Al-Mn-Sc合金的选区激光熔化工艺优化及室温与高温力学性能研究  

Optimization of Selective Laser Melting Process for Al-Mn-Sc Alloy and Its Mechanical Properties at Room and High Temperature

作　　者：熊孝经 吴晓鹏 张唯 汤华平 XIONG Xiao-jing;WU Xiao-peng;ZHANG Wei;TANG Hua-ping(Jihua Laboratory,Foshan 528000,Guangdong,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;Guangdong Fenghua Zhuoli Co.,Ltd.,Foshan 528000,Guangdong,China)

机构地区：[1]季华实验室,广东佛山528200 [2]东北大学,辽宁沈阳110819 [3]广东峰华卓立股份有限公司,广东佛山528200

出　　处：《铸造》2024年第5期626-631,共6页Foundry

基　　金：季华实验室自立项目“航空级高强度铝合金粉末研制及低成本合金制粉技术研发(X200171TM200)”。

摘　　要：通过探究能量密度对Al-4.5Mn-1.5Mg-0.6Sc-0.2Zr(wt.%)合金致密度的影响,优化其成形工艺,并进一步分析该合金在时效过程中组织变化及其室温与高温力学性能。结果表明:随着能量密度增大,合金致密度先增后减。当能量密度为77.6 J/mm^(3)时,即激光功率275 W、扫描速率985 mm/s、扫描间距0.12 mm、层厚0.03 mm,可获得致密的、缺陷少的合金材料。沉积态合金显微组织由等轴晶和柱状晶组成,周围分布着细小富Mn相;300℃/5 h时效后,晶内析出大量纳米Al_(3)(Sc,Zr)相。同时,时效后合金表现出优异的室温与高温力学性能,其室温屈服强度、抗拉强度和伸长率分别是500 MPa、536 MPa和12.3%,高温(250℃)屈服强度、抗拉强度和伸长率分别为224 MPa、299 MPa和11.5%。This article examines the influence of energy density on the density of the Al-4.5Mn-1.5Mg-0.6Sc-0.2Zr alloy,introduces an improved forming methodology,and examines microstructural evolution and mechanical properties at room and high temperature.The results show that as energy density rises,the alloy density initially escalates before subsiding.When the energy density reached 77.6 J/mm^(3)(laser power 275 W,scanning speed 985 mm/s,scanning pitch 0.12 mm,and layer thickness 0.03 mm),defect-free dense alloys were realized.The as-deposited microstructure consists of equiaxed grains and columnar grains,encircled by Mn-rich phases.After aging treated at 300℃for 5 h,a large quantity of nano-sized Al_(3)(Sc,Zr)phase precipitates.Simultaneously,the aged alloy demonstrates outstanding mechanical properties,exhibiting room temperature yield strength,tensile strength,and elongation of 502.3 MPa,536.3 MPa,and 12.3%,respectively.At elevated temperatures(250℃),these remain at 223.5 MPa,299.1 MPa,and 11.5%,respectively.

关 键 词：选区激光熔化 Al-Mn-Sc 高温力学性能 

分 类 号：TG132.3[一般工业技术—材料科学与工程]