Temperature dependence of the indentation size effect

Franke, Oliver; Trenkle, Jonathan C.; Schuh, Christopher A.

doi:10.1557/jmr.2010.0159

Cited by 49 publications

(37 citation statements)

References 28 publications

(20 reference statements)

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“…(4). At high temperatures, the dynamic recovery by dislocation annihilation is expected to be significant, which explains why the high temperature indentation on Cu in the work of Franke et al 18 exhibits a similar trend as W and Al, but more pronounced temperature effect ($3.5 times increase in h Ã ef f from 296 to 473 K). Because the cross-slip probability has an exponential dependence on temperature, the mechanical recovery rate would be more rapid at the higher temperature even though Cu (44.6 mJ/m 2 ) has the stacking fault energy lower than Al (145.5 mJ/m 2 ).…”

Section: à2mentioning

confidence: 95%

“…For W and Al, both showed the opposite trend, and a similar experimental finding of higher h Ã ef f at lower temperatures was recently reported in high-temperature nanoindentation on Cu. 18 This Cu work mentioned the temperature-dependent storage volume for the GNDs to explain their temperature effects. [18][19][20] The size of the plastic zone as well as the storage volume could be affected by dislocation mechanisms, which could be different with material parameter and temperature.…”

mentioning

confidence: 99%

“…18 This Cu work mentioned the temperature-dependent storage volume for the GNDs to explain their temperature effects. [18][19][20] The size of the plastic zone as well as the storage volume could be affected by dislocation mechanisms, which could be different with material parameter and temperature. However, the model of Qui et al assumes the storage volume of GNDs as the hemisphere volume with the tip contact radius for all materials, as the Nix-Gao model does.…”

mentioning

confidence: 99%

“…For the better clarification, an advanced computational technique, such as dislocation dynamics simulation, would be necessary. In Cu work, 18 it was argued that the higher dislocation mobility at the higher temperature leads to the larger GND storage volume. However, our results show the completely opposite trend between W and Nb regardless of the similar temperature effects on the dislocation mobility.…”

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confidence: 99%

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Cryogenic nanoindentation size effect in [0 0 1]-oriented face-centered cubic and body-centered cubic single crystals

Lee

Meza

Greer

2013

Applied Physics Letters

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Cryogenic nanoindentation experiments performed on [0 0 1]-oriented single crystalline Nb, W, Al, and Au in an in situ nanomechanical instrument with customized cryogenic testing capability revealed temperature dependence on nanoindentation size effect. The Nix-Gao model, commonly used to capture indentation size effect at room temperature, does not take into account thermal effects and hence is not able to explain these experimental results where both hardness at infinite indentation depth and characteristic material length scale were found to be strong functions of temperature. Physical attributes are critically examined in the framework of intrinsic lattice resistance and dislocation cross-slip probability.

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Section: à2mentioning

confidence: 95%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Cryogenic nanoindentation size effect in [0 0 1]-oriented face-centered cubic and body-centered cubic single crystals

Lee

Meza

Greer

2013

Applied Physics Letters

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“…Using elevated temperature nanoindentation, Franke et al [50] investigated the indentation size effect in copper up to 200 °C (0.348 T m ) and observed a significant decrease in magnitude at elevated temperature, in contrast to microcompression results of Al at similar homologous temperatures. Therefore, the aim of the present paper is to systematically investigate the plasticity of FCC pillar structures at the micron and sub-micron regimes, for the first time, at elevated temperatures up to 400 °C (0.495 T m ).…”

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confidence: 99%

The effect of size on the strength of FCC metals at elevated temperatures: annealed copper

Wheeler

Kirchlechner

Micha

et al. 2016

Philosophical Magazine

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As the length scale of sample dimensions is reduced to the micron and sub-micron scales, the strength of various materials has been observed to increase with decreasing size, a fact commonly referred to as the ‘sample size effect’. In this work, the influence of temperature on the sample size effect in copper is investigated using in situ microcompression testing at 25, 200 and 400 °C in the SEM on vacuum-annealed copper structures, and the resulting deformed structures were analysed using X-ray μLaue diffraction and scanning electron microscopy. For pillars with sizes between 0.4 and 4 μm, the size effect was measured to be constant with temperature, within the measurement precision, up to half of the melting point of copper. It is expected that the size effect will remain constant with temperature until diffusion-controlled dislocation motion becomes significant at higher temperatures and/or lower strain rates. Furthermore, the annealing treatment of the copper micropillars produced structures which yielded at stresses three times greater than their un-annealed, FIB-machined counterparts.

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Activation energy of the low-load NaCl transition from nanoindentation loading curves

Kaupp

2014

Scanning

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Access to activation energies E(a) of phase transitions is opened by unprecedented analyses of temperature dependent nanoindentation loading curves. It is based on kinks in linearized loading curves, with additional support by coincidence of kink and electrical conductivity of silicon loading curves. Physical properties of B1, B2, NaCl and further phases are discussed. The normalized low-load transition energy of NaCl (Wtrans/µN) increases with temperature and slightly decreases with load. Its semi-logarithmic plot versus T obtains activation energy E(a)/µN for calculation of the transition work for all interesting temperatures and pressures. Arrhenius-type activation energy (kJ/mol) is unavailable for indentation phase transitions. The E(a) per load normalization proves insensitive to creep-on-load, which excludes normalization to depth or volume for large temperature ranges. Such phase transition E(a)/µN is unprecedented material's property and will be of practical importance for the compatibility of composite materials under impact and further shearing interactions at elevated temperatures.

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Temperature dependence of the indentation size effect

Cited by 49 publications

References 28 publications

Cryogenic nanoindentation size effect in [0 0 1]-oriented face-centered cubic and body-centered cubic single crystals

Cryogenic nanoindentation size effect in [0 0 1]-oriented face-centered cubic and body-centered cubic single crystals

The effect of size on the strength of FCC metals at elevated temperatures: annealed copper

Activation energy of the low-load NaCl transition from nanoindentation loading curves

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