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안정화 열처리에 의한 Al-4.8Zn-1.3Mg계 합금 압출재 특성 평가 Characterization of Extrusion Parts for after Pre-aging Treatment in an Al-4.8Zn-1.3Mg Alloy

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한국기계기술학회지 (韓國機械技術學會誌)
제20권 제6호 (2018.12)
pp.818-823
한국기계기술학회 (Korean Society of Mechanical Technology)
초록

In this study, the effect of pre-aging treatment for inhibition of natural aging of Al-4.8Zn-1.3Mg alloy by extrusion process was investigated. Firstly, the as-cast microstructure of Al-4.8Zn-1.3Mg alloy billet and its evolution during homogenization(460℃, 4h + 510℃, 5h) were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), hardness analysis. The as-cast microstructures of Al-4.8Zn-1.3Mg alloy reveal Mg2Zn, Al5Cu, Al3Cu formed between dendrities. After homogenization, MgZn, Al4Cu, Al13Cu phases precipitated into the matrix. In addition, standard deviation of homogenized billet was improved than as-cast billet from 2.62 to 0.99. According to pre-aging(100℃, 1h) Al-4.8Zn-1.3Mg alloy by extrusion process, yield strength and tensile strength deviation improved more than condition by natural aging.

키워드
Aluminum Alloy알루미늄 합금Extrusion압출Homogenization균질화 처리Heat Treatment열처리Microstructure미세조직
목차
ABSTRACT
 1. 서 론
 2. 실험내용 및 방법
  2.1 균질화 열처리
  2.2 안정화 열처리
 3. 실험결과 및 고찰
  3.1 주조재 미세조직 특성
  3.2 균질재 미세조직 특성
  3.3 균질 열처리 후 경도 산포
  3.4 안정화 열처리 후 기계적 특성 평가
 4. 결 론
 References
저자
  • 이창연(Assistant Manager, DaejooKores Company) | Chang-Yeon Lee Corresponding Author