PM processing and characterisation of Ti–7Fe low cost titanium alloys

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

doi:10.1179/174329009x457063

Cited by 69 publications

(49 citation statements)

References 26 publications

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“…Algunos desarrollos pulvimetalúrgicos se han orientado a la disminución de costes de las aleaciones, mediante la introducción de elementos de aleación de bajo coste, como el hierro y sustituyendo el vanadio de las composiciones [66][67][68][69] . El diseño de aleaciones de bajo coste, orientadas a la diversificación del uso del titanio, puede contribuir a potenciar la introducción del titanio en industrias convencionales, donde el elevado precio de las aleaciones y procesos de fabricación actuales, vetan su empleo.…”

Section: Comparación Del Procesado C O N V E N C I O N a L C O N E L unclassified

Introducción al procesado pulvimetalúrgico del titanio

Esteban¹,

Bolzoni²,

Ruiz-Navas³

et al. 2011

REVMETAL

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ResumenEl desarrollo de las nuevas tecnologías de extracción de titanio, que producen titanio elemental directamente en forma de polvo, sitúan a la pulvimetalurgia en un puesto estratégico para la fabricación de componentes de titanio. La disminución de coste del material base, junto a la economía de los procesos pulvimetalúrgicos, hacen más viable la diversificación de la industria del titanio, lo que permitiría alcanzar volúmenes de producción capaces de popularizar el metal y estabilizar su precio. En este trabajo se muestran algunas de las técnicas pulvimetalúrgicas empleadas para la fabricación de componentes de titanio a partir de los dos enfoques clásicos de mezcla de polvos elementales y el uso de polvos prealeados. Se describen entre otras las técnicas de prensado y sinterización convencional o compactación isostática en frío y caliente, que tratan de competir con las técnicas de procesado convencional, y se muestran algunas aplicaciones actuales y potenciales. Palabras claveTitanio; Pulvimetalurgia; Procesado del titanio.

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Section: Comparación Del Procesado C O N V E N C I O N a L C O N E L unclassified

Introducción al procesado pulvimetalúrgico del titanio

Esteban¹,

Bolzoni²,

Ruiz-Navas³

et al. 2011

REVMETAL

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“…This temperature is lower than the temperature at which Fe completely diffuses into the Ti particles. At a heating rate of 5 K/min, Fe particles of 97 lm in the powder compacts of Ti-7Fe exist up to 1363 K (1090°C), [16] whereas Fe particles of 19 lm do not disappear until 1298 K (1025°C) in the powder compacts of Ti-5Fe. [9] The reactions between Fe and Si are exothermic.…”

Section: A Mechanism Of Enhanced Sintering By Simentioning

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%

“…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%

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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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“…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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PM processing and characterisation of Ti–7Fe low cost titanium alloys

Cited by 69 publications

References 26 publications

Introducción al procesado pulvimetalúrgico del titanio

Introducción al procesado pulvimetalúrgico del titanio

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

Improvement of Ti Processing through Colloidal Techniques

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