Mg-Al계 합금의 기계적 성질에 미치는 Al의 영향

The effects of aluminium contents on the mechanical properties of magnesium-aluminium alloy

  • 맹완영 (원자력 연구소) ;
  • 백정하 (한양대학교 금속재료 공학과) ;
  • 오인상 (한양대학교 금속재료 공학과) ;
  • 남태운 (한양대학교 금속재료 공학과)
  • 발행 : 1994.06.30

초록

In the molten state, magnesium alloys vigousey react with oxygen in the air, is protected from oxidation and burning by the addition of $SF_6$ to $CO_2$ atmosphere over the melt. The mechanical properties and metallographic examinatin have made of Mg-Al alloys containing 3, 6, 9% in the solution treated state and precipitated state, comparing mechanical properties obtained during unidirectional solidification with me chanical properties obtained during conventional casting. For a given solution treatment, a higher aluminum contents produce more or less fine grains in conventional casting. For a given artifical aging treatment, a higher aluminum contents produces much precitates at the grain boundary as well as within the grain in unidirectional solidification. As a result of this experiment, for a given heat treatment, the higher is aluminum contents the higher is the ultimate tensile strength, yield strength, hardness while the lower the elongation. Also the mechanical properties of unidirectional solidification is larger than that of conventional casting.

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