Microstructure of a Ti–50 wt% Ta alloy produced via laser powder bed fusion

Xing, Leilei; Chen, Zhao; Chen, Hao; Shen, Zhijian; Liu, Wei

doi:10.1007/s40195-020-01052-w

Cited by 15 publications

(13 citation statements)

References 39 publications

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“…However, achieving the complex geometries of aerospace components or the required efficiency for customized bio-implants for humans is difficult using conventional subtractive methods. Additive manufacturing (AM) technique, which allows layer-by-layer building of complex functional parts designed in a 3D model, shows great promise in the construction of aerospace components and medical devices [2][3][4]. Electron beam melting (EBM) is one of the powder bed AM techniques that utilize electron beam as heating source and has been extensively studied for Ti64 alloy [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Orientation Dependence of the Micro-Pillar Compression Strength in an Electron Beam Melted Ti–6Al–4V Alloy

Tian

Yan

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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An α/β two-phase Ti-6Al-4V alloy was fabricated by electron beam melting to obtain a basketweave structure. The orientation dependence of the mechanical properties of Ti-6Al-4V alloy was studied by micro-pillar compression and post-mortem transmission electron microscopy analysis. The results indicate that different grains have different mechanical responses, and the possible attributions were discussed. Besides the orientation effect, due to the limited volumes of micropillars, the size of the α phases, dispersion of the β phases, and the presence of the free dislocation path also affect the mechanical properties of the micropillars to a large extent. Although no direct link was discovered between the mechanical properties and the parent β orientations, this work provided a promising method to further study the anisotropic mechanical behavior in Ti-6Al-4V alloy.

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Section: Introductionmentioning

confidence: 99%

Orientation Dependence of the Micro-Pillar Compression Strength in an Electron Beam Melted Ti–6Al–4V Alloy

Tian

Yan

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…The laser energy density was inversely proportional to v . Under the same P , h, and d , the lower scanning speed caused higher energy density and vice versa [ 27 ]. The scanning speed used for S1 was the lowest among all samples.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, as for refractory metals, the cost of AM process is much lower than the multiple remelting processes [ 24 ]. Many researchers have studied the metallurgy technology of Ti with various refractory elements using laser powder bed fusion (LPBF) technology in recent years [ 25 , 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

“…The amount of energy had a great influence on the distribution of the elements and the types of phases in samples. A large number of Ta particles were distributed in the matrix with low input energy density [ 27 ]. The unmelted Ta particles in the Ti-Ta alloy had an impact on mechanical properties, which were studied previously [ 28 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Microstructure and Mechanical Properties of the Ti-Ta Alloy with Unmelted Ta Particles by Laser Powder Bed Fusion

Gao

Cui

et al. 2023

Materials

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Titanium-tantalum (Ti-Ta) alloy has excellent biomechanical properties with high strength and low Young’s modulus, showing great application potential in the biomedical industry. In this study, Ti-Ta alloy samples were prepared by laser powder bed fusion (LPBF) technology with mixed pure 75 wt.% Ti and 25 wt.% Ta powders as the feedstock. The maximum relative density of Ti-Ta samples prepared by LPBF reached 99.9%. It is well-accepted that four nonequilibrium phases, namely, α′, α″ and metastable β phase exist in Ti-Ta alloys. The structure of α′, α″ and β are hexagonal close-packed (HCP), base-centered orthorhombic (BCO) and body-centered cubic (BCC), respectively. X-ray Diffraction (XRD) analysis showed that the α′ phase transformed to the α″ phase with the increase of energy density. The lamellar α′/α″ phases and the α″ twins were generated in the prior β phase. The microstructure and mechanical properties of the Ti-Ta alloy were optimized with different LPBF processing parameters. The samples prepared by LPBF energy density of 381 J/mm3 had a favorable ultimate strength (UTS) of 1076 ± 2 MPa and yield strength of 795 ± 16 MPa. The samples prepared by LPBF energy density of 76 had excellent ductility, with an elongation of 31% at fracture.

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“…Some metastable phases can be obtained under various heat treatment [12,13], such as casting, welding, or rapid heating/cooling [3,12,14]. The martensitic phases α , α", ω, and phases α n and β n ("n" stands for nonequilibrium composition) are metastable phases in Ti alloys that are formed due to hardening [4,12,13,15]. A metastable phase with a face-centered cubic (fcc) crystal structure has been reported by several authors in pure Ti and Ti-based alloys [16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Face-Centered Cubic Ti Alloys Transformation by X-ray Diffraction Profile Analysis in Mechanical Alloying

Pio

Medína

Martínez

et al. 2021

Metals

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Four titanium alloys (Ti-Ta, Ti-Ta-Sn, Ti-Ta-Mn, and Ti-Nb-Sn) were synthesized by mechanical alloying (MA) in a planetary mill in different times between 2 h and 100 h. The microstructure characterization was made by X-ray diffraction (XRD), in which the Rietveld method was applied to analyze the diffraction patterns. The study demonstrated that after short milling times between 2 h and 30 h, the fraction of hexagonal close-packed (hcp) phase decreases; at the same time, the formation of body-centered cubic (bcc) and face-centered cubic (fcc) Ti phases are promoted. Additionally, after 30 h of MA, the full transformation of hcp-Ti was observed, and the bcc-Ti to fcc-Ti phase transformation took place until 50 h. The results suggest that the addition of Ta and Sn promotes the fcc-Ti phase formation, obtaining 100% of this phase at 50 h onwards, whereas Nb and Mn show the opposite effect.

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Microstructure of a Ti–50 wt% Ta alloy produced via laser powder bed fusion

Cited by 15 publications

References 39 publications

Orientation Dependence of the Micro-Pillar Compression Strength in an Electron Beam Melted Ti–6Al–4V Alloy

Orientation Dependence of the Micro-Pillar Compression Strength in an Electron Beam Melted Ti–6Al–4V Alloy

Investigation on the Microstructure and Mechanical Properties of the Ti-Ta Alloy with Unmelted Ta Particles by Laser Powder Bed Fusion

Evolution of Face-Centered Cubic Ti Alloys Transformation by X-ray Diffraction Profile Analysis in Mechanical Alloying

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