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Phase Equilibria and Oxidation Behavior of C40 Disilicides in the Nb-Cr-Si System

Published online by Cambridge University Press:  02 February 2015

Nobuaki Sekido ,
Ryoma Aizawa  and
Shunkichi Ueno
Nobuaki Sekido
Affiliation:
National Institute for Materials Science, Tsukuba 305-0047, Japan
Ryoma Aizawa
Affiliation:
College of Engineering, Nippon University, Koriyama 963-8642, Japan
Shunkichi Ueno
Affiliation:
College of Engineering, Nippon University, Koriyama 963-8642, Japan
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Abstract

The phase equilibrium and oxidation behavior of the disilicides that form in the Nb-Cr-Si ternary system have been investigated. Although NbSi2 and CrSi2 both exhibit a C40 crystal structure, they form separate ranges of compositional homogeneity in the ternary system. Their phase boundaries at 1300 °C have been experimentally determined in this study. The binary NbSi2 exhibited poor oxidation resistance, showing pest-like behavior during oxidation at temperature above 800 °C. In contrast, the alloys containing Cr showed much better oxidation resistance up to 1200 °C.

Keywords

Nboxidationphase equilibria
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy05-04
Copyright
Copyright © Materials Research Society 2015 

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References

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