Abstract
The Zn–22% Al eutectoid alloy is capable of exhibiting very high superplastic elongations, in excess of 2000% in tension, when the grain size is in the range of ~1–10 μm. This paper describes the fabrication of a submicrometer grain size in the Zn–22% Al alloy by subjecting the samples to intense plastic straining in torsion under high pressure (~5 GPa) at room temperature. Observations after straining revealed a heterogeneous microstructure with grain sizes in the range of ~0.1–0.5 μm. As a result of the low melting temperature of the alloy, the high internal stresses introduced by torsion straining are relaxed and the grain boundaries are close to an equilibrium configuration.
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Furukawa, M., Horita, Z., Nemoto, M. et al. Fabrication of submicrometer-grained Zn–22% Al by torsion straining. Journal of Materials Research 11, 2128–2130 (1996). https://doi.org/10.1557/JMR.1996.0270
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DOI: https://doi.org/10.1557/JMR.1996.0270