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Temperature-dependent mechanical behavior of three-dimensionally ordered macroporous tungsten

Published online by Cambridge University Press:  08 June 2020

Kevin M. Schmalbach
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota55455, USA
Zhao Wang
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota55455, USA
R. Lee Penn
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota55455, USA
David Poerschke
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota55455, USA
Antonia Antoniou
Affiliation:
George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia30332, USA
Andreas Stein*
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota55455, USA
Nathan A. Mara*
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota55455, USA
*
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

Porous metals represent a class of materials where the interplay of ligament length, width, node structure, and local geometry/curvature offers a rich parameter space for the study of critical length scales on mechanical behavior. Colloidal crystal templating of three-dimensionally ordered macroporous (3DOM, i.e., inverse opal) tungsten provides a unique structure to investigate the mechanical behavior at small length scales across the brittle–ductile transition. Micropillar compression tests show failure at 50 MPa contact pressure at 30 °C, implying a ligament yield strength of approximately 6.1 GPa for a structure with 5% relative density. In situ SEM frustum indentation tests with in-plane strain maps perpendicular to loading indicate local compressive strains of approximately 2% at failure at 30 °C. Increased sustained contact pressure is observed at 225 °C, although large (20%) nonlocal strains appear at 125 °C. The elevated-temperature mechanical performance is limited by cracks that initiate on planes of greatest shear under the indenter.

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Article
Copyright
Copyright © Materials Research Society 2020

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Footnotes

c)

These authors contributed equally to this work.

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