dc.contributor.author | Zhao, Kai | |
dc.contributor.author | He, Jianying | |
dc.contributor.author | Mayer, A. E. | |
dc.contributor.author | Zhang, Zhiliang | |
dc.date.accessioned | 2019-02-20T08:53:23Z | |
dc.date.available | 2019-02-20T08:53:23Z | |
dc.date.created | 2018-01-14T17:44:19Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Acta Materialia. 2018, 148 18-27. | nb_NO |
dc.identifier.issn | 1359-6454 | |
dc.identifier.uri | http://hdl.handle.net/11250/2586423 | |
dc.description.abstract | Most of the studies reported treats the effect of hydrogen on single dislocation line, while models that describe the collective interaction are missing. In this study, hydrogen-induced softening of metallic materials is studied from a perspective of collective behavior of dislocations. Building on the evolution of dislocation density, a hydrogen-informed expanding cavity model is developed for the first time to predict the dynamic evolution of load-displacement curve obtained from nanoindentation tests. Large-scale molecular dynamics simulations on the mechanical behavior of fcc Ni with and without hydrogen (H) charged are performed to calibrate the proposed continuum model. The results show that the H-induced decrease of indentation force is due to that the energy barrier for dislocation nucleation is lowered by the solute drag of the H atmosphere formed around dislocations. Envisioned as a complex non-equilibrium process, it is found that the power-law exponent of the self-organized criticality of dislocations increases due to the insertion of H atoms. Analysis also indicates that H can reduce the probability of dislocation pile-up, thus promote the delivery of dislocations to the surface of specimens during nanoindentation. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | Elsevier | nb_NO |
dc.title | Effect of Hydrogen on the Collective Behavior of Dislocations in the Case of Nanoindentation | nb_NO |
dc.title.alternative | Effect of Hydrogen on the Collective Behavior of Dislocations in the Case of Nanoindentation | nb_NO |
dc.type | Journal article | nb_NO |
dc.description.version | submittedVersion | nb_NO |
dc.source.pagenumber | 18-27 | nb_NO |
dc.source.volume | 148 | nb_NO |
dc.source.journal | Acta Materialia | nb_NO |
dc.identifier.doi | 10.1016/j.actamat.2018.01.053 | |
dc.identifier.cristin | 1542249 | |
dc.relation.project | Notur/NorStore: NN9391k | nb_NO |
dc.relation.project | Norges forskningsråd: 234130 | nb_NO |
dc.relation.project | Notur/NorStore: NN9110k | nb_NO |
dc.description.localcode | This is a submitted manuscript of an article published by Elsevier Ltd in Acta Materialia, 3 February 2018. | nb_NO |
cristin.unitcode | 194,64,45,0 | |
cristin.unitname | Institutt for konstruksjonsteknikk | |
cristin.ispublished | true | |
cristin.fulltext | preprint | |
cristin.qualitycode | 2 | |