Abstract
Ultra-fine-grained Zn-0.5Mn alloy was prepared by multi-pass hot extrusion. Minimum grain size of the Zn-0.5Mn alloy was about 0.35 µm, it exhibited room temperature superplasticity. During multi-pass extrusion, the pinning force of MnZn13 rendered the subgrains stable and restrained grain growth. The ultra-fine grain was finally formed.
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