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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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高强铝合金焊接接头无析出物区的形成机理
, PP. 91-97
Keywords: 高强铝合金,部分熔化区,无析出物区
Abstract:
采用电弧焊对20mm厚的2519-T87高强铝合金进行表面堆焊，观察了部分熔化区出现的无析出物区(PFZ)的组织特征，并对该区域的形成机理进行了研究.结果表明无析出物区的形成主要是晶界液化层迁移所导致的，迁移的驱动力为相干应变能，焊缝收缩引起前、后晶粒的应变能差以及晶界曲率引起的界面能差.焊接热输入对无析出物区的形成有一定影响，随着焊接热输入的增加，无析出物区的宽度亦增加.该区的存在使部分熔化区在拉伸和冲击过程中易于断裂，且断裂方式为沿晶断裂.
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