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Microstructure and Properties of ZM5 Alloy Repaired by Cold Welding

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Abstract

The repair of magnesium alloy castings is of great importance in terms of engineering and economic benefits. This study employs the cold welding technique to repair the ZM5 alloy, and the effects of current and preheating treatment on the microstructure and mechanical properties were investigated. The increase in current exacerbates the cracks, while the preheating treatment can effectively control them. However, the liquefaction cracks occur near the heat-affected zone after preheating at 300 °C. The microstructure of the repaired zone shows finer dendritic structure consisting of α-Mg and β-Mg17Al12 phases. After preheating treatment, the repaired zone shows the microhardness of 72 HV0.1, higher than the non-preheating samples (65 HV0.1), and the substrate (63 HV0.1). The average tensile strength of the preheated samples is 110 MPa higher than the non-preheating samples, and reaching 88.7% of the substrate. The fracture mechanism for both the substrate and repaired samples was brittle failure.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2022YFE0122600), and the China Aero Engine Group industry-university-research cooperation project (No. HFZL2021CXY025-1).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang, 110136, China

    Yi Junzhen

  2. Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process of Shenyang Aerospace University, Shenyang, 110136, China

    Yi Junzhen & Wang Chao

  3. School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang, 110136, China

    Zhang Wenqi & Yang Guang

  4. AECC Harbin Dongan Engine Co., Ltd., Harbin, 150066, China

    Cui Yanfeng

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  1. Yi Junzhen
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  2. Zhang Wenqi
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Correspondence to Wang Chao or Yang Guang.

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Junzhen, Y., Wenqi, Z., Chao, W. et al. Microstructure and Properties of ZM5 Alloy Repaired by Cold Welding. Trans Indian Inst Met (2024). https://doi.org/10.1007/s12666-023-03250-3

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  • DOI: https://doi.org/10.1007/s12666-023-03250-3

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