Dislocation driven nanosample plasticity: new insights from quantitative in-situ TEM tensile testing.
(2018) Scientific Reports — Vol. 8, n° 1, p. 12012 (2018)
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- Authors
Devincre, Benoit 
- Abstract
- Intrinsic dislocation mechanisms in the vicinity of free surfaces of an almost FIB damage-free single crystal Ni sample have been quantitatively investigated owing to a novel sample preparation method combining twin-jet electro-polishing, in-situ TEM heating and FIB. The results reveal that the small-scale plasticity is mainly controlled by the conversion of few tangled dislocations, still present after heating, into stable single arm sources (SASs) as well as by the successive operation of these sources. Strain hardening resulting from the operation of an individual SAS is reported and attributed to the decrease of the length of the source. Moreover, the impact of the shortening of the dislocation source on the intermittent plastic flow, characteristic of SASs, is discussed. These findings provide essential information for the understanding of the regime of 'dislocation source' controlled plasticity and the related mechanical size effect.
- Affiliations
ONERA Laboratoire d'Etude des Microstructures University of Antwerp EMAT
Citations
Samaee, V., Gatti, R., Devincre, B., Pardoen, T., Schryvers, D., & Idrissi, H. (2018). Dislocation driven nanosample plasticity: new insights from quantitative in-situ TEM tensile testing. Scientific Reports, 8(1), 12012. https://doi.org/10.1038/s41598-018-30639-8 (Original work published 2018)