scholarly journals A dislocation density-based continuum model of the anisotropic shock response of single crystal α-cyclotrimethylene trinitramine

2017 ◽  
Vol 98 ◽  
pp. 63-86 ◽  
Author(s):  
D.J. Luscher ◽  
F.L. Addessio ◽  
M.J. Cawkwell ◽  
K.J. Ramos
Keyword(s):  
Dislocation Density ◽  
Single Crystal ◽  
Continuum Model ◽  
Cyclotrimethylene Trinitramine ◽  
Shock Response

A continuum model for the creep of single crystal nickel-base superalloys

2005 ◽  
Vol 53 (3) ◽  
pp. 669-679 ◽  
Author(s):  
Sharat C. Prasad ◽  
I.J. Rao ◽  
K.R. Rajagopal
Keyword(s):  
Single Crystal ◽  
Continuum Model ◽  
Nickel Base Superalloys ◽  
Nickel Base

A dislocation density-based single crystal constitutive equation

2010 ◽  
Vol 26 (7) ◽  
pp. 925-938 ◽  
Author(s):  
M.G. Lee ◽  
H. Lim ◽  
B.L. Adams ◽  
J.P. Hirth ◽  
R.H. Wagoner
Keyword(s):  
Dislocation Density ◽  
Constitutive Equation ◽  
Single Crystal

Single-Crystal Aluminum Nitride Substrate Preparation from Bulk Crystals

2001 ◽  
Vol 680 ◽  
Author(s):  
J. Carlos Rojo ◽  
Leo J. Schowalter ◽  
Kenneth Morgan ◽  
Doru I. Florescu ◽  
Fred H. Pollak ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Analysis ◽  
Dislocation Density ◽  
Single Crystal ◽  
High Strain ◽  
Bulk Crystals ◽  
Scanning Thermal Microscopy ◽  
Substrate Preparation ◽  
X Ray ◽  
Differential Expansion

ABSTRACTLarge (15mm diameter) single-crystal AlN boules have been prepared using sublimationrecondensation growth. X-ray topography shows that the dislocation density averages less than 103 cm2 in some of the substrates but also that the dislocations are not uniformly distributed. Also, strain due to the differential expansion with the crucible walls seems to cause severe cracking in the periphery of the crystal and high-strain regions. Thermal analysis using the Scanning Thermal Microscopy (SThM) reveals a thermal conductivity of 3.4 ± 0.2 W/K-cm, which is the largest value ever reported for AlN.

A nitrogen doped low-dislocation density free-standing single crystal diamond plate fabricated by a lift-off process

2014 ◽  
Vol 104 (25) ◽  
pp. 252109 ◽  
Author(s):  
Yoshiaki Mokuno ◽  
Yukako Kato ◽  
Nobuteru Tsubouchi ◽  
Akiyoshi Chayahara ◽  
Hideaki Yamada ◽  
...  
Keyword(s):  
Dislocation Density ◽  
Single Crystal ◽  
Free Standing ◽  
Nitrogen Doped ◽  
Diamond Plate ◽  
Low Dislocation Density ◽  
Single Crystal Diamond ◽  
Lift Off

Influence of Initial Defects on the Mechanical Properties of Single Crystal Copper: Discrete Dislocation Dynamics Study

2018 ◽  
Vol 913 ◽  
pp. 627-635
Author(s):  
Ming Yi Zhang ◽  
Min Zhong ◽  
Shuai Yuan ◽  
Jing Song Bai ◽  
Ping Li
Keyword(s):  
Dislocation Density ◽  
Single Crystal ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Dislocation Dynamics ◽  
Single Crystal Copper ◽  
Discrete Dislocation Dynamics ◽  
Discrete Dislocation ◽  
Stress Curve ◽  
Initial Dislocation Density

In this paper, three dimensional discrete dislocation dynamics method was used to quantitatively investigate the influence of initial defects on mechanical response of single crystal copper. Both the irradiation defects (interstitial loops) and random dislocation lines with different densities are considered. The simulation results demonstrate that the yield strength of single crystal copper is higher with higher initial dislocation density and higher interstitial loop density. Dislocation density increases quickly by nucleation and multiplication and microbands are formed during plastic deformation when only the random dislocation lines are initially considered. Characteristics of microbands show excellent agreement with experiment results. Dislocation multiplication is suppressed in the presence of interstitial loops, and junctions and locks between dislocations and interstitial loops are formed. Dislocation density evolution shows fluctuation accompanied with strain-stress curve fluctuation.

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