Influence of Fe content and particle size the on the processing and mechanical properties of low-cost Ti–xFe alloys

Esteban, P.G.; Ruiz-Navas, E.M.; Gordo, E.

doi:10.1016/j.msea.2010.05.026

Cited by 41 publications

(23 citation statements)

References 5 publications

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“…Ti-10V-2Fe-3Al (O ≤ 0.13; N ≤ 0.05; C ≤ 0.05; H ≤ 0.015; all in wt %), assigned formally as TIMETAL ® 10-2-3, has been realized for aircraft under-carriage applications [14,19]. Further experiments indicate that the enhancement in sinterability observed through the addition of fine iron powder (mean particle size = 8 µm) is not seen when working with coarser iron powder (mean particle size = 97 µm) [20].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution during Pressureless Sintering of Blended Elemental Ti-Al-V-Fe Titanium Alloys from Fine Hydrogenated-Dehydrogenated Titanium Powder

Cao

Jones

2017

Metals

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Abstract:A comprehensive study was conducted on microstructural evolution of sintered Ti-Al-V-Fe titanium alloys utilizing very fine hydrogenation-dehydrogenation (HDH) titanium powder with a median particle size of 8.84 µm. Both micropores (5-15 µm) and macropores (50-200 µm) were identified in sintered titanium alloys. Spherical micropores were observed in Ti-6Al-4V sintered with fine Ti at the lowest temperature of 1150 • C. The addition of iron can help reduce microporosity and improve microstructural and compositional homogenization. A theoretical calculation of evaporation based on the Miedema model and Langmuir equation indicates that the evaporation of aluminum could be responsible for the formation of the macropores. Although reasonable densification was achieved at low sintering temperatures (93-96% relative density) the samples had poor mechanical properties due mainly to the presence of the macroporosity and the high inherent oxygen content in the as-received fine powders.

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Section: Introductionmentioning

confidence: 99%

Microstructural Evolution during Pressureless Sintering of Blended Elemental Ti-Al-V-Fe Titanium Alloys from Fine Hydrogenated-Dehydrogenated Titanium Powder

Cao

Jones

2017

Metals

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“…In previous works, the authors have employed sintering temperatures ranging between 1250 and 1350 ºC, and times as long as 2 or 4 hours, to obtain densities of about 95% of theoretical [3,4,5]. As a consequence of the high temperature and prolonged times the grain size becomes coarse, the content of interstitial elements is high, and the final properties are lower than expected.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Ti Processing through Colloidal Techniques

Neves

Escribano

Ferrari

et al. 2012

KEM

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Abstract. The colloid-chemistry control of metallic powders in aqueous slurries is proposed as a way to prepare Ti powders with small particle size for a better pressing behavior through the spray dry process. The chemical-physic behavior of titanium powders with two different particle size distributions dispersed in water has been studied by measuring the zeta potential as a function of pH, and dispersant concentration. The employment of poly-acrylic dispersants allowed the fabrication of stable slurries with solid contents up to 50 vol% that have been sprayed under different conditions to form agglomerates ranging between 50 and 200 µm. Conditions were selected to achieve spherical agglomerates formed by a broad distribution of particle sizes that shown excellent flowability. Agglomerates were pressed in a uniaxial die to measure the compressibility, showing an improvement in pressing behavior with respect to powders with bigger particle size. The sintering behavior is also improved, as values of 96 % of the theoretical density were obtained for compacts sintered in vacuum at 1100 ºC for 30 minutes.

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“…A range of PM Ti-Fe alloys has thus been assessed. [9,[12][13][14][15][16][17] Chen et al [12] sintered Ti-3Fe, Ti-5Fe, and Ti-7Fe (pct) blends made from low oxygen (0.134 pct) fine Ti powder (25 lm) and Fe (3.4 lm) powder. Excellent properties were obtained from each alloy, particularly the as-sintered Ti-7Fe, which attained tensile properties similar to wrought Ti-6Al-4V.…”

Section: Introductionmentioning

confidence: 99%

“…However, the resulting mechanical properties of these alloys become much less attractive (the ductility drops from 13 pct to 2 pct for Ti-7Fe) when fabricated with HDH Ti powder containing (0.25 to 0.35) pct O. [13][14][15][16][17] Silicon is another inexpensive alloying element and is much lighter (2.33 g/cm 3 ) than Ti. Small additions of Si have been used in several commercial Ti alloys by the ingot metallurgy approach to improve their resistance to creep and oxidation.…”

Section: Introductionmentioning

confidence: 99%

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The Sintering, Sintered Microstructure and Mechanical Properties of Ti-Fe-Si Alloys

Yang

Luo

Schaffer

et al. 2012

Metall Mater Trans A

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A systematic study has been conducted of the sintering, sintered microstructure and tensile properties of a range of lower cost Ti-Fe-Si alloys, including Ti-3Fe-(0-4)Si, Ti-(3-6)Fe-0.5Si, and Ti-(3-6)Fe-1Si (in wt pct throughout). Small additions of Si (£1 pct) noticeably improve the as-sintered tensile properties of Ti-3Fe alloy, including the ductility, with fine titanium silicides (Ti 5 Si 3 ) being dispersed in both the a and b phases. Conversely, additions of >1 pct Si produce coarse and/or networked Ti 5 Si 3 silicides along the grain boundaries leading to predominantly intergranular fracture and, hence, poor ductility, although the tensile strength continues to increase because of the reinforcement by Ti 5 Si 3 . Increasing the Fe content in the Ti-xFe-0.5/ 1.0Si alloys above 3 pct markedly increases the average grain size and changes the morphology of the a-phase phase to much thinner and more acicular laths. Consequently, the ductility drops to <1 pct. Si reacts exothermically with Fe to form Fe-Si compounds prior to the complete diffusion of the Fe into the Ti matrix during heating. The heat thus released in conjunction with the continuous external heat input melts the silicides leading to transient liquid formation, which improves the densification during heating. No Ti-TiFe eutectoid was observed in the as-sintered Ti-Fe-Si alloys. The optimum PM Ti-Fe-Si compositions are determined to be Ti-3Fe-(0.5-1.0)Si.

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Influence of Fe content and particle size the on the processing and mechanical properties of low-cost Ti–xFe alloys

Cited by 41 publications

References 5 publications

Microstructural Evolution during Pressureless Sintering of Blended Elemental Ti-Al-V-Fe Titanium Alloys from Fine Hydrogenated-Dehydrogenated Titanium Powder

Microstructural Evolution during Pressureless Sintering of Blended Elemental Ti-Al-V-Fe Titanium Alloys from Fine Hydrogenated-Dehydrogenated Titanium Powder

Improvement of Ti Processing through Colloidal Techniques

The Sintering, Sintered Microstructure and Mechanical Properties of Ti-Fe-Si Alloys

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