Abstract
Structural change during the mechanical alloying process of a powder mixture which consists of amorphous Ti-43at%Cu alloy and aluminum crystalline powders was investigated by using X-ray diffraction and differential thermal analysis. Changes of structure and hardness in the powder mechanically alloyed for long period with heat-treatment were also investigated. During the mechanical alloying, ternary amorphous phase is formed through interdiffusion of elements over the interface between aluminum and amorphous Ti-Cu alloy powders produced. When the mechanical alloying for longer period was carried out, AlTi phase was formed. In a stage previous to the formation of ternary amorphous phase during the mechanical alloying, the aluminum solid solution dissolved titanium and copper is remained. But the aluminum phase disappeared and Al2Cu3 phase appeared as the heat-treatllent was carried out at 523K, which is lower than the crystallization temperature. Difference of Vickers hardness of the compacts prepared from the powders mechanically alloyed for 72ks and 79.2ks decreased with increasing holding period at 523K.
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