7039铝合金的热压缩变形本构方程
Thermal Compression Deformation Constitutive Equation of 7039 Aluminum Alloy
摘 要
采用圆柱试样在Gleeble-1500材料热模拟试验机上对7039铝合金进行等温压缩变形试验,研究了该合金在变形温度为300～500℃、应变速率为0.01～1 s-1条件下的流变行为.结果表明:变形温度和应变速率对7039铝合金的流变应力有显著影响,流变应力随变形温度的升高而降低,随应变速率的增加而升高;7039铝合金的高温流变行为可用包含Arrhenius项的Zener-Hollomon参数来描述,其热变形本构方程为=5.30×1012[sinh(0.011σ)]5.28×exp[-173.68×103/(RT)].
热压缩变形
流变应力
Zener-Hollomon参数
7039 aluminum alloy
hot compression deformation
flow stress
Zener-Hollomon parameter
Abstract
The flow stress features of 7039 aluminum alloy were studied by isothermal compression of cylindrical specimens at 300-500℃ and strain rate of 0.01-1 s-1 with Gleeble-1500 material simulation machine.The results show that strain rate and deformation temperature had a great effect on the flow stress.The flow stress increased with the increase of strain rate and decreased with the increase of deformation temperature.The flow stress of 7039 aluminum alloy during high temperature deformation process could be represented by Zener-Hollomon parameter including the Arrhenius term and the thermal deformation constitutive equation was =5.30×1012[sinh(0.011σ)]5.28×exp[-173.68×103/(RT)].
中图分类号 TG146.2
所属栏目 材料性能及其应用
基金项目 国家自然科学基金资助项目(50671121)
收稿日期 2008/5/25
修改稿日期 2009/1/13
网络出版日期
作者单位点击查看
备注蔡一鸣(1973-),男,江苏常州人,博士研究生.
引用该论文: CAI Yi-ming,LI Hui-zhong,LIANG Xiao-peng,TANG Guo-jian. Thermal Compression Deformation Constitutive Equation of 7039 Aluminum Alloy[J]. Materials for mechancial engineering, 2009, 33(7): 48～51
蔡一鸣,李慧中,梁霄鹏,汤国建. 7039铝合金的热压缩变形本构方程[J]. 机械工程材料, 2009, 33(7): 48～51
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参考文献
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【3】黄兰萍,陈康华,李松,等.高温预析出对Al-Zn-Mg 铝合金组织、力学性能和应力腐蚀性能的影响[J].中国有色金属学报,2005,15(5):727-733.
【4】黄继武,尹志民,聂波,等.7A52铝合金原位加热过程中的物相转变与热膨胀系数测量[J].兵器材料科学与工程,2007,30(4):9-12.
【5】李慧中,张新明,陈明安,等.2519铝合金热变形行为[J].中国有色金属学报,2005,15(4):621-625.
【6】CERRI E,EVANGELISTA E,FORCELLESE A,et al.Comparative hot workability of 7012 and 7075 alloys after different pretreatments[J].Materials Science and Engineering A,1995,197(1/2):181-198.
【7】林高用,张辉,郭武超,等.7075铝合金热压缩变形流变应力[J].中国有色金属学报,2001,11(3):412-415.
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【9】WANG Yu,LIN Dong-liang.A correlation between tensile flow stress and Zenner-Hollomon factor in TiAl alloys at high temperatures[J].J Mat Sci,2000,19:1185-1188.
【10】YAO X X.The strain-rate sensitivity of flow stress and work-hardening rate in a hot deformed Al-1.0Mg alloy[J].J Mat Sci,2000,19:743-744.
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