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

Takafumi Fujii; Tokimasa Kawabata; Kenji Matsuda; Susumu Ikeno

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

Paper Titles

Thermal Stability and Mechanical Properties of Extruded Mg-Zn-Y Alloys with Long-Period Stacking Order Phase
p.611

Multimodal Microstructure Evolution in Wrought Mg-Zn-Y Alloys with High Strength and Increased Ductility
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Preparation and Mechanical Property of Mg-Zn-Y Alloy with a Long Period Ordered Phase
p.619

Formation of a Novel X Phase in Mg–Gd–Zn–Zr Alloy
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TEM Observation of Precipitates in a Mg-Gd-Sc Alloy with High Content of Sc
p.627

Effect of Sc Addition on Aging Behavior of Mg-Gd Alloys
p.631

Effect of Minor Additions of Al and Si on the Mechanical Properties of Cast Mg-3Sn-2Ca Alloys in Low Temperature Range
p.635

Microstructure and Tensile Properties of an Mg-5Sn-5Zn Alloy
p.639

Microstructures and Mechanical Properties of Mg-9Zn-Zr Magnesium Alloys
p.643

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

Abstract:

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.