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Microstructure, Texture Evolution, and Mechanical Properties of ECAP-Processed ZAT522 Magnesium Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In this work, the high-strength Mg–5Zn–2Al–2Sn (ZAT522, in wt%) Mg alloys was obtained at 220 °C and 130 °C by a two-step equal channel angular pressing (ECAP). For each stage, two passes were used. The results showed a remarkable grain refinement after the first stage of ECAP (A2 samples), leading to a fine-grained structure with average size of 1.40 μm. The additional stage (A4 samples) caused further grain refinement to 1.18 μm, and an ultra-fine grain structure (700 nm) appeared in the precipitate-rich region. The grain refinement mechanism for both samples was discussed in detail. To this end, the original extrusion fiber texture evolved into a new strong texture characterized by the base planes tilted toward the ECAP shear plane, with a higher Schmid factor value of 0.34. Compared with the as-extruded alloy, the yield strength of the A2 samples increased from 180 to 245 MPa, which was mainly attributed to the combined effects of grain boundary strengthening and precipitation strengthening. In the case of A4 samples, the dislocation strengthening resulted in a net increase in yield strength to 335 MPa, while the ductility was significantly reduced.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant Nos. 51874209 and 51771129).

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Authors and Affiliations

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

    Ying Ma, Fu-Yin Han, Cheng Liu & Ming-Zhe Li

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

    Fu-Yin Han

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  1. Ying Ma
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  2. Fu-Yin Han
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  3. Cheng Liu
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  4. Ming-Zhe Li
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Correspondence to Fu-Yin Han.

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Ma, Y., Han, FY., Liu, C. et al. Microstructure, Texture Evolution, and Mechanical Properties of ECAP-Processed ZAT522 Magnesium Alloy. Acta Metall. Sin. (Engl. Lett.) 33, 233–242 (2020). https://doi.org/10.1007/s40195-019-00969-1

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  • DOI: https://doi.org/10.1007/s40195-019-00969-1

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