Microstructural, mechanical and corrosion characterization of an as-cast Mg–3Zn–0.4Ca alloy for biomedical applications

Pulido-González, N.; Torres, B.; Rodrigo, P.; Hort, Norbert; Rams, J.

doi:10.1016/j.jma.2020.02.007

Cited by 46 publications

(11 citation statements)

References 43 publications

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“…The flexural strain was calculated according to Equation (3):

where D is the maximum deflection of the center of the substrate, d is the height of the sample, and L is the support span length. To obtain the flexural stress Equation (4) was used:

where F is the maximum load and b is the width of the tested sample [ 31 , 32 ].…”

Section: Methodsmentioning

confidence: 99%

Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel

et al. 2021

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In additive manufacturing (AM), the technology and processing parameters are key elements that determine the characteristics of samples for a given material. To distinguish the effects of these variables, we used the same AISI 316L stainless steel powder with different AM techniques. The techniques used are the most relevant ones in the AM of metals, i.e., direct laser deposition (DLD) with a high-power diode laser and selective laser melting (SLM) using a fiber laser and a novel CO2 laser, a novel technique that has not yet been reported with this material. The microstructure of all samples showed austenitic and ferritic phases, which were coarser with the DLD technique than for the two SLM ones. The hardness of the fiber laser SLM samples was the greatest, but its bending strength was lower. In SLM with CO2 laser pieces, the porosity and lack of melting reduced the fracture strain, but the strength was greater than in the fiber laser SLM samples under certain build-up strategies. Specimens manufactured using DLD showed a higher fracture strain than the rest, while maintaining high strength values. In all the cases, crack surfaces were observed and the fracture mechanisms were determined. The processing conditions were compared using a normalized parameters methodology, which has also been used to explain the observed microstructures.

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“…The flexural strain was calculated according to Equation (3):

where D is the maximum deflection of the center of the substrate, d is the height of the sample, and L is the support span length. To obtain the flexural stress Equation (4) was used:

where F is the maximum load and b is the width of the tested sample [ 31 , 32 ].…”

Section: Methodsmentioning

confidence: 99%

Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel

et al. 2021

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“…Not only do Mg alloys exhibit excellent biocompatibility and natural biodegradability, they also exhibit low density (1.7-2.0 g/cm 3 ) and strength in excess of 250 MPa. Notably, the elastic moduli of Mg-based alloys (40)(41)(42)(43)(44)(45) are better compared to the stiffness of cortical bones (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) than those of conventional metallic materials used as permanent implants (c.f., ~200 GPa for stainless steel, ~230 GPa for cobalt-based alloys, and ~115 GPa for titanium alloys [10]), which helps to eliminate the stress-shielding effect hindering the healing process.…”

Section: Introductionmentioning

confidence: 99%

“…Among hundreds of Mg-based alloy compositions proposed for orthopaedic applications, tertiary Mg-Zn-X alloys are by far the most studied due to their outstanding properties profile, both in vitro and in vivo. Ca, Y, and Zr are by far the most popular additions to Mg-Zn systems when seeking a balanced combination of mechanical and biofunctional properties [11][12][13][14][15][16][17][18][19][20][21][22][23]. The commercial alloy ZK60 has been proven versatile enough for processing by various techniques, from conventional extrusion and rolling to a wide range of severe plastic deformation techniques, resulting in substantial microstructure refinement and the enhancement of tensile [24], fatigue [25] and corrosion properties [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

On the Corrosion Fatigue of Magnesium Alloys Aimed at Biomedical Applications: New Insights from the Influence of Testing Frequency and Surface Modification of the Alloy ZK60

et al. 2022

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Magnesium alloys are contemporary candidates for many structural applications of which medical applications, such as bioresorbable implants, are of significant interest to the community and a challenge to materials scientists. The generally poor resistance of magnesium alloys to environmentally assisted fracture, resulting, in particular, in faster-than-desired bio-corrosion degradation in body fluids, strongly impedes their broad uptake in clinical practice. Since temporary structures implanted to support osteosynthesis or healing tissues may experience variable loading, the resistance to bio-corrosion fatigue is a critical issue that has yet to be understood in order to maintain the structural integrity and to prevent the premature failure of implants. In the present communication, we address several aspects of the corrosion fatigue behaviour of magnesium alloys, using the popular commercial ZK60 Mg-Zn-Zr alloy as a representative example. Specifically, the effects of the testing frequency, surface roughness and metallic coatings are discussed in conjunction with the fatigue fractography after the testing of miniature specimens in air and simulated body fluid. It is demonstrated that accelerated environmentally assisted degradation under cyclic loading occurs due to a complicated interplay between corrosion damage, stress corrosion cracking and cyclic loads. The occurrence of corrosion fatigue in Mg alloys is exaggerated by the significant sensitivity to the testing frequency. The fatigue life or strength reduced remarkably with a decrease in the test frequency.

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“…Biomaterials are considered non-viable materials used in medical devices for centuries and are intended to interact with biological systems. 1,2 These materials develop various biomedical devices to provide the necessary healing effect to the injured tissues. However, most biomedical devices have been used predominantly for healing bone tissues.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the mechanical and corrosion properties of Mg-Hydroxyapatite composite by addition of rare-earth oxide particulates for biomedical applications

Aggarwal

Singla

Sharma

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Magnesium has gained much attention as advanced light-weight material and have been extensively used in orthopedic applications. Its bone-like properties and non-toxic behavior have established it as a splendid bone implant with excellent biodegradability and biocompatibility; however, its corrosion properties have exploited its usage and need to be addressed. The current study emphasized the influence of rare-earth oxide, that is, Neodymium oxide (Nd2O3/NdO) on the mechanical and corrosion properties of Mg-Hydroxyapatite (HAP) composite. In this work, Mg-HAP-xNdO ( x = 1%, 1.5%, and 2%) was fabricated via powder metallurgy route using Box-Behnken design methodology with different sintering temperatures (400°C, 450°C, and 500°C) and sintering time (1, 2, and 3 h). The results showed that the addition of NdO to the composite developed various intermetallic phases such as Mg12Nd and Nd0.5Ca0.5 as analyzed through FESEM, XRD, and EDS techniques, producing refined microstructure. It was formalized that Mg-HAP composites containing 1.5% NdO, sintered at 400°C for 2 h showed the lowest corrosion rates as compared to other samples. Moreover, the secondary β-phase developed provided necessary reinforcement to the Mg-HAP composites and prevented deformation, resulting in improved microhardness (48.50 HV), ultimate compressive (UCS) (116.57 MPa), tensile strength (UTS) (154.23 MPa) at 1.5% NdO (400°C-2 h). In addition, the statistical analysis performed via the ANOVA technique confirmed the experimental results by revealing significant effects of sintering temperature and combination of all the three parameters on the microhardness and compressive strength of the composites. Hence, these findings concluded that the Mg-HAP-NdO composite could be a promising candidate for orthopedic implant applications.

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Microstructural, mechanical and corrosion characterization of an as-cast Mg–3Zn–0.4Ca alloy for biomedical applications

Cited by 46 publications

References 43 publications

Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel

Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel

On the Corrosion Fatigue of Magnesium Alloys Aimed at Biomedical Applications: New Insights from the Influence of Testing Frequency and Surface Modification of the Alloy ZK60

Investigation of the mechanical and corrosion properties of Mg-Hydroxyapatite composite by addition of rare-earth oxide particulates for biomedical applications

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