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

Song, Gyuho; Aragon, Nicole K.; Ryu, Ill; Lee, Seok-Woo

doi:10.1557/jmr.2020.252

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

Journal Article · Wed Sep 23 00:00:00 EDT 2020 · Journal of Materials Research

DOI:https://doi.org/10.1557/jmr.2020.252· OSTI ID:1669904

^[1]; Aragon, Nicole K. ^[2]; Ryu, Ill ^[2]; ^[3]

University of Connecticut, Storrs, CT (United States); University of Connecticut
University of Texas at Dallas, Richardson, TX (United States)
University of Connecticut, Storrs, CT (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: University of Connecticut, Storrs, CT (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0018895

OSTI ID:: 1669904

Journal Information:: Journal of Materials Research, Journal Name: Journal of Materials Research Vol. 36; ISSN 0884-2914

Publisher:: Materials Research SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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

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