Mechanically-driven Amorphization in Metallic Systems

Yuanda DONG Dept.of Metallurgy and Materials,Shanghai University of Technology,Shanghai,200072,China

摘 要：<正> The mechanism of mechanically-driven amorphization was extensively surveyed in various systems.It was concluded that the amorphization could occur in the systems of Cu-Zr with a negative heat ofmixing （-ΔH） and Cu-Ta with a positive heat of mixing （+ΔH） by mechanical alloying of elementalpowders.Such amorphization could also be started from an intermetallic compound Cu_xZr_y with nochemical reaction involved.The energy storage by mechanical attrition should be the driving forcefor the amorphization.The atomic distribution function and nuclear resonance spectroscopic studiesshow that the mechanical alloying provides a true alloying on an atomic level.The alloys formed areof a characteristic structure common to the rapidly quenched amorphous alloys.

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