Effects of Samarium on Microstructure and Mechanical Properties of Mg-Al-Ca Alloys

Abstract:

As samarium addition was increased, α- Mg matrix morphology was changed from dendritic to equiaxed grains and average value of grain size was decreased from 101.6㎛ to 39.3㎛. Samarium addition to Mg-5Al-3Ca based alloys resulted in the formation of Mg-Al-Sm thernary intermetallic compounds at grain boundarys and α-Mg matrix grains. In these alloys, two kinds of eutectic structure were observed; coarse irregular-shape structure at grain boundary and fine needle-shape structure in the α-Mg matrix grain. It is found that the yield strength and ultimate strength showed the maximum value of 109.1MPa and 139.3 at Mg-5Al-3Ca-2Sm alloy, respectively.

• Periodical: Materials Science Forum (Volumes 544-545)
• Pages: 295-298
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.544-545.295
• Online since: May 2007
• Authors: Hyeon Taek Son, Jae Seol Lee, Young Kyun Kim, Ik Hyun Oh, Kyosuke Yoshimi, Kouichi Maruyama
• Keywords: Mg-Al-Ca Alloy, Rear-Earth Elements, Samarium

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