Solid-state amorphization in Ta-based alloy system by mechanical alloying technique

Amorphization of mechanically alloyed TM-Ta (TM: Fe, Co, Ni) powders was performed in this study. The results indicated that complete amorphization was possible for the composition ranges TM10Ta90-TM80Ta20 (TM: Ni, Co) and Fe10Ta90-Fe70Ta30. The range is larger than for amorphous Ni-Ta alloys prepared by the splat-quenching process and compatible with those of amorphous alloys of Co-Ta and Fe-Ta systems produced by vapor quenching methods, A supersaturated solid solution formed for Co-and Fe-rich compositions. The thermal stability was investigated by differential thermal analysis. The crystallization temperature of amorphous Co-Ta and Ni-Ta powders was found to be proportional to Ta content and higher than those of amorphous alloys produced by rapid cooling techniques.