Improved mechanical performance and delayed corrosion phenomena in biodegradable Mg–Zn–Ca alloys through Pd-alloying

González, S.; Pellicer, Eva; Fornell, Jordina; Blanquer, Andreu; Barrios, Leonardo; Ibáñez, Elena; Solsona, P.; Suriñach, S.; Baró, Maria Dolores; Nogués, Carme; Sort, Jordi

doi:10.1016/j.jmbbm.2011.09.014

Cited by 75 publications

(25 citation statements)

References 30 publications

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“…The small atomic size difference between Al and Pd does not favor the atomic packing, which may explain why the GFA decreases. 33 The addition of Pd to Mg 72 Zn 23 Ca 5 alloy also decreases the GFA, 53 as can be deduced from the diffraction patterns in Fig. 3.…”

Section: Addition Of Transition Elementsmentioning

confidence: 73%

Role of minor additions on metallic glasses and composites

González

2015

J. Mater. Res.

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Microalloying refers to the addition of a small concentration of an alloying element to tune the properties of the parent alloy. Microalloying technology enables to control the glass formation and the mechanical properties of bulk metallic glasses (BMGs). This manuscript presents a comprehensive review on recent developments and breakthroughs in the field of microalloying for tuning the properties of BMGs and composites with focus on the results. The ability of multiple element coaddition to optimize the glass formation and the importance of future alloy developments have been highlighted. Proper microalloying can be used to tailor not only the mechanical properties of the amorphous phase but also those of the crystalline phase, which opens up the possibility for tuning the mechanical performance at different length scales. The effectiveness in controlling the mechanical performance through microalloying was shown to greatly depend on the alloy composition and closeness to the critical amorphous diameter. A tentative outlook commenting the potential and challenges of this exciting field of research is also presented.

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Section: Addition Of Transition Elementsmentioning

confidence: 73%

Role of minor additions on metallic glasses and composites

González

2015

J. Mater. Res.

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“…The microstructure in Zr–Cu–Al alloys can be also tailored by changing the melting current during the casting process, even while keeping the composition constant, hence resulting in highly tunable mechanical properties [19]. The drastic change in microstructure with small compositional variations (of few at.%) is not unique of the Zr–Cu–Al system but has been observed for other MG composites, such as in Mg–Zn–Ca–(Pd) alloys [20]. …”

Section: Resultsmentioning

confidence: 99%

Drastic influence of minor Fe or Co additions on the glass forming ability, martensitic transformations and mechanical properties of shape memory Zr–Cu–Al bulk metallic glass composites

González

Pérez

Rossinyol

et al. 2014

Science and Technology of Advanced Materials

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The microstructure and mechanical properties of Zr48Cu48 − xAl4Mx (M ≡ Fe or Co, x = 0, 0.5, 1 at.%) metallic glass (MG) composites are highly dependent on the amount of Fe or Co added as microalloying elements in the parent Zr48Cu48Al4 material. Addition of Fe and Co promotes the transformation from austenite to martensite during the course of nanoindentation or compression experiments, resulting in an enhancement of plasticity. However, the presence of Fe or Co also reduces the glass forming ability, ultimately causing a worsening of the mechanical properties. Owing to the interplay between these two effects, the compressive plasticity for alloys with x = 0.5 (5.5% in Zr48Cu47.5Al4Co0.5 and 6.2% in Zr48Cu47.5Al4Fe0.5) is considerably larger than for Zr48Cu48Al4 or the alloys with x = 1. Slight variations in the Young’s modulus (around 5–10%) and significant changes in the yield stress (up to 25%) are also observed depending on the composition. The different microstructural factors that have an influence on the mechanical behavior of these composites are investigated in detail: (i) co-existence of amorphous and crystalline phases in the as-cast state, (ii) nature of the crystalline phases (austenite versus martensite content), and (iii) propensity for the austenite to undergo a mechanically-driven martensitic transformation during plastic deformation. Evidence for intragranular nanotwins likely generated in the course of the austenite–martensite transformation is provided by transmission electron microscopy. Our results reveal that fine-tuning of the composition of the Zr–Cu–Al–(Fe,Co) system is crucial in order to optimize the mechanical performance of these bulk MG composites, to make them suitable materials for structural applications.

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“…Besides, Zn is an essential element in human body and can promote the bone mineralization [6,7]. However, the biomedical application of Mg-Zn alloys is hindered mainly caused by their too rapid degradation, leading to the loss of the mechanical stability before the formation of new bone [8,9]. …”

Section: Introductionmentioning

confidence: 99%

Biodegradation Resistance and Bioactivity of Hydroxyapatite Enhanced Mg-Zn Composites via Selective Laser Melting

et al. 2017

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Mg-Zn alloys have attracted great attention as implant biomaterials due to their biodegradability and biomechanical compatibility. However, their clinical application was limited due to the too rapid degradation. In the study, hydroxyapatite (HA) was incorporated into Mg-Zn alloy via selective laser melting. Results showed that the degradation rate slowed down due to the decrease of grain size and the formation of protective layer of bone-like apatite. Moreover, the grain size continually decreased with increasing HA content, which was attributed to the heterogeneous nucleation and increased number of nucleation particles in the process of solidification. At the same time, the amount of bone-like apatite increased because HA could provide favorable areas for apatite nucleation. Besides, HA also enhanced the hardness due to the fine grain strengthening and second phase strengthening. However, some pores occurred owing to the agglomerate of HA when its content was excessive, which decreased the biodegradation resistance. These results demonstrated that the Mg-Zn/HA composites were potential implant biomaterials.

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Improved mechanical performance and delayed corrosion phenomena in biodegradable Mg–Zn–Ca alloys through Pd-alloying

Cited by 75 publications

References 30 publications

Role of minor additions on metallic glasses and composites

Role of minor additions on metallic glasses and composites

Drastic influence of minor Fe or Co additions on the glass forming ability, martensitic transformations and mechanical properties of shape memory Zr–Cu–Al bulk metallic glass composites

Biodegradation Resistance and Bioactivity of Hydroxyapatite Enhanced Mg-Zn Composites via Selective Laser Melting

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