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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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    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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[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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History
  • Received:January 23,2019
  • Revised:February 26,2019
  • Adopted:April 10,2019
  • Online: July 09,2020
  • Published: