Strength enhancement of nanocrystalline tungsten under high pressure

Yang Jing; Deng Wen; Li Qiang; Li Xin; Liang Akun; Su Yuzhu; Guan Shixue; Wang Junpu; He Duanwei

doi:10.1063/5.0005395

Volume 5 Issue 5

Sep. 2020

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Yang Jing, Deng Wen, Li Qiang, Li Xin, Liang Akun, Su Yuzhu, Guan Shixue, Wang Junpu, He Duanwei. Strength enhancement of nanocrystalline tungsten under high pressure[J]. Matter and Radiation at Extremes, 2020, 5(5): 058401. doi: 10.1063/5.0005395

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Yang Jing, Deng Wen, Li Qiang, Li Xin, Liang Akun, Su Yuzhu, Guan Shixue, Wang Junpu, He Duanwei. Strength enhancement of nanocrystalline tungsten under high pressure[J]. Matter and Radiation at Extremes, 2020, 5(5): 058401. doi: 10.1063/5.0005395

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Strength enhancement of nanocrystalline tungsten under high pressure

doi: 10.1063/5.0005395

1.
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
2.
Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
3.
Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610065, China

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Corresponding author: a)Author to whom correspondence should be addressed: duanweihe@scu.edu.cn
Received Date: 2020-03-06
Accepted Date: 2020-08-03

Available Online: 2020-09-01

Publish Date: 2020-09-15

Abstract

Abstract

Three tungsten powder samples—one coarse grained (c-W; grain size: 1 µm–3 µm) and two nanocrystalline (n-W; average grain sizes: 10 nm and 50 nm)—are investigated under nonhydrostatic compression in a diamond anvil cell in separate experiments, and their in situ X-ray diffraction patterns are recorded. The maximum microscopic deviatoric stress in each tungsten sample, a measure of the yield strength, is determined by analyzing the diffraction line width. Over the entire pressure range, the strength of tungsten increases noticeably as the grain size is decreased from 1 µm–3 µm to 10 nm. The results show that the yield strength of tungsten with an average crystal size of 10 nm is around 3.5 times that of the sample with a grain size of 1 µm–3 µm.

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