Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Artificial Aging Characterization of As-cast Al-Si-Cu-xZr Alloy with the Addition of Zr Contents

지르코늄 첨가에 따른 주조 AI-Si-Cu-xZr 합금의 인공시효 특성평가

  • Seunggwan Lee (Korea Automotive Technology Institute) ;
  • Chungseok Kim (Department of Materials Science and Engineering, Chosun University)
  • Received : 2024.10.16
  • Accepted : 2024.10.29
  • Published : 2024.11.30
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Abstract

In this study, the effect of zirconium to commercial Al-Si-Cu alloy on the microstructure and mechanical properties was investigated. The test specimens of Zr addition were prepared by gravity casting with commercialized Al12Si2Cu, Al6Si2Cu, and Al10Zr master alloys up to 1 wt.%. The cast ingot was subjected to solution treatment at 495℃ for 4 h and then aged at 190℃ for T6 heat treatment. The secondary dendrite arm spacing (SDAS) of the alloy increased as the amount of Zr addition increased, and the primary (Al,Si)3(Zr,Ti) phase was generated. The hardness decreased with the increase in SDAS. Precipitation of the Zr-rich phase in the Al matrix after T6 heat treatment was observed by EPMA (electron probe micro-analzer), EDS (energy dispersive spectroscopy), and XRD (X-ray diffraction) bulk-extraction. Consequently, The generation of Zr-rich phase with the addition of Zr in Al-Si-Cu alloy would be a successful hardening phenomenon in Al alloy.

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Acknowledgement

본 과제(결과물)는 2024년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 지자체-대학 협력기반 지역혁신 사업의 결과입니다(과제관리번호: 2021RIS-002).