Origins and implications of temperature-dependent activation energy barriers for dislocation nucleation in face-centered cubic metals

2009 ◽  
Vol 57 (14) ◽  
pp. 4267-4277 ◽  
Author(s):  
D.H. Warner ◽  
W.A. Curtin
Keyword(s):  
Activation Energy ◽  
Dislocation Nucleation ◽  
Face Centered Cubic ◽  
Temperature Dependent ◽  
Energy Barriers ◽  
Cubic Metals ◽  
Face Centered

Simulation of Void Growth at High Strain-Rate

1998 ◽  
Vol 539 ◽  
Author(s):  
J. Belak ◽  
R. Minich
Keyword(s):  
Molecular Dynamics ◽  
Perfect Crystal ◽  
Dislocation Nucleation ◽  
Growth Exponent ◽  
Face Centered Cubic ◽  
Dynamics Modeling ◽  
Cubic Metals ◽  
Embedded Atom ◽  
Molecular Dynamics Modeling ◽  
Face Centered

AbstractThe dynamic fracture (spallation) of ductile metals is known to initiate through the nucleation and growth of microscopic voids. Here, we apply atomistic molecular dynamics modeling to the early growth of nanoscale (2nm radius) voids in face centered cubic metals using embedded atom potential models. The voids grow through anisotropic dislocation nucleation and emission into a cuboidal shape in agreement with experiment. The mechanism of this nucleation process is presented. The resulting viscous growth exponent at late times is about three times larger than expected from experiment for microscale voids, suggesting either a length scale dependence or a inadequacy of the molecular dynamics model such as the perfect crystal surrounding the void.

The Synergistic Effects of Energy Barriers and Shear Directions on Twinning in Face Centered Cubic Metals

2019 ◽  
Author(s):  
Haoran Sun ◽  
Zhigang Ding ◽  
Hao Sun ◽  
Enrique J. Lavernia ◽  
Shuang Li ◽  
...  
Keyword(s):  
Synergistic Effects ◽  
Face Centered Cubic ◽  
Energy Barriers ◽  
Cubic Metals ◽  
Face Centered

A universal scaling of planar fault energy barriers in face-centered cubic metals

2011 ◽  
Vol 64 (7) ◽  
pp. 605-608 ◽  
Author(s):  
Z.H. Jin ◽  
S.T. Dunham ◽  
H. Gleiter ◽  
H. Hahn ◽  
P. Gumbsch
Keyword(s):  
Face Centered Cubic ◽  
Energy Barriers ◽  
Universal Scaling ◽  
Cubic Metals ◽  
Planar Fault ◽  
Face Centered

The synergistic effects of energy barriers and shear directions on twinning in face centered cubic metals

2020 ◽  
Vol 177 ◽  
pp. 109547
Author(s):  
Haoran Sun ◽  
Zhigang Ding ◽  
Hao Sun ◽  
Shuang Li ◽  
Enrique J. Lavernia ◽  
...  
Keyword(s):  
Synergistic Effects ◽  
Face Centered Cubic ◽  
Energy Barriers ◽  
Cubic Metals ◽  
Face Centered

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.

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