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Smaller is Plastic: Polymorphic Structures and Mechanism of Deformation in Nanoscale hcp Metals

Bhogra, Meha and Ramamurty, U and Waghmare, Umesh V (2015) Smaller is Plastic: Polymorphic Structures and Mechanism of Deformation in Nanoscale hcp Metals. In: NANO LETTERS, 15 (6). pp. 3697-3702.

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Official URL: http://dx.doi.org/10.1021/nl504978t

Abstract

Using first-principles calculations, we establish the existence of highly-stable polymorphs of hcp metals (Ti, Mg, Be, La and Y) with nanoscale structural periodicity. They arise from heterogeneous deformation of the hcp structure occurring in response to large shear stresses localized at the basal planes separated by a few nanometers. Through Landau theoretical analysis, we show that their stability derives from nonlinear coupling between strains at different length scales. Such multiscale hyperelasticity and long-period structures constitute a new mechanism of size-dependent plasticity and its enhancement in nanoscale hcp metals.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Keywords: Structural transitions; hcp metals; polymorphism; hyperelasticity; planar faults
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 31 Jul 2015 05:57
Last Modified: 31 Jul 2015 05:57
URI: http://eprints.iisc.ac.in/id/eprint/51925

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