Abstract
A quaternary Ti34Zr11Cu47Ni8 alloy is subjected to mechanical alloying on a low energy ball mill. The structure evolution of the as-milled powders upon heating is investigated by means of thermal analysis and X-ray diffraction. An unknown metastable phase is formed by heat treating the 25 h-milled sample which retains the crystalline state. Amorphization is clearly confirmed in the 100 h-milled Ti34Zr11Cu47Ni8 alloy. Thermal crystallization of the as-milled amorphous phase proceeds via two separate steps corresponding respectively to crystallization of NiTi and Cu51Zr11 intermetallic compounds, respectively. The influences of chemical composition and milling time on amorphization and thermal crystallization of the Ti34Zr11Cu47Ni8 alloy are discussed.
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