scholarly journals Exploring radiation induced segregation mechanisms at grain boundaries in equiatomic CoCrFeNiMn high entropy alloy under heavy ion irradiation

2018 ◽  
Vol 156 ◽  
pp. 80-84 ◽  
Author(s):  
Christopher M. Barr ◽  
James E. Nathaniel ◽  
Kinga A. Unocic ◽  
Junpeng Liu ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Heavy Ion Irradiation ◽  
Radiation Induced

Swift heavy ion irradiation of ZnO nanoparticles embedded in silica: Radiation-induced deoxidation and shape elongation

2013 ◽  
Vol 103 (20) ◽  
pp. 203106 ◽  
Author(s):  
H. Amekura ◽  
N. Okubo ◽  
N. Ishikawa ◽  
D. Tsuya ◽  
K. Mitsuishi ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Swift Heavy Ion Irradiation ◽  
Heavy Ion Irradiation ◽  
Swift Heavy Ion ◽  
Radiation Induced

scholarly journals NADPH Oxidase Activation Contributes to Heavy Ion Irradiation–Induced Cell Death

Dose-Response ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 155932581769969 ◽  
Author(s):  
Yupei Wang ◽  
Qing Liu ◽  
Weiping Zhao ◽  
Xin Zhou ◽  
Guoying Miao ◽  
...  
Keyword(s):  
Cell Death ◽  
Nadph Oxidase ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Ros Generation ◽  
Heavy Ion Irradiation ◽  
Radiation Induced ◽  
Heavy Ion Radiation ◽  
Nox Family ◽  
Nadph Oxidase Activation

Increased oxidative stress plays an important role in heavy ion radiation–induced cell death. The mechanism involved in the generation of elevated reactive oxygen species (ROS) is not fully illustrated. Here we show that NADPH oxidase activation is closely related to heavy ion radiation–induced cell death via excessive ROS generation. Cell death and cellular ROS can be greatly reduced in irradiated cancer cells with the preincubation of diphenyleneiodium, an inhibitor of NADPH oxidase. Most of the NADPH oxidase (NOX) family proteins (NOX1, NOX2, NOX3, NOX4, and NOX5) showed increased expression after heavy ion irradiation. Meanwhile, the cytoplasmic subunit p47phox was translocated to the cell membrane and localized with NOX2 to form reactive NADPH oxidase. Our data suggest for the first time that ROS generation, as mediated by NADPH oxidase activation, could be an important contributor to heavy ion irradiation–induced cell death.

Effect of Cascade Remnants on Freely Migrating Defects in Cu -1 % Au Alloys

1995 ◽  
Vol 396 ◽  
Author(s):  
A. Iwase ◽  
L. E. Rehn ◽  
P. M. Baldo ◽  
L. Funk
Keyword(s):  
Heavy Ions ◽  
Ion Irradiation ◽  
Ion Beam ◽  
Heavy Ion ◽  
The Other ◽  
Inert Gas ◽  
Heavy Ion Irradiation ◽  
Simultaneous Irradiation ◽  
Radiation Induced ◽  
Cu Ions

AbstractThe effects of cascade remnants on Freely Migrating Defects (FMD) were studied by measuring Radiation-Induced Segregation (RIS) in Cu-l%Au at 400°C during simultaneous irradiation with 1.5-MeV He and (400-800)-keV heavy ions (Ne, Ar or Cu). The large RIS observed during 1.5-MeV He-only irradiation was dramatically suppressed under simultaneous heavy ion irradiation. For Cu simultaneous irradiation, the suppression disappeared immediately after the Cu irradiation ceased, while for simultaneous inert gas (Ne or Ar) irradiation, the suppression persisted after the ion beam was turned off. These results demonstrate that the displacement cascades created by heavy ions introduce additional annihilation sites, which reduce the steady-state FMD concentrations. As the cascade remnants produced by Cu ions are thermally unstable at 400°C, the RIS suppression occurs only during simultaneous irradiation. On the other hand, the inert gas atoms which accumulate in the specimen apparently stabilize the cascade remnants, allowing the suppression to persist.

scholarly journals Effects of Heavy-Ion Irradiation on Microstructure of V-4Cr-4Ti Alloy at Moderate Temperatures

