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Deformation-Induced Amorphization of Crystalline Particles in a Cu-Ti Metallic Glass

Published online by Cambridge University Press:  26 February 2011

Eduardo A. Kamenetzky ,
Philip D. Asikenazy ,
Lee E. Tanner  and
William L. Johnson
Eduardo A. Kamenetzky
Affiliation:
Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720
Philip D. Asikenazy
Affiliation:
W. M. Keck Laboratory of Engineering Materials, California Insitute of Technology, Pasadena, CA 91125
Lee E. Tanner
Affiliation:
Chemistry and Materials Science Department, Lawrence Livermore National Laboratory, Livermore, CA 94550
William L. Johnson
Affiliation:
W. M. Keck Laboratory of Engineering Materials, California Insitute of Technology, Pasadena, CA 91125
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Abstract

Crystalline particles and grains embedded in Cu35Ti65 glass ribbons have been amorphized by isothermal cold rolling. The structural evolution has been studied by X-ray diffraction and TEM techniques. Initial particle morphologies are spherulitic and spherical, the latter with sizes ranging between 10 and 100 nm. The new amorphous phase seems to nucleate at crystalline-amorphous matrix interfaces. Initially there is a well defined interface between the new and the existing amorphous phases but it disappears as rolling progresses. Crystallites on a nanoscale still present in the final stages of particle amorphization have been observed by convergent beam electron diffraction. After sufficient deformation the consolidated ribbon becomes completely glassy. A morphological description of the transformation process in terms of crystal destabilization and solid-state particle melting is presented.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 80: Symposium G – Science and Technology of Rapidly Quenched Alloys , 1986 , 83
Copyright
Copyright © Materials Research Society 1987

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