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Effect of extrusion on the microstructure and mechanical properties of a low-alloyed Mg−2Zn−0.8Sr−0.2Ca matrix composite reinforced by TiC nano-particles

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Abstract

A low-alloyed Mg−2Zn−0.8Sr−0.2Ca matrix composite reinforced by TiC nano-particles was successfully prepared by semi-solid stirring under the assistance of ultrasonic, and then the as-cast composite was hot extruded. The results indicated that the volume fraction of dynamical recrystallization and the recrystallized grain size have a certain decline at lower extrusion temperature or rate. The finest grain size of ∼0.30 µm is obtained in the sample extruded at 200°C and 0.1 mm/s. The as-extruded sample displays a strong basal texture intensity, and the basal texture intensity increases to 5.937 mud while the extrusion temperature increases from 200 to 240°C. The ultra-high mechanical properties (ultimate tensile strength of 480.2 MPa, yield strength of 462 MPa) are obtained after extrusion at 200°C with a rate of 0.1 mm/s. Among all strengthening mechanisms for the present composite, the grain refinement contributes the most to the increase in strength. A mixture of cleavage facets and dimples were observed in the fracture surfaces of three as-extruded nanocomposites, which explain a mix of brittle-ductile fracture way of the samples.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51771129, 51401144, and 51771128); the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi, China; the Natural Science Foundation of Shanxi Province, China (Nos. 2015021067 and 201601D011034); the Projects of International Cooperation in Shanxi, China (No. 201703D421039).

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  1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Zedong Wang, Kaibo Nie, Kunkun Deng & Jungang Han

  2. Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, Taiyuan, 030024, China

    Kaibo Nie & Kunkun Deng

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  1. Zedong Wang
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  2. Kaibo Nie
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Correspondence to Kaibo Nie.

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Wang, Z., Nie, K., Deng, K. et al. Effect of extrusion on the microstructure and mechanical properties of a low-alloyed Mg−2Zn−0.8Sr−0.2Ca matrix composite reinforced by TiC nano-particles. Int J Miner Metall Mater 29, 1981–1990 (2022). https://doi.org/10.1007/s12613-021-2353-8

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