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In-Situ TEM Phase Formation in Cold Rolled Aluminum-Nickel Multilayers

Published online by Cambridge University Press:  10 February 2011

H. Sieber  and
J. H. Perepezko
H. Sieber
Affiliation:
University of Wisconsin - Madison, Department of Materials Science and Engineering, 1509 University Avenue, Madison, WI 53706, USA, [email protected]
J. H. Perepezko
Affiliation:
University of Wisconsin - Madison, Department of Materials Science and Engineering, 1509 University Avenue, Madison, WI 53706, USA, [email protected]
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Abstract

Multilayer samples of Nickel and Aluminum with an overall composition of Al-20Ni were prepared by cold rolling of elemental foils. The sample microstructures and phases were characterized by XRD, SEM and TEM/SAED, and the reactive phase formation was then examined by DSC measurements. XRD, SEM and TEM measurements show that the rolling procedure results in a decrease of the Al and Ni layer thicknesses (down to 100 nm in average) and a decrease of the grain size (down to less than 50 nm). No phase formation is observed during the cold rolling procedure. In isochronal DSC scans of the Al-Ni multilayers, the formation of the Al3Ni phase was found to be a two step reaction process due to 2-dimensional nucleation and lateral growth and a 3-dimensional phase thickening. While XRD measurements showed Al3Ni as the only phase that forms, more detailed TEM investigations of the samples after DSC treatment also showed a small amount of an amorphous Al-Ni phase, formed by a thermally activated solid state amorphization reaction (SSAR). In-situ TEM heating of the amorphous areas under the electron beam in the microscope yielded the crystallization of the amorphous phase to a B2 structure and a growth of the B2 grains up to 100 nm in size.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 539
Copyright
Copyright © Materials Research Society 1998

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