Orientation effects in interaction of screw dislocation with interstitial impurity atom in b.c.c. lattice

1972 ◽  
Vol 22 (3) ◽  
pp. 204-214 ◽  
Author(s):  
J. Blahovec ◽  
L. Lejček
Keyword(s):  
Screw Dislocation ◽  
Impurity Atom ◽  
Interstitial Impurity ◽  
Orientation Effects

Dynamics of a Crystal with Interstitial Impurity Atom

1979 ◽  
Vol 47 (3) ◽  
pp. 883-888 ◽  
Author(s):  
Yoshiko H. Ohashi ◽  
Kazutoshi Ohashi
Keyword(s):  
Impurity Atom ◽  
Interstitial Impurity

Diffusion mechanism in cutting Ni-based alloy containing γ′ phase (Ni3Al) with CBN tool based on MD simulation

2021 ◽  
pp. 095440542110024
Author(s):  
YiHang Fan ◽  
WenYuan Wang ◽  
ZhaoPeng Hao
Keyword(s):  
Impurity Atom ◽  
Md Simulation ◽  
Diffusion Mechanism ◽  
Interstitial Impurity ◽  
Diffusion Activation Energy ◽  
Temperature Oxidation ◽  
Substitutional Impurity ◽  
Impurity Atoms ◽  
Cbn Tool ◽  
Cutting Model

Ni-based alloys are widely used in aerospace because of their high strength and high temperature oxidation resistance. CBN tool is suitable for precision machining of Ni-based alloy. Diffusion wear is an important wear form of CBN tool in the process of cutting Ni-based alloy. Therefore, it is of great significance to study the diffusion phenomenon in the process of cutting Ni-based alloy with CBN tool. In this paper, the cutting model of Ni-based alloy containing γ′ phase (Ni3Al) with CBN tool is established based on the molecular dynamics (MD) simulation method. The self diffusion activation energy of all kinds of atoms in the workpiece and the formation energy of several point defects in the tool are calculated, so as to study in depth the atom diffusion mechanism according to the simulation results. The results show that the atoms in the crystal boundary of the workpiece are the most easily diffused, followed by the atoms in the phase boundary, and the atoms in the lattice are the most difficult to diffuse. When the workpiece atoms diffuse into the tool, it is easier to diffuse into the tool grain boundary than to form interstitial impurity atoms or displacement impurity atoms. It is more difficult to form the substitutional impurity atom than to form the interstitial impurity atom.

Vibrational Motion of an Interstitial Impurity Atom in a Face Centered Cubic Crystal

1981 ◽  
Vol 50 (9) ◽  
pp. 2948-2954 ◽  
Author(s):  
Yoshiko H. Ohashi ◽  
Misuzu Kaneko ◽  
Mitsuru Fukuchi ◽  
Kazutoshi Ohashi
Keyword(s):  
Impurity Atom ◽  
Interstitial Impurity ◽  
Face Centered Cubic ◽  
Vibrational Motion ◽  
Cubic Crystal ◽  
Face Centered

A New Defect in Polyethylene Single Crystals

1973 ◽  
Vol 31 ◽  
pp. 70-71
Author(s):  
E. L. Thomas ◽  
S. L. Sass
Keyword(s):  
Single Crystals ◽  
Screw Dislocation ◽  
Small Distance ◽  
Dipole Model ◽  
Dislocation Dipole ◽  
Chain Folding ◽  
Black And White ◽  
Polymer Crystal ◽  
Different Types

In polyethylene single crystals pairs of black and white lines spaced 700-3,000Å apart, parallel to the [100] and [010] directions, have been identified as microsector boundaries. A microsector is formed when the plane of chain folding changes over a small distance within a polymer crystal. In order for the different types of folds to accommodate at the boundary between the 2 fold domains, a staggering along the chain direction and a rotation of the chains in the plane of the boundary occurs. The black-white contrast from a microsector boundary can be explained in terms of these chain rotations. We demonstrate that microsectors can terminate within the crystal and interpret the observed terminal strain contrast in terms of a screw dislocation dipole model.

NUCLEAR ORIENTATION EFFECTS IN THE MÖSSBAUER SPECTRUM OF 125Te IN Pd2MnSb

1976 ◽  
Vol 37 (C6) ◽  
pp. C6-653-C6-655
Author(s):  
G. LANGOUCHE ◽  
B. B. TRIPLETT ◽  
N. S. DIXON ◽  
S. S. HANNA ◽  
P. BOOLCHAND
Keyword(s):  
Nuclear Orientation ◽  
Mossbauer Spectrum ◽  
Mössbauer Spectrum ◽  
Orientation Effects
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