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Microstructure Control of Nb-Si Based Alloys with Cr, W, Ta and Zr by Using Nb3Si Phase Stability Control

Published online by Cambridge University Press:  23 January 2013

Yuting WANG ,
Seiji MIURA  and
Akira YOSHINARI
Yuting WANG
Affiliation:
Materials Research Centre, Hitachi Research Laboratory, 1-1, Omika-cho 7-chome, Hitachi, Ibaraki, 319-1292, Japan
Seiji MIURA
Affiliation:
Faculty of Engineering, Hokkaido University, N13 W8, Sapporo, Hokkaido, 060-8628, Japan
Akira YOSHINARI
Affiliation:
Materials Research Centre, Hitachi Research Laboratory, 1-1, Omika-cho 7-chome, Hitachi, Ibaraki, 319-1292, Japan
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Abstract

Recently, Nb-Si based alloys have attracted considerable attention as potential candidate materials for ultra-high temperature applications, because of their low densities and high melting points. However, it is still very difficult to obtain materials with a good balance of high-temperature strength and room-temperature toughness. To address this issue, microstructure control is considered to be a promising method. In applying microstructure control to Nb-Si based alloys with a eutectic reaction (L → Nbss + Nb3Si) and a eutectoid reaction (Nb3Si → Nbss + Nb5Si3), the key is the control of Nb3Si phase stability. Nbss (Nb solid solution) is considered as a ductile phase. In previous reports, it was revealed that different elements had different effects on the stability of Nb3Si. In particular, Mo and W (>3 at %) destabilize the Nb3Si phase, while Ti and Ta stabilize it, and Zr acts as an accelerator for decomposition of Nb3Si. On the other hand, Cr is known to enhance the formation of the ductile Nbss phase. In the present study, we investigated the effects of adding combinations of stabilizing, destabilizing, and accelerating elements with Cr, such as Cr and W, Cr and Ta, Cr and Zr. According to SEM observation, different microstructures were obtained with different combination of additives, and the fracture toughness at room temperature of these samples were also evaluated to reveal the effects of the microstructure on the mechanical properties of Nb-Si based alloys.

Keywords

microstructureNbtoughness
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 109 - 114
Copyright
Copyright © Materials Research Society 2013 

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References

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