Effects of Ho on the microstructure and mechanical properties of Mg-Zn-Ho-Zr magnesium alloys

Li, Daquan; Wang, Qudong; Ding, Wenjiang

doi:10.1007/s12598-011-0211-y

Cited by 16 publications

(6 citation statements)

References 18 publications

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“…In this study, the Mg-Ho phases were identified as MgHo 3 and Mg 2 Ho, which differs from the reported Mg-Zn-Ho phases 15 and the Mg 24 Ho 5 phase along the grain boundaries 36 . An isolation between Sr and the Mg matrix was introduced with the increased addition of Ho (EDX mapping, Fig.…”

Section: Discussioncontrasting

confidence: 92%

“…Among REEs, Ho (>0.5 wt. % hereafter) has been used to enhance the tensile properties of Mg-Zn-Al due to the reduction of the petal-like phase 14 and Ho also displays potential effects on grain refinement, resulting in significant improvement in strength and plasticity 15 . However, in view of the performance of Ho in relation to biocompatibility, a limited number of studies made comparisons under identical experimental conditions 16 17 .…”

mentioning

confidence: 99%

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Mechanical properties, in vitro corrosion and biocompatibility of newly developed biodegradable Mg-Zr-Sr-Ho alloys for biomedical applications

Ding

Lin

Wen

et al. 2016

Sci Rep

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Our previous studies have demonstrated that Mg-Zr-Sr alloys can be anticipated as excellent biodegradable implant materials for load-bearing applications. In general, rare earth elements (REEs) are widely used in magnesium (Mg) alloys with the aim of enhancing the mechanical properties of Mg-based alloys. In this study, the REE holmium (Ho) was added to an Mg-1Zr-2Sr alloy at different concentrations of Mg1Zr2SrxHo alloys (x = 0, 1, 3, 5 wt. %) and the microstructure, mechanical properties, degradation behaviour and biocompatibility of the alloys were systematically investigated. The results indicate that the addition of Ho to Mg1Zr2Sr led to the formation of the intermetallic phases MgHo3, Mg2Ho and Mg17Sr2 which resulted in enhanced mechanical strength and decreased degradation rates of the Mg-Zr-Sr-Ho alloys. Furthermore, Ho addition (≤5 wt. %) to Mg-Zr-Sr alloys led to enhancement of cell adhesion and proliferation of osteoblast cells on the Mg-Zr-Sr-Ho alloys. The in vitro biodegradation and the biocompatibility of the Mg-Zr-Sr-Ho alloys were both influenced by the Ho concentration in the Mg alloys; Mg1Zr2Sr3Ho exhibited lower degradation rates than Mg1Zr2Sr and displayed the best biocompatibility compared with the other alloys.

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Section: Discussioncontrasting

confidence: 92%

mentioning

confidence: 99%

Mechanical properties, in vitro corrosion and biocompatibility of newly developed biodegradable Mg-Zr-Sr-Ho alloys for biomedical applications

Ding

Lin

Wen

et al. 2016

Sci Rep

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“…It can be revealed that holmium acts as a grain refiner to this alloy. Li et al [17] found that the addition of 2.0 wt.% Ho has a great refinement effect on Mg-Zn-Zr alloys compared to the base alloys. This finding is also supported by Le et al [19].…”

Section: Resultsmentioning

confidence: 99%

“…Previous studies have been reported that holmium additions are mainly attributed to the precipitation of the β′-Mg 15 RE 3 (Gd/Ho) metastable phase [16]. The others researcher also announced that by adding the holmium into the magnesium alloy leads to the high ultimate tensile strength and also played an important role in grain refinement effect [17].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Holmium on the Microstructure and Hardness of Mg-Nd-Gd-Zn-Zr Alloys

Ahmad

Shahizan

Asmael

et al. 2017

KEM

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The influence of holmium on the microstructure and hardness of Mg-Nd-Gd-Zn-Zr alloys were investigated. Conventional casting methods are used to produce the alloys. All the results were characterized by optical microscopy, scanning electron microscope (SEM) and the Vickers hardness test to highlight the influence of holmium addition. The addition of 2.0 wt.% holmium leads to the combination of rare earth elements which formed Mg-Zn-Nd-Ho phase. The results have shown the addition of Ho improved the microstructure and hardness of Mg-Nd-Gd-Zn-Zr alloys. By adding grain size of 2.0 wt.% holmium had reduced by 18.43%, while the volume fraction increased by 7.34%. The Vickers hardness value improved 6.18% due to the grain refine and volume fraction precipitates. The 2.0 wt.% holmium addition showed a positive result in microstructure and hardness value.

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“…Zinc additions improve mechanical and corrosion performance while reducing hydrogen evolution. However, at high concentrations (≥5%), Zn leads to poor corrosion resistance and mechanical strength, including reduced biocompatibility [6][7][8][9][10][11][12][13][14][15]23,61,63,64].…”

Section: Mg Alloying Systemsmentioning

confidence: 99%

Designing Advanced Biomedical Biodegradable Mg Alloys: A Review

Jamel

Jamel²,

López

2022

Metals

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The increased demand for alloys that can serve as implantation devices with outstanding bio-properties has led to the development of numerous biomedical Mg-based alloys. These alloys have been extensively investigated for their performance in living tissue with mixed results. Hence, there are still major concerns regarding the use of magnesium alloys for such applications. Among the issues raised are elevated corrosion rates, hydrogen generation, and the maintenance of mechanical integrity for designated healing times. In addition, toxicity can arise from the addition of alloying elements that are intended to improve the mechanical integrity and corrosion resistance of Mg alloys. The current work reviews the recent advances in the development of Mg alloys for applications as bio-absorbable materials in living organic environments. In particular, it attempts to develop a roadmap of effective factors that can be utilized when designing Mg alloys. Among the factors reviewed are the effects of alloying additions and processing methods on the exhibited mechanical properties and corrosion rates in simulated bio-fluids used in biomedical applications.

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Effects of Ho on the microstructure and mechanical properties of Mg-Zn-Ho-Zr magnesium alloys

Cited by 16 publications

References 18 publications

Mechanical properties, in vitro corrosion and biocompatibility of newly developed biodegradable Mg-Zr-Sr-Ho alloys for biomedical applications

Mechanical properties, in vitro corrosion and biocompatibility of newly developed biodegradable Mg-Zr-Sr-Ho alloys for biomedical applications

The Influence of Holmium on the Microstructure and Hardness of Mg-Nd-Gd-Zn-Zr Alloys

Designing Advanced Biomedical Biodegradable Mg Alloys: A Review

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