Effect of laser surface melting on corrosion behaviour of AZ91D Mg alloy in simulated-modified body fluid

Guan, Yingchun; Zhou, Wei; Zheng, Hui

doi:10.1007/s10800-009-9825-2

Cited by 70 publications

(56 citation statements)

References 17 publications

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“…He described that after laser surface treatment, the refined continuous network of β-Mg 17 Al 12 phases within the surface can play as the anticorrosion barriers. In a simulated body fluid immersion test, the treatment Mg alloy performed to higher corrosion resistance than the un-treatment Mg alloy [11]. X.D.…”

Section: Laser Surface Modificationmentioning

confidence: 95%

“…Among the many several series of Mg alloys, AZ series Mg alloys are some of the most widely used Mg alloys in industry. This type of alloy can exist for longer period in vivo environments due to β-Mg 17 Al 12 intermetallic phase, which exhibits higher corrosion resistance than α-Mg matrix [11,12]. The effectiveness of β-Mg 17 Al 12 in corrosion resistance depends upon its concentration and distribution in matrix.…”

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confidence: 99%

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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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Section: Laser Surface Modificationmentioning

confidence: 95%

mentioning

confidence: 99%

Laser surface modification of AZ31B Mg alloy for bio-wettability

Vora

Dahotre

2014

J Biomater Appl

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“…Laser surface processing has been considered as an advanced alternative over conventional counterparts to improve the surface properties of materials [7,9]. It has been recognized that laser surface engineering can produce surface layers with a fine microstructure that reduce the size of galvanic couples and expand the solid solution range of alloying elements [6,9].…”

Section: Laser Shock Processing For Mg Alloymentioning

confidence: 99%

“…It has been recognized that laser surface engineering can produce surface layers with a fine microstructure that reduce the size of galvanic couples and expand the solid solution range of alloying elements [6,9]. Such factors can potentially improve surface performance of laser-treated metallic alloys.…”

Section: Laser Shock Processing For Mg Alloymentioning

confidence: 99%

Development of Anti-Corrosion Processing on Magnesium Alloys

Sun

Ying²

2015

Mod Chem Appl

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“…Typical cellular/dendrite structure was observed, and the penetration depth of the laser-melted zone was more than 100 mm. Moreover, the refined microstructure was not uniform in the melt zone and coarse network of b-Mg 17 Al 12 along the overlapped regions might be formed due to the inadequate energy distribution near the tail of Gaussian distribution in the laser beam together with the remelt process during laser irradiation [18,72,73]. Heat-affected zone (HAZ) in our experiment was very small due to the rapid laser heating and subsequent rapid cooling, and the depth of HAZ is typically less than 50 mm.…”

Section: Effect Of Laser-induced Various Wettability On Liquid Flowmentioning

confidence: 99%