Heterogeneity of microstructure and mechanical properties of friction stir welded joints of Al-Zn-Mg alloy AA7039

被引：11
|
作者：
Sharma, Chaitanya [1 ]
Dwivedi, Dheerendra Kumar [1 ]
Kumar, Pradeep [1 ]
机构：
[1] Indian Inst Technol, Mech & Ind Engn Dept, Roorkee 247667, Uttar Pradesh, India
来源：
INTERNATIONAL CONFERENCE ON DESIGN AND MANUFACTURING (ICONDM2013) | 2013年 / 64卷
关键词：
Friction stir welding; heterogeneity; microstructure; mechanical properties; fracture; WELDING PARAMETERS; GRAIN-GROWTH; ALUMINUM;
D O I：
10.1016/j.proeng.2013.09.220
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Al-Zn-Mg aluminium alloy AA7039 was friction stir welded in order to investigate the influence of structural heterogeneity on mechanical properties of welded joints. Quality and mechanical properties of the developed weld joints were assessed by conducting bend, tensile and microhardness tests. Optical and scanning electron microscopy was used to analyze the microstructure and fracture surfaces respectively. It was found that joints were heterogeneous as different layers of joint exhibited significant heterogeneity in respect of microstructure and mechanical properties. Weld nugget grain size was found to decrease from top to bottom. Top layer of joint was strongest while middle layer was weakest. Weight % of Zn and Mg decreased from top to bottom layer of the joint. Mode of fracture was also found to be different for different layers of joint.
引用
收藏
页码：1384 / 1394
页数：11
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