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Variation of Material Characteristics of a Hot-formed AZ31 Magnesium Alloy

마그네슘 합금 AZ31의 온간성형과 재료특성변화에 관한 연구

  • 서창민 (경북대학교 기계공학부) ;
  • 허광호 (경북하이브리드연구원) ;
  • 김효민 (경북하이브리드연구원) ;
  • 서민수 (한국에너지기술연구원)
  • Received : 2012.12.10
  • Accepted : 2013.04.08
  • Published : 2013.07.01

Abstract

Magnesium alloys are known to be hard-forming materials at room temperature owing to their material structure. This study analyzes the optimal temperature conditions of warm-forming and the forming process by using a high-pressure laminating test and FM analysis, respectively. The effect of temperature on the fatigue limit was examined from the collected specimens by analyzing the material properties after the fatigue test. The material formed at a temperature of $230^{\circ}C$ shows occasional defects, but the best forming quality was obtained at $270^{\circ}C$. The optimal temperature for the forming process was found to be $250^{\circ}C$ considering the material quality and thermal efficiency. The overall fatigue life of specimens decreases with an increase in the processing temperature. The fatigue limit of AZ31 formed at $250^{\circ}C$ was approximately 100 MPa after $10^6$ cycles.

Keywords

Magnesium Alloy;Hot-Forming;Finite Element Analysis;Fatigue Test;Battery Pack Case

Acknowledgement

Supported by : 한국연구재단

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