Mg-1.58Zn-0.52Gd (wt%) alloy was indirectly extruded at different temperatures and the resulting microstructure, texture and mechanical properties were investigated. The alloy extruded at 350 °C exhibited a typical bimodal microstructure, consisting of fine dynamically recrystallized (DRXed) grains of ~3.1 μm and coarse unDRXed grains elongated along the ED with many fine spherical Mg3Zn3Gd2 phase, and a strong [1010] fiber texture, thereby resulting in high yield strength of 283 MPa and low elongation of 10.0%. With increasing extrusion temperature, the yield strength gradually decreased mainly due to increased DRXed grain size from the Hall-Petch relation, and the elongation increased due to the weakened extrusion texture and increased DRX fraction, suppressing crack initiation at twins in coarse unDRXed grains. As a result, the alloy extruded at 400 °C showed yield strength of 161 MPa and elongation of 24.7%.
CITATION STYLE
Jiang, M. G., Chen, J. C., Yan, H., Xu, C., Nakata, T., & Kamado, S. (2017). Microstructure and mechanical properties of an extruded Mg-1.58Zn-0.52Gd alloy. In Minerals, Metals and Materials Series (Vol. Part F8, pp. 297–301). Springer International Publishing. https://doi.org/10.1007/978-3-319-52392-7_43
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