Microstructure of the Nb-Si-B alloys in the Nb+T2 region

Soo Hyun Choo; Young Do Kim; Sung Tag Oh; Seong Lee; Sung Soo Ryu; Myung Jin Suk

doi:10.3365/KJMM.2014.53.1.43

Microstructure of the Nb-Si-B alloys in the Nb+T₂ region

Soo Hyun Choo, Young Do Kim, Sung Tag Oh, Seong Lee, Sung Soo Ryu, Myung Jin Suk

Dept. of Materials Science & Engineering

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

Abstract

Intermetallic-based materials are interesting for high temperature structural applications because of their good mechanical properties and enhanced oxidation resistance. In this study microstructural examination of the Nb-Si-B alloys at Nb-rich compositions was performed. The Nb-rich corner of the Nb-Si-B system is very attractive because the constituent phases are Nb (a ductile and tough phase with a high melting temperature) and T₂ (a very hard intermetallic compound with favorable oxidation resistance), which make a good combination for high temperature structural materials. At compositions lower than 82 at%Nb the microstructure shows the T₂ primary phase and eutectic (T₂+Nb), while the Nb primary phase and eutectic were formed at higher compositions. Hardness tests (Rockwell A-scale and micro Vickers) were carried out to estimate the optimal composition for good mechanical properties.

Original language	English
Pages (from-to)	43-50
Number of pages	8
Journal	Journal of Korean Institute of Metals and Materials
Volume	53
Issue number	1
DOIs	https://doi.org/10.3365/KJMM.2014.53.1.43
State	Published - 1 Jan 2015

Keywords

Hardness test
Intermetallics
Microstructure
Solidification
T phase

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10.3365/KJMM.2014.53.1.43

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title = "Microstructure of the Nb-Si-B alloys in the Nb+T2 region",

abstract = "Intermetallic-based materials are interesting for high temperature structural applications because of their good mechanical properties and enhanced oxidation resistance. In this study microstructural examination of the Nb-Si-B alloys at Nb-rich compositions was performed. The Nb-rich corner of the Nb-Si-B system is very attractive because the constituent phases are Nb (a ductile and tough phase with a high melting temperature) and T2 (a very hard intermetallic compound with favorable oxidation resistance), which make a good combination for high temperature structural materials. At compositions lower than 82 at\%Nb the microstructure shows the T2 primary phase and eutectic (T2+Nb), while the Nb primary phase and eutectic were formed at higher compositions. Hardness tests (Rockwell A-scale and micro Vickers) were carried out to estimate the optimal composition for good mechanical properties.",

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doi = "10.3365/KJMM.2014.53.1.43",

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AU - Choo, Soo Hyun

AU - Kim, Young Do

AU - Oh, Sung Tag

AU - Lee, Seong

AU - Ryu, Sung Soo

AU - Suk, Myung Jin

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Intermetallic-based materials are interesting for high temperature structural applications because of their good mechanical properties and enhanced oxidation resistance. In this study microstructural examination of the Nb-Si-B alloys at Nb-rich compositions was performed. The Nb-rich corner of the Nb-Si-B system is very attractive because the constituent phases are Nb (a ductile and tough phase with a high melting temperature) and T2 (a very hard intermetallic compound with favorable oxidation resistance), which make a good combination for high temperature structural materials. At compositions lower than 82 at%Nb the microstructure shows the T2 primary phase and eutectic (T2+Nb), while the Nb primary phase and eutectic were formed at higher compositions. Hardness tests (Rockwell A-scale and micro Vickers) were carried out to estimate the optimal composition for good mechanical properties.

AB - Intermetallic-based materials are interesting for high temperature structural applications because of their good mechanical properties and enhanced oxidation resistance. In this study microstructural examination of the Nb-Si-B alloys at Nb-rich compositions was performed. The Nb-rich corner of the Nb-Si-B system is very attractive because the constituent phases are Nb (a ductile and tough phase with a high melting temperature) and T2 (a very hard intermetallic compound with favorable oxidation resistance), which make a good combination for high temperature structural materials. At compositions lower than 82 at%Nb the microstructure shows the T2 primary phase and eutectic (T2+Nb), while the Nb primary phase and eutectic were formed at higher compositions. Hardness tests (Rockwell A-scale and micro Vickers) were carried out to estimate the optimal composition for good mechanical properties.

KW - Hardness test

KW - Intermetallics

KW - Microstructure

KW - Solidification

KW - T phase

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Microstructure of the Nb-Si-B alloys in the Nb+T₂ region

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Keywords

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