基于d电子理论的Ti-Nb-Cu三元形状记忆合金性能优化  

Performance optimization of ternary Ti−Nb−Cu shape memory alloys based on d electron theory

作　　者：衣晓洋 曹新建 黄博文 孙馗善 孙斌 孟祥龙[3] 高智勇[3] 王海振 Xiao-yang YI;Xin-jian CAO;Bo-wen HUANG;Kui-shan SUN;Bin SUN;Xiang-long MENG;Zhi-yong GAO;Hai-zhen WANG(College of Nuclear Equipment and Nuclear Engineering,Yantai University,Yantai 264005,China;Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing,Yantai 264005,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Center of Testing and Analysis,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]烟台大学核装备与核工程学院,烟台264005 [2]山东省烟台先进材料与绿色制造实验室,烟台264005 [3]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [4]哈尔滨工程大学材料科学与化学工程学院分析测试中心,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第3期861-873,共13页中国有色金属学报（英文版）

基　　金：partial financial support from the National Natural Science Foundation of China (No. 52101231);the Science Fund of Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing,China (No. AMGM2021F09);the Natural Science Foundation of Shandong Province,China (No. ZR2021QE044)。

摘　　要：基于d电子理论设计Ti-Nb-Cu形状记忆合金的相组成,以优化其性能。XRD分析和TEM观察表明,Cu添加导致键级(Bo)和金属d轨道能级(Md)值减小,从而使相组成发生演变。随着Cu含量的增加,相组成的变化可以总结如下:β+α"→β+ω→β+α"+ω→β。随着Cu含量的增加,Ti-Nb-Cu形状记忆合金的屈服强度、极限抗拉强度和伸长率均呈先增大后减小的趋势。通过优化Cu合金元素含量,Ti-Nb-Cu形状记忆合金具有优异的力学性能,其屈服强度为528 MPa,极限抗拉强度为742 MPa,这主要归因于固溶强化、晶粒细化以及析出强化的综合作用。The phase constituents of Ti-Nb-Cu shape memory alloys were designed based on d electron theory,in order to optimize their performances.The XRD analysis and TEM observation revealed that Cu addition led to the reduction of the bond order(Bo)and metal d-orbital energy level(Md),which caused the evolution of phase constituents.With increasing Cu content,the variation of phase constituents can be concluded as follows:β+αʺ→β+ω→β+αʺ+ω→β.The yield strength,ultimate tensile strength and elongation of Ti-Nb-Cu shape memory alloys firstly increased and then decreased with increasing Cu contents.By optimizing the content of Cu alloying element,Ti-Nb-Cu shape memory alloys possess superior mechanical properties with yield strength of 528 MPa and ultimate tensile strength of 742 MPa,which can mainly be attributed to the comprehensive effect of solution strengthening and grain refinement as well as precipitation strengthening.

关 键 词：d电子理论 Ti-Nb-Cu形状记忆合金 马氏体组态 拉伸性能 显微硬度 

分 类 号：TG139.6[一般工业技术—材料科学与工程]