Effect of misorientation on the compression of highly anisotropic single-crystal micropillars

Soler, R. and Molina Aldareguía, Jon M. and Segurado Escudero, Javier and Llorca Martinez, Francisco Javier (2012). Effect of misorientation on the compression of highly anisotropic single-crystal micropillars. "Advanced Engineering Materials", v. 14 (n. 11); pp. 1004-1008. ISSN 1438-1656.

Description

Title: Effect of misorientation on the compression of highly anisotropic single-crystal micropillars
Author/s:
  • Soler, R.
  • Molina Aldareguía, Jon M.
  • Segurado Escudero, Javier
  • Llorca Martinez, Francisco Javier
Item Type: Article
Título de Revista/Publicación: Advanced Engineering Materials
Date: 2012
ISSN: 1438-1656
Volume: 14
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The effect of crystal misorientation, geometrical tilt, and contact misalignment on the compression of highly anisotropic single crystal micropillars was assessed by means of crystal plasticity finite element simulations. The investigation was focused in single crystals with the NaCl structure, like MgO or LiF, which present a marked plastic anisotropy as a result of the large difference in the critical resolved shear stress between the “soft” {110}〈110〉 and the “hard” {100}〈110〉 active slip systems. It was found that contact misalignment led to a large reduction in the initial stiffness of the micropillar in crystals oriented in the soft and hard direction. The crystallographic tilt did not modify, however, the initial crystal stiffness. From the viewpoint of the plastic response, none of the effects analyzed led to significant differences in the flow stress when the single crystals were oriented along the “soft” [100] direction. Large differences were found, however, if the single crystal was oriented in the “hard” [111] direction as a result of the activation of the soft slip system. Numerical simulations were in very good agreement with experimental literature data.

More information

Item ID: 16012
DC Identifier: http://oa.upm.es/16012/
OAI Identifier: oai:oa.upm.es:16012
Official URL: http://onlinelibrary.wiley.com/doi/10.1002/adem.201200019/abstract
Deposited by: Memoria Investigacion
Deposited on: 09 Jan 2014 15:59
Last Modified: 22 Sep 2014 11:10
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