挤压比对7N01铝合金应力腐蚀性能的影响  

Effects of extrusion ratios on stress corrosion properties of 7N01 aluminium alloy

作　　者：徐忠宣 姜海昌[2] 王昀立 张舵 胡小锋[2] 戎利建[2] XU Zhong-xuan;JIANG Hai-chang;WANG Yun-li;ZHANG Duo;HU Xiao-feng;RONG Li-jian(CRRC Qingdao Sifang Co.,Ltd.,Qingdao 266111,China;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Science,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中车青岛四方股份有限公司,山东青岛266111 [2]中国科学院金属研究所中国科学院核材料腐蚀与防护重点实验室,辽宁沈阳110016 [3]中国科技大学材料科学院与工程学院,安徽合肥230026

出　　处：《塑性工程学报》2019年第4期200-206,共7页Journal of Plasticity Engineering

基　　金：国家重点研究发展计划项目(2016YFB1200501);中国科学院战略性先导科技专项(XDB22020200)

摘　　要：选取3种不同的挤压比10、22和35,研究了挤压比对7N01铝合金微观组织、力学性能以及应力腐蚀性能的影响规律。研究结果表明:随着挤压比的增加,合金的晶粒尺寸变小,挤压条带宽度变窄,合金的时效响应速度加快,合金的强度显著提升。同时,在挤压温升和冷却速度的双重作用下,随着挤压比的增大,合金中过饱和固溶原子的数量增加,晶界析出相的连续性发生改变,形成不连续-略连续(细小)-不连续(粗大)的变化过程,由此导致合金的应力腐蚀指数随着挤压比的增大呈现先增加后减小的趋势,因此在实际生产时,应避开挤压比为22以内的范围。Three kinds of extrusion ratio of 10,22,35 were employed to investigate the effect of extrusion ratio on microstructure,me-chanical properties and stress corrosion properties.The results show that with the increase of extrusion ratio,the grain size of the alloy de-creases,the width of extrusion strip narrows,the aging response speed of the alloy increases,and the strength of the alloy increases signif-icantly.At the same time,under the co-effects of extrusion temperature rise and cooling rate,the number of supersaturated solid solution atoms increases,and the continuity of precipitated phases at grain boundaries changes from discontinuous,slightly continuous(fine)to discontinuous(coarse)with the increase of extrusion ratio,which results in stress corrosion index of the alloy showing a trends of increas-ing firstly and then decreasing.Therefore,the extrusion ratio of 22 or less should be avoided in industrial production.

关 键 词：挤压比 应力腐蚀开裂 7N01铝合金 时效硬化行为 

分 类 号：TG379[金属学及工艺—金属压力加工]