Abstract
Glass transition and crystallization behavior of several Mg–Ni–Nd metallic glasses has been systematically studied by temperature-modulated differential scanning calorimetry (TMDSC). The glass transition transformation of alloys Mg 75Ni 10Nd 15 and Mg 77Ni 18Ni 5, which cannot be detected in conventional differential scanning calorimetry (DSC) heating scans, was observed through TMDSC measurements. It was concluded that the signal of the glass transition on the DSC scans overlapped with the relatively large heat release from the primary crystallization of either intermetallic Mg 3Nd phase in glassy Mg 75Ni 10Nd 15 alloy or Mg 2Ni phase in amorphous alloy Mg 77Ni 18Ni 5. Increasing the content of Ni in alloy Mg 75Ni 10Nd 15 can suppress the precipitation processes of Mg 3Nd, and results in the appearance of glass transition transformation on DSC heating curves. This confirmed and verified our TMDSC measurements. Clear observation of glass transition and understanding of crystallization micro-mechanism in such alloys can offer us new alloying and processing strategies for the preparation of bulk glassy alloys and development of new nanocrystalline/amorphous composite materials.
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