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Formation Of An Amorphous Phase And Its Crystallization In The Immiscible Nb-Zr System By Mechanical Alloying, N. Al-Aqeeli, C. Suryananrayana, M. A. Hussein

Faculty Bibliography 2010s

Mechanical alloying of binary Nb-Zr powder mixtures was carried out to evaluate the formation of metastable phases in this immiscible system. The milled powders were characterized for their constitution and structure by X-ray diffraction and transmission electron microscopy methods. It was shown that an amorphous phase had formed on milling the binary powder mixture for about 10 h and that it had crystallized on subsequent milling up to 50-70 h, referred to as mechanical crystallization. Thermodynamic and structural arguments have been presented to explain the formation of the amorphous phase and its subsequent crystallization.