specimens were thermal stabilized for diffe... Effect of thermal stabilization on the microstructure and mechanical property of directionally solidified Ti-46Al-0.5W-0.5Si （mole fraction, %） alloy was investigated. The specimens were thermal stabilized for different time （t） and directionally solidified at a constant growth rate of 30 μm/s and temperature gradient of 20 K/mm. Dependencies of the primary dendritic spacing （λ1）, secondary dendritic spacing （λ2）, interlamellar spacing （λL） and microhardness （HV） on holding time were determined. The values of the λ1, λ2 and λL increase with the increase of t, and the value of HV decreases with the increase of t. The increase of t is helpful to obtain a good directional solidification structure. However, it reduces the mechanical property of the directionally solidified TiAl alloy. The optimized value of t is about 30 min. 展开更多
关键词 intermetallics TiAl-based alloy crystal growth microstructure evolution mechanical properties
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Processing map and hot deformation behavior of Ta-particle reinforced TiAl composite 认领 引用 被引量：10
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作者 Cheng-hao YUAN Bin LIU +1 位作者 Yu-xi LIU Yong LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第3期657-667,共11页
The hot deformation behavior of a Ta-particle reinforced TiAl composite was studied.Ti-48Al-2Cr-2Nb-0.2 W(at.%)/20 vol.%Ta metal matrix composite was fabricated by spark plasma sintering.The deformation behavior was i... The hot deformation behavior of a Ta-particle reinforced TiAl composite was studied.Ti-48Al-2Cr-2Nb-0.2 W(at.%)/20 vol.%Ta metal matrix composite was fabricated by spark plasma sintering.The deformation behavior was investigated by hot compression tests at the temperature ranging from 1050 to 1200℃ and the strain rate ranging from 1×10-3 to 1 s-1.The constitutive equation containing true strain variables was established.The values of activation energy Q under different strain degrees are between 240 and 280 kJ/mol,which are lower than that of pure TiAl.Based on dynamic material modeling,the processing maps at various strain degrees were established,and the optimized parameters for hot working are 1050-1100℃ and 0.005-0.01 s-1.The microstructural evolution during deformation was characterized,which indicated that the dynamic recrystallization plays an important role in this process. 展开更多
关键词 TiAl-based composite flow behavior processing map dynamics recrystallization
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Diffusion behavior of Nb element in high Nb containing TiAl Alloys by reactive hot pressing 认领 引用 被引量：5
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作者 WANG Yanhang LIN Junpin +2 位作者 HE Yuehui WANG Yanli CHEN Guoliang 《Rare Metals》 SCIE EI CAS 2006年第4期349-354,共6页
Diffusion behavior of Nb in elemental powder metallurgy high Nb containing TiAl alloys was investigated. The results show that Nb element dissolves into the matrix by diffusion. Pore nests are formed in situ after Nb ... Diffusion behavior of Nb in elemental powder metallurgy high Nb containing TiAl alloys was investigated. The results show that Nb element dissolves into the matrix by diffusion. Pore nests are formed in situ after Nb diffusion. With the increase in hot pressing temperature, the diffusion of Nb will be more sufficient, and the microstructure is more homogeneous. Nb element diffuses completely at 1400℃. Meanwhile, compression deformation and agglomeration phenomena of pores are observed in some pore nests. Hot isostatic pressing （HIP） treatment can only efficiently decrease but not eliminate porosity completely. 展开更多
关键词 powder metallurgy TiAl-based alloy hot pressing diffusion hot isostatic pressing
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Homogenization treatment of high Nb containing TiAl alloys with as-cast and as-forged microstructures 认领 引用 被引量：5
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作者 XU Zhengfang XU Xiangjun +4 位作者 LIN Junpin ZHANG Yong WANG Yanli LIN Zhi CHEN Guoliang 《Rare Metals》 SCIE EI CAS 2008年第2期181-186,共6页
The effect of heat treatment on the microstructure evolution of a high Nb containing TiAl alloy has been studied.The results indicate thatβ-segregation,β-segregation and S-segregation in the as-cast and as-forged al... The effect of heat treatment on the microstructure evolution of a high Nb containing TiAl alloy has been studied.The results indicate thatβ-segregation,β-segregation and S-segregation in the as-cast and as-forged alloys can be effectively eliminated at the temperature above Tα(1350-1400℃)for long holding time(12-24 h)and the full lamellar(FL)microstructure is gained.For the two alloys,the lamellar colony sizes are 120μm and 2000μm,respectively after heat treatment at 1400℃for 12 h.Meanwhile,the sizes are 210μm and 3000μm,respectively at 1350℃for 24 h.To get a fine homogenous microstructure,the primary as-cast alloy is first subjected to preheat treatment for eliminating the segregations.After the preheat treatment,the ailoy is processed by the multi-step canned forging to attain the microstructure with fine grain size. 展开更多
关键词 TiAl-based alloy Nb-containing FL microstructure heat treatment rnicrosegregation
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