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Influence of Multidirectional Forging on Microstructural, Mechanical, and Corrosion Behavior of Mg-Zn Alloy

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Abstract

Multidirectional forging (MDF) was applied to Mg-6%Zn alloy up to 5 passes successfully at 280 °C. MDF-processed materials were characterized using optical microscope, scanning electron microscope, electron backscatter diffraction, transmission electron microscope, and x-ray diffraction. Obtained results showed a significant reduction in grain size (up to 3.8 μm) having a large fraction of high-angle grain boundaries after 5 passes of MDF process. Maximum tensile strength of 230 MPa was achieved for 5-pass MDF-processed Mg-6%Zn alloy which is about ~ 2.0 times higher in comparison with that of homogenized alloy (117 MPa) and was attributed to higher dislocations density and grain refinement. Corrosion behavior of the alloy was investigated in 0.1 M NaCl solution using potentiodynamic polarization test, electrochemical impedance spectra analysis, and immersion tests. It was found that the corrosion rate of 5-pass MDF sample improved (0.34 mm/year) ~2.5 times in comparison with that of homogenized Mg-6%Zn alloy (0.86 mm/year) due to fine grain structure, which creates more grain boundaries that act as a corrosion barrier.

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Acknowledgments

The authors gratefully acknowledge Exclusive Magnesium Private Limited, Hyderabad, India, for their help with the processing of Mg-Zn alloy and gratefully appreciate Dr. Shashank Shekhar, Materials Science and Engineering, Indian Institute of Technology, Kanpur, for his support and interaction in extending electron backscattered diffraction (EBSD) facility.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, India

    S. Ramesh, H. Shivananda Nayaka & M. R. Ramesh

  2. Department of Mechanical Engineering, Shri Madhwa Vadiraja Institute of Technology and Management, Udupi, 574115, India

    Gajanan Anne

  3. Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India

    Sandeep Sahu

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  1. S. Ramesh
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Correspondence to Gajanan Anne.

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Ramesh, S., Anne, G., Nayaka, H.S. et al. Influence of Multidirectional Forging on Microstructural, Mechanical, and Corrosion Behavior of Mg-Zn Alloy. J. of Materi Eng and Perform 28, 2053–2062 (2019). https://doi.org/10.1007/s11665-019-04007-0

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  • DOI: https://doi.org/10.1007/s11665-019-04007-0

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