变形诱导析出相实现Ti45Zr40Al5Nb5V5轻质高熵合金强塑性协同提升
Improvement of Deformation Induced Precipitation Phase on Strength and Plasticity of Ti45Zr40Al5Nb5V5 Lightweight High Entropy Alloy
冯向向 1张朝晖 2何杨宇 1贾晓彤 1王强 1刘娅 1程兴旺 2刘迪3
作者信息
- 1. 北京理工大学材料学院 北京 100081
- 2. 北京理工大学材料学院 北京 100081;北京理工大学唐山研究院唐山市特种金属与陶瓷材料重点实验室 唐山 063000
- 3. 航天科工防御技术研究试验中心 北京 100854
- 折叠
摘要
钛基高熵合金具有比强度高,低密度等优越性能,被军工业和科研界广泛关注.然而,如何寻找并通过改进加工手段获取兼顾强度和塑性的钛基高熵合金材料,建立起加工方式、材料微观组织和力学性能之间的联系仍需深入研究.文章通过真空悬浮熔炼制备了一种密度为5.6 g/cm3的新型高熵合金Ti45Zr40Al5Nb5V5,进一步采用多级轧制法强化并增韧合金.研究发现多级轧制诱导了 Ti45Zr40Al5Nb5V5合金中B2和HCP析出相的形成.同时将晶粒尺寸由387 μm减小到89.5 µm.析出相和细晶强化相结合的方式协同提高了 Ti45Zr40Al5Nb5V5材料的强度和塑性,材料的拉伸屈服强度提升了 35.2％至1149 MPa,延展性提升到10％,相较于铸态合金提升了 34.0％.
Abstract
Titanium-based high-entropy alloys with superior properties such as high specific strength and low density have received much attention from the military industry and scientific research community.However,how to find and obtain titanium-based high-entropy alloy materials with both strength and plasticity through improved processing,and how to establish a relationship between processing methods,material microstructure and mechanical properties still need in-depth research.In this study,a new high-entropy alloy Ti45Zr40Al5Nb5V5 with a density of 5.6 g/cm3 was prepared by vacuum suspension melting,and the alloy was further strengthened and toughened by multi-stage rolling.It was found that multi-stage rolling induced the formation of B2 and HCP precipitated phases in Ti45Zr40A15Nb5V5 alloy.The combination of precipitated phases and fine grain strengthening synergistically increased the strength and plasticity of Ti45Zr40Al5Nb5V5 material,and the tensile yield strength of the material was increased by 35.2％to 1,149 MPa,while the ductility of the material was increased by 34.0％to 10％.
关键词
轻质高熵合金/析出相强化/微观组织/力学性能Key words
Lightweight high-entropy alloys/Precipitation phase strengthening/Microstructure/Mechani-cal properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据