Nanobubble Fragmentation and Bubble-Free-Channel Shear Localization in Helium-Irradiated Submicron-Sized Copper
Name
PhysRevLett.117.215501.pdf
Size
1.5 MB
Format
Adobe PDF
Checksum (MD5)
350ad331d04b460baf40fc9a854c6eea
Author(s)
Ding, Ming-Shuai
Tian, Lin
Han, Wei-Zhong
Ma, Evan
Shan, Zhi-Wei
Li, Ju
Date Issued
November 2016
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Ding, Ming-Shuai; Tian, Lin; Han, Wei-Zhong; Li, Ju; Ma, Evan and Shan, Zhi-Wei. "Nanobubble Fragmentation and Bubble-Free-Channel Shear Localization in Helium-Irradiated Submicron-Sized Copper." Physical Review Letters 117, 215501: 1-5 © 2016 American Physical Society
Version
Final published version
Abstract
Helium bubbles are one of the typical radiation microstructures in metals and alloys, significantly influencing their deformation behavior. However, the dynamic evolution of helium bubbles under straining is less explored so far. Here, by using in situ micromechanical testing inside a transmission electron microscope, we discover that the helium bubble not only can coalesce with adjacent bubbles, but also can split into several nanoscale bubbles under tension. Alignment of the splittings along a slip line can create a bubble-free channel, which appears softer, promotes shear localization, and accelerates the failure in the shearing-off mode. Detailed analyses unveil that the unexpected bubble fragmentation is mediated by the combination of dislocation cutting and internal surface diffusion, which is an alternative microdamage mechanism of helium irradiated copper besides the bubble coalescence.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.117.215501
