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In Situ Examination of moving Crack Tips in Ordered Intermetallics

Published online by Cambridge University Press:  15 February 2011

J.K. Heuer ,
N.Q. Lam ,
P.R. Okamoto  and
J.F. Stubbins
J.K. Heuer
Affiliation:
Department of Nuclear Engineering, University of Illinois, Urbana, IL 61801 Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
N.Q. Lam
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
P.R. Okamoto
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
J.F. Stubbins
Affiliation:
Department of Nuclear Engineering, University of Illinois, Urbana, IL 61801
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Abstract

Recent studies have shown that high stress concentrations at moving crack tips in the intermetallic compound NiTi can induce a crystalline-to-amorphous (C-A) transformation of the crack tip region. This stress-induced C-A transformation has a temperature dependence and crystallization behavior similar to those of ion irradiation-induced C-A transformation of NiTi. The present study examines if these similarities between stress- and irradiation-induced amorphization hold true for two other intermetallic compounds, CuTi and Ni3Ti. In situ straining was performed in an intermediate-voltage transmission electron microscope. The presence or absence of an amorphous phase was determined by dark field imaging and selected area diffraction of crack tip regions. Crack tips in both CuTi and Ni3Ti were found to remain crystalline upon fracture. The observed absence of stress-induced amorphization in Ni3Ti is consistent with its known absence during irradiation, but the absence in CuTi differs from its known irradiation-induced amorphization behavior. Reasons for the similarity and difference are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 539: Symposium M – Fracture & Ductile vs. Brittle Behavior - Theory, Modelling… , 1998 , 29
Copyright
Copyright © Materials Research Society 1999

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