Influence of temperature of ECAP processing on the microstructure and microhardness of as-cast AX41 alloy

Abstract

The influence of the temperature of ECAP processing on the microstructure and mechanical properties of commercial as-cast AX41 magnesium was investigated. ECAP processing was conducted at temperatures of 220 °C and 250 °C up to N = 8 passes via route Bc. The original grain size of 200 μm was found to decrease with increasing number of passes at both temperatures. After 8 passes, the grain size of 1.4 μm and 2.6 μm was obtained at 220 °C and 250 °C, respectively. This difference was attributed to the suppressed dynamic recrystallization for N > 2 caused by substantial decrease in dislocation density of \( \left\{ {10\bar{1}0} \right\}11\bar{2}0 \) prismatic and \( \left\{ {10\bar{1}1} \right\}11\bar{2}3 \) pyramidal <a>-type edge dislocations and more pronounced high-temperature grain growth at 250 °C. Despite the different grain sizes, similar crystallographic textures and dislocation densities were observed at both temperatures after 8 passes. The microhardness values increased up to 4 passes at both temperatures in accordance with the variation of the grain size, indicating the dominance of Hall–Petch strengthening.

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Acknowledgements

This work was financially supported by the Czech Science Foundation under the Project 19-00270S. Financial support by ERDF under the Project CZ.02.1.01/0.0/0.0/15_003/0000485 is also gratefully acknowledged. J.G. acknowledges financial support by the Ministry of Human Capacities of Hungary within the ELTE University Excellence Program (1783-3/2018/FEKUTSRAT).

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Correspondence to Tomáš Krajňák.

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Krajňák, T., Minárik, P., Stráská, J. et al. Influence of temperature of ECAP processing on the microstructure and microhardness of as-cast AX41 alloy. J Mater Sci 55, 3118–3129 (2020). https://doi.org/10.1007/s10853-019-04171-7

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