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High cycle fatigue behavior of as-extruded ZK60 magnesium alloy

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Abstract

Tensile and high cycle fatigue properties of hot extruded ZK60 magnesium alloy have been investigated, in comparison to that of hot-extruded plus T5 heat-treated ZK60 magnesium alloy which was named as ZK60-T5. High cycle fatigue tests were carried out at a stress rate (R) of −1 and a frequency of 100 Hz using hour-glass-shaped round specimens with a gage diameter of 5.8 mm. The results show that tensile strength greatly improved and elongation is also slightly enhanced after T5 heat treatment, and the fatigue strength (at 107 cycles) of ZK60 magnesium alloy increases from 140 to 150 MPa after T5 heat treatment, i.e., the improvement of 7% in fatigue strength has been achieved. Results of microstructure observation suggest that improvement of mechanical properties of ZK60 magnesium alloy is due to precipitation strengthening phase and texture strengthening by T5 heat treatment. In addition, fatigue crack initiations of ZK60 and ZK60-T5 magnesium alloys were observed to occur from the specimen surface and crack propagation was characterized by striation-like features coupled with secondary cracks.

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Acknowledgements

This project is sponsored by National Ministry of Science and Technology (Grant No. 2007CB613703), Shanghai Pujiang Program (Grant No. 06PJ14062), and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, ROC.

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Authors and Affiliations

  1. National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    W. C. Liu, J. Dong, Z. Y. Yao, C. Q. Zhai & W. J. Ding

  2. Lehrstuhl Metallkunde und Werkstofftechnik, BTU-Cottbus, Postfach 101344, 03013, Cottbus, Germany

    P. Zhang

  3. Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    C. Q. Zhai & W. J. Ding

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  1. W. C. Liu
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  2. J. Dong
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  3. P. Zhang
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  4. Z. Y. Yao
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Correspondence to J. Dong.

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Liu, W.C., Dong, J., Zhang, P. et al. High cycle fatigue behavior of as-extruded ZK60 magnesium alloy. J Mater Sci 44, 2916–2924 (2009). https://doi.org/10.1007/s10853-009-3385-z

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