Wire arc additive manufacturing of a heat-resistant Al-Cu-Ag-Sc alloy:microstructures and high-temperature mechanical properties  

作　　者：董博伦 蔡笑宇 夏云浩 刘放 赵宏伟 林三宝 戴鸿滨 Dong Bolun;Cai Xiaoyu;Xia Yunhao;Liu Fang;Zhao Hongwei;Lin Sanbao;Dai Hongbin(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China)

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China [2]School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China

出　　处：《China Welding》2023年第4期1-10,共10页中国焊接（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.U21B2080,52305351,52275324);the China Postdoctoral Science Foundation(Grant No.2023M730838);the Heilongjiang Provincial Postdoctoral Science Foundation(Grant No.LBH-Z22128);the Natural Science Foundation of Heilongjiang Province(Grant No.LH2023E039).

摘　　要：With a high energy efficiency,low geometric limitation,and low cracking susceptivity to cracks,wire arc additive manufacturing(WAAM)has become an ideal substitute for casting in the manufacturing of load-bearing high strength aluminum components in aerospace industry.Recently,in scientific researches,the room temperature mechanical performance of additive manufactured high strength aluminum alloys has been continuously broken through,and proves these alloys can achieve comparable or even higher properties than the forged counterpart.Since the aluminum components for aerospace usage experience high-low temperature cycling due to the absence of atmosphere protection,the high temperature performances of additive manufactured high strength aluminum alloys are also important.However,few research focuses on that.A special 2319Ag Sc with 0.4 wt.%Ag and 0.2 wt.%Sc addition designed for high temperature application is deposited successfully via cold metal transfer(CMT)based on WAAM.The microstructures and high temperature tensile properties are investigated.The results show that the as-deposited 2319Ag Sc alloy presents an alternate distribution of columnar grains and equiaxed grains with no significant textures.Main second phases are Al_(2)Cu and Al3Sc,while co-growth of Al_(2)Cu and bulk Al_(3)Sc is found on the grain boundary.During manufacturing,nanoscale Al_(2)Cu can precipitate out from the matrix.Ag and Mg form nano-scaleΩphase on the Al_(2)Cu precipitates.At 260℃,average yield strengths in the horizontal direction and vertical direction are 87 MPa±2 MPa,87 MPa±4 MPa,while average ultimate tensile strengths are 140 MPa±7 MPa,141 MPa±11 MPa,and average elongations are 11.0%±2.5%,13.5%±3.0%.Anisotropy in different directions is weak.

关 键 词：Wire arc additive manufacturing Al-Cu-Ag-Sc heat resistance microstructure high temperature property 

分 类 号：TG146.21[一般工业技术—材料科学与工程]