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High cycle fatigue properties of cast Mg–xNd–0.2Zn–Zr alloys

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Abstract

The tensile and fatigue strength of cast Mg–xNd–0.2Zn–0.45Zr alloys (x = 0, 1, 2, 3 wt%) in both solution-treated (T4) and solution + 200 °C peak-aged (T6-PA) conditions were investigated in the present study. The results indicate that Neodymium (Nd) is an effective element to improve both the tensile and fatigue properties of cast Mg–0.2Zn–Zr alloys. The strengthening effect depends on its content in a way of power function (σ = σ0 + K C Nd n), where the power exponent n is about 0.52–0.54 for yield strength (YS) and 0.59–0.61 for fatigue strength. The yield strengthening effect of Nd element in the form of precipitates (T6-PA) is about three times of that as solution atoms (T4), while the fatigue strengthening effect of Nd element in the form of precipitates is only about 50 % higher than that as solution atoms. The improved strength (both YS and ultimate tensile strength) can lead to the same amount improvement of the fatigue strength in T4-treated alloys, while only can cause less than half improvement of the fatigue strength in T6-PA-treated alloys.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51201103). The authors are grateful to Prof. Wengjiang Ding (SJTU), Dr. Qigui Wang (GM) and Dr. Alan. Luo (GM) for their helpful discussions.

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Authors and Affiliations

  1. National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200030, Shanghai, People’s Republic of China

    Liming Peng, Penghuai Fu, Zhenming Li, Yingxin Wang & Haiyan Jiang

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  1. Liming Peng
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  2. Penghuai Fu
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  3. Zhenming Li
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  4. Yingxin Wang
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Correspondence to Penghuai Fu.

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Peng, L., Fu, P., Li, Z. et al. High cycle fatigue properties of cast Mg–xNd–0.2Zn–Zr alloys. J Mater Sci 49, 7105–7115 (2014). https://doi.org/10.1007/s10853-014-8417-7

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  • DOI: https://doi.org/10.1007/s10853-014-8417-7

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