Microstructure and microhardness of aluminium alloy friction stir welds with heat treatment

被引：25
|
作者：
Huang, Y. X. [1 ]
Wan, L. [1 ]
Lv, Z. L. [1 ]
Lv, S. X. [1 ]
Zhou, L. [2 ]
Feng, J. C. [1 ,2 ]
机构：
[1] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China
[2] Harbin Inst Technol Weihai, Shandong Prov Key Lab Special Welding Technol, Weihai 264209, Peoples R China
来源：
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2016年 / 21卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Self-support friction stir welding; Post-weld heat treatment; Microstructure; Microhardness; Abnormal grain growth; ABNORMAL GRAIN-GROWTH; MECHANICAL-PROPERTIES; 6061-T6; ALUMINUM; PRECIPITATION SEQUENCE; TENSILE PROPERTIES; AL-ALLOY; JOINTS; RECRYSTALLIZATION; TOOL; SHOULDER;
D O I：
10.1080/13621718.2016.1152748
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, the Al-Mg-Si aluminium alloy with a T6 temper is self-support friction stir welded, and the effect of post-weld heat treatment on joints is investigated by detailed microstructural investigations and microhardness measurements. The hardness decreases from average 59 to 52 HV with holding time ranging from 10 to 60 minutes at temperature 723 K. With increasing holding temperature, the microhardness becomes more uniform and increases. Microhardness profiles are explained by precipitate distributions and precipitation sequences. The fine grain structure undergoes abnormal grain growth, and the degree of which depends on holding temperature and intense plastic deformation, and the biggest size is more than 1 mm.
引用
收藏
页码：638 / 644
页数：7
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