scholarly journals Enhancing the Mechanical Properties of Biodegradable Mg Alloys Processed by Warm HPT and Thermal Treatments

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6399
Author(s):  
Andrea Mizelli-Ojdanic ◽  
Jelena Horky ◽  
Bernhard Mingler ◽  
Mattia Fanetti ◽  
Sandra Gardonio ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermomechanical Processing ◽  
High Pressure Torsion ◽  
Heat Treatments ◽  
Mg Alloys ◽  
Processing Route ◽  
Corrosion Properties ◽  
Biodegradable Implant ◽  
Significant Strength ◽  
Low Temperature Processing

In this study, several biodegradable Mg alloys (Mg5Zn, Mg5Zn0.3Ca, Mg5Zn0.15Ca, and Mg5Zn0.15Ca0.15Zr, numbers in wt%) were investigated after thermomechanical processing via high-pressure torsion (HPT) at elevated temperature as well as after additional heat treatments. Indirect and direct analyses of microstructure revealed that the significant strength increases arise not only from dislocations and precipitates but also from vacancy agglomerates. By contrast with former low-temperature processing routes applied by the authors, a significant ductility was obtained because of temperature-induced dynamic recovery. The low initial values of Young’s modulus were not significantly affected by warm HPT-processing. nor by heat treatments afterwards. Also, corrosion resistance did not change or even increase during those treatments. Altogether, the study reveals a viable processing route for the optimization of Mg alloys to provide enhanced mechanical properties while leaving the corrosion properties unaffected, suggesting it for the use as biodegradable implant material.

scholarly journals Powder Metallurgical Synthesis of Biodegradable Mg-Hydroxyapatite Composites for Biomedical Applications

2015 ◽  
Vol 828-829 ◽  
pp. 165-171 ◽  
Author(s):  
César Augusto Stüpp ◽  
Chamini Lakshi Mendis ◽  
Marta Mohedano ◽  
Gábor Szakács ◽  
Felix Gensch ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ball Milling ◽  
Base Material ◽  
Hot Extrusion ◽  
High Energy ◽  
Mg Alloys ◽  
Processing Route ◽  
Compressive Yield Strength ◽  
Compression Tests ◽  
Corrosion Properties

Biodegradable Mg alloys are a new class of temporary implant materials for musculo-skeletal surgery. Recent studies show that Mg-based alloys can be biocompatible and there is a high demand to design Mg alloys with adjustable corrosion rates and suitable mechanical properties. An approach to solving this challenge might be the use of Mg metal matrix composites (Mg-MMC). In this study, a Mg-MMC composed of ZK60 was investigated as the base material and hydroxyapatite (HA) particles were added for tailoring its properties. The composite was produced by high-energy ball milling followed by hot extrusion. This processing route was chosen, as HA in contact with molten Mg releases a toxic gas (phosphine – PH3). The HA particles were homogeneously distributed in the ZK60 matrix after ball milling and the composite was consolidated by hot extrusion. This work presents the influence of different amounts of HA on corrosion behavior and mechanical properties of the composite. Corrosion properties were evaluated by immersion and electrochemical measurements in physiological media at 37 °C. A slight improvement in the corrosion resistance was observed for Mg-MMC due to the presence of more stable corrosion products. Compression tests were used to measure the mechanical properties. Under compression, samples showed a slight increase in the compressive yield strength with the addition of HA, while the ultimate strength did not change significantly.

Effect of High Strain-Rate Thermomechanical Processing on Microstructure and Mechanical Properties of Ti-10V-2Fe-3Al Alloy

2013 ◽  
Vol 845 ◽  
pp. 96-100 ◽  
Author(s):  
Piotr Skubisz ◽  
Marek Packo ◽  
Katarzyna Mordalska ◽  
Tadeusz Skowronek
Keyword(s):  
Mechanical Properties ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Thermomechanical Processing ◽  
Hot Forging ◽  
High Strength ◽  
Processing Route ◽  
Microstructure And Mechanical Properties ◽  
Processed Material

