Bio-corrosion impacts on mechanical integrity of ZM21 Mg for orthopaedic implant application processed by equal channel angular pressing
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
Springer
Abstract
The mechanical integrity of rolled ZM21 Mg was improved by equal channel angular pressing (ECAP) to function as a potential biodegradable bone screw implant. Electron backscattered diffraction (EBSD) revealed deformed grains of 45 µm observed in rolled ZM21 Mg. They were transformed to equiaxed fine grains of 5.4 µm after 4th pass ECAP. The yield strength of rolled and ECAPed ZM21 Mg alloys were comparable. In contrast, 4th pass ZM21 Mg exhibited relatively higher elongation when compared to rolled sample. The mechanical properties of rolled and ECAPed ZM21 Mg were dependant on both grain refinement and crystallographic texture. The rolled and 4th pass ECAPed tensile samples exhibited nonlinear deterioration of mechanical properties when tested after 7, 14, 21 and 28 days immersion in Hank’s solution. The evaluation signifies that regardless their processing condition, ZM21 Mg alloys are suitable for surgical areas that requires high mechanical strength. In addition, the 4th pass ECAP samples were viable to MG-63 cells proving themselves to be promising candidates for future in vivo studies. [Figure not available: see fulltext.] © 2021, The Author(s).
Description
Keywords
Deterioration, Grain refinement, Grain size and shape, Magnesium alloys, Mechanical properties, Microbial corrosion, Pressing (forming), Textures, Crystallographic textures, Deformed grains, Electron back-scattered diffraction, Fine grains, High mechanical strength, Mechanical integrity, Orthopaedic implants, Processing condition, Equal channel angular pressing, alloy, magnesium, tetrazolium, thiazole derivative, thiazolyl blue, Article, biomechanics, cell viability, controlled study, corrosion, crystallography, human, human cell, immersion, in vitro study, MG-63 cell line, particle size, tensile strength, biodegradable implant, bone prosthesis, cell survival, chemistry, materials testing, mechanical stress, orthopedics, procedures, prostheses and orthoses, prosthesis design, radiation scattering, tumor cell line, Absorbable Implants, Alloys, Bone Substitutes, Cell Line, Tumor, Cell Survival, Corrosion, Humans, Magnesium, Materials Testing, Orthopedics, Prostheses and Implants, Prosthesis Design, Scattering, Radiation, Stress, Mechanical, Tensile Strength, Tetrazolium Salts, Thiazoles
Citation
Journal of Materials Science: Materials in Medicine, 2021, 32, 6, pp. -