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Fracture morphology and crack mechanism in pure polycrystalline magnesium under tension–compression fatigue testing

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Abstract

The fatigue fracture was characterized and the fracture behavior was analyzed, using scanning electron microscope (SEM) and electron back-scattered diffraction (EBSD), the fatigue tests of two strain amplitude at room temperature were 0.5% and 1.0% respectively, and the results showed that the fatigue deformation of different strain amplitude produced two typical fatigue fracture morphology, and when the strain amplitude was 1.0%, fatigue fracture mechanism of AZ31 magnesium alloy induced by \(\{ 10\bar{1}2\}\) twins, when the strain amplitude is 0.5%, it was induced by \(\{ 10\bar{1}2\} - \{ 10\bar{1}2\}\) double twins. In the present study, the average thickness of primary twin is ~ 20 μm at amplitude of 0.5% and ~ 80 μm at amplitude of 1.0%. The thickness of \(\{ 10\bar{1}2\}\) primary twins was large enough to activate \(\{ 10\bar{1}2\} - \{ 10\bar{1}2\}\) secondary twins at a high strain amplitude, while the thickness of \(\{ 10\bar{1}2\}\) primary twins was too narrow to activate \(\{ 10\bar{1}2\} - \{ 10\bar{1}2\}\) secondary twins at a low strain amplitude.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51671040, 50890170 and 51421001), the National Basic Research Program of China (No. 2010CB631004).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400045, China

    Li Tan, Xi-Yan Zhang, Ting Xia, Guang-Jie Huang & Qing Liu

  2. National Engineering Research Centre for Magnesium Alloy, Chongqing University, Chongqing, 400045, China

    Qing Liu

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  1. Li Tan
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  2. Xi-Yan Zhang
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Correspondence to Xi-Yan Zhang.

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Tan, L., Zhang, XY., Xia, T. et al. Fracture morphology and crack mechanism in pure polycrystalline magnesium under tension–compression fatigue testing. Rare Met. 39, 162–168 (2020). https://doi.org/10.1007/s12598-018-01200-3

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  • DOI: https://doi.org/10.1007/s12598-018-01200-3

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