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材料工程  2016, Vol. 44 Issue (1): 33-39    DOI: 10.11868/j.issn.1001-4381.2016.01.005
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
7A85铝合金的热压缩流变行为与显微组织
仇琍丽1, 高文理1, 陆政2, 冯朝辉2
1. 湖南大学材料科学与工程学院, 长沙 410082;
2. 北京航空材料研究院, 北京 100095
Flow Behavior and Microstructure of 7A85 Aluminum Alloy During Hot Compression
QIU Li-li1, GAO Wen-li1, LU Zheng2, FENG Zhao-hui2
1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China
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摘要 采用Gleeble-3500热模拟试验机对铸态7A85铝合金进行高温热压缩实验,研究了7A85铝合金在变形温度为300~450℃、应变速率为0.01~10s-1条件下的流变行为与显微组织。结果表明:流变应力在变形初期迅速升至峰值,随后由于动态回复和动态再结晶有所降低,最后趋于稳态;峰值流变应力随变形温度的降低和应变速率的增加而增大,可用Zener-Hollomon参数描述。采用线性回归方法获得7A85铝合金高温条件下流变应力本构方程,其变形激活能Q为253.68kJ/mol。随着lnZ降低,晶粒沿径向拉长,亚晶长大,位错密度和第二相数量降低。软化机制主要为动态再结晶。
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仇琍丽
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关键词 7A85铝合金热压缩本构方程显微组织    
Abstract:The flow stress behavior and the microstructure evolution of as-cast 7A85 aluminum alloy were studied by the hot compression test, which was performed on Gleeble-3500 thermal simulation machine at 300-450℃ and strain rate 0.01-10s-1. The results show that the true stress is rising to peak stress rapidly in the initial deformation period, then the flow stress decreases due to dynamic recovery and dynamic recrystallization, finally the flow stress tends to be stable. The peak flow stress increases with decreasing deformation temperature and increasing strain rate. It can be described by Zener-Hollomon parameter. The constitutive equation of 7A85 aluminum alloy is obtained by linear regression, and the hot deformation activation energy Q is 253.68kJ/mol. With the decreasing of lnZ, the grains are elongated radially, the sub-grains grow up, the dislocation density and the quantity of second phase particles decrease. The softening mechanism is mainly dynamic recrystallization.
Key words7A85 aluminum alloy    hot compression    constitutive equation    microstructure
收稿日期: 2014-07-10      出版日期: 2016-01-20
中图分类号:  TG146.2  
通讯作者: 高文理(1964-),男,副教授,工学博士,研究方向:铝合金、镁合金及金属基复合材料,联系地址:湖南省长沙市麓山南路2号湖南大学材料学院(410082)     E-mail: wenligaohd@163.com
引用本文:   
仇琍丽, 高文理, 陆政, 冯朝辉. 7A85铝合金的热压缩流变行为与显微组织[J]. 材料工程, 2016, 44(1): 33-39.
QIU Li-li, GAO Wen-li, LU Zheng, FENG Zhao-hui. Flow Behavior and Microstructure of 7A85 Aluminum Alloy During Hot Compression. Journal of Materials Engineering, 2016, 44(1): 33-39.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.01.005      或      http://jme.biam.ac.cn/CN/Y2016/V44/I1/33
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