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Fracture Toughness, Fracture Planes and BDT in Stoichiometric Feal and Nial Single Crystals

Published online by Cambridge University Press:  22 February 2011

Petra Specht ,
Markus Brede  and
Peter Neumann
Petra Specht
Affiliation:
MPI fuer Eisenforschung GmbH, 40237 Duesseldorf, Germany
Markus Brede
Affiliation:
Fraunhofer Institut IF AM, 28717 Bremen, Germany
Peter Neumann
Affiliation:
MPI fuer Eisenforschung GmbH, 40237 Duesseldorf, Germany
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Abstract

Fracture toughness data of stoichiometric FeAl and NiAl single crystals were measured in four-point-bending tests and the crystallographic orientations of the resultant fracture surfaces were determined.

For FeAl single crystals unexpectedly high fracture toughness values were measured even at low temperatures (17 MPa [001] at 77K). However, these crystals failed in a brittle manner for temperatures up to 300K. The crystallographic orientation of the fracture surfaces were strongly dependent on the environment due to hydrogen embrittlement.

The NiAl specimens were precracked and the fracture toughness was measured in the weakest crystal orientation. The fracture surfaces were similar to those obtained in previous investigations. Although the room temperature (RT) KIC-value was the highest for pure weak-oriented NiAl (7.5 MPa [001]) the BDT temperature was found in the same region where it occurs for the hard orientation (673K to 693K). The onset of the BDT will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 207
Copyright
Copyright © Materials Research Society 1995

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