1996 ◽  
Vol 439 ◽  
Author(s):  
J. Gazda ◽  
H. M. Chung ◽  
B. A. Loomis ◽  
M. Meshii
Keyword(s):  
Grain Boundaries ◽  
Fast Neutron ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Test Facility ◽  
Attractive Alternative ◽  
Irradiation Embrittlement ◽  
Heavy Ion Irradiation ◽  
Dominant Feature ◽  
Structural Applications

AbstractV-4 wt.% Cr-4 wt.% Ti alloy is a promising candidate material for first-wall and structural applications in magnetic fusion reactors. In the past, fast neutron sources were used to evaluate postirradiation properties of fusion candidate materials. The recent shutdowns of the Fast Flux Test Facility (FFTF) and the Experimental Breeder Reactor (EBR-II) left U.S. researchers without local experimental facilities for such tests. Under such circumstances, ease of experimental control, availability, and relatively low cost make heavy-ion irradiation an attractive alternative, provided its limitations are appreciated. We selected 3-MeV V+ and 4.5-MeV Ni++ ions to investigate the effects of irradiation on the microstructure of V-4Cr-4Ti alloy in the temperature range of 200 – 420°C. The main interest is in the evaluation of this alloy's dimensional stability and susceptibility to irradiation embrittlement. In this paper, we report results of ion irradiation experiments and compare them with available data on fast-neutron irradiation. From transmission electron microscopy (TEM) analysis of ion-irradiated specimens, we found that the dominant feature of the postirradiation microstructure was a high density of dislocation loops and pointdefect clusters. Density and defect size depended on irradiation dose and temperature. Precipitates and voids/bubbles were not observed, even in specimens that were simultaneously injected with He and exposed to heavy-ion irradiation. Increased transport of point defects to internal interfaces was observed, as manifested by defect denuded zones along grain boundaries, Defect denuded zones along grain boundaries could lead to segregation of impurities and solutes and formation of precipitates on grain boundaries.

Irradiation damage and swelling of carbon-doped Fe38Mn40Ni11Al4Cr7 high-entropy alloys under heavy ion irradiation at elevated temperature

2020 ◽  
Vol 55 (36) ◽  
pp. 17218-17231
Author(s):  
Shangkun Shen ◽  
Feida Chen ◽  
Xiaobin Tang ◽  
Guojia Ge ◽  
Jing Gao ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Irradiation Damage ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Carbon Doped ◽  
Heavy Ion Irradiation

Radiation-induced disorder in compressed lanthanide zirconates

2018 ◽  
Vol 20 (9) ◽  
pp. 6187-6197 ◽  
Author(s):  
Sulgiye Park ◽  
Cameron L. Tracy ◽  
Fuxiang Zhang ◽  
Changyong Park ◽  
Christina Trautmann ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Stability ◽  
Electronic Excitation ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Swift Heavy Ion Irradiation ◽  
Heavy Ion Irradiation ◽  
Swift Heavy Ion ◽  
Radiation Induced ◽  
Pressure Phase

Swift heavy ion irradiation induces nanoscale defects by dense electronic excitation, which change the high-pressure phase stability fields of A2Zr2O7.

Statistical model for radiation-induced wear-out of ultra-thin gate oxides after exposure to heavy ion irradiation

2003 ◽  
Vol 50 (6) ◽  
pp. 2167-2175 ◽  
Author(s):  
A. Cester ◽  
S. Cimino ◽  
E. Miranda ◽  
A. Candelori ◽  
G. Ghidini ◽  
...  
Keyword(s):  
Statistical Model ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Gate Oxides ◽  
Heavy Ion Irradiation ◽  
Radiation Induced

Effect of heavy ion irradiation in RbKBrCl quaternary system: EPR study of radiation induced defects

2001 ◽  
Vol 154 (2) ◽  
pp. 141-149 ◽  
Author(s):  
D. Pathinettam Padiyan ◽  
C. Muthukrishnan ◽  
S. John Ethilton ◽  
S. K. Mohanlal ◽  
S. Dhanuskodi ◽  
...  
Keyword(s):  
Quaternary System ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Heavy Ion Irradiation ◽  
Radiation Induced ◽  
Induced Defects

Sound velocity of glassy Pd 80 Si 20 after heavy-ion irradiation at low temperatures

2002 ◽  
Vol 82 (11) ◽  
pp. 2333-2339
Author(s):  
G. Schumacher ◽  
R. C. Birtcher ◽  
D. P. Renusch ◽  
M. Grimsditch ◽  
L. E. Rehn
Keyword(s):  
Sound Velocity ◽  
Low Temperatures ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Heavy Ion Irradiation
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