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The Fracture Toughness of a Brittle Nickel Silicide Containing the Ductile Phases Ni(Si) and Ni3Si

Published online by Cambridge University Press:  01 January 1992

Zhaohui Li  and
Erland M. Schulson
Zhaohui Li
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
Erland M. Schulson
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
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Abstract

The fracture toughness at room temperature of a brittle nickel silicide containing the ductile phases Ni(Si) and Ni3Si has been investigated. The microstructure was comprised of a brittle nickel silicide matrix, ductile Ni(Si) particles distributed within the matrix, and Ni3Si rims around the particles. It was obtained by annealing hot-extruded Ni-23 at.%Si (with and without 0.19 at.% boron) at 1100°C and then air cooling. The fracture toughness values were in the range of 13 MPa m1/2 to 22 MPa m1/2. Systematic effects of annealing time and of boron were not apparent. It would appear that the incorporation of the ductile particles has a beneficial effect on the fracture toughness of an otherwise brittle silicide.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 1081
Copyright
Copyright © Materials Research Society 1995

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References

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