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7A60-T6超高强铝合金搅拌摩擦焊接头的组织及性能
          
Microstructure and Mechanical Properties of 7A60-T6 Ultrahigh Strength Aluminium Alloy Friction Stir Welded Joints

摘    要
采用搅拌摩擦焊方法对6 mm厚7A60-T6超高强铝合金进行了焊接试验,分析讨论了接头的显微组织和力学性能。结果表明: 接头焊核区组织发生了动态再结晶,形成了细小的等轴再结晶晶粒,同时析出相大部分固溶入基体,热影响区晶粒粗化,在晶界处析出大量的析出相,前进侧热机影响区晶粒发生了较大程度的变形,后退侧晶粒变形程度较小; 在旋转速率为300 r·min-1、焊接速率为100 mm·min-1或旋转速率为600 r·min-1、焊接速率为300 mm·min-1时,接头的抗拉强度分别达到了465 MPa和464 MPa,可达母材抗拉强度的 70%; 接头微观断口中存在大量的小韧窝且韧窝较浅偏脆性,其断裂形式为韧性为主脆性为辅的混合型断裂; 接头上表面的显微硬度高于接头横截面的硬度,焊核区上部硬度高于下部硬度。
标    签 搅拌摩擦焊   7A60-T6铝合金   显微组织   力学性能   friction stir welding   7A60-T6 aluminium alloy   microstructure   mechanical property  
 
Abstract
Microstructures and mechanical properties of the whole specimen in 6 mm thickness TA60-T6 aluminium alloy plate joints obtained by friction stir welding (FSW) were studied. The results show that fine equiaxed and recrystallized grains could be observed in the weld nugget zone(WNZ), and the segregation phases mostly dissolved into the matrix. The microstructure of the heat affected zone(HAZ) consisted of coarse bar-shape recovery grain, and a large number of segregation phases appeared at the grain boundaries. Microstructure of the thermo-mechanically affected zone(TMAZ) on advancing side consisted of highly deformed grains, and small deformation on retreating side. When the rotating speed was 300 r·min-1 and the welding speed was 100 mm·min-1 or the rotating speed was 600 r·min-1 and the welding speed was 300 mm·min-1, the good weld was achieved, and the tensile strength of the joint reached 465 MPa and 464 MPa, about 70% of the ultimate strength of the base metal. The fracture analysis show that there were lots of low mesh dimples, the fracture mode of the joint was ductile/brittle mixed fracture. The micro-hardness of the top surface of the FSW joint was higher than that of the transversal section, and the micro-hardness of the weld nugget zone presented an ascending trend form bottom to top.

中图分类号 TG453

 
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所属栏目 试验与研究

基金项目 国防基金资助项目(KZ101302117)

收稿日期 2012/10/29

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备注董继红(1982-),男,工程师,硕士。

引用该论文: DONG Ji-hong,DONG Chun-lin,LUAN Guo-hong. Microstructure and Mechanical Properties of 7A60-T6 Ultrahigh Strength Aluminium Alloy Friction Stir Welded Joints[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2013, 49(8): 516~521
董继红,董春林,栾国红. 7A60-T6超高强铝合金搅拌摩擦焊接头的组织及性能[J]. 理化检验-物理分册, 2013, 49(8): 516~521


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