Al对激光熔化沉积VCoNi系中熵合金组织与性能的影响  

Effect of Al on microstructure and mechanical properties of medium entropy alloy in VCoNi system by laser melting deposition

作　　者：喻会 赵琳[1] 彭云[1] 曹洋[1] 马成勇[1] 田志凌[1] YU Hui;ZHAO Lin;PENG Yun;CAO Yang;MA Chengyong;TIAN Zhiling(Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司,北京100081

出　　处：《粉末冶金工业》2024年第2期69-74,共6页Powder Metallurgy Industry

基　　金：国家重点研发计划资助项目(2021YFB3702500);钢铁研究总院有限公司自主投入研发专项(事23H60440ZD)。

摘　　要：采用激光熔化沉积技术(Laser Melting Deposition,LMD)制备了VCoNi和Al_(7)(VCoNi)_(93)中熵合金,研究了中熵合金显微组织和力学性能。结果表明,VCoNi中熵合金为单一的FCC固溶体结构,而Al_(7)(VCoNi)_(93)中熵合金为FCC+BCC双相固溶体结构,Al元素促进了BCC结构的形成。Al对VCoNi系中熵合金力学性能的影响显著,提高了合金硬度和强度,而降低了塑性和韧性。与VCoNi中熵合金比较,Al_(7)(VCoNi)_(93)中熵合金显微硬度由317HV_(0.1)增加至370HV_(0.1),抗拉强度由964 MPa增大至1138 MPa,而室温冲击韧性值由88 J/cm^(2)降低至60.5 J/cm^(2)。VCoNi and Al_(7)(VCoNi)_(93) medium entropy alloys were manufactured by Laser Melting Deposition(LMD),and the microstructure and mechanical properties of the medium entropy alloys were investigated.The results show that the VCoNi medium entropy alloy is a single FCC solid solution structure,while the Al_(7)(VCoNi)_(93) medium entropy alloy is an FCC+BCC duplex solid solution structure,and the Al element promotes the formation of BCC structure.The influence of Al on the mechanical properties of VCoNi alloy is significant,which increases the hardness and strength of the medium entropy alloy,but decreases the ductility and toughness.Compared with VCoNi,the microhardness of Al_(7)(VCoNi)_(93) increases from 317HV_(0.1) to 370HV_(0.1),the tensile strength increases from 964 MPa to 1138 MPa,and the impact toughness decreases from 88 J/cm^(2) to 60.5 J/cm^(2) at room temperature.

关 键 词：VCoNi中熵合金 激光熔化沉积 Al合金化 微观组织 力学性能 

分 类 号：TG139[一般工业技术—材料科学与工程] TG665[金属学及工艺—合金]