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Volume 10
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10.3390/met10081064
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Article

The Effects of Severe Plastic Deformation and/or Thermal Treatment on the Mechanical Properties of Biodegradable Mg-Alloys

by
Andrea Ojdanic
1,2,
Jelena Horky
3,
Bernhard Mingler
3,
Mattia Fanetti
4,
Sandra Gardonio
4,
Matjaz Valant
4,5,
Bartosz Sulkowski
6,
Erhard Schafler
1,
Dmytro Orlov
4,7 and
Michael J. Zehetbauer
1,*
1
Physics of Nanostructured Materials, Faculty of Physics, University of Vienna, 1090 Wien, Austria
2
Faculty of Industrial Engineering, University of Applied Sciences–Technikum Wien, 1200 Wien, Austria
3
Center for Health & Bioresources, Biomedical Systems, AIT Austrian Institute of Technology GmbH, 2700 Wiener Neustadt, Austria
4
Materials Research Laboratory, University of Nova Gorica, SI-5270 Ajdovscina, Slovenia
5
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
6
Department of Material Science and Non-Ferrous Metals Engineering, Faculty of Non-Ferrous Metals, AGH-University of Science and Technology, 30-059 Kraków, Poland
7
Division of Materials Engineering, Department Mechanical Engineering, LTH, Lund University, 223-65 Lund, Sweden
*
Author to whom correspondence should be addressed.
Metals 2020, 10(8), 1064; https://doi.org/10.3390/met10081064
Submission received: 22 June 2020 / Revised: 29 July 2020 / Accepted: 1 August 2020 / Published: 6 August 2020
(This article belongs to the Special Issue Severe Plastic Deformation and Thermomechanical Processing: Nanostructuring and Properties)
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Abstract

In this study, five MgZnCa alloys with low alloy content and high biocorrosion resistance were investigated during thermomechanical processing. As documented by microhardness and tensile tests, high pressure torsion (HPT)-processing and subsequent heat treatments led to strength increases of up to 250%; as much as about 1/3 of this increase was due to the heat treatment. Microstructural analyses by electron microscopy revealed a significant density of precipitates, but estimates of the Orowan strength exhibited values much smaller than the strength increases observed. Calculations using Kirchner’s model of vacancy hardening, however, showed that vacancy concentrations of 10−⁵ could have accounted for the extensive hardening observed, at least when they formed vacancy agglomerates with sizes around 50–100 nm. While such an effect has been suggested for a selected Mg-alloy already in a previous paper of the authors, in this study the effect was substantiated by combined quantitative evaluations from differential scanning calorimetry and X-ray line profile analysis. Those exhibited vacancy concentrations of up to about 10−3 with a marked percentage being part of vacancy agglomerates, which has been confirmed by evaluations of defect specific activation migration enthalpies. The variations of Young’s modulus during HPT-processing and during the subsequent thermal treatments were small. Additionally, the corrosion rate did not markedly change compared to that of the homogenized state.
Keywords: Mg alloy; severe plastic deformation (SPD); intermetallic precipitates; vacancy agglomerates; corrosion Mg alloy; severe plastic deformation (SPD); intermetallic precipitates; vacancy agglomerates; corrosion

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MDPI and ACS Style

Ojdanic, A.; Horky, J.; Mingler, B.; Fanetti, M.; Gardonio, S.; Valant, M.; Sulkowski, B.; Schafler, E.; Orlov, D.; J. Zehetbauer, M. The Effects of Severe Plastic Deformation and/or Thermal Treatment on the Mechanical Properties of Biodegradable Mg-Alloys. Metals 2020, 10, 1064. https://doi.org/10.3390/met10081064

AMA Style

Ojdanic A, Horky J, Mingler B, Fanetti M, Gardonio S, Valant M, Sulkowski B, Schafler E, Orlov D, J. Zehetbauer M. The Effects of Severe Plastic Deformation and/or Thermal Treatment on the Mechanical Properties of Biodegradable Mg-Alloys. Metals. 2020; 10(8):1064. https://doi.org/10.3390/met10081064

Chicago/Turabian Style

Ojdanic, Andrea, Jelena Horky, Bernhard Mingler, Mattia Fanetti, Sandra Gardonio, Matjaz Valant, Bartosz Sulkowski, Erhard Schafler, Dmytro Orlov, and Michael J. Zehetbauer. 2020. "The Effects of Severe Plastic Deformation and/or Thermal Treatment on the Mechanical Properties of Biodegradable Mg-Alloys" Metals 10, no. 8: 1064. https://doi.org/10.3390/met10081064

APA Style

Ojdanic, A., Horky, J., Mingler, B., Fanetti, M., Gardonio, S., Valant, M., Sulkowski, B., Schafler, E., Orlov, D., & J. Zehetbauer, M. (2020). The Effects of Severe Plastic Deformation and/or Thermal Treatment on the Mechanical Properties of Biodegradable Mg-Alloys. Metals, 10(8), 1064. https://doi.org/10.3390/met10081064

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