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The Segregation of Boron and Its Effect on the Fracture of An Ni3Si Based Alloy

Published online by Cambridge University Press:  28 February 2011

W. C. Oliver  and
C. L. White
W. C. Oliver
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
C. L. White
Affiliation:
Department of Metallurgical Engineering, Michigan Technological University, Houghton, MI 49931
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Abstract

It is now well established that microalloying additions of B to Ni3Al drastically reduce low temperature grain boundary fracture and consequently increase the ductility of this intermetallic compound. One possible explanation for such effects involves the relationship between boron segregation to grain boundaries and free surfaces, and the resulting effect of such segregation on the cohesive energy of the grain boundaries. This study involves the extension of these concepts to an alloy based on Ni3Si. Auger spectroscopy has been carried out on fractured grain boundaries, grain interiors, and free surfaces to determine how B segregates in Ni3(Si,Ti). The consequences of the segregation of B on the cohesive energy of grain boundaries in Ni3Si based alloys are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 241
Copyright
Copyright © Materials Research Society 1987

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References

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