Transformation of Positron Trapping Parameters Caused by Water Molecules in Voids Near Grain Boundaries in MgAl2O4 Ceramics

2019 ◽  
Author(s):  
Halyna Klym ◽  
Adam Ingram ◽  
Roman Szatanik
Keyword(s):  
Grain Boundaries ◽  
Water Molecules ◽  
Positron Trapping

Anomalous diffusion of water molecules at grain boundaries in ice Ih

2018 ◽  
Vol 20 (20) ◽  
pp. 13944-13951 ◽  
Author(s):  
Pedro Augusto Franco Pinheiro Moreira ◽  
Roberto Gomes de Aguiar Veiga ◽  
Ingrid de Almeida Ribeiro ◽  
Rodrigo Freitas ◽  
Julian Helfferich ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Grain Boundaries ◽  
Anomalous Diffusion ◽  
First Principles ◽  
Water Molecules ◽  
Diffusive Behavior ◽  
Classical Molecular Dynamics ◽  
Dynamics Simulations

First-principles and classical molecular dynamics simulations show that diffusion of water molecules at pre-melted grain boundaries in ice is glassy-like, showing sub-diffusive behavior.

Positron trapping at grain boundaries

1982 ◽  
Vol 27 (3) ◽  
pp. 149-152 ◽  
Author(s):  
C. Hidalgo ◽  
N. Diego
Keyword(s):  
Grain Boundaries ◽  
Positron Trapping

Positron Trapping within the Grain and at Grain Boundaries in Sintered Alumina of High Impurity Content

2004 ◽  
Vol 445-446 ◽  
pp. 177-179 ◽  
Author(s):  
A. Si Ahmed ◽  
Jerzy Kansy ◽  
Kamel Zarbout ◽  
Gérard Moya ◽  
Dominique Gœuriot
Keyword(s):  
Grain Boundaries ◽  
Impurity Content ◽  
Positron Trapping ◽  
High Impurity

Positron-trapping mechanism at grain boundaries

1985 ◽  
Vol 31 (11) ◽  
pp. 6941-6946 ◽  
Author(s):  
C. Hidalgo ◽  
N. de Diego ◽  
F. Plazaola
Keyword(s):  
Grain Boundaries ◽  
Trapping Mechanism ◽  
Positron Trapping

Temperature dependence of positron trapping at grain boundaries

1997 ◽  
Vol 9 (31) ◽  
pp. 6749-6759 ◽  
Author(s):  
S Aina ◽  
A Dupasquier ◽  
P Folegati ◽  
N De Diego ◽  
J del Rio ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Grain Boundaries ◽  
Positron Trapping

Positron Trapping Effection at the Grain Boundaries of Fe73.5Cu1Nb3Si13.5B9 Nanocrystalline Alloys

1994 ◽  
Vol 175-178 ◽  
pp. 605-608
Author(s):  
Ya Zen Zhang ◽  
Li Jun Wang ◽  
Lin Hua Zhe ◽  
Zi Bin Zhou
Keyword(s):  
Grain Boundaries ◽  
Nanocrystalline Alloys ◽  
Positron Trapping

Positron trapping at grain boundaries

1993 ◽  
Vol 48 (13) ◽  
pp. 9235-9245 ◽  
Author(s):  
A. Dupasquier ◽  
R. Romero ◽  
A. Somoza
Keyword(s):  
Grain Boundaries ◽  
Positron Trapping

Morphology, Distribution and Identification of Micro-Constituents Along Grain Boundaries in Nickel-Base Alloys

1973 ◽  
Vol 31 ◽  
pp. 176-177
Author(s):  
D. E. Fornwalt ◽  
A. R. Geary ◽  
B. H. Kear
Keyword(s):  
Electron Microscope ◽  
Grain Boundaries ◽  
Volume Fraction ◽  
Rupture Life ◽  
Stress Rupture ◽  
High Volume ◽  
Precipitate Morphology ◽  
Stress Rupture Life ◽  
Nickel Base ◽  
Scanning Electron

A systematic study has been made of the effects of various heat treatments on the microstructures of several experimental high volume fraction γ’ precipitation hardened nickel-base alloys, after doping with ∼2 w/o Hf so as to improve the stress rupture life and ductility. The most significant microstructural chan§e brought about by prolonged aging at temperatures in the range 1600°-1900°F was the decoration of grain boundaries with precipitate particles.Precipitation along the grain boundaries was first detected by optical microscopy, but it was necessary to use the scanning electron microscope to reveal the details of the precipitate morphology. Figure 1(a) shows the grain boundary precipitates in relief, after partial dissolution of the surrounding γ + γ’ matrix.

Measurement of the Displacement Across a Coincidence Grain Boundary

1977 ◽  
Vol 35 ◽  
pp. 124-125
Author(s):  
J. W. Matthews ◽  
W. M. Stobbs
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Stacking Fault ◽  
The Other ◽  
Measuring Technique ◽  
High Angle ◽  
Twin Boundaries ◽  
Rigid Displacement ◽  
Cubic Crystals ◽  
Lattice Displacement

Many high-angle grain boundaries in cubic crystals are thought to be either coincidence boundaries (1) or coincidence boundaries to which grain boundary dislocations have been added (1,2). Calculations of the arrangement of atoms inside coincidence boundaries suggest that the coincidence lattice will usually not be continuous across a coincidence boundary (3). There will usually be a rigid displacement of the lattice on one side of the boundary relative to that on the other. This displacement gives rise to a stacking fault in the coincidence lattice.Recently, Pond (4) and Smith (5) have measured the lattice displacement at coincidence boundaries in aluminum. We have developed (6) an alternative to the measuring technique used by them, and have used it to find two of the three components of the displacement at {112} lateral twin boundaries in gold. This paper describes our method and presents a brief account of the results we have obtained.

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