Strain Compensation of the Constitutive Equation for High Temperature Flow Stress of a Al-Cu-Li Alloy

被引：29
作者：
Ou, Ling [1 ,2 ,3 ]
Nie, Yufeng [1 ,2 ]
Zheng, Ziqiao [1 ]
机构：
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] Hunan Univ Technol, Sch Met Engn, Zhuzhou 412000, Peoples R China
[3] Cent South Univ, Mittal Met Ind Res, Changsha 410083, Peoples R China
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2014年 / 23卷 / 01期
关键词：
activation energy; Al-Cu-Li alloy; constitutive equation; flow stress; HOT-WORKING; DEFORMATION; ALUMINUM; PREDICTION; AEROSPACE;
D O I：
10.1007/s11665-013-0747-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In order to study the workability of a Al-Cu-Li alloy, isothermal hot compressive deformation was investigated in the temperature range of 350-500 A degrees C at strain rates in the range of 0.01-10/s up to a true strain of 0.9 on Gleeble-1500 mechanical testing machine. The flow stress increased rapidly to a peak value. The peak stress decreased with increasing deformation temperature and decreasing strain rate. The effects of strain rate and temperature on hot deformation behavior can be represented by a Zener-Hollomon parameter including an Arrhenius term. The influence of the strain has also been incorporated in the constitutive equation and four material constants alpha, n, A, and the activation energy Q were calculated by compensation of strain. The proposed constitutive equation (considering the compensation of strain) gives an accurate description for the flow stress of the Al-Cu-Li alloy.
引用
收藏
页码：25 / 30
页数：6
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