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 MechanicalProperties of Novel Near β Type Ti-10Mo-6Zr-4Sn-3Nb Alloyfor Biomedical Applications

作　　者：王鸿川 程军[2] 盖晋阳 杜赵新[4] 余森[2] 张亚峰[2] 麻西群[2] 宋宏杰 牛金龙[2] WANG Hongchuan;CHENG Jun;GAI Jinyang;DU Zhaoxin;YU Sen;ZHANG Yafeng;MA Xiqun;SONG Hongjie;NIU Jinlong(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Shaanxi Key Laboratory of Biomedical Metal Materials,Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China;State Key Laboratory of Powder Metallurgy,Powder Metallurgy Research Institute,Central South University,Changsha 410083,China;School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [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

出　　处：《热加工工艺》2024年第2期17-23,共7页Hot Working Technology

基　　金：国家自然科学基金项目(51901193);陕西省重点研发计划项目(2020GY-251);西安市科技计划项目(2020KJRC0141);西安市未央区科技计划项目(201905)。

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。The effects of pre-aging on the microstructural evolution and mechanical properties of a nearβtype Ti-10Mo-6Zr-4Sn-3Nb(Ti-B12)biomedical titanium alloy were investigated.The results show that a large number of ellipsoidal isothermalωphases are uniformly precipitated within the parentβphase 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 ofωphases 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 isothermalωtransitional phase assistedαphase nucleation and refinement,the higher density,smaller size and more dispersed distribution of secondaryαphases 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 secondaryαphases 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 

分 类 号：TG166.5[金属学及工艺—热处理]