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Fracture and Toughness of Intermetallics

Published online by Cambridge University Press:  01 January 1992

Horst Vehoff
Horst Vehoff*
Affiliation:
MPI für Eisenforschung, Max Planck Str. 1, D-4000 Düsseldorf, Germany
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Abstract

The difficulties to obtain valid fracture toughness values in brittle intermetallics are discussed. Different intermetallic alloys with the same specimen size were tested in four point bending to allow the direct comparison of the bnttleness of different alloys. The influence ofgrain size, phase distribution, and temperature on the fracture toughness was measured. The fracture toughness of many intermetallic alloys was found to be extremely rate sensitive. This is discussed in view of dynamic models of the brittle/ductile transition developed recently. NiAl single crystals with <100>-specimen axis snowed the largest toughness at room temperature and compared to other orientations the highest transition temperature. The apparent activation energy for the brittle%ductile transition depends on orientation. Evidence was given that in multiphase alloys the yielding of a second phase initiates interfacial fracture. For polycrystals it was shown that different processes can cause brittle/ductile transitions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 71
Copyright
Copyright © Materials Research Society 1995

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