Hot deformation and dynamic recrystallization behavior of a powder metallurgy Ti-45Al-6Nb-0.3W alloy

Material Design & Processing Communications Pub Date : 2021-04-09 DOI:10.1002/mdp2.224

Dongye Yang, Na Liu, Xu Gu, Pan Ma, Guoqing Zhang, Jianfei Sun

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引用次数: 1

Abstract

The flow behaviors of powder metallurgy (PM) Ti-45Al-6Nb-0.3W (at.%) alloy were systematically investigated in the temperature range from1050 to 1200°Cand the strain rates from 0.001 to 0.5 s⁻¹. The effects of the temperature and the strain rate on deformation behaviors were represented by Zener–Hollomon parameter in an exponent-type equation. Microstructural observations revealed that α₂/γ lamellar colonies varied into particle α₂ due to dynamic recrystallization (DRX) at high temperature during the compression. The result indicated that the strain-dependent constitutive equation could lead to a good agreement between the calculated and measured flow stresses in the elevated temperature range for the PM Ti-45Al-6Nb-0.3W alloy. Subsequently, the correlation coefficient (R) and the average absolute relative error (AARE) were introduced to verify the validity of the constitutive equation, and values of R and AARE were 0.99483 and 3.956%, respectively.

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粉末冶金Ti-45Al-6Nb-0.3W合金热变形及动态再结晶行为

系统研究了粉末冶金Ti-45Al-6Nb-0.3W (at.%)合金在1050 ~ 1200℃、应变速率0.001 ~ 0.5 s−1范围内的流动行为。温度和应变速率对变形行为的影响用指数型方程的Zener-Hollomon参数表示。显微组织观察表明，α2/γ片层集落在高温下动态再结晶(DRX)作用下转变为α2颗粒。结果表明，应变相关的本构方程可以使PM Ti-45Al-6Nb-0.3W合金在高温范围内的流动应力计算值与实测值吻合较好。随后引入相关系数(R)和平均绝对相对误差(AARE)验证本构方程的有效性，R和AARE分别为0.99483和3.956%。

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来源期刊

Material Design & Processing Communications

CiteScore

5.30

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0.00%

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