Ductile-brittle transition of open-cell nanoporous Cu in tension: A reliance of specific surface area

L Wang and WB Bi and L Deng and SF Xiao and B Li and XL Deng and XM Zhang and JF Tang and WY Hu, SCRIPTA MATERIALIA, 175, 43-48 (2020).

DOI: 10.1016/j.scriptamat.2019.08.030

We report the ductile-brittle transitions and their reliances on specific surface area (gamma), for the bicontinuous and open-cell nanoporous (NP) Cu in tension, using molecular dynamics simulations. With an increase of gamma, NP Cu undergo the first ductile-to-brittle (gamma <= 2.13 nm(-1)) and subsequent brittle-to-ductile (gamma <= 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. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Return to Publications page