scholarly journals Biomedical Magnesium Alloys: A Review of Material Properties, Surface Modifications and Potential as a Biodegradable Orthopaedic Implant

2013 ◽  
Vol 2 (6) ◽  
pp. 218-240 ◽  
Author(s):  
Gérrard Eddy Jai Poinern ◽  
Sridevi Brundavanam ◽  
Derek Fawcett
Keyword(s):  
Magnesium Alloys ◽  
Material Properties ◽  
Surface Modifications ◽  
Orthopaedic Implant

Influence of Nanofillers on the Surface Electrical Discharge Resistance of Epoxy Insulation Used in HV Power Apparatus

2011 ◽  
Vol 12 (4) ◽  
Author(s):  
P. Preetha ◽  
M. Joy Thomas
Keyword(s):  
Surface Roughness ◽  
Material Properties ◽  
Electrical Discharge ◽  
Interparticle Distance ◽  
Surface Modifications ◽  
Filler Concentration ◽  
Dsc Analysis ◽  
Dispersion Method ◽  
Silica Nanocomposites ◽  
Roughness Measurements

Resistance to surface electrical discharge was investigated for epoxy alumina and epoxy silica nanocomposites. Epoxy alumina nanocomposites with 0.1, 1, 5, 10 and 15 wt% nanoalumina fillers as well as epoxy silica nanocomposites with 0.1, 1 and 5 wt% nanosilica fillers were prepared in the laboratory using direct dispersion method. Experiments were conducted at 10kV ac voltage for different durations using IEC (b) type electrodes. The degradation of the sample surfaces were analyzed using SEM techniques, surface roughness measurements and FTIR spectroscopy. The effect of interface on the material properties were investigated by DSC analysis. It was observed that the resistance to surface degradation improved for both epoxy alumina and epoxy silica nanocomposites as compared to the performance of unfilled epoxy. Also epoxy alumina nanocomposites showed better resistance to degradation as compared to epoxy silica nanocomposites for all the filler concentrations considered. The enhancement in degradation resistance for epoxy nanocomposites is attributed to the surface modifications of the nanocomposites when exposed to discharges and the nature of the interface in the region around the nanoparticles. The filler concentration and thereby the interparticle distance also has a significant effect on the discharge degradation resistance.

scholarly journals Corrosion Protection and Surface Treatment of Magnesium Alloys Used for Orthopedic Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Nabil Nassif ◽  
Ibrahim Ghayad
Keyword(s):  
Corrosion Resistance ◽  
Surface Treatment ◽  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Microarc Oxidation ◽  
Surface Modifications ◽  
Biodegradable Materials ◽  
Alloying Additions ◽  
History Of ◽  
Orthopedic Applications

An overview is reported about the history of prevailing magnesium alloys as orthopedic biodegradable materials. Important features of the effect of alloying additions, along with surface treatments for corrosion protection of magnesium alloys, are described. Hydroxyapatite (HA), the promising coat deposited by different direct and electrochemical methods to tailor corrosion resistance and biocompatibility, is discussed. Surface modifications, such as microarc oxidation or anodization which lead to nanostructures fabricated to provide better adhesion for HA coatings, are presented.

Surface Modifications of Magnesium Alloys for Biomedical Applications

2011 ◽  
Vol 39 (7) ◽  
pp. 1857-1871 ◽  
Author(s):  
Jingxin Yang ◽  
Fuzhai Cui ◽  
In Seop. Lee
Keyword(s):  
Magnesium Alloys ◽  
Biomedical Applications ◽  
Surface Modifications

scholarly journals Nanoscale Surface Modifications of Orthopaedic Implants: State of the Art and Perspectives

2016 ◽  
Vol 10 (1) ◽  
pp. 920-938 ◽  
Author(s):  
RMT Staruch ◽  
MF Griffin ◽  
PEM Butler
Keyword(s):  
Surface Modification ◽  
Surface Modifications ◽  
Orthopaedic Implant ◽  
Success Rates ◽  
Orthopaedic Implants ◽  
Future Directions ◽  
Surgical Interventions ◽  
Surface Control ◽  
Total Knee

Background:Orthopaedic implants such as the total hip or total knee replacement are examples of surgical interventions with postoperative success rates of over 90% at 10 years. Implant failure is associated with wear particles and pain that requires surgical revision. Improving the implant - bone surface interface is a key area for biomaterial research for future clinical applications. Current implants utilise mechanical, chemical or physical methods for surface modification.Methods:A review of all literature concerning the nanoscale surface modification of orthopaedic implant technology was conducted.Results:The techniques and fabrication methods of nanoscale surface modifications are discussed in detail, including benefits and potential pitfalls. Future directions for nanoscale surface technology are explored.Conclusion:Future understanding of the role of mechanical cues and protein adsorption will enable greater flexibility in surface control. The aim of this review is to investigate and summarise the current concepts and future directions for controlling the implant nanosurface to improve interactions.

