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李萍.Ti-22Al-26Nb合金热变形本构方程建立及软化行为研究[J].稀有金属材料与工程(英文),2018,47(12):3811~3815.[LI PING.Establishment of Constitutive Equation and Research on Softening Behavior of Ti-22Al-26Nb Alloy during Hot Deformation[J].Rare Metal Materials and Engineering,2018,47(12):3811~3815.]
Establishment of Constitutive Equation and Research on Softening Behavior of Ti-22Al-26Nb Alloy during Hot Deformation
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Received:March 31, 2017  Revised:May 08, 2017
DOI:
Key words: Ti-22Al-26Nb alloy  constitutive model  discontinuous yield  recrystallization behavior
Foundation item:国家自然科学基金项目(项目号51175137)
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LI PING  
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Abstract:
      As the most promising aerospace high temperature structural materials, Ti2AlNb alloys have high specific strength and good high temperature creep properties. The high temperature mechanical behavior and recrystallization behavior of Ti-22Al-26Nb alloy were studied. A high temperature constitutive model of the alloy was established .The dynamic recrystallization multi-stress peak curve was analyzed by fitting the experimental results. The results show that it is feasible to establish the high temperature constitutive model of Ti-22Al-26Nb alloy based on the hyperbolic sine function, which can describe the high nonlinearity of the thermodynamic parameters of Ti-22Al-26Nb alloy at high temperature complex relationship, the maximum error is 2.6%. From the modified Avrami equation, it is predicted that the recrystallization volume fraction and the strain show a recrystallization kinetics growth trend, and the complex softening behavior of the alloy during high temperature deformation is revealed.