Anisotropy of ultrafine-grained alloys under impact loading: The case of biomedical niobium–zirconium

Toker, Sıdıka Mine; Rubitschek, F.; Niendorf, Т.; Canadinç, D.; Maier, Hans Jürgen

doi:10.1016/j.scriptamat.2011.12.007

Cited by 17 publications

(12 citation statements)

References 22 publications

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“…[10][11][12] Moreover, despite this significant increase in strength, the ductility remains nearly the same, which provides a desirable strength-ductility combination for many applications. The impact experiments, on the other hand, revealed that both the CG and UFG samples underwent a ductileto-brittle transition as the temperature decreases from 50°C to À100°C, and exhibited a typical impact behavior 13 (Table II; the data were recompiled from Ref. 13.…”

Section: Resultsmentioning

confidence: 99%

“…The impact experiments, on the other hand, revealed that both the CG and UFG samples underwent a ductileto-brittle transition as the temperature decreases from 50°C to À100°C, and exhibited a typical impact behavior 13 (Table II; the data were recompiled from Ref. 13. The readers are referred to Ref.…”

Section: Resultsmentioning

confidence: 99%

“…The readers are referred to Ref. 13 for the graphical representation). In the case of UFG NbZr, the transition from the ductile-to-brittle region is more obvious, and higher energy absorption is noted (Table II), implying that this UFG variant is more susceptible to temperature changes and exhibits ductile failure.…”

Section: Resultsmentioning

confidence: 99%

“…[7][8][9] Recent works on this material have demonstrated that an excellent combination of mechanical properties, high strength, and good fatigue resistance can be obtained in NbZr alloys upon introduction of an ultrafine-grained (UFG) microstructure. [10][11][12][13] For implant materials, in addition to resistance against corrosion induced by the chemically aggressive human body environment, mechanical performance related parameters, such as high strength, improved fatigue resistance, and fracture toughness, are also important, especially considering loading conditions that can sometimes become intense. [14][15][16][17] For instance, sudden impact loads prompted by falling, jumping, or other causes may lead to serious injuries and bone fractures in various body parts, such as hip or knee joints, [18][19][20][21][22] or dental implants.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure-based modeling of the impact response of a biomedical niobium–zirconium alloy

et al. 2014

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This article presents a new multiscale modeling approach proposed to predict the impact response of a biomedical niobium-zirconium alloy by incorporating both geometric and microstructural aspects. Specifically, the roles of both anisotropy and geometry-based distribution of stresses and strains upon loading were successfully taken into account by incorporating a proper multiaxial material flow rule obtained from crystal plasticity simulations into the finite element (FE) analysis. The simulation results demonstrate that the current approach, which defines a hardening rule based on the location-dependent equivalent stresses and strains, yields more reliable results as compared with the classical FE approach, where the hardening rule is based on the experimental uniaxial deformation response of the material. This emphasizes the need for proper coupling of crystal plasticity and FE analysis for the sake of reliable predictions, and the approach presented herein constitutes an efficient guideline for the design process of dental and orthopedic implants that are subject to impact loading in service.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure-based modeling of the impact response of a biomedical niobium–zirconium alloy

et al. 2014

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“…Furthermore, they showed that the fracture toughness depends strongly on crack orientations machined from the HPT disk. Toker et al [5] indicated the significant effect of anisotropy on the impact toughness of UFG niobium-zirconium alloys processed by equal-channel angular extrusion. We [3,6,7] developed stronger, tougher steel, i.e., fail-safe steel, by a microstructural design based on heterogeneity that was lacking in the traditional concept.…”

Section: Introductionmentioning

confidence: 99%

Effect of initial notch orientation on fracture toughness in fail-safe steel

Inoue

Kimura

2012

J Mater Sci

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A 0.4C-2Si-1Cr-1Mo steel bar with an ultrafine-elongated grain (UFEG) structures was produced by multi-pass warm caliber rolling. The test sample was machined from the rolled bar with 0°, 45°, and 90°rotation along the rolling direction, and a static three-point bending test was conducted at ambient temperature. The toughness anisotropy on the steel with UFEG structures were studied, including the crack propagation on the basis of the microstructural features. The strength and toughness decreased with an increase in the rotation angle along the rolling direction. The toughness decreased drastically, compared to the strength. The notch orientation dependence on toughness is due to differences in the spatial distribution of weak sites such as {100} cleavage planes and boundaries of elongated grains. For the toughness design in ultrafine-grained materials, it is essential to understand the spatial distribution of these weak sites as well as the grain size.

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Investigations of Microstructure and Mechanical Properties in Wire + Arc Additively Manufactured Niobium–Zirconium Alloy

et al. 2023

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Herein, the feasibility of the gas tungsten arc welding‐based wire + arc additive manufacturing process for fabricating thin wall structures of niobium‐1 wt% zirconium (NbZr1) alloy is investigated. Three different heat input conditions (low, medium, and high) have been selected for fabricating it. The microstructure is characterized by using optical microscopy, scanning electron microscopy, X‐ray diffraction, energy‐dispersive spectroscopy, and electron backscattered diffraction (EBSD). The microstructure shows the columnar dendritic structure elongated in the build direction. No cracks or porosity are observed in the structure. Average Vickers hardness for low, medium, and high heat input conditions are 146.6, 162.1, and 163.5 HV, respectively. There is an increasing trend of microhardness value along the deposition height, which can be attributed to the difference in secondary dendritic arm spacing and the formation of precipitates. The tensile strength of the specimen is comparable to the conventional and additively manufactured structures. EBSD analysis confirms that possible subgrains are responsible for good mechanical properties at room temperature. In the majority of the tensile samples, the failure mechanism has been identified as a ductile fracture. The mechanical characteristics fluctuate with locations in each of the thin walls, suggesting anisotropy in the deposits.

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Anisotropy of ultrafine-grained alloys under impact loading: The case of biomedical niobium–zirconium

Cited by 17 publications

References 22 publications

Microstructure-based modeling of the impact response of a biomedical niobium–zirconium alloy

Microstructure-based modeling of the impact response of a biomedical niobium–zirconium alloy

Effect of initial notch orientation on fracture toughness in fail-safe steel

Investigations of Microstructure and Mechanical Properties in Wire + Arc Additively Manufactured Niobium–Zirconium Alloy

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