scholarly journals Mg-Alloys for Forging Applications—A Review

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 985 ◽  
Author(s):  
Nikolaus P. Papenberg ◽  
Stefan Gneiger ◽  
Irmgard Weißensteiner ◽  
Peter J. Uggowitzer ◽  
Stefan Pogatscher
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Magnesium Alloys ◽  
Material Properties ◽  
Industrial Production ◽  
Processing Parameters ◽  
Practical Realization ◽  
General Introduction ◽  
Promising Candidate

Interest in magnesium alloys and their applications has risen in recent years. This trend is mainly evident in casting applications, but wrought alloys are also increasingly coming into focus. Among the most common forming processes, forging is a promising candidate for the industrial production of magnesium wrought products. This review is intended to give a general introduction into the forging of magnesium alloys and to help in the practical realization of forged products. The basics of magnesium forging practice are described and possible problems as well as material properties are discussed. Several alloy systems containing aluminum, zinc or rare earth elements as well as biodegradable alloys are evaluated. Overall, the focus of the review is on the process control and processing parameters, from stock material to finished parts. A discussion of the mechanical properties is included. These data have been comprehensively reviewed and are listed for a variety of magnesium forging alloys.

scholarly journals Effect of ECAE Die Angle on Microstructure Mechanical Properties and Corrosion Behavior of AZ80/91 Magnesium Alloys

2020 ◽  
Author(s):  
Gajanan Manjunath Naik ◽  
Sachin Bandadka ◽  
Manjaiah Mallaiah ◽  
Ravindra Ishwar Badiger ◽  
Narendranath Sannayellappa
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Magnesium Alloys ◽  
Material Properties ◽  
Mg Alloys ◽  
Processing Temperature ◽  
Channel Angle ◽  
Angular Pressing ◽  
Mechanical Properties And Corrosion

Magnesium alloys have poor tensile strength, ductility and corrosion resistance properties associated with other engineering materials like aluminum alloys, steels and superalloys etc. Therefore, many researchers worked on equal channel angular pressing of magnesium alloys to improve the mechanical properties and corrosion resistance. In this work, the effect of channel angles on material properties was investigated during equal channel angular pressing of AZ80/91 magnesium alloy using processing route-R at 598 K processing temperature. Channel angles of 900 and 1100, common corner angle of 300 have been considered for the study. It has been revealed that the channel angle has a significant influence on deformation homogeneity, microhardness, ultimate tensile strength, ductility, and corrosion behavior of AZ80/91 magnesium alloys. Specifically, AZ80/91 Mg alloys processed through 900 channel angle i.e. die A is considered as optimal die parameter to improve above-said material properties. Investigation showing concerning as-received AZ80 and AZ91 Mg alloy indicates 11%, 14% improvement of UTS and 69%, 59% enhancement in ductility after processing through 4P through die A (90°) at 598 K respectively. Also, the corrosion rate reduces to 97% and 99% after processing the sample with 4P-ECAP die A (90°) at the same processing temperature for AZ80 and AZ91 Mg alloys respectively. This is mainly due to grain refinement and distribution of Mg17Al12 secondary phase during ECAP.

Evaluating Material Property Variations in Components With Difficult Geometries

2017 ◽  
Author(s):  
Tarak Amine ◽  
Joseph W. Newkirk ◽  
Ronald J. O’Malley
Keyword(s):  
Quality Control ◽  
Powder Metallurgy ◽  
Material Properties ◽  
Control Process ◽  
Surface Modifications ◽  
Laser Melting ◽  
New Information ◽  
Quality Control Process ◽  
Manufacturing Methods ◽  
Inhomogeneous Properties

All manufacturing methods produce components which have some degree of inhomogeneous properties. Part properties may vary with location in most fabrication methods including additive manufacturing, casting, forging, welding, and surface modifications. Standard tensile test specimens cannot provide a good map of the properties of the material, except for only the largest of components or simplest of geometries. For example, simple curved shapes, such as pipes cannot be reliably evaluated by straight tensile specimens unless the pipe diameter is large enough to have a sufficiently low curvature from which flat specimens can be machined. This paper will look at part property variations in various components made by different fabrication methods, which include selective laser melting, press and sinter powder metallurgy, rolling and casting. Subsize tensile specimens developed at the Missouri University of Science and Technology have been used to map out material properties with location. This method of mapping out properties provides new information which could be valuable to quality control, process control, and design of components.

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