Microstructure and lattice parameters of suction-cast Ti–Nb alloys in a wide range of Nb concentrations

Thoemmes, Alexander; Батаев, И. А.; Lazurenko, Daria V.; Ruktuev, Alexey A.; Иванов, И. А.; Afonso, Conrado Ramos Moreira; Stark, Andreas; Jorge, Alberto Moreira

doi:10.1016/j.msea.2021.141378

Cited by 23 publications

(13 citation statements)

References 53 publications

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“…The lattice parameter calculated from XRD pattern is a = 0.3289 ± 0.0001 nm. This value is consistent with the single BCC β phase Ti42Nb alloy parameter [33,35,36]. The peaks of the α martensitic phase, which are possibly developed during the rapid cooling, are not observed in the XRD spectrum.…”

Section: Microstructural Characterization Of the As-lb-pbfed Ti42nb M...supporting

confidence: 86%

Impact of the Loading Conditions and the Building Directions on the Mechanical Behavior of Biomedical β-Titanium Alloy Produced In Situ by Laser-Based Powder Bed Fusion

et al. 2022

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In order to simulate micromachining of Ti-Nb medical devices produced in situ by selective laser melting, it is necessary to use constitutive models that allow one to reproduce accurately the material behavior under extreme loading conditions. The identification of these models is often performed using experimental tension or compression data. In this work, compression tests are conducted to investigate the impact of the loading conditions and the laser-based powder bed fusion (LB-PBF) building directions on the mechanical behavior of β-Ti42Nb alloy. Compression tests are performed under two strain rates (1 s−1 and 10 s−1) and four temperatures (298 K, 673 K, 873 K and 1073 K). Two LB-PBF building directions are used for manufacturing the compression specimens. Therefore, different metallographic analyses (i.e., optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), electron backscatter diffraction (EBSD) and X-ray diffraction) have been carried out on the deformed specimens to gain insight into the impact of the loading conditions on microstucture alterations. According to the results, whatever the loading conditions are, specimens manufactured with a building direction of 45∘ exhibit higher flow stress than those produced with a building direction of 90∘, highlighting the anisotropy of the as-LB-PBFed alloy. Additionally, the deformed alloy exhibits at room temperature a yielding strength of 1180 ± 40 MPa and a micro-hardness of 310 ± 7 HV0.1. Experimental observations demonstrated two strain localization modes: a highly deformed region corresponding to the localization of the plastic deformation in the central region of specimens and perpendicular to the compression direction and an adiabatic shear band oriented with an angle of ±45 with respect to same direction.

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Section: Microstructural Characterization Of the As-lb-pbfed Ti42nb M...supporting

confidence: 86%

Impact of the Loading Conditions and the Building Directions on the Mechanical Behavior of Biomedical β-Titanium Alloy Produced In Situ by Laser-Based Powder Bed Fusion

et al. 2022

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“…Alloy with 16 wt% Nb is a stable β alloy as it contains a single β phase, Nb wt% less than 16 in this system is a metastable alloy as 14 wt% Nb alloy composed of β, α′′, and ω phases. The addition of 2 wt% Fe to Ti–Nb strongly enhances β phase stability because, in the case of Ti–Nb binary alloys, the β phase becomes stable after 32.5 wt% Nb, as reported by Thoemmes et al 157 Due to the precipitation of the ω phase, 14 wt% Nb alloy exhibited high strength. Elastic modulus and strength decreased as the Nb content increased because of high β phase stability.…”

Section: Effect Of Alloy Composition On Mechanical Properties and Pha...supporting

confidence: 54%

“…The lower Nb content leads to β to α ′ phase transformation, moderate Nb content leads to β to α ′′ phase transformation, and at higher Nb content, a complete β phase or β + ω phase mixture is formed. 157 Han et al investigated the effect of Nb composition of 5 to 20 wt% in Ti-Nb binary system and heat-treated in α + β field. All alloys have α and β phases.…”

