预时效热处理对新型近β医用Ti-10Mo-6Zr-4Sn-3Nb合金组织演变和力学性能的影响
Effects of Pre-aging Treatment on Microstructural Evolution and Mechanical Properties of Novel Near β Type Ti-10Mo-6Zr-4Sn-3Nb Alloy for Biomedical Applications
王鸿川 1程军 2盖晋阳 3杜赵新 4余森 2张亚峰 2麻西群 2宋宏杰 2牛金龙2
作者信息
- 1. 东北大学 材料科学与工程学院, 辽宁 沈阳 110819;西北有色金属研究院 陕西省医用金属材料重点实验室,陕西西安 710016
- 2. 西北有色金属研究院 陕西省医用金属材料重点实验室,陕西西安 710016
- 3. 中南大学 粉末冶金研究院, 粉末冶金国家重点实验室, 湖南 长沙 410083
- 4. 内蒙古工业大学材料科学与工程学院, 内蒙古 呼和浩特 010051
- 折叠
摘要
研究了预时效对一种近β型Ti-10Mo-6Zr-4Sn-3Nb(Ti-B12)医用钛合金组织演变和力学性能的影响.结果表明,在325、425℃分别预时效0.5～8.0 h后,在β母相中均匀析出了大量的椭球状等温ω相.随着预时效温度的升高和时间的延长,ω相的尺寸逐渐增大,而密度则逐渐减小.基于等温ω过渡相辅助α相形核与细化作用,在较低的预时效温度和较短的时间下可获得密度更高、尺寸更细小且弥散分布的次生α相.此外,经预时效后,通过显著细化次生α相的尺寸和提高α相的析出密度,强度得到了明显提升,并获得了较好的塑性.然而,当将预时效时间增加至一定值时,强化效应变得不再明显.
Abstract
The effects of pre-aging on the microstructural evolution and mechanical properties of a near β type Ti-10Mo-6Zr-4Sn-3Nb(Ti-B12)biomedical titanium alloy were investigated.The results show that a large number of ellipsoidal isothermal ω phases are uniformly precipitated within the parent β phase when the alloys are pre-aging treated at 325℃ and 425℃ with the holding time from 0.5 h to 8.0 h,respectively.The size of ω phases gradually increases and the density of them progressively decreases with the increase in the pre-aging temperature and holding time.Based on the effect of isothermal ω transitional phase assisted α phase nucleation and refinement,the higher density,smaller size and more dispersed distribution of secondary α phases can be obtained at the lower pre-aging temperature and shorter pre-aging time.Moreover,the strength can be improved and the better plasticity can be achieved via further refining the dimension and increasing the density of secondary α phases after pre-aging.However,the strengthening effect is no longer obvious when the pre-aging time increases to a certain value.
关键词
生物医用近β钛合金/组织演变/预时效热处理/力学性能Key words
biomedical near β Ti alloy/microstructural evolution/pre-aging treatment/mechanical properties引用本文复制引用
基金项目
国家自然科学基金(51901193)
陕西省重点研发计划(2020GY-251)
西安市科技计划(2020KJRC0141)
西安市未央区科技计划(201905)
出版年
2024
NETL
NSTL
万方数据