医用钛合金表面纳米化组织与性能研究  

Study on the Microstructure and Mechanical Properties of Medical Titanium Alloy after Surface Nanocrystallization

作　　者：柴艳 于源[2,3] 王瑜 CHAI Yan;YU Yuan;WANG Yu(Shaanxi Shenghang Xincai Technology Co.,Ltd.,Xi'an 712000,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Qingdao Center of Resource Chemistry&New Materials,Qingdao 266000,China)

机构地区：[1]陕西盛航鑫材科技有限公司,陕西西安712000 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [3]青岛市资源化学与新材料研究中心,山东青岛266000

出　　处：《铸造技术》2024年第2期142-147,共6页Foundry Technology

基　　金：国家重点研发计划(2023YFB3405800);中国民航大学民航热灾害防控与应急重点实验室开放基金课题(RZH2021-KF-01);中国科学院青年创新促进会会员(2021423)。

摘　　要：针对近β型TLM钛合金试样表面进行了不同时间的高能喷丸处理,采用金相显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)以及显微硬度仪等对不同喷丸处理后的试样进行了组织观察和性能测试。研究发现,在喷丸的近表层发生了纳米化,形成了一定厚度的纳米晶层。喷丸处理时间越长,最表层的平均晶粒尺寸越小,晶粒尺寸沿着厚度方向有梯度变化,距喷丸表面越远,晶粒尺寸就会越大。同时纳米晶层的显微硬度相对于基体组织有大幅提高,显微硬度距表面距离越远,显微硬度越低,硬度的提升主要是由于表面晶粒细晶强化的作用所致。In this study,surface of type nearβ-type TLM titanium alloy samples were subjected to high-energy shot peening treatment at different time.The microstructure and mechanical properties of the samples after different shot peening time were observed using metallographic microscopy(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD),and microhardness testing.Research has shown that nanocrystallization occurs near the surface of samples after shot peening,forming a certain thickness of nanocrystalline layer.As the duration of the shot peening treatment increases,the average grain size of the surface layer decreases,and the grain size has a gradient change along the thickness direction.The further away from the shot peening surface,the larger the grain size will be.Moreover,compared with that of the matrix,the microhardness of the nanocrystalline layer significantly improves.The greater the distance from the surface is,the lower the microhardness.The increase in hardness is mainly due to the strengthening effect of surface grain refinement.

关 键 词：TLM钛合金 高能喷丸 表面纳米化 组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]