Molecular Dynamics Study on the Characteristics of Edge and Screw Dislocations in Gamma/Gamma-Prime Microstructure of Ni-Based Superalloy

2004 ◽  
pp. 59-68 ◽  
Author(s):  
Kisaragi Yashiro ◽  
Yasushi Tabata ◽  
Yoshihiro Tomita
Keyword(s):  
Molecular Dynamics ◽  
Screw Dislocations ◽  
Gamma Prime

Atomic-Scale Modeling of the Annihilation of Jogged Screw Dislocation Dipoles

1999 ◽  
Vol 578 ◽  
Author(s):  
T. Vegge ◽  
O. B. Pedersen ◽  
T. Leffers ◽  
K. W. Jacobsen
Keyword(s):  
Molecular Dynamics ◽  
Screw Dislocation ◽  
Atomic Scale ◽  
Atomistic Simulations ◽  
Elastic Band ◽  
Screw Dislocations ◽  
Scale Modeling ◽  
Band Method

AbstractUsing atomistic simulations we investigate the annihilation of screw dislocation dipoles in Cu. In particular we determine the influence of jogs on the annihilation barrier for screw dislocation dipoles. The simulations involve energy minimizations, molecular dynamics, and the Nudged Elastic Band method. We find that jogs on screw dislocations substantially reduce the annihilation barrier, hence leading to an increase in the minimum stable dipole height.

Dynamic properties of screw dislocations in Cu:  A molecular dynamics study

2003 ◽  
Vol 67 (2) ◽  
Author(s):  
D. Mordehai ◽  
Y. Ashkenazy ◽  
I. Kelson ◽  
G. Makov
Keyword(s):  
Molecular Dynamics ◽  
Dynamic Properties ◽  
Screw Dislocations

Molecular dynamics simulations of motion of edge and screw dislocations in a metal

2002 ◽  
Vol 23 (1-4) ◽  
pp. 111-115 ◽  
Author(s):  
Jinpeng Chang ◽  
Wei Cai ◽  
Vasily V Bulatov ◽  
Sidney Yip
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Screw Dislocations ◽  
Dynamics Simulations

Strain energy analysis of screw dislocations in 4H-SiC by molecular dynamics

2016 ◽  
Vol 55 (3) ◽  
pp. 031301 ◽  
Author(s):  
Takahiro Kawamura ◽  
Mitsutoshi Mizutani ◽  
Yasuyuki Suzuki ◽  
Yoshihiro Kangawa ◽  
Koichi Kakimoto
Keyword(s):  
Molecular Dynamics ◽  
Strain Energy ◽  
Energy Analysis ◽  
Screw Dislocations

scholarly journals Dislocation Structures in the Gamma Prime-Phase of CMSX-4 and TMS75 after Degradation under Service Conditions

2011 ◽  
Vol 278 ◽  
pp. 25-30 ◽  
Author(s):  
Thomas Link ◽  
Alexander Epishin ◽  
Nils Nawrath ◽  
Catrina Michel ◽  
Mohamed Nazmy
Keyword(s):  
Single Crystal ◽  
High Temperatures ◽  
Stacking Fault ◽  
Creep Tests ◽  
Screw Dislocations ◽  
Gamma Prime ◽  
Service Conditions ◽  
Prime Phase

The single crystal superalloys CMSX-4 and TMS75 were tested for very long times at high temperatures in laboratory creep tests and in service. The microstructure was investigated in TEM and SEM. It was found, that the ’-phase is cut at stresses much below the threshold given in literature. Cutting takes place by <110> screw dislocations. These mobile dislocations can be locked locally by a Giamei-lock. Thus a stacking fault dipole forms between the locked segment and the preceding ones. The dipole consists of two supershockley dislocations with 30° character, which are also stabilized by Giamei locks. The dipole formation is analyzed and discussed in detail.

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