TEM Observation of Precipitates in a Mg-Gd-Sc Alloy with High Content of Sc

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Precipitates in a Mg–Gd–Sc alloy with high Sc content (up to 13mass%) were examined by means of transmission electron microscopy. Plate-like precipitates appeared during the early stages of aging of specimens aged at 573 K. The plate-like precipitates lay on the { } magnesium matrix planes, and were similar to the β1 phase and β phase in the counterpart Mg–Gd–Zr alloy aged at 523 K. These precipitates had a high Sc content. Particle-shaped precipitate were observed alongside the plate-like precipitates, unlike the case in Mg–Gd alloys. The contrasts of the plate-like precipitates became longer and the number density of precipitate contrasts increased with increasing aging time at 573 K up to the point where the maximum hardness was attained. We suggest that the plate-like precipitates contribute to the increased hardness of Mg–Gd–Sc alloys with a high content of Sc.

Info:

Periodical:

Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton

Pages:

627-630

DOI:

10.4028/www.scientific.net/MSF.654-656.627

Citation:

T. Fujii et al., "TEM Observation of Precipitates in a Mg-Gd-Sc Alloy with High Content of Sc", Materials Science Forum, Vols. 654-656, pp. 627-630, 2010

Online since:

June 2010

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$35.00

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