Effects of Alloy Compositions on Amorphization and Crystallization of Al-Ni-Ce-C Powders by Mechanical Alloying
In the present work, Al-Ni-Ce-C amorphous powders with different compositions have been prepared by a high energy ball milling technique. The amorphization behaviors of the Al-Ni-Ce-C powders have been studied using X-ray diffraction and transmission electron microscopy. The results show that alloy compositions have a great influence on the amorphization behavior of the Al-Ni-Ce-C powders and the optimum composition is Al85Ni10Ce5+1 wt.% C for the formation of amorphous phase. The thermal stability of the as-milled powders has been investigated by differential scanning calorimetry. It has been found that the compositional effects on thermal stability are similar to those on the amorphization of Al-Ni-Ce-C. In addition, the more addition of carbon decreases both glass forming ability and thermal stability of the Al-Ni-Ce-C system under ball milling conditions. Furthermore, comparison has been carried out between Al85Ni10Ce5+1 wt.% C amorphous powders and Al85Ni10Ce5 glassy ribbons with respect to thermal stability.
J. H. Chen et al., "Effects of Alloy Compositions on Amorphization and Crystallization of Al-Ni-Ce-C Powders by Mechanical Alloying", Applied Mechanics and Materials, Vols. 66-68, pp. 2109-2116, 2011