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材料工程  2012 

6005A-T6铝合金搅拌摩擦焊接头组织与力学性能特征

, PP. 27-31

Keywords: 6005A铝合金,搅拌摩擦焊,微观组织,显微硬度,拉伸性能

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Abstract:

采用光学显微镜、扫描电子显微镜、透射电子显微镜、拉伸实验机和显微硬度计对6005A铝合金搅拌摩擦焊接头的微观组织及力学性能进行了研究。结果表明焊核区为细小的等轴晶,几乎所有粒子溶于基体;热机械影响区呈现为被拉长的畸变晶粒,且存在大量的位错;热影响区的组织明显粗化,处于过时效状态。与母材相比,搅拌摩擦焊接头的强度及伸长率均有下降趋势,且接头出现软化,最小硬度值出现在前进侧的热影响区内。搅拌头旋转速率为1200r/min、焊接速率为200mm/min时可获得优质接头,抗拉强度达到母材强度的72%,伸长率达到母材的69%。

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