Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Low Cycle Fatigue and Serration Behavior of Plastically Deformed and Annealed 5052 Al Alloy

5052 Al 합금의 소성가공 및 열처리에 따른 피로거동 및 serration의 변화

  • Cha, J.H. (Department of Materials Science & Engineering, Korea University) ;
  • Kwun, S.I. (Department of Materials Science & Engineering, Korea University)
  • 차주호 (고려대학교 신소재공학과) ;
  • 권숙인 (고려대학교 신소재공학과)
  • Received : 2010.03.12
  • Accepted : 2010.03.23
  • Published : 2010.05.30
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Abstract

The LCF (low cycle fatigue) behavior and the serration phenomena in the plastically deformed and non-deformed 5052 Al alloy were investigated. The plastic deformation was performed by 1 pass or 4 passes in ECAP (equal channel angular pressing) followed by annealing. Only cyclic hardening continued from the beginning until fracture at all strain amplitudes during LCF in the non-deformed alloy, which was caused by the increase in dislocation density during fatigue. Slight cyclic hardening followed by plateau until fracture was observed during LCF in the ECAPed alloy, which was caused by the slight increase in dislocation density in the beginning and then keeping constant in dislocation density afterward until fracture by forming subgrains in this stage of fatigue. The serrations on the stress-strain curves of this alloy were observed, which indicate that the dynamic strain aging (DSA) is occurring during plastic deformation. The variation in amplitudes of serration was studied by changing the strain rate in tensile or fatigue tests.

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References

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