Ti元素对σ(FeV)物相稳定性的影响  

Effects of Ti element on phase stability ofσ(FeV)

作　　者：谢毅[1] 鲜勇[2] 冯龙 Xie Yi;Xian Yong;Feng Long(School of Automotive Engineering,Chongqing Three Gorges Vocational College,Wanzhou 404000,Chongqing,China;School of Materials and Environmental Engineering,Chengdu Technological University,Chengdu 611730,Sichuan,China)

机构地区：[1]重庆三峡职业学院汽车工程学院,重庆万州404000 [2]成都工业学院材料与环境工程学院,四川成都611730

出　　处：《钢铁钒钛》2021年第5期42-46,共5页Iron Steel Vanadium Titanium

摘　　要：为研究大尺寸过渡金属元素Ti对σ(FeV)物相稳定性的影响,通过电弧熔炼的方法制备了不同Ti含量的FeV合金,对其进行了物相鉴定和显微硬度分析。结果表明:随Ti含量从5%增加至15%,合金物相逐步从复杂结构的σ(FeV)物相转变为简单的体心立方α(FeV),由于Ti原子的固溶强化以及后续的σ→α相变,显微硬度呈现出先升高后降低的变化规律。Ti元素的引入降低了σ(FeV)物相的稳定性,抑制σ相的形成,原因在于随Ti含量增加,Ti元素削弱了σ相中d-d电子共价键合的主导地位,且更有利于形成配位数16的配位多面体,不满足形成σ(FeV)相的几何尺寸要求。In order to study the effect of large-size transition-metal element Ti onσ(FeV).FeV alloys with different Ti contents were prepared by arc melting,and phase identification and microhardness testing were conducted.The results show that with the increase of Ti concentration from 5%to 15%,the phase of the alloy gradually changes from complex structureσ(FeV)into simple bcc phaseα(FeV).It shows that microhardness increases first and then decreases due to the solid solution strengthening of Ti atoms and subsequentσ→αphase transition.The introduction of Ti reduces the phase stability ofσ(FeV),and inhibits the formation ofσ(FeV)phase.With the increase of Ti content,Ti decreases the dominating d-d electron covalent bonding inσphase and promotes the formation of coordination polyhedron with coordination number of 16,which does not meet the geometric requirements for the formation ofσphase.

关 键 词：钒铁 Σ相 Ti元素 硬度 稳定性 

分 类 号：TF823[冶金工程—有色金属冶金] TF841.3