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Effect of aging treatment on mechanical properties and fracture behavior of friction stir processed Mg–Y–Nd alloy

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Abstract

In this study, precipitation behavior of Mg–Y–Nd cast alloy during friction stir processing (FSP), and the effect of subsequent artificial aging on mechanical properties and fracture behavior of the FSP alloy were investigated. It is found that the coarse α-Mg grains and large second phases are greatly refined after FSP. Moreover, due to the heat input during processing and the natural cooling, β′ and β1 precipitates are also observed in the FSP alloy. The FSP specimens were subjected to subsequent artificial aging treatment, and the peak hardness is obtained at 150 °C for 54 h and 180 °C for 30 h. Strengths of the peak–aged specimens are further increased, which is attributed to the large quantity of β″ and β1 precipitates, respectively. Meanwhile, elongations of the peak-aged specimens are both decreased. Due to the comprehensive effects of banded structures and fine grains, failure mechanisms of FSP and peak-aged specimens are all mixed ductile–brittle fracture mode. However, compared to the FSP specimens, different fracture paths are exhibited in peak–aged specimens.

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Acknowledgements

This work was sponsored by the Research Fund for the Doctoral Program of Higher Education of China (No. 20130172110044), by the Fundamental Research Funds for the Central Universities (No. 2014ZG0028), and by the Natural Science Foundation of Guangdong for Research Team (No. 2015A030312003).

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Authors and Affiliations

  1. National Engineering Research Center of Near–Net Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, People’s Republic of China

    Genghua Cao, Datong Zhang, Xicai Luo, Weiwen Zhang & Wen Zhang

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  1. Genghua Cao
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  2. Datong Zhang
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  4. Weiwen Zhang
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Correspondence to Datong Zhang.

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Cao, G., Zhang, D., Luo, X. et al. Effect of aging treatment on mechanical properties and fracture behavior of friction stir processed Mg–Y–Nd alloy. J Mater Sci 51, 7571–7584 (2016). https://doi.org/10.1007/s10853-016-0036-z

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  • DOI: https://doi.org/10.1007/s10853-016-0036-z

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