大尺寸喷射沉积7075铝合金楔压致密化工艺

Densification technology of heavy gauge spray-deposited 7075 aluminium alloy in wedge pressing

用喷射沉积工艺制备大尺寸7075铝合金坯,探索楔压致密化工艺,研究楔压变形量和变形温度对材料组织及性能的影响。结果表明,采用局部变形、多道次小变形累积实现大变形的楔形压制工艺,能有效实现喷射沉积铝合金坯件的致密化,合适的工艺参数楔压温度为420℃-470℃,楔压变形60%;材料的相对密度为99.6%,布氏硬度为138.4,室温拉伸强度为395MPa,延伸率为6.15%,且组织和性能分布均匀。

The heavy gauge blank of 7075 aluminium alloys were produced by spray deposition.The densification technology of wedge pressing was searched.The microstructure and mechanical properties at different deformation extent and deforming temperature were studied.The results reveal that wedge pressing can be used for continuous compaction of the performs with large dimensions.The rational wedge pressing temperature is 420℃～470℃,and the rational deformation degree is 60%,whence the relative density of 7075 aluminium alloys is 99.6%,Brinell hardness is 138.4,tensile strength is 395 MPa,elongation percentage is 6.15%,and the distribution of microstructure and mechanical properties is uniform.