Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Change in Microstructural Stability of AZ31 Alloy By the Addition of CaO

CaO 첨가에 의한 AZ31 합금 미세조직의 열적 안정성 변화

  • Jun, Joong-Hwan (Advanced Fusion Process R&D Group, Korea Institute of Industrial Technology)
  • 전중환 (한국생산기술연구원 융합신공정연구그룹)
  • Received : 2013.03.15
  • Accepted : 2013.05.11
  • Published : 2013.05.30
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Abstract

Grain growth behaviors of hot-rolled AZ31 (Mg-3%Al-1%Zn) and AZ31-0.3%CaO alloys at elevated temperatures have been investigated in order to clarify the effect of CaO addition on grain stability of Mg-Al-based wrought alloy. The grain size of CaO-free alloy increased steeply from 673 K with an increase in annealing temperature from 573 to 773 K, whereas the grains of CaO-containing alloy were relatively stable up to 723 K. The activation energies for grain growth ($E_g$) were 12.2 and 18.3 kJ/mole between 573 and 673 K and 119.2 and 126.9 kJ/mole between 673 and 773 K in the AZ31 and AZ31-0.3%CaO alloys, respectively. This result indicates that grains in the CaO-added alloy possess higher thermal stability than CaO-free alloy. SEM observations on the annealed alloy samples revealed that higher grain stability resulting from CaO addition would be associated with the suppression of grain growth by Ca-related precipitate particles distributed in the microstructure.

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References

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