Abstract
The formation of amorphous phase, which are invented by Al, Ni and Zr powder, were investigated. Oscillatory ball mill was used to carry out MA (mechanical alloying) in this investigation. DMA (Double Mechanical Alloying) method was also taken, where binary amorphous phases were firstly formed by MA, and the third element powder was added to those amorphous phases, and milled by MA again. The results of DMA were compared with the results of normal MA. For MA of Al-Zr mixed powder, amorphous phases were formed for 72ks in the case of Al-40-50 mol%Zr, while Ni-Zr amorphous phases were obtained at the same milling time for Ni-35-60 mol%Zr. Ternary Al-Ni-Zr amorphous phases were successively obtained by 72 ks of DMA for 30-40 mol%Al and MAed amorphous Ni-35-60 mol%Zr mixed powders. From these results, it was shown that the DMA method was more effective and prepare a wide range ternary amorphous phase than conventional MA method. Furthermore it was confirmed that the hardness of Al-Ni-Zr amorphous alloys decreased with increasing Ni/Zr and Al/(Ni-Zr) ratios, resulted in stable amorphous phases up to higher temperature.
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