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Effect of R-Curve and Inhomogeneities on the Toughness Measurement of Metallic Glasses

Published online by Cambridge University Press:  21 February 2011

W. Henning ,
M. Calvo  and
F. Osterstock
W. Henning
Affiliation:
Institut für Werkstoffkunde und WerkstofftechnikTechnische Universität Clausthal, D-3392 Clausthal-Zellerfeld, FRG
M. Calvo
Affiliation:
on leave from Equipe Matériaux-Microstructure du L. A. 251 ISMRA-Université, F-14032 Caen Cedex, France
F. Osterstock
Affiliation:
on leave from Equipe Matériaux-Microstructure du L. A. 251 ISMRA-Université, F-14032 Caen Cedex, France
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Abstract

Sub-critical crack growth is a function of the degree of relaxation of the amorphous structure and has implications regarding the measurement of annealing embrittlement and the dependence of embrittlement on temperature. The variation of Kc with annealing time is strongly dependent on the size of the initial crack length. Quenched-in inhomogeneities seem to be always present. Their effect depends on the specific testing conditions, especially the testing temperature because the ductile-brittle transition is a function of the degree of relaxation of the amorphous structure. Some doubt is also cast on the accepted assumption that a chevron pattern is representative of plane strain crack propagation conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 28: Symposium F – Rapidly Solidified Metastable Materials , 1983 , 203
Copyright
Copyright © Materials Research Society 1984

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References

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