scholarly journals Atomistic study on helium-to-vacancy ratio of neutron irradiation induced helium bubbles during nucleation and growth in α-Fe

2021 ◽  
Vol 26 ◽  
pp. 100940
Author(s):  
Jingyi Shi ◽  
Liuliu Li ◽  
Lei Peng ◽  
Fei Gao ◽  
Jianjun Huang
Keyword(s):  
Neutron Irradiation ◽  
Nucleation And Growth ◽  
Helium Bubbles ◽  
Atomistic Study

The morphology of interstitial aggregates in iron

1968 ◽  
Vol 305 (1483) ◽  
pp. 541-552 ◽  
Keyword(s):  
Low Temperature ◽  
Neutron Irradiation ◽  
Nucleation And Growth ◽  
Atom Model ◽  
Final Orientation

A discrete atom model is described for body-centred cubic iron and used to investigate the nucleation and growth of interstitial aggregates. The results provide a consistent explanation of the origin and final orientation of the interstitial loops observed after low-temperature neutron irradiation in α-iron.

scholarly journals Nucleation and growth of helium bubbles in aluminum between 20 and 900 K

1988 ◽  
Vol 38 (2) ◽  
pp. 1087-1094 ◽  
Author(s):  
H. Rajainmäki ◽  
S. Linderoth ◽  
H. E. Hansen ◽  
R. M. Nieminen ◽  
M. D. Bentzon
Keyword(s):  
Nucleation And Growth ◽  
Helium Bubbles

Evolution of helium bubbles below different tungsten surfaces under neutron irradiation and non-irradiation conditions

2018 ◽  
Vol 148 ◽  
pp. 242-248 ◽  
Author(s):  
Guo Wei ◽  
Feng Ren ◽  
Wenjing Qin ◽  
Wangyu Hu ◽  
Huiqiu Deng ◽  
...  
Keyword(s):  
Neutron Irradiation ◽  
Helium Bubbles

scholarly journals An Overview of Recent Standard and Accelerated Molecular Dynamics Simulations of Helium Behavior in Tungsten

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2500 ◽  
Author(s):  
Luis Sandoval ◽  
Danny Perez ◽  
Blas P. Uberuaga ◽  
Arthur F. Voter
Keyword(s):  
Molecular Dynamics ◽  
Nucleation And Growth ◽  
High Melting ◽  
High Melting Point ◽  
Fusion Power ◽  
Helium Bubbles ◽  
Accelerated Molecular Dynamics ◽  
Plasma Facing Materials ◽  
Sputtering Yield ◽  
Dynamics Simulations

One of the most critical challenges for the successful adoption of nuclear fusion power corresponds to plasma-facing materials. Due to its favorable properties in this context (low sputtering yield, high thermal conductivity, high melting point, among others), tungsten is a leading candidate material. Nevertheless, tungsten is affected by the plasma and fusion byproducts. Irradiation by helium nuclei, in particular, strongly modifies the surface structure by a synergy of processes, whose origin is the nucleation and growth of helium bubbles. In this review, we present recent advances in the understanding of helium effects in tungsten from a simulational approach based on accelerated molecular dynamics, which emphasizes the use of realistic parameters, as are expected in experimental and operational fusion power conditions.

Atomistic Study of Helium Bubbles in Fe: Equilibrium State

2011 ◽  
Vol 1298 ◽  
Author(s):  
David M. Stewart ◽  
Yury N. Osetskiy ◽  
Roger E. Stoller
Keyword(s):  
Equilibrium State ◽  
Bubble Size ◽  
Temperature Effects ◽  
Room Temperature ◽  
Neutron Radiation ◽  
Equilibrium Pressure ◽  
Helium Bubbles ◽  
Body Potential ◽  
Atomistic Study ◽  
Neutron Radiation Damage

ABSTRACTIn the fusion irradiation environment, helium created by transmutation will play an important role in the response of structural materials to neutron radiation damage. Recently we have developed a new 3-body potential to describe the Fe–He interaction in an Fe matrix. We have used this potential to investigate the equilibrium state of He bubbles embedded into the bcc Fe matrix. We have investigated bubble size, He content and temperature effects. It was found that the equilibrium He content is rather low and at a room temperature it is ~0.38 to 0.5 He per vacancy for bubble diameters from 1 to 6 nm. At constant bubble size, the equilibrium He/vacancy ratio decreases with temperature increase. For bubbles of 6 nm diameter it goes down as low as ~0.25 at 900K. The results are compared with the capillarity model often used for estimating the equilibrium pressure of He bubbles.

Atomistic study of small helium bubbles in plutonium

2007 ◽  
Vol 444-445 ◽  
pp. 300-304 ◽  
Author(s):  
B.Y. Ao ◽  
X.L. Wang ◽  
W.Y. Hu ◽  
J.Y. Yang ◽  
J.X. Xia
Keyword(s):  
Helium Bubbles ◽  
Atomistic Study
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