Abstract
The microstructure, texture, residual stress, and tensile properties of Mg–6Zn–2Y–1La–0.5Zr (wt%) magnesium alloy were investigated before and after extrusion process, which performed at 300 °C and 400 °C. The microstructural characterizations indicated that the as-cast alloy was comprised of α-Mg, Mg–Zn, Mg–Zn–La, and Mg–Zn–Y phases. During homogenization at 400 °C for 24 h, most of the secondary phases exhibited partial dissolution. Extrusion process led to a remarkable grain refinement due to dynamic recrystallization (DRX). The degree of DRX and the DRXed grain size increased with increasing extrusion temperature. The homogenized alloy did not show a preferential crystallographic orientation, whereas the extruded alloys showed strong basal texture. The extrusion process led to a significant improvement on the compressive residual stress and mechanical properties. The alloy extruded at 300 °C exhibited the highest basal texture intensity, the compressive residual stress and hardness, and yield and tensile strengths among the studied alloys.
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This study is financially supported by the Scientific Research Projects of Karabuk University (KBU-BAP-16/1-DR-075).
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Zengin, H., Turen, Y., Turan, M.E. et al. Evolution of Microstructure, Residual Stress, and Tensile Properties of Mg–Zn–Y–La–Zr Magnesium Alloy Processed by Extrusion. Acta Metall. Sin. (Engl. Lett.) 32, 1309–1319 (2019). https://doi.org/10.1007/s40195-019-00901-7
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DOI: https://doi.org/10.1007/s40195-019-00901-7