Extraordinary Response of H-Charged and H-Free Coherent Grain Boundaries in Nickel to Multiaxial Loading

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F20%3APU136809" target="_blank" >RIV/00216305:26620/20:PU136809 - isvavai.cz</a>
Result on the web
<a href="https://www.mdpi.com/2073-4352/10/7/590" target="_blank" >https://www.mdpi.com/2073-4352/10/7/590</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/cryst10070590" target="_blank" >10.3390/cryst10070590</a>

Result language
angličtina
Original language name
Extraordinary Response of H-Charged and H-Free Coherent Grain Boundaries in Nickel to Multiaxial Loading
Original language description
The cohesive strength of Σ3, v5, and v11 grain boundaries (GBs) in clean and hydrogen-segregated fcc nickel was systematically studied as a function of the superimposed transverse biaxial stresses using ab initio methods. The obtained results for H-free GBs revealed a quite different response of the coherent twinning boundary Σ3 to the applied transverse stresses in comparison to the other GB types. While the cohesive strength of Σ5 and Σ11 GBs increased with increasing level of tensile transverse stresses, the strength of Σ3 GB remained constant for any applied levels of transverse stresses. In the case of GBs with segregated hydrogen, the cohesive strength of Σ3 was distinctly reduced for all levels of transverse stresses, while the strength reduction of Σ5 and Σ11 GBs was significant only for a nearly isotropic (hydrostatic) triaxial loading. This extraordinary response explains a high susceptibility of Σ3 GBs to crack initiation, as recently reported in an experimental study. Moreover, a highly triaxial stress at the fronts of microcracks initiated at Σ3 boundaries caused a strength reduction of adjacent high-energy grain boundaries which thus became preferential sites for further crack propagation.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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