Preparation and Characterization of Dual-Phase Bulk Metallic Glasses through Powder Metallurgy Route

抄録

In the present study, amorphous Mg₄₉Y₁₅Cu₃₆ and Ti₅₀Cu₂₈Ni₁₅Sn₇ alloy powders were synthesized separately by using a mechanical alloying technique. The dual-phase (Mg₄₉Y₁₅Cu₃₆)_100−x(Ti₅₀Cu₂₈Ni₁₅Sn₇)_x (x=0, 10, 20, 30, 40, and 50 vol%) powders were prepared by mixing the corresponding amorphous powders. The amorphous dual-phase powders were then consolidated into bulk metallic glass (BMG) discs. The amorphization status of as-prepared powders and BMG discs was confirmed by X-ray diffraction and by using a differential scanning calorimeter. The microstructure of the BMG discs showed that the Ti₅₀Cu₂₈Ni₁₅Sn₇ phase is distributed homogeneously within the Mg₄₉Y₁₅Cu₃₆ matrix. The (Mg₄₉Y₁₅Cu₃₆)₅₀(Ti₅₀Cu₂₈Ni₁₅Sn₇)₅₀ BMG disc exhibited a relative density of 97.2% and its Vickers microhardness was 526±20 kg/mm².