Unidirectional solidification of a Nbss/Nb5Si 3 in-situ composite

X. P. Guo; P. Guan; X. Ding; J. Zhang; K. Kusabiraki; H. Z. Fu

doi:10.4028/0-87849-960-1.745

Unidirectional solidification of a Nb_ss/Nb₅Si ₃ in-situ composite

X. P. Guo, P. Guan, X. Ding, J. Zhang, K. Kusabiraki, H. Z. Fu

School of Materials Sience and Engineering

Research output: Contribution to journal › Conference article › peer-review

21 Scopus citations

Abstract

The directionally solidified specimens of Nb-13.52 Si-22.60 Ti-6.88 Hf-2.54 Cr-2.24 Al alloy were prepared in an electron beam floating zone melting furnace at the withdrawing rate of 0.1, 0.3, 0.6, 1.0, 2.4 and 6.0 mm/min. All the primary Nb solid solution (Nb_ss) columns, Nb_ss + (Nb)₃Si/(Nb)₅Si₃ eutectic colonies and divorced (Nb)₃Si/(Nb)₅Si₃ plates or chains align well along the longitudinal axis of the specimens. With increasing of the withdrawing rate, the microstructure is gradually refined, and the amount of Nb _ss + (Nb)₃Si/(Nb)₅Si₃ eutectic colonies increases. Both the room temperature ultimate tensile strength σ_b and fracture toughness K_Q are improved for the directionally solidified specimens. The tensile fracture occurs in a cleavage way.

Original language	English
Pages (from-to)	745-748
Number of pages	4
Journal	Materials Science Forum
Volume	475-479
Issue number	I
DOIs	https://doi.org/10.4028/0-87849-960-1.745
State	Published - 2005
Event	PRICM 5: The Fifth Pacific Rim International Conference on Advanced Materials and Processing - Beijing, China Duration: 2 Nov 2004 → 5 Nov 2004

Keywords

Eutectic in-situ composites
Mechanical properties
Microstructural evolution
Niobium suicide
Ultrahigh temperature alloy
Unidirectional solidification

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.4028/0-87849-960-1.745

Cite this

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title = "Unidirectional solidification of a Nbss/Nb5Si 3 in-situ composite",

abstract = "The directionally solidified specimens of Nb-13.52 Si-22.60 Ti-6.88 Hf-2.54 Cr-2.24 Al alloy were prepared in an electron beam floating zone melting furnace at the withdrawing rate of 0.1, 0.3, 0.6, 1.0, 2.4 and 6.0 mm/min. All the primary Nb solid solution (Nbss) columns, Nbss + (Nb)3Si/(Nb)5Si3 eutectic colonies and divorced (Nb)3Si/(Nb)5Si3 plates or chains align well along the longitudinal axis of the specimens. With increasing of the withdrawing rate, the microstructure is gradually refined, and the amount of Nb ss + (Nb)3Si/(Nb)5Si3 eutectic colonies increases. Both the room temperature ultimate tensile strength σb and fracture toughness KQ are improved for the directionally solidified specimens. The tensile fracture occurs in a cleavage way.",

keywords = "Eutectic in-situ composites, Mechanical properties, Microstructural evolution, Niobium suicide, Ultrahigh temperature alloy, Unidirectional solidification",

author = "Guo, {X. P.} and P. Guan and X. Ding and J. Zhang and K. Kusabiraki and Fu, {H. Z.}",

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AU - Guo, X. P.

AU - Guan, P.

AU - Ding, X.

AU - Zhang, J.

AU - Kusabiraki, K.

AU - Fu, H. Z.

PY - 2005

Y1 - 2005

N2 - The directionally solidified specimens of Nb-13.52 Si-22.60 Ti-6.88 Hf-2.54 Cr-2.24 Al alloy were prepared in an electron beam floating zone melting furnace at the withdrawing rate of 0.1, 0.3, 0.6, 1.0, 2.4 and 6.0 mm/min. All the primary Nb solid solution (Nbss) columns, Nbss + (Nb)3Si/(Nb)5Si3 eutectic colonies and divorced (Nb)3Si/(Nb)5Si3 plates or chains align well along the longitudinal axis of the specimens. With increasing of the withdrawing rate, the microstructure is gradually refined, and the amount of Nb ss + (Nb)3Si/(Nb)5Si3 eutectic colonies increases. Both the room temperature ultimate tensile strength σb and fracture toughness KQ are improved for the directionally solidified specimens. The tensile fracture occurs in a cleavage way.

AB - The directionally solidified specimens of Nb-13.52 Si-22.60 Ti-6.88 Hf-2.54 Cr-2.24 Al alloy were prepared in an electron beam floating zone melting furnace at the withdrawing rate of 0.1, 0.3, 0.6, 1.0, 2.4 and 6.0 mm/min. All the primary Nb solid solution (Nbss) columns, Nbss + (Nb)3Si/(Nb)5Si3 eutectic colonies and divorced (Nb)3Si/(Nb)5Si3 plates or chains align well along the longitudinal axis of the specimens. With increasing of the withdrawing rate, the microstructure is gradually refined, and the amount of Nb ss + (Nb)3Si/(Nb)5Si3 eutectic colonies increases. Both the room temperature ultimate tensile strength σb and fracture toughness KQ are improved for the directionally solidified specimens. The tensile fracture occurs in a cleavage way.

KW - Eutectic in-situ composites

KW - Mechanical properties

KW - Microstructural evolution

KW - Niobium suicide

KW - Ultrahigh temperature alloy

KW - Unidirectional solidification

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