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dc.contributor.authorZhang, Ning
Carrez, Philippe
Shahsavari, Rouzbeh
dc.date.accessioned 2017-01-27T19:05:16Z
dc.date.available 2017-01-27T19:05:16Z
dc.date.issued 2017
dc.identifier.citation Zhang, Ning, Carrez, Philippe and Shahsavari, Rouzbeh. "Screw-Dislocation-Induced Strengthening–Toughening Mechanisms in Complex Layered Materials: The Case Study of Tobermorite." ACS Applied Materials & Interfaces, 9, no. 2 (2017) American Chemical Society: 1496-1506. http://dx.doi.org/10.1021/acsami.6b13107.
dc.identifier.urihttps://hdl.handle.net/1911/93782
dc.description.abstract Nanoscale defects such as dislocations have a profound impact on the physics of crystalline materials. Understanding and characterizing the motion of screw dislocation and its corresponding effects on the mechanical properties of complex low-symmetry materials has long been a challenge. Herein, we focus on triclinic tobermorite, as a model system and a crystalline analogue of layered hydrated cement, and report for the first time how the motion of screw dislocation can influence the strengthening–toughening relationship, imparting brittle-to-ductile transitions. By applying shear loading in tobermorite systems with single and dipole screw dislocations, we observe dislocation jogs around the dislocation core, which increases the yield shear stress and the work-of-fracture when the dislocation lines are along the [100] and [010] directions. Our results demonstrate that the dislocation core acts as a bottleneck for the initial straight gliding to induce intralaminar gliding, which consequently leads to a significant improvement in the mechanical properties. Together, the fundamental knowledge gained in this work on the role of the motion of the dislocation core on the mechanical properties provides an improved understanding of deformation mechanisms in cementitious materials and other complex layered systems, providing new hypotheses and design guidelines for the development of strong, ductile, and tough materials.
dc.language.iso eng
dc.publisher American Chemical Society
dc.rights This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.
dc.title Screw-Dislocation-Induced Strengthening–Toughening Mechanisms in Complex Layered Materials: The Case Study of Tobermorite
dc.type Journal article
dc.citation.journalTitle ACS Applied Materials & Interfaces
dc.contributor.org The Richard E. Smalley Institute for Nanoscale Science and Technology
dc.subject.keywordcementitious material
dislocation jog
interlaminar gliding
screw dislocation
strengthening−toughening mechanism
tobermorite
dc.citation.volumeNumber 9
dc.citation.issueNumber 2
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1021/acsami.6b13107
dc.identifier.pmid 28009497
dc.type.publication post-print
dc.citation.firstpage 1496
dc.citation.lastpage 1506


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