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Long Distance Roughness of Fracture Surfaces in Heterogeneous Materials

Published online by Cambridge University Press:  15 February 2011

M. Hinojosa ,
E. Bouchaud  and
B. Nghiem
M. Hinojosa
Affiliation:
Universidad Autónoma de Nuevo León, A.P. 149-F, S. Nicolás de los Garza, 66451México
E. Bouchaud
Affiliation:
Office Nationale D‘Études et de Recherches Aérospatiales (DMMP/MS), 29 Av. de la Division Leclerc, B.P. 72, F-92322 Châtillon Cedex, France
B. Nghiem
Affiliation:
Laboratoire CNRS/Saint Gobain, B.P. 135. 93303 Aubervilliers Cedex, France
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Abstract

The long distance roughness of fatigue fracture surfaces of a nickel-based superalloy is reported for two samples of different grain size. Statistical analysis over a wide range of length scales, from a few nanometers to a few millimeters, using scanning electron microscopy and atomic force microscopy allows to obtain accurately the self-affine correlation length. Long distance fracture profiles of 14,000 points were obtained and digitized from overlapping electron micrographs at a resolution of 0.22 micrometers/point. We have also analyzed the long distance roughness of the mirror zone on a soda-lime glass using atomic force microscopy. In the case of the nickel superalloy, correlation lengths are found to correspond well to the grain size. This result gives information about the mechanism of crack propagation in heterogeneous materials and shows that the correlation length of fracture surfaces is of the order of the largest microstructural heterogeneity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 539: Symposium M – Fracture & Ductile vs. Brittle Behavior - Theory, Modelling… , 1998 , 203
Copyright
Copyright © Materials Research Society 1999

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