夏罗生;

• 1:张家界航空工业职业技术学院

摘要(Abstract)：

采用搅拌摩擦焊方法对7050铝合金进行焊接试验。结果表明:当旋转速度为800 r/min、焊接速度为200 mm/min,焊接接头性能最佳,其抗拉强度为455.87 MPa,达到母材强度的88.86%,伸长率为7.34%;接头中心部位是一区域宽约7 mm的高硬度区,其显微硬度为155HV左右,两侧是宽约为4 mm的低硬度区。焊缝截面形貌整体呈现倒圆锥形,包括4个清晰的区域。焊核区形成了粒度细小、形状饱满、晶界明显的等轴再结晶组织,晶粒平均直径在5μm左右:拉伸断口发生在焊缝后退侧的热影响区,为单一韧窝状,韧窝尺寸在5~10μm。

关键词(KeyWords)： 搅拌摩擦焊;力学特性;微观组织;显微硬度;断口形貌

Abstract:

Keywords:

基金项目(Foundation): 湖南省教育厅资助科研项目(11C1290)

作者(Author): 夏罗生;

Email:

DOI: 10.14024/j.cnki.1004-244x.2013.04.031

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