High temperature micropillar compression of Al/SiC nanolaminates

Lotfian, S. and Rodriguez, M. and Yazzie, K.E. and Chawla, N. and Llorca Martinez, Francisco Javier and Molina Aldareguía, Jon M. (2013). High temperature micropillar compression of Al/SiC nanolaminates. "Acta Materialia", v. 61 (n. 12); pp. 4439-4451. ISSN 1359-6454. https://doi.org/10.1016/j.actamat.2013.04.013.

Description

Title: High temperature micropillar compression of Al/SiC nanolaminates
Author/s:
  • Lotfian, S.
  • Rodriguez, M.
  • Yazzie, K.E.
  • Chawla, N.
  • Llorca Martinez, Francisco Javier
  • Molina Aldareguía, Jon M.
Item Type: Article
Título de Revista/Publicación: Acta Materialia
Date: July 2013
ISSN: 1359-6454
Volume: 61
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 the temperature on the compressive stress–strain behavior of Al/SiC nanoscale multilayers was studied by means of micropillar compression tests at 23 °C and 100 °C. The multilayers (composed of alternating layers of 60 nm in thickness of nanocrystalline Al and amorphous SiC) showed a very large hardening rate at 23 °C, which led to a flow stress of 3.1 ± 0.2 GPa at 8% strain. However, the flow stress (and the hardening rate) was reduced by 50% at 100 °C. Plastic deformation of the Al layers was the dominant deformation mechanism at both temperatures, but the Al layers were extruded out of the micropillar at 100 °C, while Al plastic flow was constrained by the SiC elastic layers at 23 °C. Finite element simulations of the micropillar compression test indicated the role played by different factors (flow stress of Al, interface strength and friction coefficient) on the mechanical behavior and were able to rationalize the differences in the stress–strain curves between 23 °C and 100 °C.

More information

Item ID: 29079
DC Identifier: http://oa.upm.es/29079/
OAI Identifier: oai:oa.upm.es:29079
DOI: 10.1016/j.actamat.2013.04.013
Official URL: http://www.sciencedirect.com/science/article/pii/S1359645413002863
Deposited by: Memoria Investigacion
Deposited on: 24 Jun 2014 09:17
Last Modified: 01 Aug 2015 22:56
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