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Determination of Time-Dependent Plastic Properties of Metals by Indentation Load Relaxation Techniques

Published online by Cambridge University Press:  22 February 2011

Simo-Pekka Hannula ,
Donald Stone  and
Che-Yu Li
Simo-Pekka Hannula
Affiliation:
Department of Materials Science and Engineering Cornell University, Bard Hall, Ithaca, NY 14853
Donald Stone
Affiliation:
Department of Materials Science and Engineering Cornell University, Bard Hall, Ithaca, NY 14853
Che-Yu Li
Affiliation:
Department of Materials Science and Engineering Cornell University, Bard Hall, Ithaca, NY 14853
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Abstract

Load relaxation testing has been demonstrated to be useful for characterizing the time dependent plastic properties of metals. However, for testing of small material volumes, such as thin film metallizations, thin films, and contact surfaces, conventional load relaxation techniques cannot be used. For such applications an indentation test offers an attractive means for obtaining data necessary for materials characterization. This work shows that an indentation load relaxation test is experimentally feasible for thin film testing. Experiments on brass and beryllium copper samples with or without a gold/nickel plating illustrate different relaxation properties of the substrates and the surface layers. Furthermore, results of experiments on some fcc metals suggest rather simple relations between the conventional uniaxial load relaxation (LR) test and the indentation load relaxation (ILR) test.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 40: Symposium J – Electronic Packaging Materials Science I , 1984 , 217
Copyright
Copyright © Materials Research Society 1985

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