Design of powder metallurgy titanium alloys and composites

Liu, Yong; Chen, L. F.; Tang, Hanchun; Liu, Chang; Liu, B.; Huang, Baiyun

doi:10.1016/j.msea.2005.10.057

Cited by 274 publications

(138 citation statements)

References 22 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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“…The sinterability of titanium alloys can be enhanced by the addition of iron since the mobility of titanium atoms is accelerated by the rapid diffusion of iron [13,17,18]. The fast diffusion of iron in titanium alloy is evidenced by the fact that iron is essentially uniform in a blended elemental Ti-10V-2Fe-3Al alloy when heated at 5 • C/min to 1200 • C [19].…”

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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“…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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Design of powder metallurgy titanium alloys and composites

Cited by 274 publications

References 22 publications

Introducción al procesado pulvimetalúrgico del titanio

Introducción al procesado pulvimetalúrgico del titanio

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

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

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