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

作者机构：State Key Laboratory of Advanced Welding and JoiningHarbin Institute of TechnologyHarbin 150001China School of Material Science and EngineeringHarbin University of Science and TechnologyHarbin 150040China 

出 版 物：《China Welding》 (中国焊接（英文版）)

年 卷 期：2023年第32卷第4期

页      面：1-10页

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

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) 

主　　题：Wire arc additive manufacturing Al-Cu-Ag-Sc heat resistance microstructure high temperature property 

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 ***,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 *** 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 ***,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 *** microstructures and high temperature tensile properties are *** results show that the as-deposited 2319Ag Sc alloy presents an alternate distribution of columnar grains and equiaxed grains with no significant *** 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 *** manufacturing,nanoscale Al_(2)Cu can precipitate out from the *** and Mg form nano-scaleΩphase on the Al_(2)Cu *** 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.