Ductile-brittle transition of open-cell nanoporous Cu in tension: A reliance of specific surface area. (15th January 2020)

• Record Type: Journal Article
• Authors: Wang, L.; Bi, W.B.; Deng, L.; Xiao, S.F.; Li, B.; Deng, X.L.; Zhang, X.M.; Tang, J.F.; Hu, W.Y.
• Is Part Of: Scripta materialia. Number 175(2020)
• Page Start: 43
• Page End: 48
• Publication Date: 2020-01-15
• Subjects: Nanoporous -- Uniaxial tension -- Ductile-brittle transition -- Dislocation networks; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.08.030
• Languages: English
• ISSNs: 1359-6462

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. Graphical Abstract: Unlabelled Image