Role of biomineralization on the degradation of fine grained AZ31 magnesium alloy processed by groove pressing

Sunil, B. Ratna; Kumar, Arun; Kumar, T.S. Sampath; Chakkingal, Uday

doi:10.1016/j.msec.2012.12.095

Cited by 85 publications

(49 citation statements)

References 41 publications

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“…In addition, Mg is essential to human metabolism and the fourth most abundant cation in the human body. The most important feature of Mg alloys for biomaterial science is their biodegradable property [7]. Magnesium can gradually be dissolved in the human body after implantation, the releasing of Mg + can be involved in metabolic reactions and biological mechanisms, and the soluble Mg oxide, which forms during corrosion, can be excreted by urine [8].…”

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confidence: 99%

“…Table 1.1 shows the mechanical properties, comparing Mg with different metallic biomaterials and human bone. Because of its excellent mechanical properties, use of Mg implant will greatly reduce stress shielding of the bone and the associated loss of bone density [7]. In addition, since implants, that are metallic, not Mg, are considered as a foreign organ to the human body, the long-term implantation of non-Mg materials cause local inflammation discomfort.…”

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confidence: 99%

“…[7,9]. The rapid corrosion causes lower cell activity and lower attachment due to the localized hydrogen gas produced during corrosion (8).…”

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Laser surface modification of AZ31B Mg alloy for bio-wettability

Vora

Dahotre

2014

J Biomater Appl

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Laser surface modification of AZ31B Magnesium alloy changes surface composition and roughness to provide improved surface bio-wettability. Laser processing resulted in phase transformation and grain refinement due to rapid quenching effect. Furthermore, instantaneous heating and vaporization resulted in removal of material, leading the textured surface generation. A study was conducted on a continuum-wave diode-pumped ytterbium laser to create multiple tracks for determining the resulting bio-wettability. Five different laser input powers were processed on Mg alloy, and then examined by XRD, SEM, optical profilometer, and contact angle measurement. A finite element based heat transfer model was developed using COMSOL multi-physics package to predict the temperature evolution during laser processing. The thermal histories predicted by the model are used to evaluate the cooling rates and solidification rate and the associated changes in the microstructure. The surface energy of laser surface modification samples can be calculated by measuring the contact angle Santhanakrishnan, whose work demonstrated to me that how to concern the matters of research and always inspirited me to pursue to an advanced quality in experimentation and research. Comparing to the conventional metallic biomaterials such as Ti-6Al-4V, stainless steel, and Co-Cr based materials, using Mg implants can provide several benefits which other metallic implants lack. Hence high biocompatibility and the ability to degrade after bone regrowth are the significant reasons to develop Mg implants. (4) capillary rise, and (5) tilted drop. Static, or sessile drop method is the most commonly used technique, because it is easy to conduct. In this case, a droplet is placed on the testing surface by using a contact angle goniometer. The contact angle is defined as an angle formed between the solid-liquid interface and the liquid-vapor interface and which has its vertex where the three interfaces meet as shown in Fig 1.1(a). Young's equation shows the relation of interfacial tensions of solid-vapor (γ sv ), liquid-vapor (γ lv ), solid-liquid (γ sl ), and contact angle (θ) as follows:If the contact angle is greater than 90°, the surface can be considered as a hydrophobic surface (Fig 1.1(b)). On the contrary, the small contact angle on the testing surface refers to the wetting or hydrophilic surface (Fig 1.1(c)). Although it has been broadly accepted that the biological response of the surface can be influenced by hydrophobicity/hydrophilicity, the wetting effects to cell behavior are still in controversy and inconsistency. Many researchers described that it is necessary to improve surface from hydrophobicity to hydrophilicity for supporting cell adherence and, in particular, growth. On the contrary, other researchers presented that the hydrophobic surface performed better cell response [13]. However, it is now well accepted in biomaterial community both overly hydrophobic and overly hydrophilic surface are not ideal for cell attachment, rather, surfaces wi...

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Laser surface modification of AZ31B Mg alloy for bio-wettability

Vora

Dahotre

2014

J Biomater Appl

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“…in electrotechnics [4], automotive [5], aircraft [6], military [7], as well as in biomedicine [8,9]. SPD is for example suitable for production of high-strength electro-conductive copper [10], consolidation of nano-scaled Al-based composites [11,12], improvement of corrosion resistance of pure Mg [13], enhancement of hydrogen sorption capacity of Mg [14], decreasing the elastic modulus of Tibased biocompatible alloys [15], and increasing the corrosion resistance of bio-applicable Mg-based alloys [16,17].…”

Section: Introductionmentioning

confidence: 99%

Natural ageing of aluminium processed by twist channel angular pressing

Kunčická¹,

Kocich²

2017

Fifth International Conference on Advances in Civil, Structural and Mechanical Engineering - CSM 2017

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-The method of twist channel angular pressing (TCAP) was invented with the aim to increase the efficiency of single pass severe plastic deformation (SPD) technologies. The study shows the structure of TCAP-processed aluminium after processing and the changes developed in the structure after a year of natural ageing at room temperature. The grain refinement after a single pass TCAP was very significant due to effectively imposed shear strain; the majority of grains were smaller than 5μm. The grains further showed sub-structure featuring fine precipitates, accumulated dislocations and developed subgrains. Transmission electron microscopy of the one-year-aged samples showed increased precipitation; the precipitates acted as effective obstacles for grain growth and structure recovery. The microscopy results were supplemented with microhardness measurements, the results of which showed a significant hardening for the single pass TCAP, after which the average microhardness increased from 44.6 HV to more than 91 HV.

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“…The information on CGPed magnesium alloys is limited. For instance Ratna Sunil et al [16] studied the wettability and corrosion resistance of groove pressed (GP) AZ31 magnesium alloy and showed the prospects in its application as implants instead of expensive titanium. Continuous casting techniques, such as twin-roll casting (TRC), are becoming more popular due to the presence of the much higher solid solution supersaturation and uniform grain size distribution [17].…”

Section: Introductionmentioning

confidence: 99%

The study of microstructure and mechanical properties of twin-roll cast AZ31 magnesium alloy after constrained groove pressing

Zimina

Bohlen²,

Letzig³

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

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View the article online for updates and enhancements. Abstract. Microstructure investigation and microhardness mapping were done on the material with ultra-fine grained structure prepared by constrained groove pressing of twin-roll cast AZ31 magnesium strips. The microstructure observations showed significant drop of the grain size from 200 µm to 20 µm after constrained groove pressing. Moreover, the heterogeneities in the microhardness along the cross-section observed in the as-cast strip were replaced by the bands of different microhardness in the constrained groove pressed material. It is shown that the constrained groove pressing technique is a good tool for the grain refinement of magnesium alloys.

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Role of biomineralization on the degradation of fine grained AZ31 magnesium alloy processed by groove pressing

Cited by 85 publications

References 41 publications

Laser surface modification of AZ31B Mg alloy for bio-wettability

Laser surface modification of AZ31B Mg alloy for bio-wettability

Natural ageing of aluminium processed by twist channel angular pressing

The study of microstructure and mechanical properties of twin-roll cast AZ31 magnesium alloy after constrained groove pressing

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