宇航材料工艺2018，Vol.48Issue(2)：56-60,5.DOI:10.12044/j.issn.1007-2330.2018.02.011
2219-T87/T852铝合金异质接头力学性能弱化及断裂机制
Weakening Mechanism and Fracture Behavior of Dissimilar Joint of 2219-T87/T852 Aluminum Alloy
摘要
Abstract
Dissimilar joint between 2219-T87 and 2219-T852 alloys were produced by VPTIG.The weakened zone of the joint was determined by tensile test,and the weakening mechanism and fracture behavior of joints were discussed after observing of the grain size,element segregation and precipitates distribution.The results showed that the average ultimate tensile strength and elongation of VPTIG joints at-196°C reached up to 314 MPa and 5.68％,respectively.All joints were broken from the heat affected zone of 2219-T852 side,where showed the worst segregation of the Cu element,dissolving and coarsening of precipitates,non-uniform grain sizes,and the strain localization caused by the joint deformation.The fracture originated at the edge of the weld seam from the joint bottom surface,and propagated along the heat affected zone to the top surface,showed a mixed fracture mode.关键词
2219铝合金/薄弱区/微观组织/断裂行为Key words
2219/Aluminum alloy/Weakened zone/Microstructure/Fracture behavior分类
矿业与冶金引用本文复制引用
黄诚,王非凡,鄢东洋,刘德博,胡正根..2219-T87/T852铝合金异质接头力学性能弱化及断裂机制[J].宇航材料工艺,2018,48(2):56-60,5.基金项目
航天先进制造技术研究联合基金(U1637601) （U1637601）
