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A new nanoindentation creep technique using constant contact pressure

Published online by Cambridge University Press:  02 July 2019

Olena Prach ,
Christian Minnert ,
Kurt E. Johanns  and
Karsten Durst
Olena Prach*
Affiliation:
Physical Metallurgy, Materials Science, Technische Universität Darmstadt, Darmstadt 64287, Germany
Christian Minnert
Affiliation:
Physical Metallurgy, Materials Science, Technische Universität Darmstadt, Darmstadt 64287, Germany
Kurt E. Johanns
Affiliation:
Physical Metallurgy, Materials Science, Technische Universität Darmstadt, Darmstadt 64287, Germany
Karsten Durst
Affiliation:
Physical Metallurgy, Materials Science, Technische Universität Darmstadt, Darmstadt 64287, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A new constant contact pressure (CCP) indentation creep method is presented, which is based on keeping the mean contact pressure as defined through Sneddon’s hardness constant, until a steady-state strain rate is achieved. This is in contrast to the conventional constant load–hold (CLH) creep experiments, where the load is held constant and relaxation in both hardness and strain rate occurs at the same time. Besides controlling the mean contact pressure, the dynamic stiffness is furthermore used to assess the indentation depth, thereby minimizing thermal drift influence and pile-up or sink-in effects during long-term experiments. The CCP method has been tested on strain rate sensitive ultrafine-grained (UFG) CuZn30 and UFG CuZn5 as well as on fused silica, comparing the results with those of strain rate jump tests as well as the CLH nanoindentation creep tests. With the CCP method, strain rates from 5 × 10−4 s−1 down to 5 × 10−6 s−1 can be achieved, keeping the mean contact pressure constant over a long period of time, in contrast to the CLH method. The CCP technique thus offers the possibility of performing long-term creep experiments while retaining the contact stress underneath the tip constant.

Keywords

nano-indentationnanostructurestrengthactivation analysis
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 14 , 28 July 2019 , pp. 2492 - 2500
Copyright
Copyright © Materials Research Society 2019 

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