An exploratory study on helium mobility in amorphous and crystallized bulk metallic glasses

J. Brechtl; S. Agarwal; X. Hu; D. Chen; M. Chancey; H. Bei; Y. Q. Wang; S. J. Zinkle

doi:10.1016/j.jnucmat.2020.152617

An exploratory study on helium mobility in amorphous and crystallized bulk metallic glasses

J. Brechtl, S. Agarwal, X. Hu, D. Chen, M. Chancey, H. Bei, Y. Q. Wang, S. J. Zinkle

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Abstract

Zr_52.5Cu_17.9Ni_14.6Al₁₀Ti₅ and Cu₆₀Zr₂₀Hf₁₀Ti₁₀ amorphous and crystallized bulk metallic glasses (BMGs) were implanted at room temperature by 150 keV ³He⁺ ions to fluences of 2 × 10¹⁵ cm^-2 and 5 × 10¹⁵ cm^-2, producing peak implanted He concentrations of ~1,100 and 3,500 appm, respectively. Nuclear reaction analysis (NRA) performed on post-implantation annealed samples at various temperatures between 250 and 600 °C (~0.30 to 0.75 of the absolute melting temperature T_m of the BMGs) revealed no appreciable He migration. Complementary thermal desorption spectroscopy (TDS) on as-implanted samples, which involved in situ annealing, showed appreciable He release only at temperatures higher than ~700 °C (~0.76-0.90 T_m) in all the samples. Half or more of the implanted He did not desorb up to the maximum investigated TDS annealing temperature of 770 °C (~0.85-0.97 T_m). The lack of pronounced He diffusion up to 600 °C as observed from the NRA and TDS data was attributed to He trapping in free volume sites present in the BMGs, which seems to play a similar role to vacancies in crystalline materials. It was also observed that in both the amorphous and crystallized forms of the Zr BMG, the sample implanted to the lower fluence released more He as compared to the sample implanted with a higher fluence. The crystalline forms of both the Cu and Zr BMGs released more He as compared to their amorphous counterparts.

Original language	English
Article number	152617
Journal	Journal of Nuclear Materials
Volume	543
DOIs	https://doi.org/10.1016/j.jnucmat.2020.152617
State	Published - Jan 2021

Funding

This research was sponsored in part by the Office of Fusion Energy Sciences, U.S. Department of Energy under contract DE-AC05-00OR22725 with UT-Battelle, LLC and grant # DE-SC0006661 with the University of Tennessee. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE), Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security administration of the U.S. Department of Energy under Contract No. DE-AC52-6NA25396. This research was sponsored in part by the Office of Fusion Energy Sciences, U.S. Department of Energy under contract DE-AC05-00OR22725 with UT-Battelle, LLC and grant # DE-SC0006661 with the University of Tennessee. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE), Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security administration of the U.S. Department of Energy under Contract No. DE-AC52-6NA25396.

Keywords

Bulk metallic glasses
Helium mobility
Nuclear Reaction Analysis
Thermal Desorption Spectroscopy

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10.1016/j.jnucmat.2020.152617

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title = "An exploratory study on helium mobility in amorphous and crystallized bulk metallic glasses",

abstract = "Zr52.5Cu17.9Ni14.6Al10Ti5 and Cu60Zr20Hf10Ti10 amorphous and crystallized bulk metallic glasses (BMGs) were implanted at room temperature by 150 keV 3He+ ions to fluences of 2 × 1015 cm-2 and 5 × 1015 cm-2, producing peak implanted He concentrations of ~1,100 and 3,500 appm, respectively. Nuclear reaction analysis (NRA) performed on post-implantation annealed samples at various temperatures between 250 and 600 °C (~0.30 to 0.75 of the absolute melting temperature Tm of the BMGs) revealed no appreciable He migration. Complementary thermal desorption spectroscopy (TDS) on as-implanted samples, which involved in situ annealing, showed appreciable He release only at temperatures higher than ~700 °C (~0.76-0.90 Tm) in all the samples. Half or more of the implanted He did not desorb up to the maximum investigated TDS annealing temperature of 770 °C (~0.85-0.97 Tm). The lack of pronounced He diffusion up to 600 °C as observed from the NRA and TDS data was attributed to He trapping in free volume sites present in the BMGs, which seems to play a similar role to vacancies in crystalline materials. It was also observed that in both the amorphous and crystallized forms of the Zr BMG, the sample implanted to the lower fluence released more He as compared to the sample implanted with a higher fluence. The crystalline forms of both the Cu and Zr BMGs released more He as compared to their amorphous counterparts.",

