CRYSTALLIZATION OF AMORPHOUS ALLOYS BY HIGH ENERGY MECHANICAL DEFOFMATION

Abstract

High energy ball milling has been used extensively in the last few years to produce amorphous metallic alloys by mechanically alloying pure crystalline elements or by high energy mechanical deformations of intermetallic compounds. The structural transformations occurring during the milling process is usually ascribed to a local effective temperature at the collision sites. At too elevated milling intensities, the effective temperature would be such that the precipitation of intermetallic compounds would occur/1. In this paper, the process of ball milling is used to crystallize already amorphous iron based alloys. The structural stability of the amorphous alloys against a thermal and mechanical deformation process is compared and the results indicate that the local effective temperature at the collision site is not the important parameter that controls the crystallization process during the deformations.