scholarly journals Atomic structure of a grain boundary in a metallic alloy: Combined electron microscope and theoretical study

1991 ◽  
Vol 67 (14) ◽  
pp. 1894-1897 ◽  
Author(s):  
D. E. Luzzi ◽  
Min Yan ◽  
M. Šob ◽  
V. Vitek
Keyword(s):  
Electron Microscope ◽  
Grain Boundary ◽  
Atomic Structure ◽  
Theoretical Study ◽  
Metallic Alloy

Atomic structure of a Σ = 21 grain boundary

1990 ◽  
Vol 5 (11) ◽  
pp. 2658-2662 ◽  
Author(s):  
William Krakow
Keyword(s):  
Electron Microscope ◽  
Grain Boundary ◽  
Atomic Structure ◽  
Structural Unit ◽  
Defect Structures ◽  
Atomic Column ◽  
Unit Model ◽  
Tilt Grain Boundary

An electron microscope structure image of a σ = 21/[111] tilt grain boundary in Au was obtained and atomic column positions identified to yield a structural unit model of the interface consisting of repeating polyhedron shapes. This result represents the smallest projected spacings at a grain boundary containing defect structures imaged by an electron microscope and interpreted atomistically.

Morphology and atomic structure of segregated grain boundaries in Cu-Sb

1992 ◽  
Vol 50 (1) ◽  
pp. 254-255
Author(s):  
R. W. Fonda ◽  
D. E. Luzzi
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Intergranular Fracture ◽  
Atomic Structure ◽  
Copper Alloys ◽  
Polycrystalline Materials ◽  
Grain Boundary Embrittlement ◽  
Boundary Embrittlement

The properties of polycrystalline materials are strongly dependant upon the strength of internal boundaries. Segregation of solute to the grain boundaries can adversely affect this strength. In copper alloys, segregation of either bismuth or antimony to the grain boundary will embrittle the alloy by facilitating intergranular fracture. Very small quantities of bismuth in copper have long been known to cause severe grain boundary embrittlement of the alloy. The effect of antimony is much less pronounced and is observed primarily at lower temperatures. Even though moderate amounts of antimony are fully soluble in copper, concentrations down to 0.14% can cause grain boundary embrittlement.

ELECTRON MICROSCOPE STUDIES OF GRAIN BOUNDARY STRUCTURE IN CUBIC METALS

1975 ◽  
Vol 36 (C4) ◽  
pp. C4-17-C4-22 ◽  
Author(s):  
R. W. BALLUFFI ◽  
P. J. GOODHEW ◽  
T. Y. TAN ◽  
W. R. WAGNER
Keyword(s):  
Electron Microscope ◽  
Grain Boundary ◽  
Boundary Structure ◽  
Cubic Metals ◽  
Grain Boundary Structure

Segregation of H, C and B to Σ = 5 (0 1 3) α-Fe grain boundary: A theoretical study

2006 ◽  
Vol 253 (4) ◽  
pp. 1939-1945 ◽  
Author(s):  
S. Gesari ◽  
B. Irigoyen ◽  
A. Juan
Keyword(s):  
Grain Boundary ◽  
Theoretical Study

Atomic structure and defect energetics of LiCoO2 grain boundary

2016 ◽  
Vol 82 ◽  
pp. 81-86 ◽  
Author(s):  
Hak-Sung Lee ◽  
Chanbum Park ◽  
Chang-Seok Oh ◽  
Hun-Seok Lee ◽  
HyangIm Seo ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Atomic Structure

Improvement of Superplasticity in Fine-Grained Oxide Ceramics Based on the Concept of Grain Boundary Plasticity

2016 ◽  
Vol 838-839 ◽  
pp. 34-40
Author(s):  
Hidehiro Yoshida ◽  
Koji Morita ◽  
Byung Nam Kim ◽  
Koji Matsui ◽  
Yuichi Ikuhara ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Atomic Structure ◽  
Nucleation And Growth ◽  
Phenomenological Analysis ◽  
Research Field ◽  
Oxide Ceramics ◽  
Cavity Nucleation ◽  
Fine Grained ◽  
Experimental Strain ◽  
New Research

Superplasticity in fine-grained oxide ceramics has been generally elucidated on the basis of their experimental strain rate-flow stress relationship and phenomenological analysis of cavity nucleation and growth. It has been widely accepted that the high temperature superplastic flow and failure in ceramics is significantly influenced by the atomic structure and chemistry of grain boundaries. Such phenomenon cannot be explained based on the classical phenomenological analysis. Our research group has therefore proposed to establish a new research field, grain boundary plasticity, to describe the superplastic deformation related to the grain boundary atomic structure. This paper aims to point out the importance of the atomistic analysis of grain boundary to develop new superplastic ceramics.

scholarly journals Spin-filter state of Au-Co nanowires

2018 ◽  
Vol 185 ◽  
pp. 01019
Author(s):  
Ekaterina Smelova ◽  
Kseniya Tsysar ◽  
Alexander Saletsky
Keyword(s):  
Bias Voltage ◽  
Atomic Structure ◽  
Spin Transport ◽  
Theoretical Study ◽  
Transmission Spectra ◽  
Spin Filter ◽  
Quantum Conductance ◽  
One Dimensional ◽  
Control Capability ◽  
Co Nanowires

Our theoretical study reveals the dependence of quantum conductance of Au-Co nanowires on their atomic structure. The results show the emergence of spin-filter state in one-dimensional Au-Co bimetallic nanowires. We found the existence of two transmission regime in Au-Co nanowires with low and high conductivity 1G0 and 2G0 for “zig-zag” and linear nanowire correspondingly. The study of transmission spectra of Au-Co nanowires reveals the control capability of spin transport regime by changing of bias voltage between bulk electrodes.

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