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材料工程  2004 

柱形光头搅拌针搅拌摩擦焊接铝锂合金接头组织及力学性能

Keywords: 搅拌摩擦焊,柱形光头搅拌针,铝锂合金

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Abstract:

采用柱形光头搅拌针搅拌摩擦焊接5mm厚的铝锂合金轧制板,并对接头组织和力学性能进行了分析.焊后接头形成了三个组织差异明显的区域焊核区,热机影响区和热影响区.焊核区微观组织呈鱼鳞状;热影响区组织在焊接热循环作用下,发生回复反应,形成棒状的回复晶粒;前进侧和后退侧热机影响区内为颗粒较大的等轴晶晶粒,且后退侧晶粒尺寸大于前进侧.力学性能测试结果表明,焊接速度υ=40mm/min时,接头获得最高拉伸强度(296MPa);焊接速度υ=80mm/min时,接头获得最大延伸率(8.6%).硬度测试结果表明,焊缝区发生了软化,前进侧和后退侧材料的软化区间大致相同,但后退侧软化程度高于前进侧.

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