Liang Wang, W. Bi, L. Deng, S. Xiao, Li Bingqing, X. Deng, Xingming Zhang, Jian-feng Tang, Wangyu Hu
{"title":"Ductile-Brittle Transition of Open-Cell Nanoporous Cu in Tension: A Reliance of Specific Surface Area","authors":"Liang Wang, W. Bi, L. Deng, S. Xiao, Li Bingqing, X. Deng, Xingming Zhang, Jian-feng Tang, Wangyu Hu","doi":"10.2139/ssrn.3414017","DOIUrl":null,"url":null,"abstract":"Abstract We report the ductile-brittle transitions and their reliances on specific surface area (γ), for the bi-continuous and open-cell nanoporous (NP) Cu in tension, using molecular dynamics simulations. With an increase of γ, NP Cu undergo the first ductile-to-brittle (γ≤ 2.13 nm−1) and subsequent brittle-to-ductile (γ > 2.13 nm−1) transitions. Two different plasticity modes are governing such two ductile-brittle transitions: dislocation activities inhibition for the former and dislocation networks formation contributes to the latter. Serving as the origin of dislocations/stacking faults, the surface characteristic plays a key role in such ductile-brittle transition and deformation modes.","PeriodicalId":7765,"journal":{"name":"AMI: Scripta Materialia","volume":"78 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2019-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"AMI: Scripta Materialia","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2139/ssrn.3414017","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
Abstract We report the ductile-brittle transitions and their reliances on specific surface area (γ), for the bi-continuous and open-cell nanoporous (NP) Cu in tension, using molecular dynamics simulations. With an increase of γ, NP Cu undergo the first ductile-to-brittle (γ≤ 2.13 nm−1) and subsequent brittle-to-ductile (γ > 2.13 nm−1) transitions. Two different plasticity modes are governing such two ductile-brittle transitions: dislocation activities inhibition for the former and dislocation networks formation contributes to the latter. Serving as the origin of dislocations/stacking faults, the surface characteristic plays a key role in such ductile-brittle transition and deformation modes.