High temperature nanoindentation – the importance of isothermal contact

Optimum high temperature strength of two-dimensional nanocomposites

“…Current strategies for understanding the influence of temperature on NMM performance typically involve room temperature tests on NMMs that have been previously exposed to elevated temperatures. 6,7,10,11 With the recent progress in the development of the high-temperature nanoindentation (HT-Nano) testing technique, [12][13][14][15][16] it is now possible to study the deformation mechanisms within a localized region of the material at high temperatures, and this capability has been shown very valuable to study two-dimensional nanocomposites. 17,18 In this work, we combine the HT-Nano technique and crystal plasticity theory to study the effect of interface structure and layer thickness, L, on the high temperature behavior of a model NMM.…”

Comparison study of silicon carbide coatings produced at different deposition conditions with use of high temperature nanoindentation

“…Measurements at elevated temperatures, however, pose technical difficulties (such as thermal drift of electronics, thermal mismatch, tip blunting) that have been well described in the literature [16,19] and were mitigated cautiously during the experiments conducted here. Thus consistent values were obtained and the spread of individual results within one dataset of identical conditions was mostly similar to room temperature measurements.…”

“…The Poisson's ratio for diamond and SiC were 0.07 [15] and 0.21 [9], respectively. Numerous issues complicate nanoindentation measurements at elevated temperatures and those have been addressed in detail in the literature [16][17][18][19][20][21][22]. Special care was taken to achieve temperature congruency of the specimen surface and the indenter tip.…”

Advanced Nanomechanical Test Techniques

“…Consequently the instrument measures a combination of the indenter penetrating the sample and the dimensional change of the indenter thus compromising the experiment. The deficiencies of the sample-only heating approach were recently highlighted by Everitt et al on fused silica and gold [119], Tang and Zhang on Si [120], and Zarnetta et al on a TiNiCu shape memory alloy [121]. These studies reported elevated temperature indentation curves dominated by thermal drift when sample-only heating was used.…”