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Microstructures and mechanical properties of AZ91 alloys prepared by multi-pass friction stir processing

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Abstract

AZ91 magnesium plates with a thickness of 6 mm were subjected to one- and two-pass friction stir processing (FSP). Microstructures and mechanical properties of the experimental materials were investigated. The results show that FSP can significantly refine the microstructures of magnesium alloys, and two-pass FSP can prepare slightly finer grains in comparison with one-pass FSP. Some coarse β-Mg17Al12 phases existed in the first pass FSP break and dissolve into the matrix under the action of the second pass FSP. Microhardness distribution of the two-pass FSP AZ91 alloy exhibits no too much difference with that of the one-pass FSP AZ91 alloy. Due to further finer microstructures, the tensile properties of the two-pass FSP alloy are slightly higher than those of the one-pass FSP alloy. Both FSP AZ91 alloys show typical ductile fracture characteristics, while the dimples on the two-pass FSP specimen are much deeper and increase in quantity.

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ACKNOWLEDGMENTS

This work was supported by the Fundamental Research Funds for Central University under Grant Nos. (WUT: 2017IVA033 and WUT: 2016IVA032), the 111 Project (B17034) and Open Foundation of National Engineering Research Center of Near-net-shape Forming for Metallic Materials of South China University of Technology under Grant No. 201510.

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Authors and Affiliations

  1. Hubei Key Laboratory of Advanced Technology (Wuhan University of Technology), Wuhan, 430070, China

    Fang Chai, Fei Yan, Wei Wang, Qichen Lu & Xiang Fang

  2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan, 430070, China

    Fang Chai, Fei Yan, Wei Wang, Qichen Lu & Xiang Fang

  3. School of Automotive Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Fang Chai, Fei Yan, Wei Wang, Qichen Lu & Xiang Fang

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  1. Fang Chai
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  2. Fei Yan
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  3. Wei Wang
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  4. Qichen Lu
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  5. Xiang Fang
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Correspondence to Wei Wang.

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Chai, F., Yan, F., Wang, W. et al. Microstructures and mechanical properties of AZ91 alloys prepared by multi-pass friction stir processing. Journal of Materials Research 33, 1789–1796 (2018). https://doi.org/10.1557/jmr.2018.98

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  • DOI: https://doi.org/10.1557/jmr.2018.98

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