Microstructural Assessment, Mechanical and Corrosion Properties of a Mg-Sr Alloy Processed by Combined Severe Plastic Deformation

Ruslan K Nafikov; Olga B Kulyasova; Ganjina D Khudododova; Nariman A Enikeev

doi:10.3390/ma16062279

Microstructural Assessment, Mechanical and Corrosion Properties of a Mg-Sr Alloy Processed by Combined Severe Plastic Deformation

Materials (Basel). 2023 Mar 12;16(6):2279. doi: 10.3390/ma16062279.

Authors

Ruslan K Nafikov^{1

2}, Olga B Kulyasova^{1

3}, Ganjina D Khudododova^{1

3}, Nariman A Enikeev^{2

4}

Affiliations

¹ Institute of Physics of Advanced Materials, Ufa University of Science and Technology, 32 Zaki Validi Str., 450076 Ufa, Russia.
² Laboratory of Metals and Alloys Under Extreme Impacts, Ufa University of Science and Technology, 32 Zaki Validi Str., 450076 Ufa, Russia.
³ Laboratory of Multifunctional Materials, Ufa University of Science and Technology, 32 Zaki Validi Str., 450076 Ufa, Russia.
⁴ Laboratory for Dynamics and Extreme Performance of Promising Nanostructured Materials, Saint Petersburg State University, 199034 St. Petersburg, Russia.

Abstract

The development of high-performance biodegradable alloys with controllable corrosion rates to be used for manufacturing advanced implants is a hot topic of modern materials science and biomedicine. This work features the changes in microstructure, corrosion behavior and mechanical properties of the Mg-2 wt.%Sr alloy progressively induced by equal-channel angular pressing, high-pressure torsion and annealing. We show that such processing leads to significant microstructure refinement including diminishing grain size, defect accumulation and fragmentation of the initial eutectics. We demonstrate that the application of severe plastic deformation and heat treatment is capable of considerably enhancing the mechanical and corrosion performance of a biodegradable alloy of the Mg-Sr system. The best trade-off between strength, plasticity and the corrosion resistance has been achieved by annealing of the Mg-Sr alloy subjected to combined severe plastic deformation processing.

Keywords: biodegradable magnesium alloy; corrosion; mechanical properties; microstructure; severe plastic deformation; ultrafine-grained materials.

Grants and funding

R.K.N. and N.A.E. acknowledge the support from the Youth Research Laboratory of Metals and Alloys under Extreme Impacts of the Eurasian Center of Excellence established in Ufa University of Science and Technology (state assignment No. 075-03-2022-318/1). K.O.B. was supported by the Russian Science Foundation, grant number 20-63-47027. The experimental part of the work was performed using the equipment of the “Nanotech” Center of Collective Use at Ufa University of Science and Technology.