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20卷    第3期    总第132期    2010年3月

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文章编号:1004-0609(2010)03-0420-07
Al-Mn-Mg-Cu-Ni合金热压缩变形的流变行为和组织
范  曦1,潘清林1,李建湘2,杨志兵2,刘晓艳1,覃银江1

(1. 中南大学 材料科学与工程学院, 长沙 410083;
2. 中山市金胜铝业有限公司,中山 528463
)

摘 要: 在Gleeble−1500热模拟机上对Al-Mn-Mg-Cu-Ni合金进行热压缩试验,分析合金的流变应力与应变速率和变形温度之间的关系,计算高温变形时的变形激活能,并研究合金在变形过程中的显微组织。结果表明:Al-Mn-Mg-Cu-Ni合金在本实验条件下具有正的应变速率敏感性;流变应力随应变速率的增大而增大,随变形温度的升高而减小。该合金热压缩变形的流变应力行为可用双曲正弦形式的本构方程来描述,也可用Zener-Hollomon参数来描述,其变形激活能为209.84 kJ/mol。随着热变形温度的升高和应变速率的减小,合金中的主要软化机制逐步由动态回复转变为动态再结晶。

 

关键词: Al-Mn-Mg-Cu-Ni合金;热压缩变形;流变应力;显微组织

Flow behavior and microstructure of
Al-Mn-Mg-Cu-Ni alloy during hot compression deformation
FAN Xi1, PAN Qing-lin1, LI Jian-xiang2, YANG Zhi-bin2, LIU Xiao-yan1, QIN Yin-jiang1

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Jeoshion(zhongshan) Aluminium Factory, Zhongshan 528463, China

Abstract:The hot compression deformation test of Al-Mn-Mg-Cu-Ni alloy was performed on Gleeble−1500 system. The relationships between flow stress and deformation temperature as well as strain rate were analyzed, and the deformation activation energy was calculated. The microstructures during the hot deformation process were observed. The results show that the flow stress is sensitive to the strain rate and the deforming temperature. The flow stress increases with increasing the strain rate, and decreases with increasing the deforming temperature, which can be described by a constitutive equation in hyperbolic sine function with the hot deformation activation energy of 209.84 kJ/mol, and can also be described by a Zener-Hollomon parameter. The main soften mechanism of the alloy transforms from dynamic recovery to dynamic recrystallization with increasing the temperature and decreasing the strain rate.

 

Key words: Al-Mn-Mg-Cu-Ni alloy; hot compression deformation; flow stress; microstructure

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

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

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