Laser rapid solidification improves corrosion behavior of Mg-Zn-Zr alloy

Shuai, Cijun; Wu, Ping; Lin, Xin; Liu, Yong; Zhou, Yan; Feng, Pei; Liu, Xinyan; Peng, Shuping

doi:10.1016/j.jallcom.2016.09.019

Cited by 118 publications

(72 citation statements)

References 30 publications

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“…Conventionally cast magnesium alloys are generally characterized by a coarse microstructure consisting of primary α-Mg and lamellar eutectic (α-Mg + intermetallic) phases with an average grain size in the range of 50-150 µm. However, rapid cooling rates associated along with epitaxial solidification in the SLM process, results in a highly refined microstructure in magnesium alloys with grain sizes of α-Mg matrix in the range of 1-20 µm and often favour the formation of partially or fully divorced eutectic (separation of eutectic phases) homogenously distributed along the grain boundaries of dendritic/columnar primary α-Mg (Figure 8) [49,61]. SLM, being a non-equilibrium process, can extend the solubility of alloying elements in Mg and obtain single-phase Mg alloys with wider composition range [61].…”

Section: Microstructurementioning

confidence: 99%

“…In the process of laser rapid melting, very high temperature gradients generated in the melt pool contribute to the formation of a strong Marangoni convection and result in improved homogenous dispersion of alloying elements in the melt pool [62]. Then a subsequent high rate growth of the solid/liquid interface contributes towards "solute capture" phenomenon in α-Mg matrix, resulting in larger amounts of solute atoms to be captured, extending the solid solution limit of alloying elements in α-Mg and retarding the nucleation β-phases [49,61]. Such compositional changes can influence the microstructure, mechanical properties, and corrosion behaviour of laser-melted magnesium alloys.…”

Section: Microstructurementioning

confidence: 99%

“…Such compositional changes can influence the microstructure, mechanical properties, and corrosion behaviour of laser-melted magnesium alloys. [49] Dendritic/columnar α-Mg; Mg7Zn3 70.1-89.2 --* Only single tracks were used (Details regarding process parameters used in these studies can be found in Table 2). …”

Section: Microstructurementioning

confidence: 99%

“…Homogenous distribution of the precipitates formed around the grains during SLM processing of (a) AZ91D alloy at 166.7 J/mm 3 [61] and (b) ZK60 alloy at 600 J/mm 3 [49]. Table 2).…”

Section: Figurementioning

confidence: 99%

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Selective Laser Melting of Magnesium and Magnesium Alloy Powders: A Review

Manakari

Parande

Gupta

2016

Metals

190

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Magnesium-based materials are used primarily in developing lightweight structures owing to their lower density. Further, being biocompatible they offer potential for use as bioresorbable materials for degradable bone replacement implants. The design and manufacture of complex shaped components made of magnesium with good quality are in high demand in the automotive, aerospace, and biomedical areas. Selective laser melting (SLM) is becoming a powerful additive manufacturing technology, enabling the manufacture of customized, complex metallic designs. This article reviews the recent progress in the SLM of magnesium based materials. Effects of SLM process parameters and powder properties on the processing and densification of the magnesium alloys are discussed in detail. The microstructure and metallurgical defects encountered in the SLM processed parts are described. Applications of SLM for potential biomedical applications in magnesium alloys are also addressed. Finally, the paper summarizes the findings from this review together with some proposed future challenges for advancing the knowledge in the SLM processing of magnesium alloy powders.

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Section: Microstructurementioning

confidence: 99%

Section: Microstructurementioning

confidence: 99%

Section: Microstructurementioning

confidence: 99%

“…Homogenous distribution of the precipitates formed around the grains during SLM processing of (a) AZ91D alloy at 166.7 J/mm 3 [61] and (b) ZK60 alloy at 600 J/mm 3 [49]. Table 2).…”

Section: Figurementioning

confidence: 99%

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Selective Laser Melting of Magnesium and Magnesium Alloy Powders: A Review

Manakari

Parande

Gupta

2016

Metals

190

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“…To analyze the XRD patterns accurately, a magnification view of the XRD patterns was shown in Figure 5b. In comparison with the standard α-Mg phase peak location (36.618 • ) [23], the α-Mg phase diffraction peaks location of SLMed AZ61 obviously shifted to high angles. Since atomic radii of Al (0.1199 nm) was 89.95% of Mg (0.1333 nm), Al acted as a substitutive solute in the α-Mg according to the theory of solid solution [24].…”

Section: Phase and Dispersionmentioning

confidence: 81%

Microstructure Evolution and Biodegradation Behavior of Laser Rapid Solidified Mg–Al–Zn Alloy

Bin

et al. 2017

Metals

Self Cite

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Abstract:The too fast degradation of magnesium (Mg) alloys is a major impediment hindering their orthopedic application, despite their superior mechanical properties and favorable biocompatibility. In this study, the degradation resistance of AZ61 (Al 6 wt. %, Zn 1 wt. %, remaining Mg) was enhanced by rapid solidification via selective laser melting (SLM). The results indicated that an increase of the laser power was beneficial for enhancing degradation resistance and microhardness due to the increase of relative density and formation of uniformed equiaxed grains. However, too high a laser power led to the increase of mass loss and decrease of microhardness due to coarsened equiaxed grains and a reduced solid solution of Al in the Mg matrix. In addition, immersion tests showed that the apatite increased with the increase of immersion time, which indicated that SLMed AZ61 possessed good bioactivity.

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Toward understanding in vivo corrosion: Influence of interfacial hydrogen gas build‐up on degradation of magnesium alloy implants

Kuah

Wijesinghe

Blackwood

2022

J Biomedical Materials Res

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Limited material transport, causing gas cavities formation, is commonly observed during the degradation of magnesium implants, yet its effects on corrosion are not understood. Herein, a bespoke cell was designed, allowing for the incorporation of an additional agarose layer above the corroding magnesium sample. This design replicates the limited material transport in vitro and enables us to understand its influence on corrosion of magnesium alloys. This work investigated the influence of varying thickness of agarose (0-0.9 mm) on the corrosion of Mg-Zn-Zr magnesium alloy maintained at 37 C in phosphate-buffered saline (PBS). The introduction of agarose slowed transport of material away from the corroding magnesium surface, including the evolved hydrogen forming a gas cavity. It has been found that an initial increase in the agarose thickness (or the reduction in material transport) of 0.3 mm leads to an increase in the corrosion rate of the magnesium alloy by 62%. However, with a further increase in agarose thickness from 0.3 to 0.9 mm, the corrosion rate decreases by 37%. This observation has been attributed to the accumulation of, and competition between, chloride and hydroxide ions near the alloy's surface. In the presence of materials barrier, hydrogen measurement is no longer a reliable method for the measurement of corrosion rates. This study underscores the importance of the consideration of limited material transport during the in vitro corrosion tests of biomedical implants.

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Laser rapid solidification improves corrosion behavior of Mg-Zn-Zr alloy

Cited by 118 publications

References 30 publications

Selective Laser Melting of Magnesium and Magnesium Alloy Powders: A Review

Selective Laser Melting of Magnesium and Magnesium Alloy Powders: A Review

Microstructure Evolution and Biodegradation Behavior of Laser Rapid Solidified Mg–Al–Zn Alloy

Toward understanding in vivo corrosion: Influence of interfacial hydrogen gas build‐up on degradation of magnesium alloy implants

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