置氢对Ti-25Nb-10Ta-1Zr-0.2Fe合金室温组织和硬度的影响  

Influences of Hydrogenation on Room Temperature Microstructure and Hardness of Ti-25Nb-10Ta-1Zr-0.2Fe Alloy

作　　者：丁珣[1,2] 杨伏良[1,2,3] 胡建中[4] 洪天然[1,2] 许艳飞[1,2] 党小荔[1,2] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083 [3]湖南迈迪科新材有限公司,长沙410016 [4]中南大学湘雅医学院附属第一医院,长沙410008

出　　处：《材料导报》2012年第24期1-4,共4页Materials Reports

基　　金：国家863高新技术项目(2011AA030101);湖南省重点项目(2008WK2005)

摘　　要：利用光学显微镜、X射线衍射和扫描电镜等手段,研究了固态气体渗氢后氢元素对新型β医用钛合金Ti-25Nb-10Ta-1Zr-0.2Fe的相组成、微观组织和硬度的影响。研究结果表明,570℃置氢空冷,置氢量为0.2%(质量分数),合金发生共析反应βH→αH+δ。置氢后合金表面和内部显微组织出现差异:在合金表面,δ氢化物呈现针状,从晶界处生长,尺寸差异较大;在合金内部,氢化物δ呈细小针状,长度小于1μm,以α针为中心平行向外生长。置氢后合金硬度未增强。The hydrogenation experiments of Ti-25Nb-10Ta-1Zr-0. 2Fe alloy--a new β-medical titanium alloy were investigated through gas-solid hydrogenation method, in order to study the influence of hydrogen. The influences on phase composition, microstrueture evolution and hardness were investigated by the means of optical microscope （OP）, X-ray diffraction （XRD） and scanning electron microscope （SEM）. The results show that after hydrogenating at 570℃, the hydrogen absorption is 0. 2wt%. And in the next air cooling period, a euteetoid reaction occurs, βH→ aH＋δ. The surface and inner microstructures of hydrogenated alloy are different：the surface microstructure is consisted of abundant needle-like δ-hydrides growing from grain boundary whose sizes are obviously different, while inner microstructure is of vast weeny δ-hydrides, which are parallelly growing outward to the needlelike a-phase as the center. The hardness of the alloy does not increase through hydrogenation.

关 键 词：置氢 新型β钛合金 Ti-25Nb-10Ta-1Zr-0.2Fe 微观组织 硬度 

分 类 号：TG146.2[一般工业技术—材料科学与工程]