Abstract
In order to investigate the relationships between microstructure and mechanical properties of extruded Mg–9mass%Al–1mass%Zn–2mass%Ca (AZX912) alloy, the AZX912 alloy ingots with and without solution treatment (ST) were extruded at a low temperature of 523 K, and some extrusions were subsequently annealed at 473–573 K. The as-extruded bar exhibited dynamically recrystallized fine grains, and the amount of fine Mg17Al12 precipitates in grains. Grain coarsening occurred with an increased grain size from ~2 to ~8 μm after annealing. Solution treatment seems to affect grain coarsening during extrusion. All extruded bars exhibited basal texture, and the extruded bar annealed at 573 K exhibited slightly lower texture intensity than the others. The extruded bar exhibited high mechanical strength of 377 MPa and medium elongation of 6.6%, when solution treatment before extrusion and final annealing were not applied. The high mechanical strength was likely attributed to the small grain size, large work hardening and a great amount of fine Mg17Al12 precipitates in the extrusions.
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Acknowledgements
This proceeding is based on results obtained from Future Pioneering Program “Innovative Structural Materials Project” commissioned by the New Energy and Industrial Technology Development Organization (NEDO), Japan.
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Huang, X., Chino, Y., Ueda, H., Inoue, M., Kido, F., Matsumoto, T. (2017). Enhanced Mechanical Properties of Extruded Mg–9mass%Al–1mass%Zn–2mass%Ca Alloy. In: Solanki, K., Orlov, D., Singh, A., Neelameggham, N. (eds) Magnesium Technology 2017. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-52392-7_39
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DOI: https://doi.org/10.1007/978-3-319-52392-7_39
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