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Ti2AlNb板材的熱拉伸行為和微觀組織演化機(jī)理
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1.南京航空航天大學(xué);2.哈爾濱工業(yè)大學(xué)

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國家青年科學(xué)基金


Hot tensile behavior and microstructure evolution mechanism of Ti2AlNb sheet
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Affiliation:

Harbin Institute of Technology

Fund Project:

National Science Foundation for Young Scientists of China

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    摘要:

    本文通過高溫拉伸試驗(yàn)研究了Ti-22Al-24.5Nb-0.5Mo合金在溫度范圍為910~1040℃、應(yīng)變速率為0.0001~0.1-1條件下的高溫變形行為。建立了B2/β+O、α2+B2/β+O和α2+B2/β三個不同相區(qū)的Arrhenius方程，并通過多種微觀組織觀察技術(shù)研究了微觀組織演化機(jī)理。結(jié)果表明：在B2/β+O、α2+B2/β+O和α2+B2/β三個相區(qū)的激活能分別為759.43kJ/mol，516.71kJ/mol和438.59kJ/mol。微觀組織演化主要是O相晶粒的動態(tài)再結(jié)晶和B2/β相晶粒的動態(tài)回復(fù)，在B2/β+O相區(qū)的軟化機(jī)制是片層O相晶粒的球化，而在α2+B2/β+O相區(qū)的軟化機(jī)制是B2/β相晶粒的動態(tài)再結(jié)晶及局部剪切帶的形成。

    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,王東君,范榮磊,劉志強(qiáng),劉鋼. Ti2AlNb板材的熱拉伸行為和微觀組織演化機(jī)理[J].稀有金屬材料與工程,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.]
DOI：10.12442/j. issn.1002-185X.20190088

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  • 收稿日期:2019-01-23
  • 最后修改日期:2019-02-26
  • 錄用日期:2019-04-10
  • 在線發(fā)布日期: 2020-07-09
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