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Son, Hyeon-Taek,Lee, Jae-Seol,Kang, Chang-Seog,Bae, Jung-Chan,Yoshimi, Kyosuke,Maruyama, Kouichi The Japan Institute of Metals 2008 MATERIALS TRANSACTIONS Vol.49 No.5
<P>The as-cast microstructure of Mg-5Al-3Ca-<I>x</I>Y alloy consists of dendritic α-Mg matrix, (Mg, Al)<SUB>2</SUB>Ca eutectic phase and Al<SUB>2</SUB>Y intermetallic compounds. These two kind of (Mg, Al)<SUB>2</SUB>Ca compounds were observed: coarse irregular-shape structure at grain boundary and fine needle-shape structure in the α-Mg matrix grain. This (Mg, Al)<SUB>2</SUB>Ca phase of the extruded alloys was elongated to extrusion direction and size of this phase was refined comparing with that of as-cast alloys because of severe deformation during hot extrusion. Maximum yield and ultimate strength value of extruded alloys was 326 and 331 MPa at Mg-5Al-3Ca-3Y alloy, respectively. From these results, it is conclusively demonstrated that Y additions on Mg-5Al-3Ca alloy have more effect to improve mechanical properties.</P>
Son, Hyeon-Taek,Lee, Jae-Seol,Oh, Ik-Hyun,Kim, Dae-Guen,Yoshimi, Kyosuke,Maruyama, Kouichi The Japan Institute of Metals 2008 MATERIALS TRANSACTIONS Vol.49 No.5
<P>The as-cast microstructure of Mg-5Al-3Ca-<I>x</I>Nd alloys consists of equiaxed α-Mg matrix, (Mg, Al)<SUB>2</SUB>Ca eutectic phase and Al-Nd rich intermetallic compounds. With the increase of Nd addition, α-Mg matrix morphology was changed from dendritic to equiaxed grains due to suppression of grain growth by formation of homogeneous intermetallic compounds containing Nd dispersed at grain boundary and α-Mg matrix. And the grain size of as-cast alloys was decreased as addition of Nd was increased. This eutectic phase of the extruded alloys was elongated to extrusion direction and size of this phase was redined comparing to that of as-cast alloys because of severe deformation during hot extrusion. Maximum yield and ultimate tensile strength value of the as-extruded alloys was 322 and 335 MPa at Mg-5Al-3Ca-2Nd alloy, respectively.</P>
Microstructure and Mechanical Properties of Mg-Al-Ca-Sm Alloys at High Temperature
Son, Hyeon Taek,Lee, Jae Seol,Hong, Ji Min,Oh, Ik Hyun,Yoshimi, Kyosuke,Maruyama, Kouichi Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.345 No.-
<P>The aims of this research are to investigate the effect of Sm addition in Mg-Al-Ca alloys on microstructure and mechanical properties. Sm addition to Mg-5Al-3Ca based alloys results in the change from dendritic to equiaxed grain morphorlogy and formation of Al-Sm rich itermetallic compounds at grain boundary and α-Mg matrix. And these Al-Sm rich intermetallic compounds were dispersed homogeously and stabilized at high temperature. And maximum yield and ultimate strength value was obtained at Mg-5Al-3Ca-2Sm alloys at elevated temperature because of homogeneous dispersion of stable Al-Sm rich intermetallic compound at high temperature.</P>
Effects of Samarium on Microstructure and Mechanical Properties of Mg-Al-Ca Alloys
Son, Hyeon Taek,Lee, Jae Seol,Kim, Young Kyun,Oh, Ik Hyun,Yoshimi, Kyosuke,Maruyama, Kouichi Scientific.Net 2007 Materials Science Forum Vol.544-545 No.-
<P>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.</P>