武永,王东君,范荣磊,刘志强,刘钢.Ti2AlNb板材的热拉伸行为和微观组织演化机理[J].稀有金属材料与工程,2020,49(6):1825~1833.[Wu Yong,Wang Dongjun,Fan Ronglei,Liu Zhiqiang,Liu Gang.Hot tensile behavior and microstructure evolution mechanism of Ti2AlNb sheet[J].Rare Metal Materials and Engineering,2020,49(6):1825~1833.]
Ti2AlNb板材的热拉伸行为和微观组织演化机理
投稿时间:2019-01-23  修订日期:2019-02-26
中文关键词:  Ti2AlNb合金  高温拉伸  组织演变  Arrhenius方程
基金项目:国家青年科学基金
中文摘要:
      本文通过高温拉伸试验研究了Ti-22Al-24.5Nb-0.5Mo合金在温度范围为910~1040℃、应变速率为0.0001~0.1-1条件下的高温变形行为。建立了B2/β+O、α2+B2/β+O和α2+B2/β三个不同相区的Arrhenius方程,并通过多种微观组织观察技术研究了微观组织演化机理。结果表明:在B2/β+O、α2+B2/β+O和α2+B2/β三个相区的激活能分别为759.43kJ/mol,516.71kJ/mol和438.59kJ/mol。微观组织演化主要是O相晶粒的动态再结晶和B2/β相晶粒的动态回复,在B2/β+O相区的软化机制是片层O相晶粒的球化,而在α2+B2/β+O相区的软化机制是B2/β相晶粒的动态再结晶及局部剪切带的形成。
Hot tensile behavior and microstructure evolution mechanism of Ti2AlNb sheet
英文关键词:Ti2AlNb alloy  Hot tensile test  Microstructure evolution  Arrhenius equation
英文摘要:
      The hot tensile behavior of Ti-22Al-24.5Nb-0.5Mo (at.%) alloy was investigated by the hot tensile tests at the temperature 910-1040°C and the strain rate 0.0001s-1-0.1s-1. The Arrhenius equations were calculated at the three different phase fields and the microstructure evolution mechanisms were studied by microstructure observation. The results show that the activated energies were 759.43kJ/mol, 516.71kJ/mol and 438.59kJ/mol at B2/β+O, α2+B2/β+O and α2+B2/β phase fields, respectively. The microstructure evolution were dominated by dynamic recrystallization of O-phase and dynamic recovery of B2/β phase grains, and the softening mechanism was the globularization of O lamellar grains at B2/β+O phase field, while the softening mechanism was dynamic recrystallization and shear bands of the B2/β-phase grains α2+ B2/β+O.
作者单位E-mail
武永 南京航空航天大学 wuyong@nuaa.edu.cn 
王东君 哈尔滨工业大学  
范荣磊 南京航空航天大学  
刘志强 哈尔滨工业大学  
刘钢 哈尔滨工业大学 gliu@hit.edu.cn 
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