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Experimental Study on the Elastic–plastic Transitions of the Hetero-structured High Pressure Die Casting Mg–Al-RE Alloy

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Abstract

Background

High pressure die casting (HPDC) Mg alloy has a hetero-structure in which the microstructures gradually coarsen from the casting surface to the interior, leading to the different elastic–plastic (E-P) transitional behaviors among the layers.

Objective

In this paper, we quantitively determined the diverse E-P transitions among the HPDC layers and related them to the microstructural evolution.

Methods

To investigate independently the E-P transitional behavior of the layer, the surface, middle, and central layers were deliberately sliced in sequence from the casting surface to the interior of the HPDC Mg-4Al-5.7RE (in wt.%) component. The onset and the end of E-P transition in each layer were quantitively determined by cyclic tensile test and Kocks-Mecking analysis, respectively.

Results

It was found that the plastic deformation for all layers occurred in the first unloading loop near zero strain, indicating the start of the E-P transition. With increasing strain, the E-P transition ended first in the middle layer at 0.0081 strain due to the lowest fraction of the second phases and ended last at the small-grained surface layer at 0.0090 strain. Excluding the twinning-dependent anelastic strain, the E-P transitions ended in advance at the strains of 0.0059 and 0.0062 in the middle and surface layer, respectively.

Conclusions

A combination of cyclic tensile test and Kocks-Mecking analysis provided a method to quantitively determine the diverse E-P transitions among the HPDC layers resulted from the hetero-structure regarding grains, the second phases, and twins.

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Notes

  1. Although the Bauschinger effect does contribute to the anelasticity of the whole casting sample during deformation, the reversible twinning is still the major cause of anelasticity.

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Acknowledgments

This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFB0301001) and the National Natural Science Foundation of China (NSFC, Grant Nos. U1902220 and 51674166).

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Authors and Affiliations

  1. National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai Jiao Tong University, Shanghai, 200240, China

    J. Wei, Q. D. Wang, M. Ebrahimi, L. Zhang, H. Y. Jiang & W. J. Ding

  2. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    D. D. Yin

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  1. J. Wei
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Correspondence to Q. D. Wang.

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Wei, J., Wang, Q.D., Ebrahimi, M. et al. Experimental Study on the Elastic–plastic Transitions of the Hetero-structured High Pressure Die Casting Mg–Al-RE Alloy. Exp Mech 61, 1143–1152 (2021). https://doi.org/10.1007/s11340-021-00724-7

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