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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(英文),2020,49(6):1825~1833.[Wu Yong,Wang Dongjun,Fan Ronglei,Liu Zhiqiang and Liu Gang.Hot tensile behavior and microstructure evolution mechanism of Ti2AlNb sheet[J].Rare Metal Materials and Engineering,2020,49(6):1825~1833.]
Hot tensile behavior and microstructure evolution mechanism of Ti2AlNb sheet
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Received:January 23, 2019  Revised:February 26, 2019
DOI:
Key words: Ti2AlNb alloy  Hot tensile test  Microstructure evolution  Arrhenius equation
Foundation item:国家青年科学基金
Author NameAffiliation
Wu Yong,Wang Dongjun,Fan Ronglei,Liu Zhiqiang and Liu Gang  
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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.