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Effect of Ca/Al Ratio on Microstructure and Mechanical Properties of Slow Extrusion High-Strength Mg-Al-Ca-Mn Alloys

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Abstract

The role of different Ca/Al mass ratios (ranging from 0.2 to 1.4) in modifying the microstructure, phase evolution and the mechanical properties of Mg-Al-Ca-Mn alloys was investigated. The primary second phase evolves from blocky Mg17Al12 to semi-continuous Al2Ca and then to the reticular (Mg, Al)2Ca phase and Mg2Ca phase when the Ca/Al ratio rises. Meanwhile, the average grain sizes decrease from 1.5 to 0.5 μm. Therefore, the fine grain strengthening effect of the as-extruded alloy is enhanced. The broken second phases exhibit a banding distribution along the extrusion direction, and their dimension is approximately 3 ~ 5 μm. These second phases not only refined grains but also hinder dislocation migration, resulting in dislocation accumulation and increase in dislocation density, which strengthens the alloy further. Furthermore, increasing the Ca/Al ratio causes the recrystallization degree decrease, which means more undynamically recrystallized grains with numerous residual dislocations and higher basal texture strengthening. The optimum grain orientation changes from < 11–20 > to < 10–10 > as the Ca/Al ratio increases, and the Schmid factor of the as-extruded AXM2306 alloy is smaller than that of the AXM4106 alloy. The tensile yield strength and ultimate tensile strength of as-extruded Mg-2.0Al-2.8Ca-0.6Mn alloy were ~ 401.8 and ~ 426.2 MPa, respectively.

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Acknowledgements

This work was supported by the “National Natural Science Foundation of China” (Grants. 51771129, 52001223 and 51771128). The authors also thank for the Support from the “National Key Research and Development Program for Young Scientists” (Grant. 2021YFB3703300) and the special fund project for guiding local science and technology development by the central government (Grant. YDZJSX2021B019).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, People’s Republic of China

    Shilei Wang, Kaibo Nie, An Yang & Kunkun Deng

  2. Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan, 030024, People’s Republic of China

    Kaibo Nie & Kunkun Deng

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  1. Shilei Wang
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Wang, S., Nie, K., Yang, A. et al. Effect of Ca/Al Ratio on Microstructure and Mechanical Properties of Slow Extrusion High-Strength Mg-Al-Ca-Mn Alloys. J. of Materi Eng and Perform 32, 3129–3141 (2023). https://doi.org/10.1007/s11665-022-07283-5

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