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石国辉,张永安,李锡武,李志辉,闫丽珍,闫宏伟,刘红伟,熊柏青.Al-9.4Zn-1.9Mg-2.0Cu合金的热变形流变行为与本构方程[J].稀有金属材料与工程(英文),2019,48(9):2753~2758.[Guohui Shi,Yongan Zhang,Xiwu Li,Zhihui Li,Lizhen Yan,Hongwei Yan,Hongwei Liu and Baiqing Xiong.Flow behaviors and corresponding constitutive equation of the Al-9.4Zn-1.9Mg-2.0Cu alloy[J].Rare Metal Materials and Engineering,2019,48(9):2753~2758.]
Flow behaviors and corresponding constitutive equation of the Al-9.4Zn-1.9Mg-2.0Cu alloy
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Received:February 20, 2019  Revised:July 01, 2019
DOI:
Key words: Al-Zn-Mg-Cu alloys  Hot compressive deformation  Flow stress behaviors  Constitutive equation model
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Guohui Shi,Yongan Zhang,Xiwu Li,Zhihui Li,Lizhen Yan,Hongwei Yan,Hongwei Liu and Baiqing Xiong  
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Abstract:
      Hot compression tests of the Al-9.39Zn-1.92Mg-1.98Cu alloy are carried out in the temperature range from 300 ?C to 460 ?C and the strain rate range from 0.001 s-1 to 1 s-1, and the height reduction degree is 70%. The flow stress is corrected because of the effect of friction. Results show the flow stress decreases with increasing the temperature increasing or decreasing the strain rate. The friction effect is more and more obvious when the temperature is low and the strain rate is high. A revised constitutive equation considering the influence of strain is established based on the Arrhenius-type model. Compared with the experimental and predicted flow stresses, the revised constitutive equation has a higher accuracy. Their correlation coefficient and average absolute relative error is 0.95 and 2.45%, respectively.