Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第9期    总第234期    2018年9月

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文章编号:1004-0609(2018)-09-1737-09
5083铝合金热压缩应力-应变曲线修正与热加工图
高文理,关宇飞

(湖南大学 材料科学与工程学院,长沙 410082)

摘 要: 在Gleeble-3500热模拟试验机上对圆柱体5083铝合金试样进行温度为300~500 ℃、应变速率为0.001~ 1 s-1条件下的热压缩试验。对实验获得的真应力应变曲线进行摩擦修正,依据摩擦修正后的应力应变曲线计算本构方程,采用包含Zener-Hollomon参数的本构方程描述摩擦修正后的5083铝合金流变应力行为,其热变形激活能为164.17 kJ/mol。根据摩擦修正后的真应力-应变曲线绘制热加工图,随着真应变的增加,失稳区域向着高应变速率、高变形温度区域扩展,5083铝合金适宜热变形工艺参数:变形温度为400~500 ℃、变形速率为0.01~0.1 s-1与340~450 ℃、变形速率为0.001~0.01 s-1。随着变形温度升高与应变速率降低,晶粒内位错密度减少,主要软化机制逐渐由动态回复转变为动态再结晶。

 

关键字: 5083铝合金;应力-应变曲线修正;本构方程;热加工图;显微组织演变

Correction of flow stress-strain curve and processing maps of 5083 aluminum alloy during hot compression
GAO Wen-li, GUAN Yu-fei

School of Materials Science and Engineering, Hunan University, Changsha 410082, China

Abstract:The hot compression tests of the cylindrical 5083 aluminum alloy sample were carried out on Gleeble-3500 thermal simulator at the temperature range of 300-500 ℃ and the strain rate range of 0.001 s-1. The real stress and strain curves obtained by the experiment were subjected to friction correction. The constitutive equation of Zener-Hollomon parameters was used to describe the flow behavior of 5083 aluminum alloy after friction correction and activation energy of the thermal deformation is 164.17 kJ/mol. According to the friction correction of the true stress-strain curve drawing the processing map, finding that the unstable region expands toward high strain rate and high deformation temperature with the increase of true strain. The suitable thermal deformation process parameters of 5083 aluminum alloy are as follows: deformation temperatures of 400-500 ℃ at deformation rates of 0.01-0.1 s-1 and deformation temperatures of 340-450 ℃ at deformation rates of 0.001-0.01 s-1.With the increases of deformation temperature and strain rate, the dislocation density within the grain decreases, and the main softening mechanism gradually changes from dynamic recovery to dynamic recrystallization.

 

Key words: 5083 aluminum alloy; stress-strain curve correction; constitutive equation; processing map; microstructural evolution

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
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