Effects of Samarium on Microstructure and Mechanical Properties of Mg-Al-Ca Alloys
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.
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
H. T. Son et al., "Effects of Samarium on Microstructure and Mechanical Properties of Mg-Al-Ca Alloys ", Materials Science Forum, Vols. 544-545, pp. 295-298, 2007