Microstructure and mechanical properties of W-Ta and W-Ta-TiC alloys sintered by field assisted sintering technique

Paul N. Browning, Sunil Patankar, Anil Kamalakant Kulkarni, Lawrence Matson, Jogender Singh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Tungsten-tantalum alloys are of great interest due to the demand for high temperature ductile materials for nuclear and military applications. In the present study, the mechanical properties and microstructural evolution of W alloys with varying Ta and TiC concentrations were investigated. Base metal powders were blended using low-energy rotary ball milling and then sintered by the Field Assisted Sintering (FAST) technique. Mechanical properties were evaluated by four-point bend and Vicker's hardness testing, while microstructure was examined using optical and scanning electron microscopy paired with electron dispersive spectroscopy (EDS) analysis. Small TiC addition to pure tungsten alloys resulted in grain refinement and increased hardness and flexural strength. TiC added to W-Ta alloys was found to react with the TaOx present along the tantalum grain boundaries to produce regions of mixed TaCOx and TiOx phases in the interior of tantalum particles. Four point bend testing shows similar behavior between W, W-10%Ta, and W-10%Ta-5%TiC alloys, suggesting that the flexural mechanical behavior of Ta containing alloys is dominated by the tungsten matrix.

Original languageEnglish (US)
Title of host publicationAdvances in Powder Metallurgy and Particulate Materials - Proceedings of the 2015 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2015
PublisherMetal Powder Industries Federation
ISBN (Electronic)9781943694013
StatePublished - Jan 1 2015
Event2015 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2015 - San Diego, United States
Duration: May 17 2015May 20 2015

Other

Other2015 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2015
CountryUnited States
CitySan Diego
Period5/17/155/20/15

Fingerprint

Spark plasma sintering
sintering
mechanical properties
tungsten alloys
Tantalum
Tungsten alloys
Mechanical properties
microstructure
Microstructure
tantalum
Vickers hardness testing
tantalum alloys
Tantalum alloys
hardness
metal powder
Tungsten
Military applications
Vickers hardness
Powder metals
Grain refinement

All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Surfaces and Interfaces

Cite this

Browning, P. N., Patankar, S., Kulkarni, A. K., Matson, L., & Singh, J. (2015). Microstructure and mechanical properties of W-Ta and W-Ta-TiC alloys sintered by field assisted sintering technique. In Advances in Powder Metallurgy and Particulate Materials - Proceedings of the 2015 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2015 Metal Powder Industries Federation.
Browning, Paul N. ; Patankar, Sunil ; Kulkarni, Anil Kamalakant ; Matson, Lawrence ; Singh, Jogender. / Microstructure and mechanical properties of W-Ta and W-Ta-TiC alloys sintered by field assisted sintering technique. Advances in Powder Metallurgy and Particulate Materials - Proceedings of the 2015 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2015. Metal Powder Industries Federation, 2015.
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Browning, PN, Patankar, S, Kulkarni, AK, Matson, L & Singh, J 2015, Microstructure and mechanical properties of W-Ta and W-Ta-TiC alloys sintered by field assisted sintering technique. in Advances in Powder Metallurgy and Particulate Materials - Proceedings of the 2015 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2015. Metal Powder Industries Federation, 2015 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2015, San Diego, United States, 5/17/15.

Microstructure and mechanical properties of W-Ta and W-Ta-TiC alloys sintered by field assisted sintering technique. / Browning, Paul N.; Patankar, Sunil; Kulkarni, Anil Kamalakant; Matson, Lawrence; Singh, Jogender.

Advances in Powder Metallurgy and Particulate Materials - Proceedings of the 2015 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2015. Metal Powder Industries Federation, 2015.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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T1 - Microstructure and mechanical properties of W-Ta and W-Ta-TiC alloys sintered by field assisted sintering technique

AU - Browning, Paul N.

AU - Patankar, Sunil

AU - Kulkarni, Anil Kamalakant

AU - Matson, Lawrence

AU - Singh, Jogender

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Tungsten-tantalum alloys are of great interest due to the demand for high temperature ductile materials for nuclear and military applications. In the present study, the mechanical properties and microstructural evolution of W alloys with varying Ta and TiC concentrations were investigated. Base metal powders were blended using low-energy rotary ball milling and then sintered by the Field Assisted Sintering (FAST) technique. Mechanical properties were evaluated by four-point bend and Vicker's hardness testing, while microstructure was examined using optical and scanning electron microscopy paired with electron dispersive spectroscopy (EDS) analysis. Small TiC addition to pure tungsten alloys resulted in grain refinement and increased hardness and flexural strength. TiC added to W-Ta alloys was found to react with the TaOx present along the tantalum grain boundaries to produce regions of mixed TaCOx and TiOx phases in the interior of tantalum particles. Four point bend testing shows similar behavior between W, W-10%Ta, and W-10%Ta-5%TiC alloys, suggesting that the flexural mechanical behavior of Ta containing alloys is dominated by the tungsten matrix.

AB - Tungsten-tantalum alloys are of great interest due to the demand for high temperature ductile materials for nuclear and military applications. In the present study, the mechanical properties and microstructural evolution of W alloys with varying Ta and TiC concentrations were investigated. Base metal powders were blended using low-energy rotary ball milling and then sintered by the Field Assisted Sintering (FAST) technique. Mechanical properties were evaluated by four-point bend and Vicker's hardness testing, while microstructure was examined using optical and scanning electron microscopy paired with electron dispersive spectroscopy (EDS) analysis. Small TiC addition to pure tungsten alloys resulted in grain refinement and increased hardness and flexural strength. TiC added to W-Ta alloys was found to react with the TaOx present along the tantalum grain boundaries to produce regions of mixed TaCOx and TiOx phases in the interior of tantalum particles. Four point bend testing shows similar behavior between W, W-10%Ta, and W-10%Ta-5%TiC alloys, suggesting that the flexural mechanical behavior of Ta containing alloys is dominated by the tungsten matrix.

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M3 - Conference contribution

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PB - Metal Powder Industries Federation

ER -

Browning PN, Patankar S, Kulkarni AK, Matson L, Singh J. Microstructure and mechanical properties of W-Ta and W-Ta-TiC alloys sintered by field assisted sintering technique. In Advances in Powder Metallurgy and Particulate Materials - Proceedings of the 2015 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2015. Metal Powder Industries Federation. 2015