Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Changes in Microstructure and Mechanical Properties due to Heat Treatment of Mg-1.0Al-1.0Zn-0.2Mn-0.5Ca Alloy Sheet Manufactured via Normal Casting and Twin Roll Casting Process

일반주조 및 쌍롤주조 공정으로 제조된 Mg-1.0Al-1.0Zn-0.2Mn-0.5Ca 합금 판재의 열처리에 따른 미세조직 및 기계적 특성 변화

  • Dong Hwan Eom (School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology (KIT)) ;
  • No Jin Park (School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology (KIT))
  • 엄동환 (금오공과대학교 신소재공학부) ;
  • 박노진 (금오공과대학교 신소재공학부)
  • Received : 2023.11.01
  • Accepted : 2023.11.17
  • Published : 2023.11.30
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Abstract

Changes in microstructure and mechanical properties of Mg-1.0Al-1.0Zn-0.2Mn-0.5Ca (AZMX1100) alloy sheet manufactured by normal casting and twin roll casting process, were studied according to process and heat treatment. Non-uniform microstructure was observed in the initial sheet produced through both processes, and in particular, tilted dendrites and shifted central segregation were observed in the twin roll casting sheet. It was homogenized through hot rolling and heat treatment, and heat treated at 350℃ and 400℃ to compare the effect of heat treatment temperature. Both sheets were homogenized by the hot rolling process, and the grain size increased as the heat treatment temperature and time increased. It was confirmed that the grain size, deviation, and distribution of the second phase were finer and more homogenized in the TRC sheet. Accordingly, mechanical properties such as hardness, formability, and tensile strength also showed better values. However, unlike other previously reported AZMX alloy systems, it showed low formability (Erichsen value), which was judged by the influence of Al2Ca present in the microstructure.

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References

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