异质双丝间接电弧增材制造Al-Mg-Cu合金组织与力学性能  

Microstructure and mechanical properties of Al-Mg-Cu alloy fabricated by heterogeneous twin-wire indirect arc additive manufacturing

作　　者：吴涛 谭振 王立伟[1,2] 梁志敏 汪殿龙[1,2] WU Tao;TAN Zhen;WANG Liwei;LIANG Zhimin;WANG Dianlong(Hebei University of Science and Technology,Shijiazhuang,050018,China;Hebei Key Laboratory of Material Near-Net Forming Technology,Shijiazhuang,050018,China)

机构地区：[1]河北科技大学,石家庄050018 [2]河北省材料近净成形技术重点实验室,石家庄050018

出　　处：《焊接学报》2023年第10期64-70,I0006,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51875168);河北省三三三人才工程资助项目(C20221022).

摘　　要：提出了一种新型异质双丝间接电弧增材制造(TWIA-AM)方法,同步送进ER2319和ER5356两种焊丝,制备了Al-3.5Mg-1.7Cu合金试样,并对沉积的Al-3.5Mg-1.7Cu铝合金试样的组织和力学性能进行了研究.结果表明,Al-3.5Mg-1.7Cu合金试样第二相主要由Al,Mg和Cu元素组成,为α-Al相和S相(Al2CuMg),晶粒形态在层间区域呈现粗大的柱状晶,层中心区域为等轴晶和细小的胞状晶组成;试样平均硬度为73.7HV,存在周期性低硬度区.试样平行增材方向(BD方向)、垂直于增材方向的平均抗拉强度和断后伸长率分别为225,235 MPa和9.0%,13.0%,力学性能表现为各向异性,观察断口形貌呈现典型的韧性断裂特征.创新点:提出了一种新型的异质双丝间接电弧增材制造方法,实现了Al-Mg-Cu合金的增材制造原位合成.A new heterogeneous twin-wire indirect arc additive manufacturing(TWIA-AM)method was proposed.The ER2319 wire and ER5356 wire were fed synchronously and Al-3.5Mg-1.7Cu alloy components were prepared.The microstructure and mechanical properties of the deposited Al-3.5Mg-1.7Cu alloy components were investigated.The results showed that the second phase composition of Al-3.5Mg-1.7Cu alloy was mainly Al,Mg and Cu,and consisted ofα-Al and S(Al2CuMg)phases.The grain morphology appeared as coarse columnar crystals at interlayer regions,and the center area of the layer is composed of equiaxed crystals and fine cellular crystals,and the layer center region was composed of equiaxed crystals and fine cellular crystals.The average microhardness of the sample is 73.7 HV with a periodic low hardness zone.The average tensile strength and elongation of the samples parallel to the building direction(BD direction)and perpendicular to the BD direction were 225,235 MPa,9.0%and 13.0%,respectively,exhibiting anisotropic mechanical properties.The fracture morphology exhibited the characteristics of typical plastic fracture.Highlights:A new heterogeneous twin-wire indirect arc additive manufacturing method is proposed,and additive manufacturing of Al-Mg-Cu alloy is achieved by in-situ synthesis.

关 键 词：双丝间接电弧 增材制造 Al-Mg-Cu合金 微观组织 力学性能 

分 类 号：TG444[金属学及工艺—焊接]