Microstructure and Strain Hardening of a Friction Stir Welded High-Strength Al–Zn–Mg Alloy

被引：5
|
作者：
A.H.Feng [1 ,2 ]
D.L.Chen [3 ]
Z.Y.Ma [4 ]
W.Y.Ma [2 ]
R.J.Song [1 ]
机构：
[1] School of Materials Science and Engineering,Tongji University
[2] State Key Laboratory of Advanced Welding Production Technology,School of Materials Science and Engineering,Harbin Institute of Technology
[3] Department of Mechanical and Industrial Engineering,Ryerson University,Toronto,ON M5B 2K3,Canada
[4] Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences
来源：
Acta Metallurgica Sinica(English Letters) | 2014年 / 27卷 / 04期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Aluminum alloy; Friction stir welding; Mechanical properties; Strain hardening;
D O I：
暂无
中图分类号：
TG453.9 []; TG146.21 [];
学科分类号：
摘要：
Microstructural evolution and strain hardening behavior of a friction stir welded(FSWed) high-strength7075Al-T651 alloy were evaluated.The nugget zone was observed to consist of fine and equiaxed recrystallized grains with a low dislocation density and free of original precipitates,but containing uniformly distributed dispersoids.The strength,joint efficiency,and ductility of the FSWed joints increased with increasing welding speed.A joint efficiency of *91% was achieved at a welding speed of 400 mm/min and rotational rate of 800 r/min,while the ductility remained basically the same as that of the base metal.There was no obvious strain rate sensitivity observed in both base metal and welded joints.While both the base metal and FSWed joints exhibited stage III and IV hardening characteristics,the hardening capacity,strain hardening exponent,and strain hardening rate all increased after friction stir welding.
引用
收藏
页码：723 / 729
页数：7
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