Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effects of Zn Addition on Hardness and Microstructure of Discontinuous Precipitates in Isothermally Aged Mg-Al-(Zn) Alloys

등온 시효한 Mg-Al-(Zn) 합금에서 불연속 석출물의 경도와 미세조직에 미치는 Zn 첨가의 영향

  • Jun, Joong-Hwan (Industrial Materials Processing R&D Department, Korea Institute of Industrial Technology)
  • 전중환 (한국생산기술연구원 산업소재공정연구부문)
  • Received : 2022.06.23
  • Accepted : 2022.07.11
  • Published : 2022.07.30
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Abstract

The present study aims to investigate the influence of Zn addition on hardness and microstructural characteristics of discontinuous precipitates (DPs) formed by isothermal aging in Mg-9%Al and Mg-9%Al-1%Zn alloys. To obtain large DPs volume fractions in the microstructure, the alloy specimens were solution-treated at 688 K for 24 h followed by water quenching, and then aged at 413 K for 48 h. The aged Mg-9%Al-1%Zn alloy had higher DPs content than the Mg-9%Al alloy, indicating that the Zn addition plays a beneficial role in enhancing age-hardening response. The DPs in the Zn-containing alloy possessed the higher hardness than those of the Zn-free alloy. Microstructural examination revealed that the increased hardness of the DPs resulting from the Zn addition is closely associated with the lower α-(Mg)/β(Mg17Al12) interlamellar spacing and the higher volume fraction of β phase layer of the DPs.

Keywords

Acknowledgement

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2021R1F1A1049912).

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