Enhancing the Mechanical Properties of Biodegradable Mg Alloys Processed by Warm HPT and Thermal Treatments

Andrea Mizelli-Ojdanic; Jelena Horky; Bernhard Mingler; Mattia Fanetti; Sandra Gardonio; Matjaz Valant; Bartosz Sulkowski; Erhard Schafler; Dmytro Orlov; Michael J. Zehetbauer

doi:10.3390/ma14216399

Enhancing the Mechanical Properties of Biodegradable Mg Alloys Processed by Warm HPT and Thermal Treatments

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

Materials Engineering

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	6399
Journal	Materials
Volume	14
Issue number	21
DOIs	https://doi.org/10.3390/ma14216399
Publication status	Published - 2021 Oct 25

Subject classification (UKÄ)

Metallurgy and Metallic Materials

Free keywords

Biodegradability
Magnesium alloys
Precipitates
Severe plastic deformation (SPD)
Vacancy agglomerates

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10.3390/ma14216399Licence: CC BY

Topologically designed magnesium alloys for biomedical applications
Orlov, D. (PI), Valant, M. (Researcher), Gardonio, S. (Researcher), Fanetti, M. (Researcher) & Zehetbauer, M. (CoI)
2017/03/01 → 2020/02/29
Project: Research

Cite this

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title = "Enhancing the Mechanical Properties of Biodegradable Mg Alloys Processed by Warm HPT and Thermal Treatments",

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.",

keywords = "Biodegradability, Magnesium alloys, Precipitates, Severe plastic deformation (SPD), Vacancy agglomerates",

author = "Andrea Mizelli-Ojdanic and Jelena Horky and Bernhard Mingler and Mattia Fanetti and Sandra Gardonio and Matjaz Valant and Bartosz Sulkowski and Erhard Schafler and Dmytro Orlov and Zehetbauer, {Michael J.}",

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T1 - Enhancing the Mechanical Properties of Biodegradable Mg Alloys Processed by Warm HPT and Thermal Treatments

AU - Mizelli-Ojdanic, Andrea

AU - Horky, Jelena

AU - Mingler, Bernhard

AU - Fanetti, Mattia

AU - Gardonio, Sandra

AU - Valant, Matjaz

AU - Sulkowski, Bartosz

AU - Schafler, Erhard

AU - Orlov, Dmytro

AU - Zehetbauer, Michael J.

PY - 2021/10/25

Y1 - 2021/10/25

N2 - 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.

AB - 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.

KW - Biodegradability

KW - Magnesium alloys

KW - Precipitates

KW - Severe plastic deformation (SPD)

KW - Vacancy agglomerates

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DO - 10.3390/ma14216399

M3 - Article

C2 - 34771925

AN - SCOPUS:85118185422

SN - 1996-1944

VL - 14

JO - Materials

JF - Materials

IS - 21

M1 - 6399

ER -

Enhancing the Mechanical Properties of Biodegradable Mg Alloys Processed by Warm HPT and Thermal Treatments

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Topologically designed magnesium alloys for biomedical applications

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