Characterization of power-law creep in the solid-acid CsHSO4 via nanoindentation
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© Materials Research Society 2019. A high-temperature nanoindentation system was used to examine the steady state indentation creep behavior of CsHSO 4 . This high proton conductivity solid-acid material is a candidate for use as a solid-state electrolyte in intermediate temperature fuel cells. Constant strain rate indentation creep tests yielded a stress exponent and a creep activation energy in close agreement with results obtained from previous uniaxial compression testing. The large penetration depths reached during creep testing necessitated validating an indenter area function well beyond depths measurable in fused silica. The developed methodology is material agnostic meaning it can be used for indentation creep measurements in other high creep rate materials. In addition, it is shown how an analysis developed by Bower et al. (Proc. Royal Soc. 441, 97-124, 1993) can be successfully used to convert the indentation creep parameters into the more common material parameters measured in uniaxial creep tests.
author list (cited authors)
Ginder, R. S., & Pharr, G. M.