Section: Effect Of Nbmentioning

confidence: 99%

A review on β-Ti alloys for biomedical applications: The influence of alloy composition and thermomechanical processing on mechanical properties, phase composition, and microstructure

Kanapaakala

Sathesh

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Titanium and its alloys are potential materials for orthopedic implant applications due to their appropriate biological and mechanical behavior. As biocompatibility and biomechanical compatibilities are essential parameters for determining a biomedical implant's performance and service life, this research review article discussed the novel Ti alloys with nontoxic and biocompatible alloying elements with an elastic modulus similar to the bone. Among Ti alloys, β-Ti alloys are appropriate for load-bearing implant applications due to lower elastic modulus and nontoxic elements, including Ti, Ta, Nb, Zr, Sn, and Mo. Even though the β-Ti alloys possess a lesser elastic modulus compared to other metallic biomaterials, two issues associated with β-Ti alloys that result in implant failure are that they still possess a higher elastic modulus than human bone and they have insufficient strength. Alloy composition and thermomechanical processing characteristics play a vital role in altering the mechanical properties and microstructure of β-Ti alloys. Hence, this review article emphasizes the alloying and thermomechanical processing effects on the mechanical properties and microstructure of β-Ti alloys.

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“…Figure 1 the typical microstructure of the as-cast alloy following etching. The microstructure can be characterized by coarse NiAl matrix grains almost surrounded by the luminous white Mo phases, and the left ones are inlaid within the cell or at the middle of the unit cell composed of tiny particles because of the coherent relationship, which was mentioned in previous work [26]. Each phase's volume fraction in the eutectic fulfils the given Eq.…”

Section: Resultsmentioning

confidence: 63%

“…1a, the rod-shaped Mo phases expand radially perpendicular to the NiAl cell boundaries. According to anterior studies [26,27], it seemed that mechanical rearrangement proceeded at the cell boundary. The core of the unit cell generated spherical Mo phases throughout the preparation procedure, which was reported earlier.…”

Section: Depictsmentioning

confidence: 99%

Optimizing microstructure and mechanical properties of NiAl-9Mo alloy by Zr addition and suction casting process

Li¹,

Zhu²,

Qi³

et al. 2022

kovmat

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In the present work, NiAl-9Mo alloys with different addition of Zr were prepared by water--cooled copper mold and suction casting, respectively, and the influence on the microstructure and properties of the alloys was discussed. The results show that the microstructure of the as-cast NiAl-9Mo-xZr (x = 0.5, 1.0, 1.5) alloys is a typical eutectic cell structure, with Ni2AlZr (Heusler) phases discontinuously distributed in the cell boundaries. The eutectic cells of NiAl--9Mo-1Zr alloy prepared by the suction casting process are refined, and the average eutectic lamella thickness is about 3 µm. The microhardness of the suction-cast NiAl-9Mo-1Zr alloy is 630.0 HV, which is higher than that of the as-cast alloy (396 HV). The high-temperature compressive strength of the as-cast NiAl-9Mo-1Zr alloy is higher than that of the as-cast alloy, which reaches 350 MPa at 1273 K, due to the joint action of fine grain strengthening and the second phase strengthening of the Heusler phase.

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Microstructure and lattice parameters of suction-cast Ti–Nb alloys in a wide range of Nb concentrations

Cited by 23 publications

References 53 publications

Impact of the Loading Conditions and the Building Directions on the Mechanical Behavior of Biomedical β-Titanium Alloy Produced In Situ by Laser-Based Powder Bed Fusion

Impact of the Loading Conditions and the Building Directions on the Mechanical Behavior of Biomedical β-Titanium Alloy Produced In Situ by Laser-Based Powder Bed Fusion

A review on β-Ti alloys for biomedical applications: The influence of alloy composition and thermomechanical processing on mechanical properties, phase composition, and microstructure

Optimizing microstructure and mechanical properties of NiAl-9Mo alloy by Zr addition and suction casting process

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