回归处理对7055铝合金组织和性能的影响  

Effect of Retrogression Stage on Microstructure and Mechanical Property of 7055 Alloy

作　　者：黄乐瑜[1] 张新明[1] 刘胜胆[1] 韩念梅[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：《热加工工艺》2012年第2期178-182,共5页Hot Working Technology

基　　金：国际科技合作项目(2008DFR50260);高性能大规格铝材的制备关键技术(2008DFR50260)

摘　　要：采用硬度、电导率测试、晶间腐蚀形貌及透射电镜观察等手段,研究了回归处理对7055铝合金组织与性能的影响。结果表明:7055铝合金RRA处理后硬度高于相应回归条件下的硬度,且经历回归再时效处理后能够得到比T6态的更高的硬度;在硬度持续下降之前,R曲线的谷点对应着RRA曲线的峰值;7055铝合金回归及RRA态的抗晶间腐蚀能力随回归时间的延长都先降低而后逐渐提高;7055铝合金的抗晶间腐蚀能力并不总是与导电率成正相关的关系;RRA处理提高了7055铝合金的抗晶间腐蚀能力;RRA硬度曲线峰值点处,7055铝合金抗晶间腐蚀性能随回归温度的上升而提高。The effects of retrogression treatment on the microstructure and properties of 7055 alloy were investigated using hardness tests,electric conductivity tests,intergranular corrosion test and TEM observation.The results show that the hardness of 7055 alloy after retrogression and re-aging（RRA） treated is higher than the corresponding R state.The hardness of the alloy after RRA treatment is higher than the T6 state.The intergranular corrosion property of 7055 alloy first increases then decreases during retrogression and re-aging.The intergranular corrosion property of the alloy decreases with the increase of retrogression temperature.

关 键 词：回归处理 微观组织 性能 7055铝合金 

分 类 号：TG156.9[金属学及工艺—热处理] TG146[金属学及工艺—金属学]