Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Load Relaxation and Creep Transition Behavior of a Spray Casted Hypereutectic Al-Si Alloy

분무 주조 과공정 Al-Si 계 합금의 응력이완 및 Creep 천이 거동

  • 김민수 (포항공과대학교 신소재공학과) ;
  • 방원규 (포항산업과학연구원 부품 신소재연구센터 마그네슘 프로젝트팀) ;
  • 박우진 (포항산업과학연구원 부품 신소재연구센터 마그네슘 프로젝트팀) ;
  • 장영원 (포항공과대학교 신소재공학과)
  • Published : 2005.09.01
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Abstract

Hypereutectic Al-Si alloys have been regarded attractive for automotive and aerospace application, due to high specific strength, good wear resistance, high thermal stability, low thermal expansion coefficient and good creep resistance. Spray casting of hypereutectic Al-Si alloy has been reported to provide distinct advantages over ingot metallurgy (IM) or rapid solidification/powder metallurgy (RS/PM) process in terms of microstructure refinement. In this study, hypereutectic Al-25Si-2.0Cu-1.0Mg alloy was prepared by OSPREY spray casting process. The change of strain rate sensitivity and Creep transition were analyzed by using the load relaxation test and constant creep test. High temperature deformation behavior of the hypereutectic Al-Si alloy has been investigated by applying the internal variable theory proposed by Chang et al. Especially, the creep resistance of spray casted hypereutectic Al-Si alloy can be enhanced considerably by the accumulation of prestrain.

Keywords

References

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