析出硬化AA7022-T6铝合金高温流变行为的本构模型

来源期刊:中国有色金属学报(英文版)2020年第11期

论文作者:H. R. REZAEI ASHTIANI P. SHAHSAVARI

文章页码:2927 - 2940

关键词:流变行为;本构模型;Arrhenius模型;动态再结晶;AA7022-T6 铝合金

Key words:flow behavior; constitutive models; Arrhenius model; dynamic recrystallization; AA7022-T6 aluminum alloy

摘    要:在温度623~773 K和应变速率0.01~1 s-1条件下,采用等温压缩试验研究析出硬化AA7022-T6 铝合金的热力学行为。结果表明,动态再结晶是主要的热变形机制,特别是在高温和低应变速率下。采用改进的Johnson- Cook (J-C)模型和应变补偿Arrhenius模型预测不同变形条件下的热流变行为。这两种模型的线性相关系数分别为0.9914和0.9972,平均相对误差(ARE)分别为6.074%和4.465%,均方根误差(RMSE)分别为10.611和1.665 MPa。结果表明,应变补偿Arrhenius模型能准确预测AA7022-T6铝合金的热流变应力。

Abstract: The thermomechanical behavior of precipitation-hardened aluminum alloy AA7022-T6 was studied using isothermal compression at temperatures of 623-773 K and strain rates of 0.01-1 s-1. The experimental results indicated that dynamic recrystallization (DRX) is a predominant hot deformation mechanism, especially at elevated temperatures and low strain rates. The modified Johnson-Cook (J-C) and the strain compensated Arrhenius-type models were developed to predict the hot flow behavior under different deformation conditions. The correlation coefficients of modified J-C model and the strain compensated Arrhenius-type models were 0.9914 and 0.9972, respectively, their average relative errors (ARE) were 6.074% and 4.465%, respectively, and their root mean square errors (RMSE) were 10.611 and 1.665 MPa, respectively, indicating that the strain compensated Arrhenius-type model can predict the hot flow stress of AA7022-T6 aluminum alloy with an appropriate accuracy.

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