Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Mechanical Properties of Ultrafine Grained Materials via Equal-Channel Angular Pressing

ECAP가공에 의한 초미세립 소재의 기계적 물성

  • 고영건 (포항공과대학교 신소재공학과) ;
  • 김우겸 (한양대학교 금속재료공학과) ;
  • 안정용 (한양대학교 금속재료공학과) ;
  • 박경태 (한밭대학교 신소재공학과) ;
  • 이종수 (포항공과대학교 신소재공학과) ;
  • 신동혁 (한양대학교 금속재료공학과)
  • Published : 2006.03.01
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Abstract

A study was made to investigate the microstructure and the mechanical properties of low-carbon steel, Al-Mg alloy and Ti-6Al-4V alloy each representing bcc, fcc and hcp crystal structures, respectively fabricated by equal-channel angular(ECA) pressing. After a series of ECA pressings was performed, most grains were significantly refined below ${\mu}m$ in diameter with high mis-orientation of grain boundaries irrespective of different crystal structure used. Regarding the strain hardening capability, tensile tests of ultrafine grain (UFG) dual-phase (ferrite/martensite) steel which was different from UFG ferrite-pearlite steel were carried out at ambient temperature, and corresponding mechanical properties were discussed in relation to modified C-J analysis. Low-temperature and/or high strain-rate superplasticity of the UFG Al-Mg alloy and UFG Ti-6Al-4V alloy were also studied. Based on the analysis used in this study, it was concluded that UFG alloys exhibited the enhanced mechanical properties as compared to coarse-grained (CG) counterparts.

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References

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