Results of beta forging of titanium alloy Ti-10V-2Fe-3Al and subsequent thermal treatment are presented, with analysis of the effect of the processing route on the final mechanical properties, correlated with microstructure of thermomechanically processed material. Investigation of response to high strain-rate hot-forging of microstructure and mechanical properties is focused on the effect of the strengthening mechanisms in the material after two common manners of deformation typical of that alloy. The effect of deformation conditions on final microstructure and mechanical properties was analyzed in three crucial stages of thermomechanical processing, e.i. after deformation, quenching and aging. In result, conclusions were formulated as for processing conditions promoting high strength and/or ductility.

scholarly journals Effect of Heat Treatment on the Mechanical and Corrosion Properties of Mg–Zn–Ga Biodegradable Mg Alloys

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7847
Author(s):  
Viacheslav Bazhenov ◽  
Anastasia Lyskovich ◽  
Anna Li ◽  
Vasily Bautin ◽  
Alexander Komissarov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Corrosion Rate ◽  
Orthopedic Implants ◽  
Mg Alloys ◽  
Medical Implants ◽  
Corrosion Properties ◽  
Treatment Regimens ◽  
Mechanical And Corrosion Properties ◽  
Potential Use

Mg alloys have mechanical properties similar to those of human bones, and have been studied extensively because of their potential use in biodegradable medical implants. In this study, the influence of different heat treatment regimens on the microstructure and mechanical and corrosion properties of biodegradable Mg–Zn–Ga alloys was investigated, because Ga is effective in the treatment of disorders associated with accelerated bone loss. Solid–solution heat treatment (SSHT) enhanced the mechanical properties of these alloys, and a low corrosion rate in Hanks’ solution was achieved because of the decrease in the cathodic-phase content after SSHT. Thus, the Mg–4 wt.% Zn–4 wt.% Ga–0.5 wt.% Y alloy after 18 h of SSHT at 350 °C (ultimate tensile strength: 207 MPa; yield strength: 97 MPa; elongation at fracture: 7.5%; corrosion rate: 0.27 mm/year) was recommended for low-loaded orthopedic implants.

scholarly journals Alloying Elements of Magnesium Alloys: A Literature Review

2021 ◽  
Author(s):  
Nouha Loukil
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Magnesium Alloys ◽  
Clinical Applications ◽  
Mg Alloys ◽  
Alloying Elements ◽  
Strengthening Mechanisms ◽  
Corrosion Properties ◽  
Lightweight Structures ◽  
Re Elements

Magnesium alloys are the lightest structural metal. The lightness is the main reason for the interest for Mg in various industrial and clinical applications, in which lightweight structures are in high demand. Recent research and developments on magnesium Mg alloys are reviewed. A particular attention is focused on binary and ternary Mg alloys consisting mainly of Al, Zn, Mn, Ca and rare earth (RE) elements. The effects of different alloying elements on the microstructure, the mechanical and the corrosion properties of Mg alloys are described. Alloying induces modifications of the microstructural characteristics leading to strengthening mechanisms, improving then the ductility and the mechanical properties of pure Mg.

scholarly journals Effect of Mg on microstructure and mechanical properties of Al-Mg alloys produced by high pressure torsion

2019 ◽  
Vol 159 ◽  
pp. 137-141 ◽  
Author(s):  
Yang Liu ◽  
Manping Liu ◽  
Xuefei Chen ◽  
Yang Cao ◽  
Hans J. Roven ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
High Pressure Torsion ◽  
Mg Alloys ◽  
Microstructure And Mechanical Properties ◽  
Al Mg Alloys

Mechanical Characteristics of an Anodized Magnesium Alloy for Biodegradable Implants

2013 ◽  
Author(s):  
Leon White ◽  
Sudheer Neralla ◽  
Ruben Kotoka ◽  
Yongseok Jang ◽  
Yeoheung Yun ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Electrolyte Solution ◽  
Protective Coatings ◽  
Microstructural Characterization ◽  
Mg Alloys ◽  
Biodegradable Implants ◽  
Treatment Technique ◽  
Corrosion Properties ◽  
Biodegradable Implant ◽  
Beneficial Effects

