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

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第6期    总第255期    2020年6月

[PDF全文下载]    [Flash在线阅读]    

    

文章编号:1004-0609(2020)-06-1230-08
6082铝合金热变形过程中的动态再结晶行为
徐振宇1, 3,胡道春2, 4

(1. 金华职业技术学院 机电工程学院,金华 321007;
2. 南京工业职业技术学院 工程技术实训中心,南京 210023;
3. 金华职业技术学院 汪卫华院士专家工作站,金华 321007;
4. 江苏省精密制造工程技术研究开发中心,南京 210023
)

摘 要: 借助电子背散射衍射(EBSD)和透射电子显微镜(TEM)研究6082铝合金在623~773 K和0.01~5 s-1条件等温热压缩时的动态再结晶行为。结果表明:6082铝合金真应力-应变曲线虽无明显单峰值特征,但仍发生动态再结晶,并且动态再结晶程度与Z参数紧密相关。在ln Z=24.9014(723 K, 0.1 s-1)热压缩时,动态再结晶体积分数最高,为38.6%。应用加工硬化率确定了动态再结晶初始临界应变,建立临界应变与Z参数之间的定量关系,得到动态再结晶临界应变方程。结合EBSD分析测试结果建立6082铝合金动态再结晶动力学模型。微观组织分析发现,原始晶粒内形成的亚晶结构随着变形的进行持续吸收位错,其取向差不断增大至大角度晶界,从而形成新的再结晶晶粒。在原始晶界附近通过亚晶界迁移引起亚晶粗化,使其小角度晶界形成大角度晶界的连续动态再结晶是其动态再结晶的主要机制。

 

关键词: 6082铝合金;动态再结晶模型;Zener-Hollomon参数;连续动态再结晶

Dynamic recrystallization behavior of 6082 aluminum alloy during hot deformation
XU Zhen-yu1, 3, HU Dao-chun2, 4

1. Mechanical & Electrical Engineering College, Jinhua Polytechnic, Jinhua 321007, China;
2. Engineering Technology Training Center, Nanjing Institute of Industry Technology, Nanjing 210023, China;
3. Academician Wang Weihua Expert Workstation, Jinhua Polytechnic, Jinhua 321007, China;
4. Jiangsu Research and Development Center of Precision Manufacturing, Nanjing 210023, China

Abstract:The dynamic recrystallization behaviors of 6082 aluminum alloy at the temperature range of 623-773 K and strain rate range of 0.01-5 s-1 were studied by electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM). According to the experimental results, dynamic recrystallization occurs during hot deformation of 6082 aluminum alloy, although the true stress-strain curve has no obvious single peak characteristic, and the degree of dynamic recrystallization is closely related to Z parameter. Hot compression with ln Z=24.9014 (723 K, 0.1 s-1) gives rise to the highest fraction of recrystallization of 38.6%. The initial critical strain of dynamic recrystallization was determined by work hardening rate. The quantitative relationship between critical strain and Z parameters was established. Based on the results of EBSD analysis and measurement, a dynamic recrystallization kinetics model of 6082 aluminum alloy during hot deformation is deduced. Microstructure analysis shows that the subgrain structure formed in the original grain is coarsened by grain boundary migration, and the orientation difference increases continuously until the large angle grain boundary is formed, resulting in dynamic recrystallization grains, and the likely mechanism is continuous dynamic recrystallization.

 

Key words: 6082 aluminum alloy; dynamic recrystallization model; Zener-Hollomon parameter; continuous dynamic recrystallization

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
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com