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Practical and Fundamental Studies of Nanocrystalline Composite Thin Films

Published online by Cambridge University Press:  21 February 2011

Yang-Tse Cheng ,
Boqin Qiu ,
Simon Tung ,
J. P. Blanchard  and
G. Drew
Yang-Tse Cheng
Affiliation:
General Motors R&D Center, Warren, Michigan 48090–9055
Boqin Qiu
Affiliation:
The University of Wisconsin, Madison, Wisconsin 53706
Simon Tung
Affiliation:
General Motors R&D Center, Warren, Michigan 48090–9055
J. P. Blanchard
Affiliation:
The University of Wisconsin, Madison, Wisconsin 53706
G. Drew
Affiliation:
Packard Electric Division, General Motors, Warren, Ohio 44486
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Abstract

Nanocrytslline composite films of Ag-Mo and Ag-Ni have been made by a co-deposition technique in UHV. The structure and composition have been studied by x-ray diffraction (XRD), transmission electron microscopy (TEM), and electron probe microanalysis (EPMA). For practical applications, the friction coefficient and wear rate were measured using a pin-on-plate machine for Ag-Mo composites deposited on steel. For fundamental studies, the hardness of the Ag-Ni composites deposited on oxidized Si wafers was measured using a nanoindenter. Experiments show that (1) reduction of friction and wear rate can be achieved using these nanocomposite coatings and (2) the hardness of the nanocomposites depends on the grain size. As the grain size of the Ag decreases from 100 to 10 nm, the hardness increases about 4 times.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 356: Symposium B2 – Thin Films: Stresses and Mechanical Properties V , 1994 , 875
Copyright
Copyright © Materials Research Society 1995

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