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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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2099-T83/2060-T8异质Al-Li合金搅拌摩擦焊搭接界面结构与力学性能
DOI: 10.11900/0412.1961.2014.00297, PP. 281-288
Keywords: 2099-T83,Al-Li合金,2060-T8,Al-Li合金,搅拌摩擦焊接,人工时效处理,界面形貌,接头强度
Abstract:
采用搅拌摩擦焊(FSW)对厚度为2mm的2099-T83与2060-T8Al-Li合金进行搭接.利用OM和SEM等分析技术探讨搅拌头转速和搅拌针长度对搭接接头界面结构与力学性能的影响.结果表明,2099-T83/2060-T8搭接接头焊缝区可观察到明显的结合界面,焊缝区显微硬度低于母材,且在热机影响区与焊核区的过渡区硬度最低.当搅拌头转速由600r/min增加到800r/min,且搅拌针长度由3.0mm减小至2.5mm时,界面形貌由光滑界面转变成“锯齿状”咬合界面,焊缝区结合界面形貌主要受搅拌针长度影响,“锯齿状”咬合界面搭接接头平均破坏载荷为654N.搭接接头均在底部母材2060-T8侧热机影响区与焊核区的过渡区断裂,断裂特征为韧-脆混合断裂.“锯齿状”咬合界面搭接接头经150℃,保温20h人工时效处理后,焊缝区显微硬度有所提升,接头承载能力较未经人工时效处理的降低了20%,断口呈现脆性断裂模式.
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