Plastic instabilities explored via acoustic emission during spherical nanoindentation

0561962 - FZÚ 2023 RIV CH eng J - Journal Article
Čtvrtlík, Radim - Čech, J. - Tomáštík, Jan - Václavek, Lukáš - Haušild, P.
Plastic instabilities explored via acoustic emission during spherical nanoindentation.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 841, April (2022), č. článku 143019. ISSN 0921-5093. E-ISSN 1873-4936
Institutional support: RVO:68378271
Keywords : indentation * acoustic emission * silicon iron single crystal * plastic deformation * reversible plasticity
OECD category: Materials engineering
Impact factor: 6.4, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.msea.2022.143019

The plastic instabilities of a silicon iron single crystal (Fe single crystal doped with 3 wt% of Si) were explored via spherical nanoindentation coupled with an acoustic emission detection at nano/micro-scale. Three possible scenarios were identified (gradually developing plasticity without detectable AE activity, sudden onset of plasticity with strong AE event, and an elastic response with frequent AE activity both during loading and unloading). Beside the irreversible dislocation slip, the reversible microstructural changes were identified that in turn provokes to extend the common definition of acoustic emission from a phenomenon caused by the sudden irreversible microstructural changes by including also reversible atomic reorganization. AE activity at nano/ micro-scale was for the first time observed during both the loading and the unloading for purely elastic indentations suggesting an action of reversible twinning.

Permanent Link: https://hdl.handle.net/11104/0334393