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Superplastic Behavior of Magnesium Alloy Processed by ECAE

An AZ91 magnesium alloy with a very small grain size of less than 1 μm was processed by equal channel angular extrusion (ECAE). The alloy showed a large elongation of 661 % at a low temperature of 473 K, which is 0.5 T m . Grain boundaries of the alloy were in a non-equilibrium state.