Optimization of biocompatibility in a laser surface treated Mg-AZ31B alloy

Lu, Jonathan Z.; Joshi, Sameehan S.; Pantawane, Mangesh V.; Ho, Yee‐Hsien; Wu, Tso-Chang; Dahotre, Narendra B.

doi:10.1016/j.msec.2019.110028

Cited by 29 publications

(17 citation statements)

References 39 publications

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“…In above equations ρ is the density of the material (kg m −3 ), p is the pressure (N m −2 ), I is the identity matrix, C p is the specific heat of the material (J kg −1 K), → u is the fluid velocity (m/s), and µ is the dynamic viscosity 8,16,17 . Further additional equations corresponding to fluid dynamics and the details related to computational modeling of laser material-interaction during laser-based materials processing and manufacturing were adopted from earlier work by the authors [18][19][20] .…”

Section: Numerical Modelingmentioning

confidence: 99%

Computational Assessment of Thermokinetics and Associated Microstructural Evolution in Laser Powder Bed Fusion Manufacturing of Ti6Al4V Alloy

Pantawane

Joshi

et al. 2020

Sci Rep

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Although most of the near non-equilibrium microstructures of alloys produced by laser powder bed fusion (LPBF) additive manufacturing (AM) are being reported at a rapid rate, the accountable thermokinetics of the entire process have rarely been studied. In order to exploit the versatility of this AM process for the desired properties of built material, it is crucial to understand the thermokinetics associated with the process. In light of this, a three-dimensional thermokinetic model based on the finite element method was developed to correlate with the microstructure evolved in additively manufactured Ti6Al4V alloy. The computational model yielded the thermal patterns experienced at given location while building a single layer through multiple laser scans and a whole part through multiple layers above it. X-ray analysis of the resultant microstructure confirmed the presence of acicular martensitic (α′) phase of (002) texture within the build-plane. Computationally predicted magnitude of the thermal gradients within the additively manufactured Ti6Al4V alloy in different directions (X, Y, and Z) facilitated the understanding about the evolution of grain morphology and orientation of acicular martensite in prior β grains. The scanning electron microscopy observations of the alloy revealed the distinct morphology of phase precipitated within the martensitic phase, whose existence was, in turn, understood through predicted thermal history.

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Section: Numerical Modelingmentioning

confidence: 99%

Computational Assessment of Thermokinetics and Associated Microstructural Evolution in Laser Powder Bed Fusion Manufacturing of Ti6Al4V Alloy

Pantawane

Joshi

et al. 2020

Sci Rep

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“…The low density of magnesium, which is 36 and 78% lighter than aluminium and steel, respectively, makes it the most promising candidate for lighting sources [6] and energy storage like water/seawater-activated magnesium batteries [7]. Moreover, Mg-based alloys are attractive candidates for using in biomedical engineering as biodegradable temporary implants [8][9][10]. However, traditionally, Mg-based alloys comprise less than 1% of a vehicle's weight [11].…”

Section: Introductionmentioning

confidence: 99%

On the evolution of microstructure, texture and corrosion behavior of a hot-rolled and annealed AZ31 alloy

Tighiouaret

Hanna

Azzeddine

et al. 2021

Materials Chemistry and Physics

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The microstructure and texture evolution of an AZ31 alloy were investigated after hot rolling and subsequent annealing using electron backscatter diffraction (EBSD). First, the alloy was hot-rolled at 350 °C up to low, medium and high strain (20, 50 and 85% of thickness reduction, respectively). The alloy samples where then annealed at 350 °C for 2, 10 and 60 minutes. The effect of strain level and annealing on corrosion behavior in seawater was also evaluated using electrochemical tests. At low strain, the microstructure was characterised by the absence of twinning, mainly due to the prior thermo-mechanical history of the as-received alloy. However, various modes of twinning were observed at medium strain. At high strain, the dynamic recrystallization process resulted in a microstructure with a typical basal texture. The results demonstrate that twins are responsible for the deviation of {0002} basal poles from normal towards the transversal direction. Annealing at 350°C for up to 60 min led to normal grain growth in all the samples. In medium and highly strained samples, the deformation texture was retained, while the low strain sample underwent noticeable changes due to the absence of dynamic recrystallization. A synergetic effect of grain refinement and texture weakening was responsible for the alloy's enhanced corrosion resistance.

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“…[5,6] They are also widely used in automobile, aerospace, and other high-end manufacturing industries. [7,8] Moreover, the standard electrode potentials of Mg alloys are so low that their specific mass loss rates are high in environments containing chloride ions. [9,10] At the same time, the low purity Mg may lead to an Fe content above the tolerance limit and consequently substantial corrosion rates.…”

Section: Introductionmentioning

confidence: 99%

Corrosion decomposition and mechanical behaviors of As‐cast Mg–xZn–Zr alloys

Zhou

Tian

et al. 2020

Materials & Corrosion

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Developing new‐type alloy materials with excellent decomposition properties and mechanical behaviors is a thorny issue for preparing fracturing balls in oil exploitation. As‐cast Mg–xZn–Zr alloys designed by regulating Zn contents have been fabricated in this study. Compressive strength and immersion corrosion test have been investigated to assess their feasibility as decomposition materials. Scanning electron microscopy and X‐ray diffract meter have also been used to characterize surface morphologies and phase structures for determining their decomposition mechanism. Results show that matrix phases and secondary phases with discontinuous reticular features form on the alloys. They also achieve excellent mechanical properties to ensure stability and pressure‐maintaining capacity in the decomposition process in chloride environment. Meanwhile, with Zn content and immersion time increasing, galvanic corrosion effect strengthens leading to accelerated specific mass loss rates of the alloys. Rapid corrosion decomposition of the alloys mainly attributes to anodic dissolution of matrix phases, exfoliation of microparticles, and poor resistance of corrosion products to the decomposition process. This study provides positive insight into the preparation of new‐type Mg alloys for guaranteeing fast decomposition of fracturing balls and also ensuring their compressive strength stability.

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Optimization of biocompatibility in a laser surface treated Mg-AZ31B alloy

Cited by 29 publications

References 39 publications

Computational Assessment of Thermokinetics and Associated Microstructural Evolution in Laser Powder Bed Fusion Manufacturing of Ti6Al4V Alloy

Computational Assessment of Thermokinetics and Associated Microstructural Evolution in Laser Powder Bed Fusion Manufacturing of Ti6Al4V Alloy

On the evolution of microstructure, texture and corrosion behavior of a hot-rolled and annealed AZ31 alloy

Corrosion decomposition and mechanical behaviors of As‐cast Mg–xZn–Zr alloys

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