keywords = "Bulk metallic glasses, Helium mobility, Nuclear Reaction Analysis, Thermal Desorption Spectroscopy",

author = "J. Brechtl and S. Agarwal and X. Hu and D. Chen and M. Chancey and H. Bei and Wang, {Y. Q.} and Zinkle, {S. J.}",

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doi = "10.1016/j.jnucmat.2020.152617",

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AU - Brechtl, J.

AU - Agarwal, S.

AU - Hu, X.

AU - Chen, D.

AU - Chancey, M.

AU - Bei, H.

AU - Wang, Y. Q.

AU - Zinkle, S. J.

PY - 2021/1

Y1 - 2021/1

N2 - Zr52.5Cu17.9Ni14.6Al10Ti5 and Cu60Zr20Hf10Ti10 amorphous and crystallized bulk metallic glasses (BMGs) were implanted at room temperature by 150 keV 3He+ ions to fluences of 2 × 1015 cm-2 and 5 × 1015 cm-2, producing peak implanted He concentrations of ~1,100 and 3,500 appm, respectively. Nuclear reaction analysis (NRA) performed on post-implantation annealed samples at various temperatures between 250 and 600 °C (~0.30 to 0.75 of the absolute melting temperature Tm of the BMGs) revealed no appreciable He migration. Complementary thermal desorption spectroscopy (TDS) on as-implanted samples, which involved in situ annealing, showed appreciable He release only at temperatures higher than ~700 °C (~0.76-0.90 Tm) in all the samples. Half or more of the implanted He did not desorb up to the maximum investigated TDS annealing temperature of 770 °C (~0.85-0.97 Tm). The lack of pronounced He diffusion up to 600 °C as observed from the NRA and TDS data was attributed to He trapping in free volume sites present in the BMGs, which seems to play a similar role to vacancies in crystalline materials. It was also observed that in both the amorphous and crystallized forms of the Zr BMG, the sample implanted to the lower fluence released more He as compared to the sample implanted with a higher fluence. The crystalline forms of both the Cu and Zr BMGs released more He as compared to their amorphous counterparts.

AB - Zr52.5Cu17.9Ni14.6Al10Ti5 and Cu60Zr20Hf10Ti10 amorphous and crystallized bulk metallic glasses (BMGs) were implanted at room temperature by 150 keV 3He+ ions to fluences of 2 × 1015 cm-2 and 5 × 1015 cm-2, producing peak implanted He concentrations of ~1,100 and 3,500 appm, respectively. Nuclear reaction analysis (NRA) performed on post-implantation annealed samples at various temperatures between 250 and 600 °C (~0.30 to 0.75 of the absolute melting temperature Tm of the BMGs) revealed no appreciable He migration. Complementary thermal desorption spectroscopy (TDS) on as-implanted samples, which involved in situ annealing, showed appreciable He release only at temperatures higher than ~700 °C (~0.76-0.90 Tm) in all the samples. Half or more of the implanted He did not desorb up to the maximum investigated TDS annealing temperature of 770 °C (~0.85-0.97 Tm). The lack of pronounced He diffusion up to 600 °C as observed from the NRA and TDS data was attributed to He trapping in free volume sites present in the BMGs, which seems to play a similar role to vacancies in crystalline materials. It was also observed that in both the amorphous and crystallized forms of the Zr BMG, the sample implanted to the lower fluence released more He as compared to the sample implanted with a higher fluence. The crystalline forms of both the Cu and Zr BMGs released more He as compared to their amorphous counterparts.

KW - Bulk metallic glasses

KW - Helium mobility

KW - Nuclear Reaction Analysis

KW - Thermal Desorption Spectroscopy

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An exploratory study on helium mobility in amorphous and crystallized bulk metallic glasses

Abstract

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Keywords

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