ausblenden:
Schlagwörter:
Chromium alloys; Entropy; Hydrogen; Iron alloys; Manganese alloys; Nanoindentation; Shear flow; Vacancies, Defect formation energies; Dislocation nucleation; Dissolved hydrogen; High entropy alloys; Incipient plasticity; Nanoindentation experiments; Plastic flow resistance; Shear yield strength, Cobalt alloys
Zusammenfassung:
The influence of hydrogen on the onset of plastic deformation in a CoCrFeMnNi high-entropy alloy (HEA) was examined through the analysis of the load at which first pop-in during spherical nanoindentation experiments occurs on hydrogen-charged and subsequently aged specimens. Results reveal that the dissolved hydrogen lowers the plastic flow resistance, indicated by the shear yield strength, τy, by modifying defect formation energies. Aging, subsequent to charging, leads to recovery of τy, but only partially. The results are discussed in terms of the vacancy-mediated dislocation nucleation, which is supported by the estimated activation volume for deformation. © 2018 Acta Materialia Inc.
