7085-T7452铝合金搅拌摩擦焊接头组织及性能研究

孟遥; 夏佩云; 尹玉环; 徐奎; 黄征; 郭炳

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7085-T7452铝合金搅拌摩擦焊接头组织及性能研究
Research on microstructure and properties of friction stir welding welded joint for 7085-T7452 aluminum alloy
2019年49卷第8期页码：55-59
DOI：

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孟遥, 夏佩云, 尹玉环, 等. 7085-T7452铝合金搅拌摩擦焊接头组织及性能研究[J]. 电焊机, 2019,49(8):55-59.

MENG Yao, XIA Peiyun, YIN Yuhuan, et al. Research on microstructure and properties of friction stir welding welded joint for 7085-T7452 aluminum alloy[J]. 2019,49(8):55-59.
孟遥, 夏佩云, 尹玉环, 等. 7085-T7452铝合金搅拌摩擦焊接头组织及性能研究[J]. 电焊机, 2019,49(8):55-59. DOI：

MENG Yao, XIA Peiyun, YIN Yuhuan, et al. Research on microstructure and properties of friction stir welding welded joint for 7085-T7452 aluminum alloy[J]. 2019,49(8):55-59. DOI：

摘要

开展了不同工艺参数7085-T7452铝合金搅拌摩擦焊接试验研究,分析焊缝微观组织和接头力学性能,并对焊核区晶粒尺寸进行定量对比,重点研究焊核区强化相的分布特征。结果表明,焊核区由细小的等轴再结晶晶粒组成,焊核区晶粒尺寸范围为3.6～7.5μm,接头抗拉强度达到母材的70%以上,焊核区强化相中富含Cu,焊核区顶部强化相数量多于焊核区底部。

Abstract

The experiments of friction stir welding with different parameters are implemented on 7085-T7452 aluminum alloy. The microstructure of weld and the mechanical properties of welded joint are analyzed. The sizes of grains in nuclear zone（NZ） are compared quantitatively. The distribution characteristics of strengthening phase are emphatically studied. The results show that the NZ is composed of equiaxial recrystallized grains and the size range of these grains is 3.6～7.5 μm. The tensile strength of welded joint is over 70% of the base metal. There is rich Cu in the strengthened phase in the NZ. It can be seen that the strengthening phase at the top of NZ is more than that at the bottom of NZ.