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Journal of Materials Engineering and Performance

Erschienen in:

03.04.2019

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

verfasst von: S. Ramesh, Gajanan Anne, H. Shivananda Nayaka, Sandeep Sahu, M. R. Ramesh

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 4/2019

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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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Titel: Influence of Multidirectional Forging on Microstructural, Mechanical, and Corrosion Behavior of Mg-Zn Alloy
verfasst von: S. Ramesh
Gajanan Anne
H. Shivananda Nayaka
Sandeep Sahu
M. R. Ramesh
Publikationsdatum: 03.04.2019
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 4/2019
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-019-04007-0

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