Er对多向锻造7050铝合金组织性能的影响  

Effect of Er on microstructure and properties of multi-directional forged 7050 aluminum alloy

作　　者：王华幸 荣莉[1] 黄晖[1] 魏午 王泽忠 周力 王猛 Wang Huaxing;Rong Li;Huang Hui;Wei Wu;Wang Zezhong;Zhou Li;Wang Meng(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Dongfeng Motor Group Co.,Ltd.,Wuhan Hubei 430056,China;Xi'an Aerospace Power Machinery Co.,Ltd.,Xi'an Shaanxi 710025,China)

机构地区：[1]北京工业大学材料与制造学部,北京100124 [2]东风汽车集团股份有限公司,湖北武汉430056 [3]西安航天动力机械有限公司,陕西西安710025

出　　处：《金属热处理》2023年第12期230-236,共7页Heat Treatment of Metals

基　　金：国家重点研发计划(2021YFB3700901)。

摘　　要：以7050铝合金及含Er7050铝合金(7E50)为研究对象,对两种铝合金自由锻件进行固溶、时效处理后,采用SEM、TEM与室温拉伸等测试手段研究铝合金锻件固溶及时效处理过程中组织和力学性能的演变规律。结果表明,两种合金经470℃×1 h固溶后,7050铝合金再结晶组织占比69.45%,而7E50合金再结晶占比仅为62.08%,Er元素的加入可以抑制合金的再结晶行为。最佳的单级时效工艺为120℃×24 h,经单级峰时效处理后7E50合金的强度、硬度、伸长率均高于7050合金,由此可见Er元素的加入可以有效提升合金的力学性能。7E50铝合金峰时效态下的析出相主要是η′相、GP区和Al3(Er,Zr)颗粒。两种合金晶界上析出相都呈链状连续分布,但7E50铝合金晶界析出相尺寸明显小于不含Er的7050合金,这可能是7E50合金伸长率高于7050合金伸长率的原因之一。7050 aluminum alloy and Er-containing 7050 aluminum alloy(7E50)were selected as the research object.After solution and aging treatment of free forgings of both aluminum alloys,the microstructure and mechanical properties were studied by means of SEM,TEM and room temperature tensile test.The results show that after 470℃×1 h solution treatment,the recrystallized fraction in the 7050 aluminum alloy is 69.45%,while that in the 7E50 alloy is only 62.08%,which shows that the addition of Er can inhibit the recrystallization behavior of the alloy.After the optimal single-stage peak aging process,that is 120℃×24 h,the strength,hardness and elongation of the 7E50 alloy are higher than that of the 7050 alloy,it can be seen that the Er addition can effectively improve the mechanical properties of the alloy.The precipitated phases of the 7E50 aluminum alloy are mainlyη′phase,GP region and Al_(3)(Er,Zr)particles.The grain boundary precipitated phases of the two alloys show a continuous chain distribution,but the size of grain boundary precipitated phases in the 7E50 alloy is significantly finer than that in the 7050 alloy,which may be one of the main reasons why the elongation of the 7E50 alloy is higher than that of the 7050 alloy.

关 键 词：7E50铝合金 多向锻造 热处理 组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]