Abstract
The mechanical alloying is the most convenient method to produce MgNi alloys. In this study, the effect of ball-to-powder
weight ratios and the mechanical alloying time on amorphization of Mg50Ni50 alloy and its thermal stabilities were investigated.
Mg50Ni50 alloy has been produced by using Spex 8000 D mixer/mill with different ball-to-powder weight ratios (5:1, 10:1, 20:1).
Amorphization times by XRD analysis are found to be 60 h for 5:1 ball-to-powder weight ratio, 10 h for 10:1 ball-to-powder
weight ratio and 5 h for 20:1 ball-to-powder weight ratio. The thermal stabilities of amorphous Mg50Ni50 alloys, obtained by
different ball-to-powder weight ratios, have been determined and the effect of heating rates on the crystallization temperatures
have also been investigated by DSC. The heating rates employed were 5, 10, 15, 20 ◦C/min. During the first crystallization
reaction, the amorphous and Mg2Ni intermetallic phases occurred. DSC studies show that increase in heating rates increased the
crystallization temperatures for all samples. The apparent activation energies were determined by means of the Kissinger method.
2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
Keywords: Amorphous materials; Mechanical alloying; Hydrogen storage; Crystallization
1. Introduction
Mechanical alloying is a solid-state powderprocessing
technique that allows to synthesize materials
by a high-energy ball mil领. This method was
first developed by Benjamin and co-workers in 1966
to produce oxide dispersion-strengthened alloys [1,2].
Mechanical alloying has been used to produce various
materials such as oxide dispersion-strengthened alloys, SPEX8000D 高能量球磨机
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