Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Microstructure and Mechanical Properties of Twin-Roll Strip-Cast Al-5.5Mg-0.02Ti Alloy Sheet

쌍롤 박판주조법으로 제조된 Al-5.5Mg-0.02Ti합금의 미세조직 및 기계적 특성

  • Cheon, Boo-Hyeon (Department of Material Science and Engineering, Korea University) ;
  • Han, Jun-Hyun (Division of Materials Science and Engineering, Korea Institute of Science and Technology) ;
  • Kim, Hyoung-Wook (Structural Materials Division, Korea Institute of Materials Science) ;
  • Lee, Jae-Chul (Department of Material Science and Engineering, Korea University)
  • 천부현 (고려대학교 신소재공학과) ;
  • 한준현 (한국과학기술연구원 재료연구부) ;
  • 김형욱 (한국기계연구원 부설 재료연구소 구조재료연구본부) ;
  • 이재철 (고려대학교 신소재공학과)
  • Received : 2010.01.18
  • Published : 2010.05.22
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Abstract

High-strength aluminum alloy sheets with high magnesium contents were fabricated by a strip caster equipped with an asymmetric nozzle, which has been proven to be effective for reducing surface defects and internal segregation. 4 mm thick as-cast sheets consisting of fine dendrites and minor $Al_{8}Mg_{5}$ segregation were hot-rolled successfully to 1 mm sheets and subsequently annealed at various temperatures. The sheet revealed the tensile strength and elongation of 306 MPa and 34%, respectively, when it was rolled at 250${^{\circ}C}$ and subsequently annealed at 475${^{\circ}C}$, which exhibits the feasibility of the practical application for autobodies. The observed mechanical properties were explained on the basis of the microstructural characteristics of the alloy sheets.

Keywords

Acknowledgement

Supported by : 한국부품소재산업진흥원,고려대학교

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