氢对Zr-Ti-Cu-Ni-Be块体非晶合金纳米晶体形成的影响

Effects of Hydrogen on the Crystallization Process of Zr41.2Ti13.8Cu12.5Ni10Be22.5 Bulk Amorphous Alloys

摘要:

采用电弧熔炼及水冷铜模快速冷却的方法，制备Zr41．2Ti13．8Cu12．5Ni10Be22．5块体非晶合金，通过电化学方法对块体非晶合金材料充入氢。利用差热扫描量热分析、Kissinger方程及高分辨电镜，研究了氢对块体非晶合金退火时晶化过程的影响。结果表明：氢提高玻璃转变和晶化激活能，延迟晶核的形成及长大。此外，充氢有利于形成单独晶核的晶粒，使纳米晶粒更细小、分布均匀。

Abstract:

Zr41.2Ti13.8Ni10Cu12.5Be22.5 bulk amorphous alloy was prepared by arc-melting and rapid casting into a copper mould. Hydrogen charging was performed electrochemically in glycerine-phosphoric acid electrolyte. The effects of hydrogen on the crystallization process of Zr-Ti-Cu-Ni-Be bulk amorphous alloy were studied by differential scanning calorimetry (DSC), Kissinger equation and high-resolution transmission electron microscope (HRTEM). It is shown that hydrogen increases the activation energy of the glass transition and crystallization, and retards the nucleation and crystal growth. Moreover, hydrogen charging contributes to the formation of isolated crystals, resulting in the precipitation of fine and uniformly distributed nanocrystallines.