Effect of high-pressure torsion on microstructure, mechanical properties and corrosion resistance of cast pure Mg.

Ahmadkhaniha, D., Huang, Y., Jaskari, M., Järvenpää, A., Sohi, M.H., Zanella, C., Karjalainen, L.P. and Langdon, T.G., 2018. Effect of high-pressure torsion on microstructure, mechanical properties and corrosion resistance of cast pure Mg. Journal of Materials Science. (In Press)

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DOI: 10.1007/s10853-018-2779-1

Abstract

© 2018, The Author(s). High-pressure torsion (HPT) processing was applied to cast pure magnesium, and the effects of the deformation on the microstructure, hardness, tensile properties and corrosion resistance were evaluated. The microstructures of the processed samples were examined by electron backscatter diffraction, and the mechanical properties were determined by Vickers hardness and tensile testing. The corrosion resistance was studied using electrochemical impedance spectroscopy in a 3.5% NaCl solution. The results show that HPT processing effectively refines the grain size of Mg from millimeters in the cast structure to a few micrometers after processing and also creates a basal texture on the surface. It was found that one or five turns of HPT produced no significant difference in the grain size of the processed Mg and the hardness was a maximum after one turn due to recovery in some grains. Measurements showed that the yield strength of the cast Mg increased by about seven times whereas the corrosion resistance was not significantly affected by the HPT processing.

Item Type:Article
ISSN:0022-2461
Additional Information:YH and TGL were supported in part by the European Research Council under Grant Agreement No. 267464-SPDMETALS.
Group:Faculty of Science & Technology
ID Code:31198
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:04 Sep 2018 09:08
Last Modified:04 Sep 2018 09:08

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