Microstructure and Mechanical Properties of Mg-Al-Ca-Nd Alloys Fabricated by Gravity Casting

材料科学技术（英文）, 2008, 24(1): 85-88.

^1, , ^2, , ^3, , ^4,

1.Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju, 500-480, South Korea

2.Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju, 500-480, South Korea

3.Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju, 500-480, South Korea

4.Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju, 500-480, South Korea

Microstructure and Mechanical Properties of Mg-Al-Ca-Nd Alloys Fabricated by Gravity Casting

Hyeon-Taek Son ^1, , Jae-Seol Lee ^2, , Ik-Hyun Oh ^3, , Chang-Seog Kang ^4,

1.Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju, 500-480, South Korea

2.Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju, 500-480, South Korea

3.Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju, 500-480, South Korea

4.Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju, 500-480, South Korea

Keywords： Mg-Al-Ca alloy

The aims of this study are to investigate the effects of Nd addition in the Mg-Al-Ca alloys on microstructure and mechanical properties. Microstructure of as-cast Mg-5Al-3Ca alloy containing Nd consists of α-Mg matrix,eutectic phase and Al-Nd rich intermetallic compound. As Nd addition was increased, α-Mg matrix morphology was changed from dendritic to equiaxed grains and average value of grain size was decreased. Nd addition to Mg-5Al-3Ca based alloys resulted in the formation of Al-Nd rich intermetallic compounds at grain boundary and α-Mg matrix grains. And these Al-Nd rich intermetallic compounds were dispersed homogeneously. In these alloys, two kinds of eutectic phases were observed, i.e. coarse irregular-shape structure at grain boundary and fine needle-shape structure in the α-Mg matrix grain. It is found that the ultimate strength showed the maximum value of 271 MPa at Mg-5Al-3Ca-2Nd alloy and elongation was decreased as the addition of Nd was increased.

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Microstructure and Mechanical Properties of Mg-Al-Ca-Nd Alloys Fabricated by Gravity Casting

参考文献