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Strengthening Mechanism of Room Temperature Mechanical Properties for AZ31 Magnesium Alloy by Continuous Variable Cross section Direct Extrusion

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Abstract

AZ31 magnesium alloy has poor plastic deformation ability at room temperature due to its hexagonal close-packed (HCP) structure. For traditional plastic forming processes, such as extrusion processes, they can improve the mechanical properties of AZ31 magnesium alloy within a certain range at room temperature. But the coordinated deformation of twin mechanism cannot be neglected during the plastic deformation process. The mechanical properties of AZ31 magnesium alloy exhibit tension–compression yield asymmetry (TCYA). These characteristics of AZ31 magnesium alloy have caused restrictions. As a short forming/preparing integrated process, CVCDE can increase the yield strength (YS) of AZ31 magnesium alloy while effectively improving the TCYA of AZ31 magnesium alloy. In this study, the uniaxial compression test is employed and the quantitative evaluation of the AZ31 magnesium alloy TCYA is carried out by means of the SDE coefficient. With the aid of scanning electron microscopes (SEM) and electron backscattered diffraction (EBSD), the test results indicate that the fracture morphology has changed significantly with the increase in CVCDE interim. The distribution of tear ridges in the fracture area tends to be uniform and the number of dimples increases significantly. The dimples also present a trend of deepening. From the twin distribution, the proportion of {10-12} tensile twins (TTWs) decreased after the AZ31 magnesium alloy processed by CVCDE. This is conducive to the YS in the compression process and the improvement of the TCYA can be obtained.

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Acknowledgments

This project is supported by National Natural Science Foundation of China (No. 51975166).

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  1. School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin, 150040, People’s Republic of China

    Nan Bian, Feng Li, Ye Wang & Chao Li

  2. Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, People’s Republic of China

    Feng Li

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Bian, N., Li, F., Wang, Y. et al. Strengthening Mechanism of Room Temperature Mechanical Properties for AZ31 Magnesium Alloy by Continuous Variable Cross section Direct Extrusion. J. of Materi Eng and Perform 30, 9215–9226 (2021). https://doi.org/10.1007/s11665-021-06111-6

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