{"title":"Hydrogen embrittlement of iron nanowires: investigating size and orientation dependence on loading behaviour","authors":"Liam S. Morrissey","doi":"10.1080/08927022.2023.2279136","DOIUrl":null,"url":null,"abstract":"ABSTRACTWith the ever-increasing use and applications of nanowires it has never been more imperative to understand how environmental interactions modify their unique mechanical properties and loading behaviour. While experimental research has shown that atomic hydrogen degrades mechanical properties through hydrogen embrittlement, results are limited and often do not directly quantify the hydrogen concentration or consider small diameter nanowires. In this study, we have used molecular dynamics simulations to the study the effect of atomic hydrogen on iron nanowires with various orientations and diameters. Results demonstrate that with increasing hydrogen concentration there is a clear reduction in the elastic modulus and yield stress as compared to the hydrogen free case for all diameters and orientations considered. In addition, this reduction in mechanical properties appears to exhibit a size dependence, with larger reductions being found in nanowires with larger cross-sectional diameters. We suggest that smaller diameter nanowires, with a higher ratio of surface to bulk atoms, are more influenced by free surface atoms than lattice distortions from atomic hydrogen. As this ratio of surface to bulk atoms is decreased, the larger diameter nanowires become less affected by free surfaces and more susceptible to the effect of atomic hydrogen.KEYWORDS: Nanowireshydrogen embrittlementelastic modulus AcknowledgementsDr. Morrissey would like to acknowledge the National Sciences and Engineering Research Council of Canada for their support of the research via the Discovery Grant.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by Natural Sciences and Engineering Research Council of Canada.","PeriodicalId":18863,"journal":{"name":"Molecular Simulation","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Molecular Simulation","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1080/08927022.2023.2279136","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
ABSTRACTWith the ever-increasing use and applications of nanowires it has never been more imperative to understand how environmental interactions modify their unique mechanical properties and loading behaviour. While experimental research has shown that atomic hydrogen degrades mechanical properties through hydrogen embrittlement, results are limited and often do not directly quantify the hydrogen concentration or consider small diameter nanowires. In this study, we have used molecular dynamics simulations to the study the effect of atomic hydrogen on iron nanowires with various orientations and diameters. Results demonstrate that with increasing hydrogen concentration there is a clear reduction in the elastic modulus and yield stress as compared to the hydrogen free case for all diameters and orientations considered. In addition, this reduction in mechanical properties appears to exhibit a size dependence, with larger reductions being found in nanowires with larger cross-sectional diameters. We suggest that smaller diameter nanowires, with a higher ratio of surface to bulk atoms, are more influenced by free surface atoms than lattice distortions from atomic hydrogen. As this ratio of surface to bulk atoms is decreased, the larger diameter nanowires become less affected by free surfaces and more susceptible to the effect of atomic hydrogen.KEYWORDS: Nanowireshydrogen embrittlementelastic modulus AcknowledgementsDr. Morrissey would like to acknowledge the National Sciences and Engineering Research Council of Canada for their support of the research via the Discovery Grant.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by Natural Sciences and Engineering Research Council of Canada.
期刊介绍:
Molecular Simulation covers all aspects of research related to, or of importance to, molecular modelling and simulation.
Molecular Simulation brings together the most significant papers concerned with applications of simulation methods, and original contributions to the development of simulation methodology from biology, biochemistry, chemistry, engineering, materials science, medicine and physics.
The aim is to provide a forum in which cross fertilization between application areas, methodologies, disciplines, as well as academic and industrial researchers can take place and new developments can be encouraged.
Molecular Simulation is of interest to all researchers using or developing simulation methods based on statistical mechanics/quantum mechanics. This includes molecular dynamics (MD, AIMD), Monte Carlo, ab initio methods related to simulation, multiscale and coarse graining methods.