Crystallization Behavior of Al-Y-Ni-Co Metallic Glass

As an important lightweight and high-strength structural material, aluminum alloy is the optimum material for airplane and aircraft. Amorphous Al-based alloys are attractive materials for structural applications because of their high strength of about 1000MPa. Crystallization behavior of amorphous Al-based alloys is critical to the synthesis of high-strength nanocrystalline aluminum alloys in bulk form. The crystallization behavior of an Al85Y8Ni5Co2 metallic glass produced by rapid solidification of the melt was studied in this paper. Microstructure transformation during crystallization was identified by X-ray diffraction. It is found that the initial crystallization of the amorphous alloy occurs through the precipitation of alpha-Al particles, followed by precipitation of hcp-Al3Y and an unidentified phase.