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

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. As a result, this unique failure process results from the combined effects of sample dimension and temperature.

Authors:
ORCiD logo [1];  [2];  [2]; ORCiD logo [1]
  1. University of Connecticut, Storrs, CT (United States)
  2. University of Texas at Dallas, Richardson, TX (United States)
Publication Date:
Research Org.:
Univ. of Connecticut, Storrs, CT (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1669904
Grant/Contract Number:  
SC0018895
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Name: Journal of Materials Research; Journal ID: ISSN 0884-2914
Publisher:
Materials Research Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Dislocation; Fracture; Niobium; Micrometer-scale; Nb

Citation Formats

Song, Gyuho, Aragon, Nicole K., Ryu, Ill, and Lee, Seok-Woo. Low-temperature failure mechanism of [001] niobium micropillars under uniaxial tension. United States: N. p., 2020. Web. doi:10.1557/jmr.2020.252.
Song, Gyuho, Aragon, Nicole K., Ryu, Ill, & Lee, Seok-Woo. Low-temperature failure mechanism of [001] niobium micropillars under uniaxial tension. United States. doi:10.1557/jmr.2020.252.
Song, Gyuho, Aragon, Nicole K., Ryu, Ill, and Lee, Seok-Woo. Wed . "Low-temperature failure mechanism of [001] niobium micropillars under uniaxial tension". United States. doi:10.1557/jmr.2020.252.
@article{osti_1669904,
title = {Low-temperature failure mechanism of [001] niobium micropillars under uniaxial tension},
author = {Song, Gyuho and Aragon, Nicole K. and Ryu, Ill and Lee, Seok-Woo},
abstractNote = {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. As a result, this unique failure process results from the combined effects of sample dimension and temperature.},
doi = {10.1557/jmr.2020.252},
journal = {Journal of Materials Research},
issn = {0884-2914},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {9}
}

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