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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (20권1호 29-37)

The Effect of Misch Metal Addition on the Microstructure and Mechanical Property of Rapidly Solidified AZ91 Alloy

급속응고한 AZ91 합금의 미세조직 및 기계적 특성에 미치는 Misch metal 첨가의 영향

Seung-yeul Eum, Hoon-Mo Park, Tae-Woon Nam

Hanyang Univ.

Abstract

The purpose ofthis study is to investigate the effect ofmisch metal addition on the microstructure and mechanical property of rapidly solidified AZ9l alloy by melt spinning process. As the contents of misch metal(rare earth element:CeLa, Nd, Pr) was increased, the microstructure of RS ribbons and extrudates became finer than those of AZ91, and RE related phases (A,lRE3, AIZRE) were formed. At room temperature, the rapidly solidified AZ9l +1 wt%Mm alloy showed the highest tensile strength, 430 MPa due to precipitation strengthening of]3(Mg”Al12) phase and All IRE3 phase. At the elevated temperature, the mechani- cal property of AZ9l +3 wt%Mm alloy was higher than those of other Mg alloys. The reasons were that A,l,La3 phase was ther- mally stable and suppressed the grain growth. In contrast with Al,La3 phase, B phase was thermally unstable and could not suppress the grain growth at the elevated temperature. Therefore, All IRE3 phase contributed to improve the thermal stability of RS AZ9l alloy.

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