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陈维,吕亚平,张晓泳,陈超,周科朝.针状Ti-55511合金热变形及后续退火过程中组织演变及其力学性能研究[J].稀有金属材料与工程(英文),2020,49(3):897~900.[陈维,Lv Yaping,zhangxiaoyong,chenchao and zhoukechao.Chen Wei1,Lv Yaping2,Zhang Xiaoyong1*,Chen Chao1,Zhou Kechao1[J].Rare Metal Materials and Engineering,2020,49(3):897~900.]
Chen Wei1,Lv Yaping2,Zhang Xiaoyong1*,Chen Chao1,Zhou Kechao1
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Received:January 30, 2019  Revised:July 12, 2019
DOI:
Key words: Lamellar near-beta Ti alloy  microstructure evolution  mechanical properties  twin variant  stacking fault
Foundation item:国家重点研发项目(No. 2018YFB0704100),国家自然科学基金(NO. 51871242)
Author NameAffiliation
陈维,Lv Yaping,zhangxiaoyong,chenchao and zhoukechao  
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Abstract:
      Lamellar Ti–55511 near-beta Ti alloy was conducted on 750°C hot rolling and subsequent 600°C annealing to investigate the microstructure evolution and mechanical properties. The Burgers orientation relationship between α and β phase is broken down owing to dynamic recrystallization (DRX) of lamellar α phase during hot deformation, forming fine and equiaxed α plates, which leads to the increasing tensile strength and elongation. During annealing, secondary α grains are precipitated from β matrix, resulting in higher strength but lower elongation. Meanwhile, further spheroidization and growth of α phase via static recrystallization (SRX) happen during annealing. The recrystallization of β phase only happens in subsequent annealing rather than hot rolling. At the beginning of the deformation, two twin variants can be found in lamellar α phase. With an increase in deformation, three twin variants are formed in α phase. The nano-scaled twins and stacking fault was formed resulting from twins decomposing during annealing.