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http://dx.doi.org/10.5228/KSPP.2006.15.2.105

Mechanical Properties of Ultrafine Grained Materials via Equal-Channel Angular Pressing  

Ko, Y.G. (포항공과대학교 신소재공학과)
Kim, W.G. (한양대학교 금속재료공학과)
Ahn, J.Y. (한양대학교 금속재료공학과)
Park, K.T. (한밭대학교 신소재공학과)
Lee, C.S. (포항공과대학교 신소재공학과)
Shin, D.H. (한양대학교 금속재료공학과)
Publication Information
Transactions of Materials Processing / v.15, no.2, 2006 , pp. 105-111 More about this Journal
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.
Keywords
Ultrafine Grain; Equal-Channel Angular Pressing; Low-Carbon Steel; Al-Mg Alloy; Ti-6Al-4V Alloy;
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