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7475铝合金回填式FSSW接头微观组织与力学性能研究
作者:
作者单位:

北京工业大学

基金项目:

国家自然科学基金No.51704013和中国博士后基金No.2016M600881


MICROSTRUCTURE AND FAILURE MECHANISMS OF REFILL FRICTION STIR SPOT WELDED 7475 ALUMINUM ALLOY JOINTS
Author:
Affiliation:

Beijing University of Technology

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    摘要:

    本文针对7475铝合金回填式搅拌摩擦点焊展开研究,首先采用不同工艺参数对2mm 7475铝合金进行焊接,然后对焊点表面和横截面进行观察,同时对试样进行硬度测量和拉伸剪切测试。结果表明,根据焊缝微观组织可以将焊点分为四个部分,不同部位的晶粒尺寸不同；并在微观组织中发现了Hook、孔洞和未连接等由于材料流动性不佳造成的微观组织缺陷；同时,母材区和搅拌区的硬度明显高于热影响区和热机影响区；另外,焊点的最高硬度和拉伸剪切强度随着焊具旋转速度、搅拌套下压深度的变化而呈现规律性变化,但是搅拌套运动速率对焊点力学性能的影响不明显。

    Abstract:

    The 7475 aluminum alloy backfill friction stir spot welding is studied in this paper. Firstly, the 2mm 7475 aluminum alloy is welded by different process parameters, then the surface and cross section of the joint are observed, and the hardness and tensile shear test of the sample are carried out. The results show that the joint can be divided into four parts according to the weld microstructure, and the grain size of different parts is different. Hook, holes and unjointed microstructures due to poor fluidity of the material are found in the microstructure. At the same time, the hardness of the base metal zone and stirring zone is significantly higher than that of the heat affected zone and the thermo-mechanically affected zone; in addition, the highest hardness and tensile shear strength of the joint vary with welding tool rotation speed land the depth of the sleeve. However, the effect of the stirring sleeve movement rate on the mechanical properties of the solder joint is not obvious.

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卢振洋,龚文韬,陈树君,袁涛,李晓旭.7475铝合金回填式FSSW接头微观组织与力学性能研究[J].稀有金属材料与工程,2019,48(4):1267~1274.[Lu Zhenyang, Gong Wentao, Chen Shujun, Yuan Tao, Li xiaoxu. MICROSTRUCTURE AND FAILURE MECHANISMS OF REFILL FRICTION STIR SPOT WELDED 7475 ALUMINUM ALLOY JOINTS[J]. Rare Metal Materials and Engineering,2019,48(4):1267~1274.]
DOI：10.12442/j. issn.1002-185X.20180945

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  • 收稿日期:2018-09-12
  • 最后修改日期:2018-09-28
  • 录用日期:2018-09-29
  • 在线发布日期: 2019-05-13

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