钛-锆二元纳米机械合金化的基本模式

在室温下大批量地制备了晶粒尺度为7.6 nm的纯粹的二元钛-锆纳米合金,合金的生成经历了塑性变形、颗粒细化、粒子植入、原子扩散和渗透等阶段,其中钛的超前塑性变形为锆粒子的植入、扩散和渗透提供了良好的反应基体和充分条件,没有钛预先足够的塑性变形,就不可能有任何新的产物生成。另一方面,锆粒子向钛基体植入为合金的生成提供了必要条件,但是,如果锆晶粒没有足够的细化,就不会有锆粒子植入钛基体中。该文为同族的而且具有完全固溶性的金属的机械合金化开创了一种新模式。

Mechanical Alloying Model for Binary Nano-synthesizing of Ti and Zr

It was discussed that the mechanical alloying model for the first successful synthesis of binary nano-composite of Ti and Zr with grain size 7.6 nm in large scale and at room temperature.The process contained plastic deformation, particle size reduction,particle implantation,and atomic diffusion and permission,where the prior-plastic deformation of Ti provided the matrix and guarantee for the reaction.If Ti had not pre-deformed sufficiently,the alloying would not take place.On the other hand,Zr grain size reduction leading to particle implantation into the Ti matix was the necessary condition for the combination,the work could not have been completed without enough size reduction of Zr.Our study provided a new mechanism of mechanical alloying for binary alloys consisting from the same group metals in the periodic table and exhibiting the complete solid solubility.