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Low-temperature failure mechanism of [001] niobium micropillars under uniaxial tension

Published online by Cambridge University Press:  23 September 2020

Gyuho Song Open the ORCID record for Gyuho Song [Opens in a new window] ,
Nicole K. Aragon ,
Ill Ryu  and
Seok-Woo Lee
Gyuho Song*
Affiliation:
Department of Materials Science and Engineering, Institute of Materials Science, University of Connecticut, Storrs, Connecticut06269-3136, USA
Nicole K. Aragon
Affiliation:
Department of Mechanical Engineering, Erik Jonsson School of Engineering and Computer Science, The University of Texas at Dallas, Richardson, Texas75080, USA
Ill Ryu
Affiliation:
Department of Mechanical Engineering, Erik Jonsson School of Engineering and Computer Science, The University of Texas at Dallas, Richardson, Texas75080, USA
Seok-Woo Lee
Affiliation:
Department of Materials Science and Engineering, Institute of Materials Science, University of Connecticut, Storrs, Connecticut06269-3136, USA
*
a)Address all correspondence to this author. e-mail: gyuho.song@uconn.edu
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Abstract

The plasticity of body-centered cubic (bcc) metals is dependent of temperature as well as sample dimension at the micrometer scale, but the effects of cryogenic temperature on the plasticity and the related failure process in micron-sized bcc metals have not been studied under uniaxial tension. In this work, we utilized in situ cryogenic micro-tensile tests, transmission electron microscopy, and dislocation dynamic simulations to examine the plasticity and failure processes of [001]-oriented bcc niobium micropillars. Our study reveals that a strong suppression of cross-slip at low temperatures prevents dislocation multiplication and leads to a dislocation starvation state, at which no mobile dislocation exists due to the rapid annihilation of dislocations at free surfaces. New dislocations are then nucleated until stress concentration at a slip step creates a micro-crack, the propagation of which leads to catastrophic failure. This unique failure process results from the combined effects of sample dimension and temperature.

Keywords

dislocationfractureNb

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Type
Invited Paper
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Journal of Materials Research , First View , pp. 1 - 12
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Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of Materials Research Society

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