Dynamic deformation behavior of ultrafine grained aluminum produced by ARB and subsequent annealing
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Commercial purity aluminum (1100-Al) sheets with various grain sizes, ranging from 0.2 to 10 μm, were fabricated through accumulative roll bonding (ARB) and subsequent annealing at various temperatures. Mechanical properties of these materials were examined at various strain rates ranging from 10−2 to 103 s−1 (from quasi-static deformation to dynamic deformation). Yield strength of the UFG specimens did not change so much when the strain rate changed. Yielding behavior of the UFG Al with grain size of 1.4 µm was characterized by yield-drop phenomenon, which appeared at higher strain rate. It was found that strain-hardening of the Al matrix was significantly enhanced at high strain rates, which was independent of the grain size. Uniform elongation increased with increasing strain rate in the specimens with the grain size larger than 1 µm, while post-uniform elongation increased with increasing strain rate in the submicrometer grain-sized specimens. Consequently, total elongation of all specimens was improved as the strain rate increased.
KeywordsHigh Strain Rate Accumulative Roll Bonding Total Elongation Uniform Elongation Increase Strain Rate
The authors would like to thank for the financial supports by the Grant-in-Aid for Young Scientist (Start Up) (No. 18860051), Grant-in-Aid for scientific research from the ministry of education on priority areas “Giant straining process for advanced materials containing ultra-high density lattice defects”, and Industrial Technology research Grain Program ‘05 through New Energy and Industrial Technology Development Organization (NEDO) of Japan (project ID: 05A27502d).
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