Nano-icosahedral quasicrystalline phase formation from a supercooled liquid state in Zr–Fe–Ni ternary metallic glass

2000 ◽  
Vol 76 (21) ◽  
pp. 3037-3039 ◽  
Author(s):  
Junji Saida ◽  
Chunfei Li ◽  
Mitsuhide Matsushita ◽  
Akihisa Inoue
Keyword(s):  
Metallic Glass ◽  
Phase Formation ◽  
Liquid State ◽  
Supercooled Liquid ◽  
Quasicrystalline Phase ◽  
Supercooled Liquid State ◽  
Icosahedral Quasicrystalline Phase ◽  
Icosahedral Quasicrystalline

Precipitation of icosahedral quasicrystalline phase in Hf69.5Al7.5Ni11Cu12 metallic glass

2001 ◽  
Vol 16 (4) ◽  
pp. 1190-1194 ◽  
Author(s):  
Chunfei Li ◽  
Akihisa Inoue
Keyword(s):  
Metallic Glass ◽  
Melt Spinning ◽  
Crystallization Process ◽  
Exothermic Reaction ◽  
Quasicrystalline Phase ◽  
Scanning Calorimetry ◽  
Exothermic Reactions ◽  
Transmission Electron ◽  
Icosahedral Quasicrystalline Phase ◽  
Icosahedral Quasicrystalline

A Hf69.5Al7.5Ni11Cu12 metallic glass was prepared by a single roller melt-spinning method, and the crystallization process was studied by x-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. The metallic glass crystallizes through three exothermic reactions. The low-temperature exothermic reaction corresponded to the precipitation of an icosahedral quasicrystalline phase. Further annealing at higher temperature led to the decomposition of the icosahedral quasicrystalline phase to other stable crystalline phases, indicating that the precipitated icosahedral quasicrystalline phase was in a metastable state. The crystallization process of the present alloy was compared with that of other Hf–Al–Ni–Cu alloys, and the reason for the precipitation of the icosahedral quasicrystalline phase was discussed.

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