Zr、O元素固溶强化对钛合金力学性能各向异性的影响  

Effect of Zr and O Solution Strengthening on the Anisotropy of Mechanical Properties of Ti Alloys

作　　者：费峻桢 王小祥[1] FEI Junzhen;WANG Xiaoxiang(School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学材料科学与工程学院,浙江杭州310027

出　　处：《材料科学与工程学报》2024年第6期888-896,904,共10页Journal of Materials Science and Engineering

基　　金：浙江省科技厅重点研发计划项目(2019C03081)。

摘　　要：力学性能的各向异性深刻影响着钛合金在牙种植体上的应用。本研究对具有强烈(0001)面织构的Ti-16 wt%Zr-0.3 wt%O钛合金和Ti-0.6 wt%O高氧钛板材进行了不同方向的常温单轴拉伸、压缩实验,采用X射线衍射(XRD)、金相以及电子背散射衍射(EBSD)分析,对比研究了Zr和O元素对钛合金力学性能各向异性的影响。结果表明:Zr+O元素复合强化(Ti-16Zr-0.3O)和高O强化(Ti-0.6O)均能显著提高位错柱面滑移临界分切应力(CRSS)。高O强化抑制变形孪晶,等比例提高位错柱面滑移和<c+a>位错锥面滑移CRSS,减弱了Ti-0.6O力学性能的各向异性。Zr+O元素协同强化则促进拉伸孪晶,大幅提高<c+a>锥面位错滑移CRSS,加强了Ti-16Zr-0.3O各向异性。The anisotropy of mechanical properties greatly affects the application of titanium alloys in dental implants.In this study,uniaxial tensile and compression experiments of Ti-16 wt%Zr-0.3 wt%O and Ti-0.6 wt%O high oxygen titanium plates with strong(0001)surface texture were carried out in different directions.The effects of zirconium and oxygen on the mechanical anisotropy of titanium alloys were studied by XRD,metallography and EBSD analysis.The results show that both Zr+O composite strengthening(Ti-16Zr-0.3O)and high O strengthening(Ti-0.6O)can significantly increase the critical resolved shear stress(CRSS)of thedislocation prismatic slip.High O strengthening inhibits deformation twins,increases CRSS of theprismatic slip and pyramidal<c+a>slip in equal proportion,which makes the anisotropy of mechanical properties of Ti-0.6O relatively mild.The co-strengthening of Zr+O elements promotes the formation of a large number of tensile twins,greatly increases CRSS of the pyramidal<c+a>slip,resulting in strong anisotropy of Ti-16Zr-0.3O.

关 键 词：钛合金 锆元素 氧元素 力学性能 各向异性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]