175℃回归7150-RRA铝合金力学性能及剥蚀性能  

Mechanical properties and exfoliation behavior of 7150-RRA aluminum alloy retrogressed at 175℃

作　　者：蔡彪[1] 李劲风[1] 贾志强[1] 李朝兴[1] 郑英鹏[1] 蔡圳阳[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《材料热处理学报》2009年第1期109-113,共5页Transactions of Materials and Heat Treatment

基　　金：中南大学创新实验计划项目(LB07079);宁夏自然科学基金(NZ0618);宁夏大学自然基金(LG0502)

摘　　要：采用拉伸性能测试、剥落腐蚀实验及透射电镜观察研究了175℃回归时7150-RRA铝合金力学性能、剥蚀行为及微观组织,并与T6及T73时效工艺进行了比较研究。结果表明,7150-T6铝合金强度高而剥蚀敏感性大;7150-T73铝合金强度降低而耐腐蚀性大幅度提高。175℃回归时,7150-RRA铝合金剥蚀敏感性随回归时间延长而降低;回归时间延长至3h,7150-RRA铝合金可保持7150-T6的高强度,而其剥蚀敏感性与7150-T73接近。The mechanical properties, exfoliation behavior and microstructure of 7150-RRA Al alloy retrogressed at 175 ℃ were investigated, and compared with that of 7150-T6 and 7150-T73 treatments. The results indicate that 7150-T6 Al alloy possesses high strength and great exfoliation corrosion susceptibility, T-/3 treatment lowers the strength of 7150 Al alloy and greatly decreases its exfoliation corrosion susceptibility. The exfoliation corrosion susceptibility of 7150-RRA Al alloy retrogressed at 175℃ decreases with the extension of retrogression time. As retrogressed at 175℃ , the retrogression time can be extended to 3 h. Under such circumstance, the 7150-RRA Al alloy retains the strength of 7150-T6 Al alloy and also shows a good exfoliation corrosion resistance close to that of the 7150-T73 Al alloy.

关 键 词：7150-RRA铝合金 回归再时效(RRA) 力学性能 剥落腐蚀 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—金属材料]