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Ti2AlNb板材的热拉伸行为和微观组织演化机理
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1.南京航空航天大学;2.哈尔滨工业大学

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基金项目:

国家青年科学基金


Hot tensile behavior and microstructure evolution mechanism of Ti2AlNb sheet
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Harbin Institute of Technology

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National Science Foundation for Young Scientists of China

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    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。

    Abstract:

    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.

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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.]
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  • 收稿日期:2019-01-23
  • 最后修改日期:2019-02-26
  • 录用日期:2019-04-10
  • 在线发布日期: 2020-07-09
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