固溶处理对7175铝合金组织和力学性能的影响  

Effect of solution treatment on microstructure and mechanical properties of 7175 aluminum alloy

作　　者：赵忠超 汲庆涛 曹善鹏 唐和壮 李宾良 牛博雅 孙有政 Zhao Zhongchao;Ji Qingtao;Cao Shanpeng;Tang Hezhuang;Li Binliang;Niu Boya;Sun Youzheng(National Aluminum Alloy Pressure Processing Engineering Technology Research Center,Shandong Nanshan Aluminum Industry Co.,Ltd.,Longkou Shandong 264000,China;Shandong Aluminum Alloy Pressure Processing Technology Innovation Center,Shandong Nanshan Institute of Science and Technology Co.,Ltd.,Longkou Shandong 264000,China;AVIC Xi'an Aircraft Industry Group Co.,Ltd.,Xi'an Shaanxi 710089,China;School of Materials Science and Engineering,Yantai Nanshan University,Longkou Shandong 264000,China)

机构地区：[1]山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心,山东龙口264000 [2]山东南山科学技术研究院有限公司山东省铝合金压力加工技术创新中心,山东龙口264000 [3]中航西安飞机工业集团股份有限公司,陕西西安710089 [4]烟台南山学院材料科学与工程学院,山东龙口264000

出　　处：《金属热处理》2024年第5期186-192,共7页Heat Treatment of Metals

摘　　要：通过拉伸性能测试、硬度测试、光学显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)研究了固溶处理工艺对7175铝合金微观组织和性能的影响。结果表明,当7175铝合金在485℃×3.5 h固溶时,第二相逐渐减少,晶粒有粗化趋势;在475℃×2.5 h固溶时,MgZn2相会依托含Cr相在晶界处形核,起到钉扎晶界作用,抑制晶粒长大。同时,随着固溶温度的升高和固溶时间的延长,经120℃×12 h+165℃×5.5 h双级时效处理后的7175铝合金抗拉强度、显微硬度出现先升高后降低的趋势,当固溶处理工艺为475℃×2.5 h时,其抗拉强度为631.2 MPa,屈服强度为555.7 MPa,伸长率为12.5%,综合力学性能最佳。Effect of solution treatment process on microstructure and properties of 7175 aluminum alloy was investigated through tensile property testing,hardness testing,optical microscope(OM),scanning electron microscope(SEM)and transmission electron microscope(TEM).The results show that when the 7175 aluminum alloy is solution treated at 485℃for 3.5 h,the second phase contont gradually decreases,and there is a tendency for grain coarsening.When the 7175 aluminum alloy is solution treated at 475℃for 2.5 h,MgZn2 phase will rely on the Cr containing phase to nucleate at the grain boundary,playing a role in pinning the grain boundary and inhibiting grain growth.At the same time,with the increase of solution temperature and time,the tensile strength and microhardness of the alloy after aging at 120℃for 12 h and 165℃for 5.5 h show a trend of first increasing and then decreasing.When the solution treatment process is 475℃×2.5 h,the tensile strength is 631.2 MPa,the yield strength is 555.7 MPa and the elongation is 12.5%,with the optimal comprehensive mechanical properties.

关 键 词：铝合金 微观组织 固溶处理 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]