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AM50-0.3 wt%CaO 합금의 미세조직과 상·고온 기계적 특성

Microstructure and Mechanical Properties at Room and Elevated Temperatures in AM50-0.3 wt%CaO Alloy

  • 조은호 (한국생산기술연구원 융합신공정연구그룹) ;
  • 전중환 (한국생산기술연구원 융합신공정연구그룹) ;
  • 김영직 (성균관대학교 신소재공학부)
  • Cho, Eun-Ho (Advanced Fusion Process R&D Group, Korea Institute of Industrial Technology) ;
  • Jun, Joong-Hwan (Advanced Fusion Process R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Young-Jik (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
  • 투고 : 2012.08.09
  • 심사 : 2012.08.31
  • 발행 : 2012.10.27

초록

The present study is intended to comparatively investigate the changes in microstructure and tensile properties at room and elevated temperatures in commercial AM50(Mg-5%Al-0.3%Mn) and 0.3 wt%CaO added ECO-AM50 alloys produced by permanent mould casting. The typical microstructure of AM50 alloy was distinctively characterized using two intermetallic compounds, ${\beta}(Mg_{17}Al_{12})$ and $Al_8Mn_5$, along with ${\alpha}$-(Mg) matrix in an as-cast state. The addition of a small amount of CaO played a role in reducing dendrite cell size and quantity of the ${\beta}$ phase in the AM50 alloy. It is interesting to note that the added CaO introduced a small amount of $Al_2Ca$ adjacent to the ${\beta}$ compounds, and that inhomogeneous enrichment of elemental Ca was observed within the ${\beta}$ phase. The ECO-AM50 alloy showed higher hardness and better YS and UTS at room temperature than did the AM50 alloy, which characteristics can be mainly ascribed to the finer-grained microstructure that originated from the CaO addition. At $175^{\circ}C$, higher levels of YS and UTS and higher elongation were obtained for the ECO-AM50 alloy, demonstrating that even 0.3 wt%CaO addition can be beneficial in promoting the heat resistance of the AM50 alloy. The combinational contributions of enhanced thermal stability of the Ca-containing ${\beta}$ phase and the introduction of a stable $Al_2Ca$ phase with high melting point are thought to be responsible for the improvement of the high temperature tensile properties in the ECO-AM50 alloy.

키워드

참고문헌

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피인용 문헌

  1. Corrosion Behavior of Mg-Al-Zn-CaO Alloy vol.33, pp.3, 2013, https://doi.org/10.7777/jkfs.2013.33.3.127
  2. Effect of CaO Addition on Microstructure and Damping Capacity of AM50 Magnesium Alloy vol.54, pp.3, 2013, https://doi.org/10.2320/matertrans.M2012308