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张金虎,徐东生,滕春禹,王皞,李学雄,孙佳,杨锐.剪切应力对Ti-6Al-4V合金α相形核及微织构形成的影响[J].稀有金属材料与工程(英文),2020,49(3):939~943.[Zhang Jinhu,Xu Dongsheng,Teng Chunyu,Wang Hao,Li Xuexiong,Sun Jia and Yang Rui.The influences of applied shear stress on nucleation and micro-texture formation of α phase in Ti-6Al-4V[J].Rare Metal Materials and Engineering,2020,49(3):939~943.]
The influences of applied shear stress on nucleation and micro-texture formation of α phase in Ti-6Al-4V
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Received:January 10, 2019  Revised:July 12, 2019
DOI:
Key words: Applied shear stress, Micro-texture, Phase field simulation
Foundation item:国家重点研发计划“材料基因工程关键技术与支撑平台”专项(2016YFB0701304);中国科学院战略先导科技专项项目(XDC01040100);中国科学院信息化专项项目(XXH13506-304);辽宁省博士启动基金(20180540133)
Author NameAffiliation
Zhang Jinhu,Xu Dongsheng,Teng Chunyu,Wang Hao,Li Xuexiong,Sun Jia and Yang Rui  
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Abstract:
      To investigate the influences of applied shear stress on the nucleation process and micro-texture formation of α precipitates, β→α transformation in Ti-6Al-4V alloy was simulated by phase field method using Pandat software and JmatPro (TTT-Ti) databases as direct input in the model. The effects of applied positive and negative shear stresses (10, 30 and 50 MPa) along (101)[-111]β or (12-1)[-111]β on the microstructure evolution of Ti-6Al-4V alloy were explored under aging at certain temperature. The results show that. with the increase of shear stress, the elastic interaction between applied stress and α variants gradually plays more significant role in determining the microstructure of the system under certain undercooling, t herefore, the selection of α variants is gradually enhanced. It was found that the shear stress has a stronger effect on the variant selection than that of normal stress, therefore maybe more effective on microtexture formation. With the increase of shear stress, two or one type of variant are selected under positive shear, and one type of variant is favored by the negative shear along (101)[-111]β or (12-1)[-111]β respectively.