Study of Helium Diffusion to Grain Boundaries by the Method of Internal Friction

2009 ◽  
pp. 650-650-7
Author(s):  
EU Grinik ◽  
VS Karasev ◽  
YP Melnik-Kutsin ◽  
EN Litvinenko
Keyword(s):  
Internal Friction ◽  
Grain Boundaries ◽  
Helium Diffusion

Helium diffusion along wetted grain boundaries in sodium chloride

2013 ◽  
Vol 75 (6) ◽  
pp. 747-749 ◽  
Author(s):  
V. Yu. Traskin ◽  
Z. N. Skvortsova ◽  
M. I. Nikitin ◽  
D. N. Zubov ◽  
E. V. Porodenko
Keyword(s):  
Sodium Chloride ◽  
Grain Boundaries ◽  
Helium Diffusion

scholarly journals The Internal Friction of Single Crystals, Bicrystals and Polycrystals of Pure Magnesium

2015 ◽  
Vol 60 (1) ◽  
pp. 371-375 ◽  
Author(s):  
W.B. Jiang ◽  
Q.P. Kong ◽  
L.B. Magalas ◽  
Q.F. Fang
Keyword(s):  
Activation Energy ◽  
Internal Friction ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Room Temperature ◽  
Internal Friction Peak ◽  
Self Diffusion ◽  
Boundary Relaxation ◽  
The Difference

Abstract The internal friction of magnesium single crystals, bicrystals and polycrystals has been studied between room temperature and 450°C. There is no internal friction peak in the single crystals, but a prominent relaxation peak appears at around 160°C in polycrystals. The activation energy of the peak is 1.0 eV, which is consistent with the grain boundary self-diffusion energy of Mg. Therefore, the peak in polycrystals can be attributed to grain boundary relaxation. For the three studied bicrystals, the grain boundary peak temperatures and activation energies are higher than that of polycrystals, while the peak heights are much lower. The difference between the internal friction peaks in bicrystals and polycrystals is possibly caused by the difference in the concentrations of segregated impurities in grain boundaries.

Helium Migration Mechanisms in Polycrystalline Uranium Dioxide

2006 ◽  
Vol 985 ◽  
Author(s):  
Guillaume Martin ◽  
Pierre Desgardin ◽  
Philippe Garcia ◽  
Thierry Sauvage ◽  
Gaëlle Carlot ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Nuclear Reaction ◽  
Uranium Dioxide ◽  
Nuclear Reaction Analysis ◽  
Annealing Stage ◽  
Depth Profiles ◽  
Release Mechanisms ◽  
Helium Diffusion

AbstractThis study aims at identifying the release mechanisms of helium in uranium dioxide. Two sets of polycrystalline UO2 sintered samples presenting different microstructures were implanted with 3He ions at concentrations in the region of 0.1 at.%. Changes in helium concentrations were monitored using two Nuclear Reaction Analysis (NRA) techniques based on the 3He(d,α)1H reaction. 3He release is measured in-situ during sample annealing at temperatures ranging between 700°C and 1000°C. Accurate helium depth profiles are generated after each annealing stage. Results that provide data for further understanding helium release mechanisms are discussed. It is found that helium diffusion appears to be enhanced above 900°C in the vicinity of grain boundaries possibly as a result of the presence of defects.

Internal friction in Al bicrystals with ⟨111⟩ tilt and twist grain boundaries

2010 ◽  
Vol 90 (6) ◽  
pp. 753-764 ◽  
Author(s):  
W.B. Jiang ◽  
Q.P. Kong ◽  
P. Cui ◽  
Q.F. Fang ◽  
D.A. Molodov ◽  
...  
Keyword(s):  
Internal Friction ◽  
Grain Boundaries

Internal friction associated with grain boundaries in NiCr alloys

1994 ◽  
Vol 211-212 ◽  
pp. 118-123 ◽  
Author(s):  
B. Cao ◽  
R. Schaller ◽  
W. Benoit ◽  
F. Cosandey
Keyword(s):  
Internal Friction ◽  
Grain Boundaries

scholarly journals Internal Friction Behavior of Alumina Polycrystals with Engineered Grain Boundaries

2002 ◽  
Vol 43 (7) ◽  
pp. 1557-1560 ◽  
Author(s):  
Kazumi Nakagawa ◽  
Giuseppe Pezzotti ◽  
Ken’ichi Ota ◽  
Yuichi Ikuhara ◽  
Hidehiro Yoshida ◽  
...  
Keyword(s):  
Internal Friction ◽  
Grain Boundaries ◽  
Friction Behavior
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