Constant Load Testing of Materials Using Nanoindentation Technique

Abstract:

Experiments were conducted to evaluate creep behavior of conventional and ultrafine-grained metallic materials using nanoindentation technique. The polished surface of samples was loaded up to 5 mN. The load was held constant to examine the creep behavior. Nanoindentation tests were performed at room temperature. Strain rate was evaluated from load and displacement data. The stress exponents of strain rates n were determined from loading stress dependences of creep rate. The values of stress exponents of the indentation strain rate indicate that creep behavior of investigated materials is influenced in particular by slip of intragranular dislocations. By contrast, deformation mechanisms like grain boundary sliding and diffusion processes seem to be improbable.

• Periodical: Key Engineering Materials (Volume 606)
• Pages: 69-72
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.606.69
• Online since: March 2014
• Authors: Petr Král*, Jiří Dvořák, Marie Kvapilová, Jaroslav Lukeš, Vaclav Sklenička
• Keywords: Metallic Materials, Nanoindentation Creep, Ultrafine-Grained Microstructure

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