Atomistic simulations to study the effect of helium nanobubble on the shear deformation of nickel crystal

So far, many theoretical and experimental studies have investigated the detrimental effect of helium nanobubble on the mechanical properties of nuclear structural materials. In this article, efforts have been made to study the effect of helium nanobubble on the onset of plastic deformation in a sing...

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Bibliographic Details
Published in:Journal of nuclear materials Vol. 557; p. 153245
Main Authors: Sharma, Abhinav Kumar, Sharma, Saurabh S, Singh, Sandeep Kumar, Parashar, Avinash
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 15.12.2021
Elsevier BV
Subjects:
Configurations
Crystal structure
Deformation
Deformation effects
Dislocations
Embrittlement
Helium
Helium atoms
Helium nanobubble
Life cycles
Mechanical properties
Molecular dynamics
Nickel
Nuclear reactors
Plastic deformation
Shear deformation
Shear forces
Single crystals
Slip planes
Strain hardening
Twinning
Shear deformation
Embrittlement
Molecular dynamics
Twinning
Helium nanobubble
Strain hardening
Dislocations
ISSN:0022-3115, 1873-4820
Online Access:Get full text
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Summary:So far, many theoretical and experimental studies have investigated the detrimental effect of helium nanobubble on the mechanical properties of nuclear structural materials. In this article, efforts have been made to study the effect of helium nanobubble on the onset of plastic deformation in a single crystal Ni. The onset of plastic deformation has been quantified as a function of the orientation of slip planes with shear force and configuration of helium nanobubbles. Two configurations were generated for helium nanobubble, one with radius fixed where the He to Ni vacancy ratio was varied. In contrast, the ratio was kept constant in another configuration, and the nanobubble radius was varied. From the simulation, it was predicted that irrespective of the orientation of Ni crystal with respect to shear forces, helium nanobubble has a detrimental effect on the mechanical properties of the single-crystal Ni. Compared to the size of helium nanobubble, the higher concentration of helium atoms in the nanobubble has a more detrimental effect on mechanical strength. The focus of nuclear scientists is to develop future generation nuclear reactors and predict the safe life cycle of existing nuclear structures, which are in use for a long time. Helium nanobubbles change the mechanical behavior of underlying nuclear material in an effective manner. The results presented in this article will help in developing a better understanding of the deformation in irradiated Ni crystal.
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ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2021.153245