Effects of MgO modified β-TCP nanoparticles on the microstructure and properties of β-TCP/Mg-Zn-Zr composites

Abstract

The mechanical properties and corrosion resistance of magnesium alloy composites were improved by the addition of MgO surface modified tricalcium phosphate ceramic nanoparticles (m-β-TCP). Mg-3Zn-0.8Zr composites with unmodified (MZZT) and modified (MZZMT) nanoparticles were produced by high shear mixing technology. Effects of MgO m-β-TCP nanoparticles on the microstructure, mechanical properties, electrochemical corrosion properties and cytocompatibility of Mg-Zn-Zr/β-TCP composites were investigated. After hot extrusion deformation and dynamic recrystallization, the grain size of MZZMT was the half size of MZZT and the distribution of m-β-TCP particles in the matrix was more uniform than β-TCP particles. The yield tensile strength (YTS), ultimate tensile strength (UTS), and corrosion potential (Ecorr) of MZZMT were higher than MZZT; the corrosion current density (Icorr) of MZZMT was lower than MZZT. Cell proliferation of co-cultured MZZMT and MZZT composite samples were roughly the same and the cell number at each time point is higher for MZZMT than for MZZT samples.

Compositional Tailoring of Mg–2Zn–1Ca Alloy Using Manganese to Enhance Compression Response and In-Vitro Degradation

“…The corrosion process in biodegradable metals like Mg-based alloys includes electrochemical reactions where oxides, hydroxides, and H 2 gas is evolved [64]. The anodic and cathodic reduction reactions are given below:…”

Comprehensive review of additively manufactured biodegradable magnesium implants for repairing bone defects from biomechanical and biodegradable perspectives

“…The corrosion rate of Mg-based MMCs can be adjusted by selecting different reinforcing particles and their amounts. Several bioactive bioceramics, including Hydroxyapatite (HA) (Shuai et al, 2017a;Hiromoto et al, 2021), Tricalcium phosphate (TCP) (Zheng et al, 2017;Narita et al, 2019;Dang et al, 2020;Pan et al, 2020), and bioglass (BG) (Zhang et al, 2016;Duan et al, 2020;Singh et al, 2020), have been utilized as reinforcement particles in Mg-based MMCs. The addition of hydroxyapatite enhances the compressive properties of AM Mg.…”

“…Residual stresses are generated during the L-PBF process, where the parts are stacked layer-by-layer which continuously heats and cools the metal ( Shuai et al, 2017b ). Optimized heat treatment after AM can effectively reduce defects and residual thermal stresses, improve the microstructure of porous materials, and eventually enhance the biomechanical features of the lattice structures ( Zhang et al, 2018b ). The surface properties of the pillars that make up the lattice structure can also be further optimized by surface treatments, such as sandblasting and chemical etching, which allow for a smoother surface on the AM porous structure while removing unmelted powder particles.…”

Insight into the Role and Mechanism of Nano MgO on the Hot Compressive Deformation Behavior of Mg-Zn-Ca Alloys

“…Aiming to further improve the bioactivity and mechanical properties of Mg alloys [2], Mg-matrix composites (MMCs) have been studied in the last decade. These materials use micro or nano-sized ceramic particles as reinforcements, such as calcium phosphate particles (CPP) [3], hydroxyapatite (HA) [4], tricalcium phosphate (β-TCP) [5], ZrO 2 [6], Al 2 O 3 [7], ZnO [8] and TiB 2 [9], which improve the yield strength (YS) and utimate tensile strength (UTS) of Mg alloys. However, these enforcement particles have disadvantages of serious aggregation and nonuniform distribution, and a poor interface between the particles and magnesium matrix, leading to the deterioration in mechanical properties.…”

“…is more easily deformed than MZC under the same hot deformation condition. Substituting the above measured values into Equation (1), the constitutive equations for the MZC and MZCM are eventually obtained as Equations(5) and(6), respectively.…”