摘要
通过冷坩埚悬浮感应熔炼、轧制和固溶热处理制备Ti-8Mo-2Zr、Ti-8Mo-4Nb-2Zr和Ti-8Mo-4Nb-2Zr-2Ta(原子分数/%)钛合金,研究了铌和钽元素的添加对合金显微组织、拉伸性能和变形机制的影响。结果表明:3种合金的组成相均为单一β相,β相晶粒尺寸随着铌、铌+钽元素的添加逐步减小;Ti-8Mo-2Zr合金的变形机制以应力诱发α″马氏体相变和{332}孪生为主,而Ti-8Mo-4Nb-2Zr和Ti-8Mo-4Nb-2Zr-2Ta合金的变形机制以位错滑移为主;变形机制的转变导致合金强度的提高和塑性的降低,铌和钽元素添加产生的细晶强化和固溶强化效应进一步提高了合金的强度,Ti-8Mo-4Nb-2Zr-2Ta合金的抗拉强度高达970 MPa。
Ti-8 Mo-2 Zr,Ti-8 Mo-4 Nb-2 Zr and Ti-8 Mo-4 Nb-2 Zr-2 Ta(atom fraction/%)alloys were prepared by cold crucible induction levitation melting,rolling and solution treatment.The effects of Nb and Ta additions on the microstructure,tensile properties and deformation mechanism of the alloys were investigated.The results show that only one singleβphase existed in all the three alloys.Theβphase grain size decreased in turn with addition of Nb and Nb+Ta.Ti-8 Mo-2 Zr alloy deformed mainly by stress-inducedα″martensitic transformation and{332}twinning,while only dislocation slip appeared in the Ti-8 Mo-4 Nb-2 Zr and Ti-8 Mo-4 Nb-2 Zr-2 Ta alloys.The change of deformation mechanisms led to the increase in alloy strength and decrease in ductility.The grain refinement strengthening effect and the solution strengthening effect produced by additions of Nb and Ta further improved the strength of the alloy;the tensile strength of the Ti-8 Mo-4 Nb-2 Zr-2 Ta alloy was as high as 970 MPa.
作者
王敏
LU Liming
王长浩
李乾利
尤静林
WANG Min;LU Liming;WANG Changhao;LI Qianli;YOU Jinglin(State Key Laboratory of Advanced Special Steel,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;CSIRO Mineral Resources,Technology Court,Pullenvale,Queensland 4069,Australia;Key Laboratory of Infrared Imaging Materials and Detectors,Shanghai Institute of Technical Physics Chinese Academy of Sciences,Shanghai 200083,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2022年第1期14-18,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51271107)
中国博士后科学基金资助项目(2019M661460)。
关键词
Β钛合金
变形机制
拉伸性能
β-Ti alloy
deformation mechanism
tensile property
