Ti含量对Fe_(1.4)Co_(0.8)Ni_(0.8)CrTi_(x)高熵合金微观结构及其力学性能的影响  

Effects of Ti Content on Microstructure and Mechanical Properties of High Entropy Alloys Fe_(1.4)Co_(0.8)Ni_(0.8)CrTi_(x)

作　　者：杨泽晨 刘晓艳 朱和国[1] YANG Zechen;LIU Xiaoyan;ZHU Heguo(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094

出　　处：《热加工工艺》2025年第4期108-111,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51571118)。

摘　　要：运用真空感应熔炼法,制备了不同Ti含量的高熵合金Fe_(1.4)Co_(0.8)Ni_(0.8)CrTi_(x)(x=0,0.1,0.2,0.25,0.3),研究了Ti含量对Fe_(1.4)Co_(0.8)Ni_(0.8)CrTi_(x)高熵合金微观结构及其力学性能的影响。结果表明,不同Ti含量高熵合金Fe_(1.4)Co_(0.8)Ni_(0.8)CrTi_(x)均为FCC单相固溶体,显微组织呈现出典型的枝晶和枝晶间结构。随着Ti含量的增加,富含Ti元素的析出相部分明显增多,极限抗拉强度先提高后降低,伸长率逐渐下降,断裂方式由韧性断裂转变为解理断裂。未添加Ti时,Fe_(1.4)Co_(0.8)Ni_(0.8)Cr的极限抗拉强度为523 MPa。当x增至0.25时,Fe_(1.4)Co_(0.8)Ni_(0.8)CrTi_(0.25)的极限抗拉强度逐渐提高至957 MPa,伸长率为30.7%,表现为韧性断口。当x进一步提高至0.3时,其极限抗拉强度基本不变,伸长率降至18%,断口出现解理面断裂。Fe_(1.4)Co_(0.8)Ni_(0.8)CrTi_(x)(x=0,0.1,0.2,0.25,0.3)high entropy alloys with different Ti contents were synthesized by vacuum induction melting.The effects of Ti content on the microstructure and mechanical properties of Fe_(1.4)Co_(0.8)Ni_(0.8)CrTi_(x)high entropy alloys were investigated.The results show that Fe_(1.4)Co_(0.8)Ni_(0.8)CrTi_(x)high entropy alloys with different Ti contents are FCC single-phase solid solution.The microstructure displays typical dendrite and interdendritic structure.As Ti content increases,the precipitated phase rich in Ti increases obviously.The ultimate tensile strength first increases and then decreases,while the percent elongation gradually decreases.The fracture pattern transits from the ductile to cleavage fracture.When Ti is not added,the ultimate tensile strength of Fe_(1.4)Co_(0.8)Ni_(0.8)Cr is 523 MPa.When x increases to 0.25,the ultimate tensile strength of Fe_(1.4)Co_(0.8)Ni_(0.8)CrTi_(0.25)gradually increases to 957 MPa,and the percent elongation is 30.7%,showing a ductile fracture.When x further increases to 0.3,the ultimate tensile strength is basically unchanged,the percent elongation reduces to 18%,and the fracture generates a cleavage fracture.

关 键 词：高熵合金 微观结构 力学性能 固溶强化 

分 类 号：TG139[一般工业技术—材料科学与工程]