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Crystal-to-amorphous transformation of NiTi induced by cold rolling

Published online by Cambridge University Press:  31 January 2011

J. Koike ,
D. M. Parkin  and
M. Nastasi
J. Koike
Affiliation:
Center for Materials Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
D. M. Parkin
Affiliation:
Center for Materials Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
M. Nastasi
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

A NiTi intermetallic compound was cold rolled at room temperature by 30% and 60% thickness reductions, and microstructures were studied by means of transmission electron microscopy (TEM). In the cold-rolled samples we observed both a phase of nanometer-sized crystals and an amorphous phase. A substantially high dislocation density, 1013 to 1014/cm2, was evident in the transition region between crystalline and amorphous phases. A simple estimate of the elastic energy arising from this dislocation density is of the same order as the crystallization energy, suggesting that dislocation accumulation is a major driving force for amorphization in cold-rolled NiTi.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 7 , July 1990 , pp. 1414 - 1418
Copyright
Copyright © Materials Research Society 1990

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