Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지

Effect of Annealing Temperature on Dynamic Deformation Behavior of Ultra-Fine-Grained Aluminum Alloys Fabricated by Equal Channel Angular Pressing

ECAP으로 제조된 초미세립 알루미늄 합금의 동적 변형거동에 미치는 어닐링 온도의 영향

  • Kim, Yang Gon (Department of Materials Science and Engineering, Pohang University of Science and Technology) ;
  • Ko, Young Gun (Department of Materials Science and Engineering, Massachusetts Institute of Technology) ;
  • Shin, Dong Hyuk (Department of Metallurgy and Materials Science,Hanyang University) ;
  • Lee, Chong Soo (Department of Materials Science and Engineering, Pohang University of Science and Technology) ;
  • Lee, Sunghak (Department of Materials Science and Engineering, Pohang University of Science and Technology)
  • 김양곤 (포항공과대학교 신소재공학과) ;
  • 고영건 (메사추세츠 공과대학 재료공학과) ;
  • 신동혁 (한양대학교 금속재료공학과) ;
  • 이종수 (포항공과대학교 신소재공학과) ;
  • 이성학 (포항공과대학교 신소재공학과)
  • Received : 2008.06.24
  • Published : 2008.09.25
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Abstract

The influence of annealing treatment on dynamic deformation behavior of ultra-fine grained aluminum alloys was investigated in this study. After equal-channel angular pressing at $200^{\circ}C$, most of the grains were considerably reduced to nearly equiaxed grains of $0.3{\mu}m$ in size. With an increment of various annealing treatments for 1 hour, resultant microstructures were found to be fairly stable at temperatures up to $200^{\circ}C$, suggesting that static recovery would be dominantly operative, whereas grain growth was pronounced above $250^{\circ}C$. The tensile test results showed that yield and ultimate tensile strengths decreased, but elongation-to-failure and strain hardening rate increased with increasing annealing temperature. The dynamic deformation behavior retrieved with a series of torsional tests was explored with respect to annealed microstructures. Such mechanical response was analyzed in relation to resultant microstructure and fracture mode.

Keywords

Acknowledgement

Supported by : 과학기술부, 한국학술진흥재단

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