On the critical thickness for non-localized to localized plastic flow transition in metallic glasses: A molecular dynamics study. (15th March 2016)

• Record Type: Journal Article
• Authors: Zhong, C.; Zhang, H.; Cao, Q.P.; Wang, X.D.; Zhang, D.X.; Ramamurty, U.; Jiang, J.Z.
• Is Part Of: Scripta materialia. Volume 114(2016)
• Page Start: 93
• Page End: 97
• Publication Date: 2016-03-15
• Subjects: Metallic glass -- Molecular dynamic simulation -- Mechanical -- Behavior -- Size effect; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.12.012
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Molecular dynamics simulations were employed to investigate the specimen thickness-dependent tensile behavior of a series of Cu x Zr100- x ( x = 20, 40, 50, 64 and 80 at.%) metallic glass (MG) films, with a particular focus on the critical thickness, t c, below which non-localized plastic flow takes place. The simulation results reveal that while the transition occurs in all the alloys examined, t c is sensitive to the composition. We rationalize t c by postulating that the strain energy stored in the sample at the onset of plastic deformation has to be sufficient for the formation of shear bands. The composition-dependence of t c was found to correlate with the average activation energy of the atomic level plastic deformation events.