Atomistic simulation of the mechanical response of a nanoporous body-centered cubic metal

SCRIPTA MATERIALIA

卷:68

Article

Ruestes, C. J.¹  Bringa, E. M.^1,2  Stukowski, A.³  Nieva, J. F. Rodriguez⁴  Bertolino, G.⁵  Tang, Y.⁶  Meyers, M. A.⁶ 

[1] Univ Nacl Cuyo, Inst Ciencias Basicas, RA-5500 Mendoza, Argentina

[2] Consejo Nacl Invest Cient & Tecn, RA-5500 Mendoza, Argentina

[3] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[4] MIT, Cambridge, MA 02139 USA

[5] CONICET Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[6] Univ Calif San Diego, La Jolla, CA 92093 USA

关键词: Molecular dynamics;    Dislocations;    Nanoporous;    Nanovoid;   

DOI  :  10.1016/j.scriptamat.2013.01.035

来源: Elsevier

【 摘 要 】

Uniaxial strain compression of a Ta monocrystal containing randomly placed nanovoids was studied using molecular dynamics simulations. Interacting voids decrease the stress required for the onset of plasticity, in comparison with earlier studies for isolated voids. Dislocations resulting from loading are emitted from void surfaces as shear loops, with their interactions leading to hardening. Plastic activity leads to a decrease in porosity, with voids disappearing at 14% strain. The resulting dislocation densities agree well with experimental results. (c) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free