Al-Cu-Sn合金WAAM堆积体的组织与性能  

Microstructure and Mechanical Properties of an Al-Cu-Sn Wall Deposited by Wire+Arc Additive Manufacturing

作　　者：王帅 顾惠敏 王伟 李承德 任玲玲 王振飚 翟玉春 马培华 Wang Shuai;Gu Huimin;Wang Wei;Li Chengde;Ren Lingling;Wang Zhenbiao;Zhai Yuchun;Ma Peihua(College of Metallurgy,Northeastern University,Shenyang 110819,China;Inner Mongolia Metal Material Research Institute,Inner Mongolia 014000,China;Fushun Dong gong Metallurgical Materials and Technology Limited Company,Fushun 113000,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]内蒙古金属材料研究所,内蒙古包头014000 [3]抚顺东工冶金材料技术有限公司,辽宁抚顺113000

出　　处：《稀有金属材料与工程》2021年第1期95-101,共7页Rare Metal Materials and Engineering

基　　金：National Key R&D Program of China(2018YFB1106300-5)。

摘　　要：Al-Cu合金ZL205A电弧熔丝增材制造(WAAM)堆积体具有良好的综合力学性能,但在增材过程中产生有毒的氧化镉。本研究以Sn替换Cd,通过金相、SEM、EDS、TEM及拉伸试验,考察堆积体的微观组织和力学性能,并与ZL205A合金堆积体进行对比。结果发现,Al-Cu-Sn合金堆积体表面平整,呈现出银白色光泽,Sn元素的烧损率为5.9%。WAAM Al-Cu-Sn合金堆积体直接堆积态晶粒细小、均匀,晶粒尺寸约为30μm,小于ZL205A合金堆积体的晶粒尺寸,主要析出相在晶内和晶界上均匀分布。T6热处理后,θ相完全固溶到Al基体中,在晶界上均匀分布着复熔T相和Sn与Al2Cu的细小共生相,TEM显示晶内弥散分布大量的θ′相。T6热处理后,Al-Cu-Sn合金的力学性能为:抗拉强度493 MPa;屈服强度434 MPa;延伸率9.5%。该合金在WAAM过程中表现出了优异的性能,具有广泛的应用前景。The Al-Cu alloy walls(ZL205A)produced by wire+arc additive manufacturing(WAAM)have good mechanical properties,but toxic cadmium oxide is generated during production.Therefore,to prevent the generation of cadmium oxide,Cd was replaced by Sn in the Al-Cu alloy(ZL205A)in the present paper.The microstructure and mechanical properties of Al-Cu-Sn alloy and the ZL205A alloy walls in as-deposited and T6 state were investigated and compared by conducting metallographic,scanning electron microscopy,energy dispersive spectroscopy,transmission electron microscopy,and tensile tests.The surface of the Al-Cu-Sn alloy wall is smooth and exhibits a silver-white luster,and the burning loss rate of Sn is 5.9%.The grains of the WAAM Al-Cu-Sn alloy wall are fine and uniform,which are smaller than these of the ZL205A alloy wall.The main precipitated phases are uniformly distributed among the grains or on the grain boundaries.Following T6 heat treatment,theθphases are completely dissolved in the Al matrix,and the re-melted T phases and small co-phases of Sn and Al2Cu are uniformly distributed on the grain boundaries.The TEM results show that a large number ofθ'phases are dispersed among the grains.The mechanical properties of the Al-Cu-Sn alloy after heat treatment are as follows:tensile strength 493 MPa,yield strength 434 MPa,and elongation rate 9.5%.The alloy shows excellent performance in WAAM process and has broad application prospects.

关 键 词：Al-Cu-Sn合金 WAAM 组织 性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]