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Studying Mechanical Properties Of Thin Films Under High Pressures

Published online by Cambridge University Press:  16 February 2011

B. C. Cai ,
D. Kuhlmann-Wilsdorf  and
R. B. Nelson
B. C. Cai
Affiliation:
On temporary leave from Jiao Tong University, Shanghai, P. R. of China
D. Kuhlmann-Wilsdorf
Affiliation:
University of Virginia, Dept. of Materials Science, Charlottesville, VA 22901
R. B. Nelson
Affiliation:
University of Virginia, Dept. of Materials Science, Charlottesville, VA 22901
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Abstract

Work-hardening curves of aluminum foils and of stacks of O.1μm thick 22 ct. gold foils, deformed between rotating Bridgman anvils, have been obtained for pressures up to 1533 MPa and shear strains to 400,000%. No sample thickness effect has been found between 5μm and 3μm, nor any significant difference between homogeneous foils and multi-layer foils, but heat-treatments do affect the results, as apparently does the introduction of 50nm thick sputtered copper layers between stacks of gold foils. Increases of strength with pressure appear to be due to corresponding increases of the Peierls-Nabarro stress. X-ray evidence indicates the reorientation of the foils from an initial (001) recrystallization texture after rolling to the (111) texture that was to be expected. Ordinary deformation behavior is indicated throughout, except for a tendency for slight negative work-hardening in the lower pressure range. At the extreme, assuming homogeneous deformation, the foils thinned to 60nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 188: Symposium K – Thin Films: Stresses and Mechanical Properties II , 1990 , 183
Copyright
Copyright © Materials Research Society 1990

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References

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