AlCoCrFeNi_(2.1)共晶高熵合金电子束焊接头的组织和力学性能研究  

Study on Microstructure and Mechanical Properties of AlCoCrFeNi_(2.1) Eutectic High Entropy Alloy Electron Beam Welded Joint

作　　者：苏侃 顾泽昊 农智升 徐荣正 SUKan;GUZehao;NONGZhisheng;XURongzheng(School of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学材料科学与工程学院,辽宁沈阳110136

出　　处：《热加工工艺》2025年第7期19-23,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51701128);辽宁省“兴辽英才计划”项目(XLYC2007075)。

摘　　要：AlCoCrFeNi_(2.1)共晶高熵合金是一种兼顾良好强韧性和高温性能的合金。为了探究电子束焊接在该合金使用中的潜力,研究了电子束流对3.5mm厚接头形貌的影响,分析了焊接接头的微观结构和力学性能,获得了最优的电子束焊工艺参数。结果表明,与母材相比,焊缝区的层状组织更为细小但具有一定取向。由于焊缝区的元素富集减弱,并且晶粒尺寸减小,因此硬度也比母材高。焊接接头的抗拉强度和伸长率分别为873MPa和21.8%,在熔合线处发生断裂,这是因为该处存在软化现象。AlCoCrFeNi_(2.1) eutectic high-entropy alloy is an alloy with good toughness and high temperature properties.In order to investigate the potential of electron beam welding in the field of the alloy,the effect of the variation of electron beam current on the morphology of the joint with the thickness of 3.5 mm was studied,the microstructure and mechanical properties of the welded joint were analyzed,and the optimal electron beam welding process parameters were obtained.The results show that compared with the base material(BM),the weld zone(WZ)has finer lamellar microstructure,but the structure has a certain orientation.The hardness is also increased compared to that of the BM due to the weakened elemental enrichment of WZ and the reduction of grain size.The tensile strength and elongation of the welded joint are 873 MPa and 21.8%,respectively.The fracture occurs at the fusion line,and the softening problem occurs at the position.

关 键 词：高熵合金 电子束焊 微观结构 力学性能 

分 类 号：TG456.3[金属学及工艺—焊接]