Enhancing the mechanical properties of biodegradable mg alloys processed by warm HPT and thermal treatments

Author(s)
Andrea Mizelli-Ojdanic, Jelena Horky, Bernhard Mingler, Mattia Fanetti, Sandra Gardonio, Matjaz Valant, Bartosz Sulkowski, Erhard Schafler, Dmytro Orlov, Michael J. Zehetbauer
Abstract

In this study, several biodegradable Mg alloys (Mg5Zn, Mg5Zn0.3Ca, Mg5Zn0.15Ca, and Mg5Zn0.15Ca0.15Zr, numbers in wt%) were investigated after thermomechanical processing via high-pressure torsion (HPT) at elevated temperature as well as after additional heat treatments. Indirect and direct analyses of microstructure revealed that the significant strength increases arise not only from dislocations and precipitates but also from vacancy agglomerates. By contrast with former low-temperature processing routes applied by the authors, a significant ductility was obtained because of temperature-induced dynamic recovery. The low initial values of Young’s modulus were not significantly affected by warm HPT-processing. nor by heat treatments afterwards. Also, corrosion resistance did not change or even increase during those treatments. Altogether, the study reveals a viable processing route for the optimization of Mg alloys to provide enhanced mechanical properties while leaving the corrosion properties unaffected, suggesting it for the use as biodegradable implant material.

Organisation(s)
Physics of Nanostructured Materials, Dynamics of Condensed Systems
External organisation(s)
Center for Health and Bioresources, Austrian Institute of Technology (AIT), University of Nova Gorica, AGH University of Science and Technology, Lund University, Fachhochschule Technikum Wien
Journal
Materials
Volume
14
No. of pages
19
ISSN
1996-1944
DOI
https://doi.org/10.3390/ma14216399
Publication date
11-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Keywords
ASJC Scopus subject areas
Materials Science(all), Condensed Matter Physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/enhancing-the-mechanical-properties-of-biodegradable-mg-alloys-processed-by-warm-hpt-and-thermal-treatments(ff3c0de8-2267-4dbd-b641-a5d5c1599f2b).html