Microstructure, mechanical and corrosion properties of Mg–Nd–Zn–Sr–Zr alloy as a biodegradable material

Zhang, X. B.; Zhang, Y.; Chen, K.; Ba, Zhixin; Wang, Z. Z.; Wang, Q.

doi:10.1179/1743284714y.0000000661

Cited by 18 publications

(13 citation statements)

References 43 publications

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“…For orthopaedic applications, research results show that there are other alloys that have many advantages over Ti-6Al-4V, examples being 1) wrought Ti-13Zr-13Nb: (i) its modulus of elasticity is 45% lower and, as such, has lower potential for stress shielding and, hence, for ensuing osteolysis [66]; and (ii) having no Al, it has no potential for involvement in the etiology of Alzheimer's disease [67,68]; 2) porous Ti-(4-10) Mo alloys [69], and 3) porous Co-Cr alloy: its modulus of elasticity is 55% lower [70]. For the scaffold of a bioabsorbable coronary artery stent, new Mg-based alloys, such as wrought Mg-Nd-Sr-Zr, Mg-Gd-Nd-Zn-Zr, and Fe-35Mn alloys, powder-metallurgy Fe-Au and Fe-Ag alloys, and highly-porous Mg-Y and Mg-Y-Zn-Ca-Mn alloys are being evaluated [71][72][73][74]. New alloys that show good potential for applications as both bioresorbable TJRs and coronary artery stent scaffolds include Mg-0.63 Ca and Mg-0.89Ca [75].…”

Section: Directions For Future Researchmentioning

confidence: 99%

Nanostructured Hydroxyapatite Coating on Bioalloy Substrates: Current Status and Future Directions

Lewis¹

2017

JAN

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Abstract. Several shortcomings of the alloys that are used to fabricate a number of currentgeneration biomedical implants, such as Ti-6Al-4V alloy for the femoral stem of a total hip replacement and AZ3 Mg alloy for the scaffold of a fully bioabsorbable coronary artery stent, are well-known. Examples of these shortcomings are limited bioactivity/osseointegration (in the case of Ti-based alloys) and high corrosion rate (in the case of Mg-based alloys). It is now recognized that a nanostructured hydroxyapatite (nanoHA) coating on the substrate of a bioalloy can increase bioactivity and reduce corrosion of the substrate. A large number of nanoHA deposition methods and a variety of characterization techniques/methods have been used to obtain an assortment of properties of the coating, the coated specimens, and the coating-substrate interface. Examples of these deposition methods are electrophoretic deposition and radiofrequency magnetron sputtering and some of the most frequently used characterization techniques/methods are x-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, atomic force microscopy, immersion tests in a biosimulating solution at 37 o C, and culturing in cells extracted from humans. Among the properties obtained are the morphology, thickness, size of the nanoHA; degree of crystallinity of the coating; and the adhesive strength and corrosion rate in an aqueous biosimulating solution at 37 o C. The present work is a comprehensive review of the very large body of literature in this field, with the focal topics being essential steps in a deposition method, discussion of the influence of deposition method variables on myriad coating properties (for a given deposition method), and identification of the shortcomings of the literature, and, hence, outlines of ten suggested directions for future research.

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Section: Directions For Future Researchmentioning

confidence: 99%

Nanostructured Hydroxyapatite Coating on Bioalloy Substrates: Current Status and Future Directions

Lewis¹

2017

JAN

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“…The corrosion current densities of the blank control samples were similar, indicating that the corrosion reaction of AZ80 Mg alloy was stable. 35 In practical applications, the high-strength AZ80 Mg alloy in this study was coupled with QBe1.7 Cu alloy in the field of aerospace, servicing in the typical marine atmospheric environment. The galvanic current densities of different couples were larger than 15 μA cm −2 , as shown in Fig.…”

Section: Electrochemical Test and Galvanic Corrosion Sensitivitymentioning

confidence: 99%

Corrosion behaviour of AZ80 Mg/beryllium–bronze–alloy galvanic couples in typical marine environment

Zhang

et al. 2016

Materials Science and Technology

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A high-strength AZ80 Mg alloy was prepared via multi-direction forge, thermal extrusion and peak-aged heat treatment. The corrosion behaviour of AZ80 Mg/beryllium–bronze–alloy galvanic couples in a typical marine environment was investigated. Beryllium–bronze alloy (QBe1.7 Cu) acted as cathode, accelerating the corrosion of AZ80 Mg alloy. With the increase in contact areas, the corrosion rates and galvanic effect also increased, and the galvanic potentials moved positively. However, with a prolonged exposure time, the galvanic potentials and current densities decreased. The corrosion products mainly consisted of MgCl2, Mg5(CO3)4(OH)2·5H2O and MgSO4·7H2O. According to the standard of galvanic corrosion sensitivity from the Air Force Materials Laboratory (AFML), AZ80 Mg alloy was not allowed to make contact with QBe1.7 Cu alloy without effective protection.

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“…6 The elongation of the as extruded Mg-2.5Nd-0.3Zn-0.1Sr-0.4Zr alloy is up to 36.6%, but the yield strength is only 151 MPa. 7 Li et al 8 studied the mechanical properties of the Mg-1Zn-xSr (x = 0.2, 0.5, 0.8 and 1.0) alloys after backward extrusion, and the results showed that the elongation and yield strength of all the four alloys are < 13% and 130 MPa respectively. It has been reported that the elongation of the as rolled and aged Mg-4Zn-1Sr alloy is < 15%.…”

Section: Introductionmentioning

confidence: 98%

Enhanced mechanical and corrosion properties of NZ20K alloy by double extrusion and aging processes for biomedical applications

Chen

Zhang

Dai

et al. 2016

Materials Technology

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In order to refine and homogenise microstructure and to improve mechanical properties of the magnesium alloys for biomedical application, the Mg-2.0Nd-0.1Zn-0.4Zr (wt-%, NZ20K) alloy with low amount of alloying elements was processed by double extrusion and aging processes (DEAP). Compared to the NZ20K alloy after once extrusion and aging processes (OEAP), the microstructure becomes finer and more homogeneous, and the elongation is raised up ∼121% by DEAP. Moreover, the yield strength and ultimate tensile strength are improved ∼27 and ∼16% respectively. Additionally, the corrosion rate of the NZ20K alloy by the DEAP is a little slower than that of the OEAP. It can be concluded that the mechanical properties, as well as the corrosion resistance of the NZ20K alloy, are able to be enhanced by the double extrusion and aging processes.

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Microstructure, mechanical and corrosion properties of Mg–Nd–Zn–Sr–Zr alloy as a biodegradable material

Cited by 18 publications

References 43 publications

Nanostructured Hydroxyapatite Coating on Bioalloy Substrates: Current Status and Future Directions

Nanostructured Hydroxyapatite Coating on Bioalloy Substrates: Current Status and Future Directions

Corrosion behaviour of AZ80 Mg/beryllium–bronze–alloy galvanic couples in typical marine environment

Enhanced mechanical and corrosion properties of NZ20K alloy by double extrusion and aging processes for biomedical applications

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