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Effects of Mg Content on the Fatigue Strength and Fracture Behavior of Al-Si-Mg Casting Alloys

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Abstract

In order to investigate the influence of Mg content on the fatigue properties in Al-Si-Mg alloy, uniaxial tensile tests and rotating bending fatigue tests were conducted on two Al-7Si-Mg casting alloys, with different Mg contents of 0.3 and 0.6 wt.%. The fracture surfaces of the specimens were observed by scanning electron microscopy, and the fatigue crack growth process was obtained by the replica method. The results indicate that the increase in Mg content enhances the yield strength and tensile strength of the alloy, whereas it reduces its elongation. There is an obvious knee point in the S–N curves of Al-7Si-0.6Mg alloy while that of Al-7Si-0.3Mg alloy shows continuous decrease. The fatigue strength at 5 × 105 cycles is 60 MPa for Al-7Si-0.3Mg alloy and 80 MPa for Al-7Si-0.6Mg alloy. For the two types of specimens, the fatigue failure can initiate from crystal slip and casting defects. The replica results suggest that cracks in Al-7Si-0.6Mg alloy grow more slowly than that in Al-7Si-0.3Mg alloy.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (Nos. U1534209, 51675445) and Fundamental Research Funds for the Central Universities (No. 2682017CX039).

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Authors and Affiliations

  1. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, 610031, China

    Ming-Ze Wu, Ji-Wang Zhang & Hua-Qiang Wang

  2. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    Yan-Bin Zhang

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  1. Ming-Ze Wu
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  2. Ji-Wang Zhang
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  4. Hua-Qiang Wang
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Correspondence to Ji-Wang Zhang.

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Wu, MZ., Zhang, JW., Zhang, YB. et al. Effects of Mg Content on the Fatigue Strength and Fracture Behavior of Al-Si-Mg Casting Alloys. J. of Materi Eng and Perform 27, 5992–6003 (2018). https://doi.org/10.1007/s11665-018-3688-9

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  • DOI: https://doi.org/10.1007/s11665-018-3688-9

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