Effect of long-term room-temperature storage on the structure and properties of glassy melt-spun Mg-Al-Ca alloys |
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Authors: | M S Ong Y Li W M Rainforth H Jones |
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Affiliation: | (1) the Department of Materials Science, National University of Singapore, 119260, Singapore;(2) the Department of Engineering Materials, University of Sheffield, S1 3JD Sheffield, United Kingdom |
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Abstract: | The effects of 48 months storage at room temperature on the structure and properties of glassy meltspun Mg-Al-Ca alloys has
been determined. The results show that while Knoop hardness does not differ significantly from values obtained shortly after
melt spinning, x-ray diffraction (XRD) shows considerably stronger signals from αMg present in the glassy matrix, detected only for the most dilute glass forming composition some months after melt spinning.
High-resolution electron microscopy (HREM) studies show the presence of nanocrystallites in the glassy matrix with interplanar
spacings matching αMg, and energy-dispersive spectroscopy (EDS) indicates the presence of Al and Ca within these nanocrystallites. Differential
scanning calorimetry (DSC) studies at 20, 40, and 80 K/min show evidence of two-stage crystallization with the first stage
starting at ∼120 deg with a peak at ∼150 °C and the second stage peaking at ∼250 °C. The significance of these results is
discussed. |
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