Processing a biocompatible Ti–35Nb–7Zr–5Ta alloy by selective laser melting

Batalha, Rodolfo Lisboa; Batalha, Weverson Capute; Deng, Liang; Gustmann, Tobias; Pauly, S.; Kiminami, Cláudio Shyinti; Gargarella, Piter

doi:10.1557/jmr.2020.90

Cited by 33 publications

(14 citation statements)

References 36 publications

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“…7c), which is the building direction of the sample. The transversal and longitudinal linear intercept lengths, L t = 72 µm and L l = 327 µm, confirm the columnar morphology of the grains in the as-built TNZT sample, as also shown in our previous work [36]. This is related to…”

Section: Phase Constitution and Microstructural Characterizationsupporting

confidence: 90%

“…Melt pools are clearly observed in Fig. 4a due to microsegregations at the melt pool boundaries, as reported in our previous work [36].…”

Section: Phase Constitution and Microstructural Characterizationsupporting

confidence: 87%

“…Gas-atomized Ti-35Nb-7Zr-5Ta (wt%, TNZT) powder (Ercata GmbH, d 50 = 32.5 µm, for more details about the particle size distribution, please refer to Batalha et al [36]) and TiB 2 powder (Abcr GmbH, d 50 = 4 µm) were used to produce rods with 3 mm in diameter and 10 mm of the height of TNZT and TNZT with 1 wt% TiB 2 (TNZT-TiB 2 ) by laser-powder bed fusion (L-PBF). The blend was obtained by mixing the two powders using a drum hoop mixer (JEL RRM Mini-II, J. Engelsmann AG) for 35 min at a speed of 25 rpm.…”

Section: Samples Preparationmentioning

confidence: 99%

“…The additively manufactured samples were prepared in a Realizer SLM 50, equipped with a fiber-laser (maximum laser power of 129 W, λ = 1070 nm and spot size of 60 µm). This work is based on the optimized L-PBF parameters we have established for the present TNZT powder in a previous publication: laser power of 129 W, scanning speed of 0.57 m s −1 , layer thickness of 40 μm and 110 μm of hatching distance, resulting in an energy input of 58.3 J mm −3 [36].…”

Section: Samples Preparationmentioning

confidence: 99%

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Microstructure and properties of TiB2-reinforced Ti–35Nb–7Zr–5Ta processed by laser-powder bed fusion

Batalha

Pinotti

Alnoaimy

et al. 2021

Journal of Materials Research

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The Ti–35Nb–7Zr–5Ta (wt%, TNZT) alloy was reinforced with TiB2 and synthesized by L-PBF. The relatively small TiB2 particles change the solidification structure from cellular to columnar-dendritic and lead to submicron TiB precipitation in the β matrix. This results in pronounced grain refinement and reduction of texture. However, the microstructure of the additively manufactured TNZT-TiB2 is still different from the as-cast, unreinforced TNZT, which contains equiaxed and randomly oriented grains. The β phase is less stable in the as-cast samples, leading to stress-induced martensitic transformation and recoverable strain of 1.5%. The TNZT with 1 wt% of TiB2 presents significantly higher compressive strength (σYS = 495 MPa) compared to unreinforced samples (σYS = 430 MPa), without sacrificing ductility or altering Young’s modulus (E ≈ 46 GPa). The addition of a small fraction of TiB2 to the TNZT alloy synthesized by L-PBF is a promising alternative for manufacturing sophisticated components for biomedical applications. Graphical abstract

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Section: Phase Constitution and Microstructural Characterizationsupporting

confidence: 90%

“…Melt pools are clearly observed in Fig. 4a due to microsegregations at the melt pool boundaries, as reported in our previous work [36].…”

Section: Phase Constitution and Microstructural Characterizationsupporting

confidence: 87%

Section: Samples Preparationmentioning

confidence: 99%

Section: Samples Preparationmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure and properties of TiB2-reinforced Ti–35Nb–7Zr–5Ta processed by laser-powder bed fusion

Batalha

Pinotti

Alnoaimy

et al. 2021

Journal of Materials Research

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“…As a first result, it was observed that all samples showed excellent ductility under compression and no fracture occurred with strains up to 60%. The Young's modulus and yield strength were compared to results reported in previous works for the TNZT alloy [20,31] and to a β-Ti-24Nb-4Zr-8Sn alloy produced by L-PBF [32].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Effect of scanning strategy on microstructure and mechanical properties of a biocompatible Ti–35Nb–7Zr–5Ta alloy processed by laser-powder bed fusion

Batalha

Kosiba

et al. 2022

Journal of Materials Research

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The influence of scanning strategy (SS) on microstructure and mechanical properties of a Ti–35Nb–7Zr–5Ta alloy processed by laser-powder bed fusion (L-PBF) is investigated for the first time. Three SSs are considered: unidirectional-Y; bi-directional with 79° rotation (R79); and chessboard (CHB). The SSs affect the type and distribution of pores. The highest relative densities and more homogeneous distribution of pores are obtained with R79 and CHB scanning strategies, whereas aligned pores are formed in the unidirectional-Y. The SSs show direct influence on the crystallographic texture with unidirectional-Y strategy showing fiber texture. The R79 strategy results in a weak texture and the CHB scanning strategy forms a randomly oriented heterogeneous grain structure. The lowest Young modulus is obtained with the unidirectional-Y strategy, whereas the R79 strategy results in the highest yield strength. It is shown that the SSs may be used for tuning the microstructure of a beta-Ti alloy in L-PBF. Graphical abstract

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Electrical impedance characterization and modelling of Ti‐Β implants

Navarro,

Barrera,

Olmo

et al. 2024

J Biomedical Materials Res

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Commercially pure titanium (c.p. Ti) and Ti6Al4V alloys are the most widely used metallic biomaterials in the biomedical sector. However, their high rigidity and the controversial toxicity of their alloying elements often compromise their clinical success. The use of porous β‐Titanium alloys is proposed as a solution to these issues. In this regard, it is necessary to implement economic, repetitive, and non‐destructive measurement techniques that allow for the semi‐quantitative evaluation of the chemical nature of the implant, its microstructural characteristics, and/or surface changes. This study proposes the use of simple measurement protocols based on electrical impedance measurements, correlating them with the porosity inherent to processing conditions (pressure and temperature), as well as the chemical composition of the implant. Results revealed a clear direct relationship between porosity and electrical impedance. The percentage and/or size of the porosity decrease with an increase in compaction pressure and temperature. Moreover, there is a notable influence of the frequency used in the measurements obtained. Additionally, the sensitivity of this measurement technique has enabled the evaluation of differences in chemical composition and the detection of intermetallics in the implants. For the first time in the literature, this research establishes relationships between stiffness and electrical impedance, using approximations and models for the observed trends. All the results obtained corroborate the appropriateness of the technique to achieve the real‐time characterization of Titanium implants, in an efficient and non‐invasive way.

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Processing a biocompatible Ti–35Nb–7Zr–5Ta alloy by selective laser melting

Abstract: Abstract

Cited by 33 publications

References 36 publications

Microstructure and properties of TiB2-reinforced Ti–35Nb–7Zr–5Ta processed by laser-powder bed fusion

Microstructure and properties of TiB2-reinforced Ti–35Nb–7Zr–5Ta processed by laser-powder bed fusion

Effect of scanning strategy on microstructure and mechanical properties of a biocompatible Ti–35Nb–7Zr–5Ta alloy processed by laser-powder bed fusion

Electrical impedance characterization and modelling of Ti‐Β implants

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