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.
各種検索
サポート
ヘルプ