Korean Journal of Metals and Materials (대한금속재료학회지)

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

High Strain Rate Deformation Behavior of 5083 Aluminum Alloy Prepared via Equal Channel Angular Extrusion

ECAE 전단 가공된 5083 알루미늄 합금의 고변형률 변형거동

  • Kim, Yang Gon (Center for Advanced Aerospace Materials, Pohang University of Science and Technology) ;
  • Ko, Young Gun (School of Materials Science and Engineering, Yeungnam University) ;
  • Shin, Dong Hyuk (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Lee, Sunghak (Center for Advanced Aerospace Materials, Pohang University of Science and Technology)
  • 김양곤 (포항공과대학교 항공재료연구센터) ;
  • 고영건 (영남대학교 신소재공학부) ;
  • 신동혁 (한양대학교 금속재료공학과) ;
  • 이성학 (포항공과대학교 항공재료연구센터)
  • Received : 2009.04.14
  • Published : 2009.07.25
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Abstract

The high strain rate deformation behavior of ultra-fine grained 5083 aluminum alloys prepared via equal channel angular (ECA) extrusion was investigated in this study. The microstructure of ECA extruded specimens consisted of ultra-fine grains, and contained a considerable amount of second phase particles, which were fragmented and distributed homogeneously in the matrix. According to the dynamic torsion test results, the maximum shear stress and fracture shear strain of the route A (no rotation) specimen were lower than those of route C ($180^{\circ}$ rotation) specimen since that adiabatic shear bands of $100{\mu}m$ in width were formed in the route A specimen. The formation of adiabatic shear bands was addressed by concepts of critical shear strain, deformation energy required for void initiation, and microstructural homogeneity associated with ECA operations.

Keywords

Acknowledgement

Supported by : 과학기술부, 한국학술진흥재단

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