Ca$CN_2$ 첨가에 의한 AM60 마그네슘 합금의 결정립 미세화 및 기계적 성질

엄정필; 정승규; 임수근; 신희택; 정득수

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자료유형: 학술저널

저자정보: 엄정필 (경상대학교 재료공학부, 항공기부품기술연구센터) 정승규 (두레에어메탈[주]) 임수근 (경상대학교 재료공학부, 항공기부품기술연구센터) 신희택 (기아자동차[주]) 정득수 (대동기어[주])

저널정보: 한국주조공학회 한국주조공학회지 (주조) 한국주조공학회지 제18권 제4호

발행연도: 1998.1

수록면: 383 - 388 (6page)

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Effects of $CaCN_2$ addition on the grain refinement in the AM60 magnesium ingots were investigated. The effects of the $CaCN_2$ are estimated with different inoculation temperatures, inoculation contents, and holding time to find out the optimum condition. AM60 alloy was melted in the low carbon steel crucible by cylindrical electric furnace under an argon atmosphere. The melting and casting apparatus is specially designed for magnesium alloys. The grain size of AM60 magnesium alloy decreased significantly with an increase in $CaCN_2$ content and, at 0.8 wt% $CaCN_2$ or more, grain size becomes constant at about $85 {\mu}m$. The optimum condition was obtained in the 0.8 wt% $CaCN_2$ for holding molten metal of 30 min. at the temperature of $710^{\circ}C$. The tensile properties of AM60 magnesium alloys were improved due to grain refinement by addition of $CaCN_2$. In the optimum condition, the yield strength, tensile strength and elongation were ${\sigma}_{0.2}=107 MPa$, ${\sigma}_{T.S}=234 MPa$ and e=14.2%. The variation of stress with strain obeyed the relationship of the ${\sigma}=K{\varepsilon}^n$. The strain-hardening exponent, n and strength coefficient, K obtained in the 0.8 wt% $CaCN_2$ added AM 60 magnesium alloy were n=0.21 and K=390 MPa.

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