Work

Effect of Microstructure Refinement on the Corrosion Behavior of the Bioresorbable Mg-1Zn-0.2Ca and Mg-1Ca Alloys

Year: 2022

Type: article

Abstract: This paper presents a comprehensive study of the effect of the processing by high-pressure torsion (HPT) on the corrosion behavior in Ringer's solution for two popular bioresorbable magnesium alloys-Mg-1Ca and Mg-1Zn-0.2Ca. Three states were studied for each alloy-the initial homogenized state, the as-HPT-processed state and the state after subsequent annealing at 250 and 300 °C. It is shown that HPT processing results in a very strong grain refinement in both alloys down to a mean grain size of about 210 nm for the Mg-1Ca alloy and 90 nm for the Mg-1Zn-0.2Ca alloy, but their corrosion resistance values differ significantly (by an order of magnitude). The conducted precision scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction studies demonstrate that such a difference in the corrosion behavior is conditioned by a difference in the morphology and origin of the nano-sized particles of second phases, as well as by a change in the electrochemical properties of the "particle-α-Mg" pair. The obtained results are discussed from the perspective of the innovative applications of biodegradable Mg alloys for the manufacture of advanced medical implants and products.

Source: Materials

DOI: 10.3390/ma15196749

Authors: Olga B. Kulyasova, Ganjina D. Khudododova, Grigory S. Dyakonov, Yufeng Zheng, Ruslan Z. Valiev

Institutions: Bashkir State University, Ufa State Aviation Technical University, Peking University

Language: English

Topic: Magnesium Alloys: Properties and Applications

Subfield: Biomaterials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,408

Funder: Russian Science Foundation