Mechanical Crystallization of Metglas Fe78B13Si9 by Cryogenic High Energy Ball Milling

Abstract

AbstractA nanocrystalline material was synthesized by cryogenic ball milling of Metglas Fe78B13Si9 ribbons. The nanocrystalline structure consisted of α-Fe(Si) and Fe2B grains of 2-13 nm in diameter. In the early stages of milling, bending-induced shear bands were formed, followed by the initial stages of crystallization. As the milling proceeded, predominantly wearlike mechanisms caused further crystallization. The crystallization process was slowed considerably by the addition of 17 at.% Ni during cryogenic milling. The results indicate that the 17 at.% Ni did not form a supersaturated solid solution in the metallic glass, but impeded crystallization by reducing the efficiency of bending and wear-like mechanisms during milling.