Lattice dynamics of face-centered-cubic metals using the ionic Morse potential immersed in the sea of free-electron gas

1984 ◽  
Vol 29 (6) ◽  
pp. 3117-3126 ◽  
Author(s):  
K. Mohammed ◽  
M. M. Shukla ◽  
F. Milstein ◽  
J. L. Merz
Keyword(s):  
Free Electron ◽  
Lattice Dynamics ◽  
Morse Potential ◽  
Electron Gas ◽  
Face Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Angular Forces in the Lattice Dynamics of Face-Centered Cubic Metals

1967 ◽  
Vol 164 (3) ◽  
pp. 895-899 ◽  
Author(s):  
P. S. Yuen ◽  
Y. P. Varshni
Keyword(s):  
Lattice Dynamics ◽  
Face Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Crystal equilibrium and lattice dynamics of face-centered cubic metals

1978 ◽  
Vol 56 (4) ◽  
pp. 447-452 ◽  
Author(s):  
O. P. Gupta ◽  
H. L. Kharoo ◽  
M. P. Hemkar
Keyword(s):  
Lattice Dynamics ◽  
Present Theory ◽  
Face Centered Cubic ◽  
Fcc Metals ◽  
Cubic Metals ◽  
Nearest Neighbours ◽  
Screening Parameter ◽  
Crystal Dynamics ◽  
Face Centered ◽  
Ionic Lattice

A lattice dynamical model that assumes short range pairwise forces effective up to second nearest neighbours and electron–ion interaction on the lines of Bhatia is considered to study the crystal dynamics of fcc metals. The authors consider an appropriate value of the screening parameter and the band structure effects have been introduced in a satisfactory manner in the present calculations. The volume force is averaged over the whole Wigner–Seitz sphere. The ionic lattice is in equilibrium in a medium of electrons. The present theory has been satisfactorily applied to compute dispersion curves, Debye characteristic temperatures, and temperature dependence on the Debye–Waller factors of thorium.

Higher order elastic constants of some face-centered cubic metals

1969 ◽  
Vol 47 (18) ◽  
pp. 1995-1999 ◽  
Author(s):  
Y. P. Sharma ◽  
S. S. Mathur
Keyword(s):  
Experimental Data ◽  
Potential Function ◽  
Elastic Constants ◽  
Fourth Order ◽  
Morse Potential ◽  
Face Centered Cubic ◽  
Cubic Metals ◽  
Atomic Interactions ◽  
Face Centered ◽  
Derivatives Of

The second, third, and fourth order elastic constants have been calculated using the Morse potential function for seven face-centered cubic metals taking into consideration the truncation up to 134 nearest atomic interactions. The calculated values have been compared with the experimental data and have been used for calculating the pressure derivatives of the second order elastic constants. The agreement between the calculated values and the experimental results is quite good.

Voids in Irradiated Tungsten and Molybdenum

1969 ◽  
Vol 27 ◽  
pp. 190-191
Author(s):  
Robert C. Rau ◽  
Robert L. Ladd
Keyword(s):  
Melting Point ◽  
Fast Neutron ◽  
Neutron Irradiation ◽  
Elevated Temperatures ◽  
Irradiation Temperature ◽  
The Body ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Recent studies have shown the presence of voids in several face-centered cubic metals after neutron irradiation at elevated temperatures. These voids were found when the irradiation temperature was above 0.3 Tm where Tm is the absolute melting point, and were ascribed to the agglomeration of lattice vacancies resulting from fast neutron generated displacement cascades. The present paper reports the existence of similar voids in the body-centered cubic metals tungsten and molybdenum.

scholarly journals A New Set-Up to Investigate Plastic Deformation of Face Centered Cubic Metals in High Strain Rate Loading

2014 ◽  
Vol 8 (2) ◽  
Author(s):  
Ehsan Etemadi ◽  
Jamal Zamani ◽  
Alessandro Francesconi ◽  
Mohammad V. Mousavi ◽  
Cinzia Giacomuzzo
Keyword(s):  
Plastic Deformation ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Face Centered Cubic ◽  
Cubic Metals ◽  
Face Centered ◽  
Set Up ◽  
Strain Rate Loading

An Sem/Ebsd Study of Shear Bands Formation in Al-0.23%wt.Zr Alloy Deformed in Plane Strain Compression / Krystalograficzne Aspekty Formowania Sie Pasm Scinania W Stopie Al-0.23%Wag.Zr Odkształcanym W Próbie Nieswobodnego Sciskania

2013 ◽  
Vol 58 (1) ◽  
pp. 145-150 ◽  
Author(s):  
H. Paul ◽  
P. Uliasz ◽  
M. Miszczyk ◽  
W. Skuza ◽  
T. Knych
Keyword(s):  
Crystal Lattice ◽  
Grain Boundaries ◽  
Texture Evolution ◽  
Shear Bands ◽  
Shear Direction ◽  
Face Centered Cubic ◽  
Electron Backscattered Diffraction ◽  
Cubic Metals ◽  
Slip Planes ◽  
Face Centered

The crystal lattice rotations induced by shear bands formation have been examined in order to investigate the influence of grain boundaries on slip propagation and the resulting texture evolution. The issue was analysed on Al-0.23wt.%Zr alloy as a representative of face centered cubic metals with medium-to-high stacking fault energy. After solidification, the microstructure of the alloy was composed of flat, twin-oriented, large grains. The samples were cut-off from the as-cast ingot in such a way that the twinning planes were situated almost parallel to the compression plane. The samples were then deformed at 77K in channel-die up to strains of 0.69. To correlate the substructure with the slip patterns, the deformed specimens were examined by SEM equipped with a field emission gun and electron backscattered diffraction facilities. Microtexture measurements showed that strictly defined crystal lattice re-orientations occurred in the sample volumes situated within the area of the broad macroscopic shear bands (MSB), although the grains initially had quite different crystallographic orientations. Independently of the grain orientation, their crystal lattice rotated in such a way that one of the f111g slip planes became nearly parallel to the plane of maximum shear. This facilitates the slip propagation across the grain boundaries along the shear direction without any visible variation in the slip plane. A natural consequence of this rotation is the formation of specific MSB microtextures which facilitates slip propagation across grain boundaries.

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