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Effect of Zn content and processing route on the microstructure, mechanical properties, and bio-degradation of Mg-Zn alloys
, Article Journal of Materials Research and Technology ; Volume 21 , 2022 , Pages 4473-4489 ; 22387854 (ISSN) ; Gerashi, E ; Alizadeh, R ; Mahmudi, R ; Sharif University of Technology
Elsevier Editora Ltda
2022
Abstract
The effects of zinc content (2 and 4 wt%), heat treatment (solution-Treated and T6), as well as hot deformation (extrusion and multi-directional forging (MDF)) on the microstructure, mechanical and degradation behavior of Mg-Zn alloys were studied. As the result of microstructure refinement, solid solution and precipitate strengthening (formation of MgZn second phases), the strength of pure Mg was increased after Zn addition. Solution treatment of the Mg-4Zn alloy resulted in 16% softening due to the dissolution of the MgZn second phases and also grain growth, while aging treatment increased the strength value by 8% in comparison to the as-cast material because of the formation of the fine...
Effects of heat treatment on the corrosion behavior and mechanical properties of biodegradable Mg alloys
, Article Journal of Magnesium and Alloys ; Volume 10, Issue 7 , 2022 , Pages 1737-1785 ; 22139567 (ISSN) ; Alizadeh, R ; Gerashi, E ; Asadollahi, M ; Langdon, T. G ; Sharif University of Technology
National Engg. Reaserch Center for Magnesium Alloys
2022
Abstract
Biodegradable magnesium (Mg) alloys exhibit great potential for use as temporary structures in tissue engineering applications. Such degradable implants require no secondary surgery for their removal. In addition, their comparable mechanical properties with the human bone, together with excellent biocompatibility, make them a suitable candidate for fracture treatments. Nevertheless, some challenges remain. Fast degradation of the Mg-based alloys in physiological environments leads to a loss of the mechanical support that is needed for complete tissue healing and also to the accumulation of hydrogen gas bubbles at the interface of the implant and tissue. Among different methods used to...
Improving mechanical properties and biocompatibility of 3D printed PLA by the addition of PEG and titanium particles, using a novel incorporation method
, Article Bioprinting ; Volume 27 , 2022 ; 24058866 (ISSN) ; Gerashi, E ; Zohrevand, M ; Zarei, M ; Sayedain, S. S ; Alizadeh, R ; Labbaf, S ; Atari, M ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Polylactic acid (PLA) scaffolds produced by the fused deposition modeling (FDM) method have biocompatibility, close Young's modulus to that of bone, and the ability to make complex shapes. However, PLA has some drawbacks like brittleness, inappropriate mechanical strength and hydrophobicity, and a low degradation rate. In this study, polyethylene glycol (PEG) (5 and 10 wt%) by solving method and titanium (Ti) particles (5 wt%) by two different methods were mixed with PLA to address the mentioned problems. Extruded filaments were investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and fourier transform infrared (FTIR). Surface morphology of the produced filaments...