Microstructures and mechanical properties of directionally solidified multi-element Nb-Si alloy

Qiang Huang; Xi Ping Guo; Yong Wang Kang; Jin Xia Song; Shi Yu Qu; Ya Fang Han

doi:10.1016/S1002-0071(12)60048-3

Microstructures and mechanical properties of directionally solidified multi-element Nb-Si alloy

Qiang Huang, Xi Ping Guo, Yong Wang Kang, Jin Xia Song, Shi Yu Qu, Ya Fang Han

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Nb-Si system in-situ composites with nominal composition of Nb-21Ti-16Si-7Cr-3Al-2Hf (mole fraction, %) were prepared by directional solidification technology in an optical floating zone furnace at the growth rates of 3, 5, 8 and 12mm/h. The microstructures and mechanical properties were investigated as a function of the growth rate. The results show that the solidification microstructures consist of Nb solid solution (Nbss), α-Nb₅Si₃ and β-Nb₅Si₃. Silicides with high aspect ratio grow continuously and straightly when the growth rate is 5mm/h; lower or higher growth rates are disadvantageous for the formation of favorable directional microstructures. The compressive strength at 1 250 °C and room-temperature fracture toughness of the specimen with the growth rate of 5mm/h that exhibits excellent mechanical properties are 415 MPa and 22.4MPa·m^1/2, respectively.

Original language	English
Pages (from-to)	146-152
Number of pages	7
Journal	Progress in Natural Science: Materials International
Volume	21
Issue number	2
DOIs	https://doi.org/10.1016/S1002-0071(12)60048-3
State	Published - Apr 2011

Keywords

Directional solidification
Mechanical property
Microstructure
Nb-Si system in-situ composite

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10.1016/S1002-0071(12)60048-3

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title = "Microstructures and mechanical properties of directionally solidified multi-element Nb-Si alloy",

abstract = "Nb-Si system in-situ composites with nominal composition of Nb-21Ti-16Si-7Cr-3Al-2Hf (mole fraction, %) were prepared by directional solidification technology in an optical floating zone furnace at the growth rates of 3, 5, 8 and 12mm/h. The microstructures and mechanical properties were investigated as a function of the growth rate. The results show that the solidification microstructures consist of Nb solid solution (Nbss), α-Nb5Si3 and β-Nb5Si3. Silicides with high aspect ratio grow continuously and straightly when the growth rate is 5mm/h; lower or higher growth rates are disadvantageous for the formation of favorable directional microstructures. The compressive strength at 1 250 °C and room-temperature fracture toughness of the specimen with the growth rate of 5mm/h that exhibits excellent mechanical properties are 415 MPa and 22.4MPa·m1/2, respectively.",

keywords = "Directional solidification, Mechanical property, Microstructure, Nb-Si system in-situ composite",

author = "Qiang Huang and Guo, {Xi Ping} and Kang, {Yong Wang} and Song, {Jin Xia} and Qu, {Shi Yu} and Han, {Ya Fang}",

year = "2011",

month = apr,

doi = "10.1016/S1002-0071(12)60048-3",

language = "英语",

volume = "21",

pages = "146--152",

journal = "Progress in Natural Science: Materials International",

issn = "1002-0071",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Microstructures and mechanical properties of directionally solidified multi-element Nb-Si alloy

AU - Huang, Qiang

AU - Guo, Xi Ping

AU - Kang, Yong Wang

AU - Song, Jin Xia

AU - Qu, Shi Yu

AU - Han, Ya Fang

PY - 2011/4

Y1 - 2011/4

N2 - Nb-Si system in-situ composites with nominal composition of Nb-21Ti-16Si-7Cr-3Al-2Hf (mole fraction, %) were prepared by directional solidification technology in an optical floating zone furnace at the growth rates of 3, 5, 8 and 12mm/h. The microstructures and mechanical properties were investigated as a function of the growth rate. The results show that the solidification microstructures consist of Nb solid solution (Nbss), α-Nb5Si3 and β-Nb5Si3. Silicides with high aspect ratio grow continuously and straightly when the growth rate is 5mm/h; lower or higher growth rates are disadvantageous for the formation of favorable directional microstructures. The compressive strength at 1 250 °C and room-temperature fracture toughness of the specimen with the growth rate of 5mm/h that exhibits excellent mechanical properties are 415 MPa and 22.4MPa·m1/2, respectively.

AB - Nb-Si system in-situ composites with nominal composition of Nb-21Ti-16Si-7Cr-3Al-2Hf (mole fraction, %) were prepared by directional solidification technology in an optical floating zone furnace at the growth rates of 3, 5, 8 and 12mm/h. The microstructures and mechanical properties were investigated as a function of the growth rate. The results show that the solidification microstructures consist of Nb solid solution (Nbss), α-Nb5Si3 and β-Nb5Si3. Silicides with high aspect ratio grow continuously and straightly when the growth rate is 5mm/h; lower or higher growth rates are disadvantageous for the formation of favorable directional microstructures. The compressive strength at 1 250 °C and room-temperature fracture toughness of the specimen with the growth rate of 5mm/h that exhibits excellent mechanical properties are 415 MPa and 22.4MPa·m1/2, respectively.

KW - Directional solidification

KW - Mechanical property

KW - Microstructure

KW - Nb-Si system in-situ composite

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U2 - 10.1016/S1002-0071(12)60048-3

DO - 10.1016/S1002-0071(12)60048-3

M3 - 文章

AN - SCOPUS:84861961339

SN - 1002-0071

VL - 21

SP - 146

EP - 152

JO - Progress in Natural Science: Materials International

JF - Progress in Natural Science: Materials International

IS - 2

ER -

Microstructures and mechanical properties of directionally solidified multi-element Nb-Si alloy

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Keywords

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