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급속응고한 AZ91 합금의 미세조직 및 기계적 특성에 미치는 Misch metal 첨가의 영향
엄승열 ( Seung Yeul Eum ),박훈모 ( Hoon Mo Park ),남태운 ( Tae Woon Nam ) 한국주조공학회 2000 한국주조공학회지 Vol.20 No.1
The purpose of this study is to investigate the effect of misch metal addition on the microstructure and mechanical property of rapidly solidified AZ91 alloy by melt spinning process. As the contents of misch metal(rare earth element:Ce, La, Nd, Pr) was increased, the microstructure of RS ribbons and extrudates became finer than those of AZ91, and RE related phases (Al11RE3, Al2RE) were formed. At room temperature, the rapidly solidified AZ91 +1 wt%Mm alloy showed the highest tensile strength, 430 MPa due to precipitation strengthening ofβ(Mg17Al12) phase and Al11RE3 phase. At the elevated temperature, the mechanical property of AZ91 +3 wt%Mm alloy was higher than those of other Mg alloys. The reasons were that Al11La3 phase was thermally stable and suppressed the grain growth. In contrast with Al11La3 phase, β phase was thermally unstable and could not suppress the grain growth at the elevated temperature. Therefore, Al11RE3 phase contributed to improve the thermal stability of RS AZ91 alloy.