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Effect of high-pressure torsion on microstructure, mechanical properties and corrosion resistance of cast pure Mg
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
Materials Research Group, Department of Mechanical Engineering, University of Southampton, Southampton, United Kingdom.
Kerttu Saalasti Institute, University of Oulu, Nivala, Finland.
Kerttu Saalasti Institute, University of Oulu, Nivala, Finland.
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2018 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 53, no 24, p. 16585-16597Article in journal (Refereed) Published
Abstract [en]

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. 

Place, publisher, year, edition, pages
Springer, 2018. Vol. 53, no 24, p. 16585-16597
Keywords [en]
Corrosion resistance, Electrochemical impedance spectroscopy, Grain size and shape, High pressure effects, Mechanical properties, Microstructure, Sodium chloride, Tensile testing, Torsional stress, Vickers hardness, Vickers hardness testing, 3.5% nacl solutions, Basal textures, Cast structures, Effect of high pressure, Electron back scatter diffraction, Grain size, High pressure torsions, Pure magnesium, Electrochemical corrosion
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-41252DOI: 10.1007/s10853-018-2779-1ISI: 000445912300033PubMedID: 30393393Scopus ID: 2-s2.0-85051418547Local ID: JTHMaterialISOAI: oai:DiVA.org:hj-41252DiVA, id: diva2:1242033
Available from: 2018-08-27 Created: 2018-08-27 Last updated: 2019-02-18Bibliographically approved

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