Effects of welding speed on the microstructure and hardness in friction stir welding joints of 6005A-T6 aluminum alloy

被引：101
作者：
Dong, Peng [1 ]
Li, Hongmei [1 ]
Sun, Daqian [1 ]
Gong, Wenbiao [2 ]
Liu, Jie [2 ]
机构：
[1] Jilin Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Automobile Mat, Changchun 130025, Peoples R China
[2] Changchun Railway Vehicles Co Ltd, Changchun 130062, Peoples R China
来源：
MATERIALS & DESIGN | 2013年 / 45卷
关键词：
Non-ferrous metals and alloys; Welding; Microstructure; MECHANICAL-PROPERTIES; DIFFRACTION PATTERNS; HARDENING BEHAVIOR; CRYSTAL-STRUCTURE; AL; PRECIPITATION; PHASE; EVOLUTION; BETA';
D O I：
10.1016/j.matdes.2012.09.040
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The 6005A-T6 aluminum alloy was friction stir welded at different welding speeds. The peak temperature, microstructure and mechanical properties were examined for these joints. A special attention was devoted to the relationship between the precipitates evolution within different zones and the local hardness. In the nugget zone (NZ) experiencing the highest peak temperature, the beta '' precipitates dissolved into alpha-Al matrix during welding, and the hardness of NZ depended on the level of natural aging (NA) at different welding speeds. The thermo-mechanically affected zone (TMAZ) is characterized by elongated grains with a high density of dislocations. The welding speed had not a significant effect on hardness in this zone. The heat-affected zone (HAZ) contains the transformation of beta ''-beta', the precipitation of Q' and the coarsening of precipitates. The HAZ close to the joint center line exhibited the minimum hardness due to the coarsening of beta' and Q' precipitates while the HAZ far from it having a high hardness level was mainly related to coherent beta '' precipitates. The HAZ hardness and joint strength have an increased tendency with increasing the welding speed. It can be explained by increasing the density of Q' or beta '' precipitates. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：524 / 531
页数：8
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