【作者】 王树林； 徐波； 李生娟； 李来强；

【Author】 WANG Shu-lin, XU Bo, LI Sheng-juan, LI Lai-qiang (Dept. Power Engineering, University of Shanghai for Science and Technology, Shanghai 200003, China)

【机构】 上海理工大学动力学院；

【摘要】 钛锆二元合金具有具有优良的生物体相容性和特殊的优秀品质,没有毒副作用,在生物医学材料方面具有重要应用前景,但迄今尚未见到用机械合金化方法合成钠米钛锆二元合金的报道．我们按照摩尔比1:1配制钛、锆粉末, 利用氩气保护,成功地在室温下进行了钛锆二元纳米合金的机械合金化首次尝试,生成合金的晶粒度在7．6nm．塑性变形在机械合金化过程中起着重要的桥梁作用．颗粒的细化使更多的原子集中到晶界上,加速了不同组分原子间的滑移和扩散．Ti的延展性优于Zr,故其颗粒细化相对较弱,而Zr颗粒细化较明显．细化的Zr颗粒不断在Ti上“着床”, Zr原子也不断向Ti滑移和扩散,最终形成了新的合金．更多还原

【Abstract】 Binary alloys of TiZr have excellent biocompatibility and unique properties without toxicity, and have found wide applications in biomaterials. However, pure nano-alloys of TiZr have not been successfully synthesized to date. For preparing the mixture powders of Ti and Zr with molar ratio of 1:1, we have succeeded in mechanical alloying (MA) of binary nano-TiZr with grain size of 7.6 nm at room temperature and under argon gas protection. We show that plastic deformation plays an important part in MA. Particle size reduction makes more and more atoms occurring at the grain boundaries, leading to accelerating the slip and atom diffusion of different compositions. Ti is more ductile than Zr, as a result, the size reduction of Zr is more obvious. The fragmented Zr particles diffuse and move towards the plastic deformed Ti "bed", and finally the new phase have formed.更多还原