Mo对铸态(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(98-x)C_(2)Mo_(x)多主元合金组织及性能的影响  

Effect of Mo on microstructure and properties of as-cast(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(98-x)C_(2)Mo_(x) multi-principal element alloy

作　　者：赵雪柔 吕煜坤[2] 武上焜 李双元 ZHAO Xue-rou;L Yu-kun;WU Shang-kun;LI Shuang-yuan(School of Railway Equipment Manufacturing,Shaanxi Railway Institute,Weinan 714000,China;School of Materials Science and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China)

机构地区：[1]陕西铁路工程职业技术学院铁道装备制造学院,陕西渭南714000 [2]西安工业大学材料与化工学院,陕西西安710021

出　　处：《塑性工程学报》2024年第5期163-170,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金面上资助项目(52071251);陕西省教育厅专项科研计划项目(21JK0584);青年科学基金资助项目(51901167)。

摘　　要：采用真空电弧熔炼炉制备了铸态(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(98-x)C_(2)Mo_(x)多主元合金,分析了Mo的添加对铸态多主元合金组织和性能的影响,研究了多主元合金的强韧性和微观结构演变机制。结果表明,铸态(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(97)C_(2)Mo_(1)合金为面心立方相结构,室温拉伸变形过程中60°<111>变形孪晶增多,诱发孪晶诱导塑性(TWIP)效应,铸态合金在晶界强化(孪晶晶界为亚晶界)、固溶强化(C-间隙原子、Mo-置换原子)、位错强化以及TWIP效应的共同作用下,极限抗拉强度达到712.08 MPa,总伸长率为98.63%,强塑积高达70.23 GPa·%。随着Mo含量增加至2%,小角度晶界向大角度晶界转变程度变小,同时合金中析出白色颗粒状金属间化合物,致使合金的屈服强度、抗拉强度和塑性均降低。The as-cast(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(98-x)C_(2)Mo_(x) multi-principal element alloys was prepared by vacuum arc melting furnace.The effects of Mo addition on the microstructure and propeties of as-cast multi-principal element alloy were analyzed,and the strength toughness and microstructure evolution mechanism of multi-principal element alloys were studied.The results show that as-cast(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(98)C_(2)Mo_(1) alloy is face-centered cubic phase structure.During the tensile deformation process at room temperature,the deformation twins of 60°<111>increases,which induces the twining induced plasticity(TWIP)effect.Under the combined action of grain boundary strengthening(twin grain boundaries are lineage boundary),solution strengthening(C-gap atom,Mo-substitutional atom),dislocation strengthening and TWIP effect,the ultimate tensile strength of as-cast alloy reaches 712.08 MPa and the overall elongation is 98.63%.The product of strength and elongation is as high as 70.23 GPa·%.As the Mo content increases to 2%,the transition degree from small angle grain boundary to large angle grain boundary is decreased,and white granular intermetallic compounds precipitate in the alloy,which leads to the decrease of the yield strength,tensile strength and plasticity of the alloy.

关 键 词：钼 强塑积 变形孪晶 TWIP效应 

分 类 号：TG145[一般工业技术—材料科学与工程]