In recent years, magnesium (Mg) alloys have emerged as possible biodegradable implant materials; however the degradation rate of Mg occurs at a higher rate than tolerable for the human body. Plasma electrolytic oxidation (PEO) has been used in the past as a useful surface treatment technique to improve the anti-corrosion properties of Mg alloys by forming protective coatings. This present work focuses on the effect of electrolyte solution on the corrosion, microstructural, and nanomechanical behavior of PEO coatings for possible use in biodegradable implants. The experimental parameters applied during PEO process did influence the structure, thickness, and morphology of the coating. Microstructural characterization of the coating was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM) followed by image analysis and energy dispersive spectroscopy (EDX). Further, nanoindentation was employed to evaluate nanohardness and Young’s modulus of the PEO coating. The results show beneficial effects of the PEO coating to enhance the corrosion resistance of the uncoated AZ31 magnesium alloy. The XRD pattern shows that the components of the film vary based on electrolyte solution. The film composition does affect the nanomechanical behavior.

Development of Degradable Mg-RE Based Biomaterials

2012 ◽  
Vol 509 ◽  
pp. 36-39 ◽  
Author(s):  
Qiu Ming Peng ◽  
Han Wu Dong ◽  
Yong Jun Tian ◽  
Hong Jie Zhang
Keyword(s):  
Mechanical Properties ◽  
Cold Drawing ◽  
Mg Alloys ◽  
Corrosion Properties ◽  
Automotive Components ◽  
Second Surgery ◽  
Mechanical And Corrosion Properties

Mg alloys were increasingly attracting attention as a potential implant biomaterials because that there will be no need for a second surgery. However, the majority of conventional Mg alloys have been developed for automotive components and were not suitable for Mg based implants. In this paper, a new Mg-RE based materials was developed for implant biomaterials, avoiding the negative influences of previous systems. Microstructure, mechanical and corrosion properties were investigated. The result exhibited that the mechanical properties and degradable rate were sufficient to satisfy the requirement of Mg-based implants. Furthermore, the deformability of the alloy was also investigated. The fine stent pipe was prepared by cold-drawing technology. The primitive results demonstrated that this new alloy was an ideal stent materials.

Effect of Severe Plastic Deformation on the Mechanical Behavior of Ti-6Al-4V

2003 ◽  
Author(s):  
Ibrahim Karaman ◽  
G. Guven Yapici
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Strain Hardening ◽  
Room Temperature ◽  
Equal Channel Angular Extrusion ◽  
Thermomechanical Processing ◽  
Processing Route ◽  
Plate Size ◽  
Different Temperatures ◽  
Tension And Compression

The present work focuses on the microstructural evolution and resulting room temperature mechanical properties of P/M Ti-6Al-4V severely deformed at different temperatures (550°C to 800°C) using Equal Channel Angular Extrusion (ECAE). The bulk materials are extruded through two channels of equal cross section intersecting an angle of 90 degree. Microstructure and mechanical properties of extruded billets are reported through electron microsopy observations and tension, compression and hardness experiments. Results are compared for different extrusion conditions including variations in temperature and processing route. Higher hardness values are obtained after ECAE compared to as-received values. These improvements are correlated with the grain refinement, phase refinement and texture produced during ECAE. The most favorable microstructure in terms of refined grains was two passes at 600°C. The ultimate goal is to develop ECAE thermomechanical-processing maps for the selection of processing schedules to obtain desired end microstructures and improved fatigue life in Ti-Al-V based materials. The investigations revealed that: 1. ECAE shear deformation leads to refinement in β plates and elimination of piror β boundaries. Decreasing extrusion temperature and increasing number of passes decreases α plate size and grain size. Refined α grain size leads to a significant increase in tensile and compressive flow stresses at room temperature. 2. The second extrusion pass at 800°C increased both the yield strength and ductility. This was attributed to the observed α plate refinement. 3. Cavitation at the interface between β strips and α plates at 550°C was thought to be the reason for low ductility and relatively low strain hardening at room temperature. 4. Texture has a pronounced effect on mechanical properties. Tension/compression asymmetry in flow strengths and strain hardening coefficients may be described by the activation of differing slip systems under tension and compression loading because of texture.

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