Fracture toughness and high temperature strength of unidirectionally solidified Nb-Si binary and Nb-Ti-Si ternary alloys

Nobuaki Sekido; Yoshisato Kimura; Seiji Miura; Fu Gao Wei; Yoshinao Mishima

doi:10.1016/j.jallcom.2006.01.071

Fracture toughness and high temperature strength of unidirectionally solidified Nb-Si binary and Nb-Ti-Si ternary alloys

Nobuaki Sekido, Yoshisato Kimura, Seiji Miura, Fu Gao Wei, Yoshinao Mishima

研究成果: Article › 査読

125 被引用数 (Scopus)

抄録

The (Nb)/Nb₃Si eutectic alloys in the Nb-Si binary and Nb-Ti-Si ternary systems were unidirectionally solidified in an optical floating zone melting furnace. The effect of solidification rates on microstructures of the alloys is investigated. The coupled growth of (Nb) and Nb₃Si is observed in the binary alloy solidified at 10 mm/h. The ternary alloys exhibit the development of discontinuous (Nb) particles within the Nb₃Si matrix. The unidirectionally solidified alloys show improved fracture toughness and enhanced high temperature compressive strength as compared with the arc-melted counterparts. The role of an aligned eutectic microstructure in toughening is discussed from the existing models based on the crack bridging and the crack deflection.

本文言語	English
ページ（範囲）	223-229
ページ数	7
ジャーナル	Journal of Alloys and Compounds
巻	425
号	1-2
DOI	https://doi.org/10.1016/j.jallcom.2006.01.071
出版ステータス	Published - 2006 11 30
外部発表	はい

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

文献へのアクセス

10.1016/j.jallcom.2006.01.071

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引用スタイル

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title = "Fracture toughness and high temperature strength of unidirectionally solidified Nb-Si binary and Nb-Ti-Si ternary alloys",

abstract = "The (Nb)/Nb3Si eutectic alloys in the Nb-Si binary and Nb-Ti-Si ternary systems were unidirectionally solidified in an optical floating zone melting furnace. The effect of solidification rates on microstructures of the alloys is investigated. The coupled growth of (Nb) and Nb3Si is observed in the binary alloy solidified at 10 mm/h. The ternary alloys exhibit the development of discontinuous (Nb) particles within the Nb3Si matrix. The unidirectionally solidified alloys show improved fracture toughness and enhanced high temperature compressive strength as compared with the arc-melted counterparts. The role of an aligned eutectic microstructure in toughening is discussed from the existing models based on the crack bridging and the crack deflection.",

keywords = "Intermetallics, Scanning electron microscopy, Strain, Unidirectional solidification",

author = "Nobuaki Sekido and Yoshisato Kimura and Seiji Miura and Wei, {Fu Gao} and Yoshinao Mishima",

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AU - Sekido, Nobuaki

AU - Kimura, Yoshisato

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AU - Wei, Fu Gao

AU - Mishima, Yoshinao

PY - 2006/11/30

Y1 - 2006/11/30

N2 - The (Nb)/Nb3Si eutectic alloys in the Nb-Si binary and Nb-Ti-Si ternary systems were unidirectionally solidified in an optical floating zone melting furnace. The effect of solidification rates on microstructures of the alloys is investigated. The coupled growth of (Nb) and Nb3Si is observed in the binary alloy solidified at 10 mm/h. The ternary alloys exhibit the development of discontinuous (Nb) particles within the Nb3Si matrix. The unidirectionally solidified alloys show improved fracture toughness and enhanced high temperature compressive strength as compared with the arc-melted counterparts. The role of an aligned eutectic microstructure in toughening is discussed from the existing models based on the crack bridging and the crack deflection.

AB - The (Nb)/Nb3Si eutectic alloys in the Nb-Si binary and Nb-Ti-Si ternary systems were unidirectionally solidified in an optical floating zone melting furnace. The effect of solidification rates on microstructures of the alloys is investigated. The coupled growth of (Nb) and Nb3Si is observed in the binary alloy solidified at 10 mm/h. The ternary alloys exhibit the development of discontinuous (Nb) particles within the Nb3Si matrix. The unidirectionally solidified alloys show improved fracture toughness and enhanced high temperature compressive strength as compared with the arc-melted counterparts. The role of an aligned eutectic microstructure in toughening is discussed from the existing models based on the crack bridging and the crack deflection.

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KW - Scanning electron microscopy

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