Development of low angle grain boundaries in lightly deformed superconducting niobium and their influence on hydride distribution and flux perturbation

Sung, Z. -H.; Wang, M.; Polyanskii, A. A.; Santosh, C.; Balachandran, S.; Compton, C.; Larbalestier, D. C.; Bieler, T. R.; Lee, P. J.

doi:10.1063/1.4983512

Title: Development of low angle grain boundaries in lightly deformed superconducting niobium and their influence on hydride distribution and flux perturbation

Journal Article · Fri May 19 00:00:00 EDT 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4983512· OSTI ID:1361685

Sung, Z. -H. ^[1]; Wang, M. ^[2];

^[1];

^[1]; Compton, C. ^[3];

^[1]; Bieler, T. R. ^[2];

^[1]

Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab). Applied Superconductivity Center
Michigan State Univ., East Lansing, MI (United States). Dept. of Mechanical Engineering
Michigan State Univ., East Lansing, MI (United States). Facility for Rare Isotope Beams

This study shows that low angle grain boundaries (LAGBs) can be created by small 5% strains in high purity (residual resistivity ratio ≥ 200) superconducting radio frequency (SRF)-grade single crystalline niobium (Nb) and that these boundaries act as hydrogen traps as indicated by the distribution of niobium hydrides (Nb1-xHx). Nb1-xHx is detrimental to SRF Nb cavities due to its normal conducting properties at cavity operating temperatures. By designing a single crystal tensile sample extracted from a large grain (>5 cm) Nb ingot slice for preferred slip on one slip plane, LAGBs and dense dislocation boundaries developed. With chemical surface treatments following standard SRF cavity fabrication practice, Nb_1-xH_x phases were densely precipitated at the LAGBs upon cryogenic cooling (8–10 K/min). Micro-crystallographic analysis confirmed heterogeneous hydride precipitation, which included significant hydrogen atom accumulation in LAGBs. Magneto-optical imaging analysis showed that these sites can then act as sites for both premature flux penetration and eventually flux trapping. However, this hydrogen related degradation at LAGBs did not completely disappear even after an 800 °C/2 h anneal typically used for hydrogen removal in SRF Nb cavities. These findings suggest that hydride precipitation at an LAGB is facilitated by a non-equilibrium concentration of vacancy-hydrogen (H) complexes aided by mechanical deformation and the hydride phase interferes with the recovery process under 800 °C annealing.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); State of Florida (United States); National Science Foundation (NSF)

Contributing Organization:: Michigan State Univ., East Lansing, MI (United States)

Grant/Contract Number:: SC0009960; FG02-13ER41973; DMR-1157490; AC02-07CH11359

OSTI ID:: 1361685

Alternate ID(s):: OSTI ID: 1361680; OSTI ID: 1361893; OSTI ID: 1371587

Report Number(s):: FERMILAB-PUB-17-222-TD

Journal Information:: Journal of Applied Physics, Vol. 121, Issue 19; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 13 works

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Cited By (2)

Revealing the role of nitrogen on hydride nucleation and stability in pure niobium using first-principles calculations Garg, P.; Balachandran, S.; Adlakha, I. Superconductor Science and Technology, Vol. 31, Issue 11 https://doi.org/10.1088/1361-6668/aae147	journal	October 2018
Revealing the role of nitrogen on hydride nucleation and stability in pure niobium using first principles calculations Garg, P.; Balachandran, S.; Adlakha, I. arXiv https://doi.org/10.48550/arxiv.1809.04044	text	January 2018

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36 MATERIALS SCIENCE
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Title: Development of low angle grain boundaries in lightly deformed superconducting niobium and their influence on hydride distribution and flux perturbation

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