한국재료학회지 (Korean Journal of Materials Research)

  • 제17권4호
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  • Pages.192-197
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  • 2007
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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가공용 알루미늄 합금의 극저온 특성

An Extremely Low Temperature Properties of Wrought Aluminum Alloys

  • Jung, Chan-Hoi (Department of Advanced Materials Engineering, Donga University) ;
  • Kim, Soon-Kook (Department of Advanced Materials Engineering, Donga University) ;
  • Lee, Jun-Hee (Department of Advanced Materials Engineering, Donga University) ;
  • Lee, Hae-Woo (Department of Advanced Materials Engineering, Donga University) ;
  • Jang, Chang-Woo (Base Material Research Team, Iljin Global)
  • 발행 : 2007.04.27
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초록

The effects of immersion time in the liquid nitrogen on the behavior of aluminum alloys used for the hydrogen storage tank of auto-mobile at cryogenic temperature were investigated. With increasing immersion time in the liquid nitrogen, the elongation of AI 5083 alloy at cryogenic temperature decreased because of non-uniform fracture of precipitates on the grain boundary, and the serration also occurred because of discontinuous slip due to rapid decreasing of the specific heat. The mechanical properties of AI 6061 alloy at cryogenic temperature were characterized by uniformed yield strength, tensile strength and elongation regardless of the immersion time in the liquid nitrogen. These mechanical properties of aluminum alloys at cryogenic temperature were interpreted by the strength of grain boundary and the slip deformation behavior.

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