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Time Dependent Indentation Testing At Non-Ambient Temperatures Utilizing the High Temperature Mechanical Properties Microprobe

Published online by Cambridge University Press:  21 February 2011

B. N. Lucas  and
W. C. Oliver
B. N. Lucas
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN and The University of Tennessee, Knoxville
W. C. Oliver
Affiliation:
Nano Instruments, Inc., PO. Box 14211, Knoxville, TN 37914
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Abstract

Time dependent indentation data for pure indium from -100 °C to 75 °C is presented. The properties reported include hardness, indentation strain rate, stress exponent and apparent activation energy for creep. These properties were measured using a depth-sensing indentation system capable of performing experiments between -100 °C and 300 °C in ultra-high vacuum. In addition, by employing laser interferometric techniques, this system can obtain displacement data with time constants as low as 50 ns. This allows the investigation of the material response to very fast stress changes over an extremely wide range of strain rates. The adverse and beneficial dynamic effects of step-loading the indenter into the surface of the material will be discussed. Initial results obtained from this type of experiment show that it is possible to obtain energy dissipation or damping information from the material being studied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 356: Symposium B2 – Thin Films: Stresses and Mechanical Properties V , 1994 , 645
Copyright
Copyright © Materials Research Society 1995

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