为优化铝合金7075形变热处理工艺参数,采用正交试验方法设计5因素4水平正交表,完成小样本试验。以硬度、第二相体积分数和晶粒尺寸作为指标值进行单指标极差分析和多指标灰关联分析,研究固溶温度、固溶时间、变形量、时效温度、时效时间对指标值的影响大小及贡献度。由贡献度优化铝合金7075形变热处理工艺参数为480℃固溶处理40 min+60%压缩变形+100℃时效6 h。 In order to optimize the process parameters of the heat treatment of 7075 aluminum alloy, orthogonal experiment was used to design a 5-factor 4-level orthogonal table to complete the small sample test. The single-target range analysis and multi-index gray correlation analysis were conducted with hardness, phase volume fraction and grain size as indexes to study the effect of solution temperature, solution time, deformation, aging temperature and aging time on index value Size and contribution. From the degree of contribution to optimize the aluminum alloy 7075 deformation heat treatment process parameters of 480 ℃ solution treatment 40 min + 60% compression set + 100 ℃ aging 6 h.