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Fracture Toughness of Two Cr2Hf+Cr Intermetallic Composites as a Function Temperature

Published online by Cambridge University Press:  15 February 2011

K. S. Ravichandran ,
D. B. Miracle  and
M. G. Mendiratta
K. S. Ravichandran
Affiliation:
UES, Inc., 4401 Dayton-Xenia Road, Dayton, OH 45432-1894
D. B. Miracle
Affiliation:
WL/MLLM, Materials Directorate, Wright Patterson AFB, OH 45433
M. G. Mendiratta
Affiliation:
UES, Inc., 4401 Dayton-Xenia Road, Dayton, OH 45432-1894
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Abstract

Fracture toughness as a function of temperature was evaluated for two Cr2Hf+Cr intermetallic composites, each in two different microstructural conditions. The proeutectic microstructures based on Cr-6.5Hf (at%) showed a significant increase in fracture toughness with an increase from room temperature to 600°C. The coarse microstructure obtained by heat treatment at 1500°C showed evidence of ductile behavior of Cr at a lower test temperature (200°C) relative to that of one heat treated at 1250°C (400'C). In the eutectic microstructures based on Cr-13Hf, only a small increase in fracture toughness at 600°C was seen. The results are analyzed in the light of fracture micromechanisms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 249
Copyright
Copyright © Materials Research Society 1994

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