热处理工艺对6A02合金管材组织性能的影响  

Microstructure and Properties of 6A02 Aluminum Alloy Extruded Tube with Heat Treatment

作　　者：陈佳[1] 闫晓东[1] 沈健[1] 杨银[1] 陈松[1] 

机构地区：[1]北京有色金属研究总院加工事业部,北京100088

出　　处：《稀有金属》2016年第3期193-200,共8页Chinese Journal of Rare Metals

基　　金：国家科技部重点基础研究发展计划项目(2012CF619304)资助

摘　　要：采用光学显微镜（OM）、扫描电子显微镜（SEM）、能谱仪（EDX）、正交试验及力学性能测试等手段研究了热处理工艺对6A02铝合金管材组织性能的影响。结果表明：6A02铝合金管材的挤压态组织分布着形貌各异、尺寸大小约为0.5～8.0μm的Al-Fe-Si-Mn-Cu相。固溶处理后,细小点状的Al-Fe-Si-Mn-Cu相基本回溶到基体中,粗大不规则的Al-Fe-Si-Mn-Cu相残留下来。该残留相尺寸在510℃固溶时略微变大,在520℃固溶时尺寸有所变小。正交试验极差分析表明,以抗拉强度和屈服强度为考核指标时,各影响因素的主次关系排序为：时效温度〉固溶时间〉固溶温度〉时效时间。方差分析表明,热处理过程中,时效温度对合金抗拉强度的影响显著,而时效温度、固溶时间及固溶温度对合金屈服强度的影响显著。6A02铝合金最佳的固溶-时效工艺为520℃×40 min＋160℃×12 h,对应的力学性能指标分别达：抗拉强度σb=333.83 MPa,屈服强度σs=321.11 MPa和延伸率δ=17.28%。The influence of heat treatment process on microstructure and mechanical properties of 6A02 aluminum alloy was investigated by optical microscopy（ OM）,scanning electron microscopy（ SEM）,energy dispersive X-ray（ EDX） spectrum,orthogonal test design and tensile properties measurement. The results showed that Al-Fe-Si-Mn-Cu phases of different morphologies with size ranging from 0. 5 to 8. 0 μm were found in 6A02 aluminum alloy extruded tube. After solution treatment,the point shape Al-Fe-Si-Mn-Cu phase melted,and the coarse Al-Fe-Si-Mn-Cu phase remained. The size of residual phase became slightly bigger with solution treatment at 510 ℃,and became smaller at 520 ℃. The range analysis of orthogonal test showed that the importance order of effect factors was aging temperature 〉solid solution time〉 solid solution temperature 〉aging time when using tensile strength and yield strength as assessment index. The analysis of variance showed that the effect of aging temperature on tensile strength was significant,and the influence of aging time,solution time,solution temperature on yield strength was also significant in the heat treatment process. The suitable solution and aging treatment for 6A02 alloy was 520 ℃ × 40 min ＋ 160 ℃ × 12 h,after which the tensile strength,yield strength and elongation of the aged alloy were 333. 83,321. 11 MPa and 17. 28%,respectively.

关 键 词：6A02铝合金 正交试验 固溶-时效工艺 组织性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]