Processing, microstructure, and mechanical properties of (Nb)/Nb5Si3 two-phase Alloys

Yoshisato Kimura; Hiroaki Yamaoka; Nobuaki Sekido; Yoshinao Mishima

doi:10.1007/s11661-005-0161-9

Processing, microstructure, and mechanical properties of (Nb)/Nb₅Si₃ two-phase Alloys

Yoshisato Kimura, Hiroaki Yamaoka, Nobuaki Sekido, Yoshinao Mishima

Research output: Contribution to journal › Article

27 Citations (Scopus)

Abstract

It has been shown that a fine lamellar structure composed of Nb solid solution, (Nb), and Nb₅Si₃ is formed through eutectoid decomposition in the Nb-Si binary system and its ternary derivatives. Such alloys would exhibit a high strength at over 1400 K, yet showing room-temperature toughness of over 10 to 20 MPa m^1/2 if a proper lamellar spacing is chosen. In the present work, effects of processing on the microstructure evolution and mechanical properties are investigated on the Nb-18 at. pct Si alloys prepared by hot pressing (HP) and spark-plasma sintering (SPS). The powders used in the present work are of pure Nb and Nb₅Si₃ in order for the fabrication to become possible at temperatures higher than the melting point of Si and to reduce the formation of SiO₂. The results show that the SPS yields more uniform two-phase microstructure but the alloy fabricated through HP tends to provide higher elevated temperature strength.

Original language	English
Pages (from-to)	483-488
Number of pages	6
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	36
Issue number	3
DOIs	https://doi.org/10.1007/s11661-005-0161-9
Publication status	Published - 2005 Mar
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys

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Kimura, Y., Yamaoka, H., Sekido, N., & Mishima, Y. (2005). Processing, microstructure, and mechanical properties of (Nb)/Nb₅Si₃ two-phase Alloys. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 36(3), 483-488. https://doi.org/10.1007/s11661-005-0161-9

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abstract = "It has been shown that a fine lamellar structure composed of Nb solid solution, (Nb), and Nb5Si3 is formed through eutectoid decomposition in the Nb-Si binary system and its ternary derivatives. Such alloys would exhibit a high strength at over 1400 K, yet showing room-temperature toughness of over 10 to 20 MPa m1/2 if a proper lamellar spacing is chosen. In the present work, effects of processing on the microstructure evolution and mechanical properties are investigated on the Nb-18 at. pct Si alloys prepared by hot pressing (HP) and spark-plasma sintering (SPS). The powders used in the present work are of pure Nb and Nb5Si3 in order for the fabrication to become possible at temperatures higher than the melting point of Si and to reduce the formation of SiO2. The results show that the SPS yields more uniform two-phase microstructure but the alloy fabricated through HP tends to provide higher elevated temperature strength.",

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