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Tribological Behavior of Mg97Zn1Y2 Alloy at Elevated Temperatures of 50-200 °C

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Abstract

The tribological behavior of Mg97Zn1Y2 alloy was investigated using a pin-on-disk wear machine at wear temperatures of 50-200 °C. Morphologies and chemical compositions of worn surfaces were analyzed using scanning electron microscope and energy-dispersive x-ray spectrometer. The microstructural evolution and hardness change in subsurfaces were examined by optical microscopy and hardness tester. The results showed that the wear temperature had significant influence on the coefficient of friction and wear rate. At wear temperatures of 50-200 °C, with increasing applied load, the coefficient of friction went down rapidly then turned to decrease slowly in the mild wear regime, and continuously decreased modestly until the largest applied load in the severe wear regime. Increasing wear temperature from 50 to 200 °C decreased the mild to severe wear transition load linearly from 120 to 60 N. In the mild wear regime, the main wear mechanisms were identified as abrasion + oxidation and delamination + surface oxidation at 50-150 °C, and delamination at 200 °C, while in the severe wear regime, the main wear mechanisms were identified as severe plastic deformation + spallation of oxide layer and surface melting at 50-150 °C, and severe plastic deformation and surface melting at 200 °C. The microstructural transformation from the deformed to the dynamically recrystallized (DRX), and hardness change from the strain hardening to softening were found in the subsurfaces before and after mild to severe transition. The DRX softening mechanism was determined for mild to severe wear transition at 50-200 °C. A wear transition map was constructed for Mg97Zn1Y2 alloy on applied load versus wear temperature.

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Acknowledgments

The authors wish to express their gratitude for the support under the Project 985-automotive engineering of Jilin University, National Foundation of Doctoral Station (Grant No.20110061110031).

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Authors and Affiliations

  1. Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, 130025, People’s Republic of China

    J. An, J. H. Feng & X. H. Yan

  2. School of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, People’s Republic of China

    R. G. Li

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An, J., Feng, J.H., Yan, X.H. et al. Tribological Behavior of Mg97Zn1Y2 Alloy at Elevated Temperatures of 50-200 °C. J. of Materi Eng and Perform 26, 4940–4952 (2017). https://doi.org/10.1007/s11665-017-2926-x

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  • DOI: https://doi.org/10.1007/s11665-017-2926-x

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