Stress Orientation Dependence of Dislocation Glide in Epitaxial Films

1990 ◽  
Vol 202 ◽  
Author(s):  
S. Dakshinamurthy ◽  
K. Rajan
Keyword(s):  
Crystal Orientation ◽  
Stereographic Projection ◽  
Epitaxial Films ◽  
Orientation Dependence ◽  
Stress Axis ◽  
Dislocation Glide ◽  
Stress Orientation ◽  
Slip Transfer

ABSTRACTThe effect of different stresses on the glide of the commonly observed dislocations in epitaxial films is systematically investigated. The possibility of planar dissociation of perfect dislocations and the conditions for their subsequent glide are explored.Slip transfer from one plane to another is affected by the crystal orientation relative to the stress axis. This process is quantitatively analyzed by calculating iso-Schmid factors on a stereographic projection. The results of this model are correlated with those found in the literature.

scholarly journals A Stress Orientation Analysis Framework for Dislocation Glide in Face-Centred Cubic Metals

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 445 ◽  
Author(s):  
Fernando Daniel León-Cázares ◽  
Catherine Mary Fiona Rae
Keyword(s):  
Slip Plane ◽  
Orientation Dependence ◽  
Slip Systems ◽  
Analysis Framework ◽  
Orientation Analysis ◽  
Dislocation Glide ◽  
Stress Orientation ◽  
Orientation Maps ◽  
Nucleation Mechanisms ◽  
Geometrical Constraints

Plastic deformation in metals is heavily influenced by the loading direction. Studies have explored its effects on multiple mechanisms by analysing individual dislocations, but there is currently no systematic way of rationalising the cooperative behaviour of the different slip systems for arbitrary stress tensors. The current study constitutes the foundation of a new orientation analysis framework for face-centred cubic crystals by introducing “stress orientation maps”, graphical tools to simultaneously analyse the effects of loading orientation on the stress state of the a 2 ⟨ 1 1 ¯ 0 ⟩ { 111 } and a 6 ⟨ 112 ⟩ { 111 } slip systems in a comprehensive, yet intuitive way. Relationships between the Schmid and Escaig stresses are described from geometrical constraints of the slip systems in the crystal structure, linking the dislocation behaviour on a slip plane with the stress tensor via a one parameter description. The case of uniaxial loading along different orientations within the fundamental sector of the unit cell is explored to describe the physical basis, properties and capabilities of this framework. The stress normal to the slip plane is then considered in the analysis via an extension of the Mohr’s circles. The orientation dependence of two twin nucleation mechanisms from the literature are examined as examples of how the stress orientation maps can be used.

Growth and Characterization of Fept Compound thin Films

1995 ◽  
Vol 384 ◽  
Author(s):  
M.R. Visokay ◽  
R. Sinclair
Keyword(s):  
Epitaxial Films ◽  
Orientation Dependence ◽  
Kerr Rotation ◽  
Fept Alloy ◽  
Disordered Alloys ◽  
Disordered Films ◽  
Out Of Plane ◽  
Temperature Deposition ◽  
Fcc Alloys

ABSTRACTFePt alloy films were deposited at 50 and 49°C onto amorphous SiO2 and single crystal [001] MgO and [0001] Al2O3 using DC magnetron cosputtering, resulting in polycrystalline and [001] and [111] epitaxial films, respectively. High temperature deposition resulted in ordered films with the tetragonal Ll structure and out-of-plane magnetic easy axes while low temperature deposition yielded chemically disordered fcc alloys with in-plane easy axes. Significant modification of the magneto-optic Kerr spectrum is observed for ordered relative to disordered alloys for all orientations. The Kerr rotation has a strong orientation dependence for the ordered, but not disordered films.

Crystal orientation dependence of the spin-orbit coupling in InAs nanowires

2018 ◽  
Vol 97 (4) ◽  
Author(s):  
T. S. Jespersen ◽  
P. Krogstrup ◽  
A. M. Lunde ◽  
R. Tanta ◽  
T. Kanne ◽  
...  
Keyword(s):  
Crystal Orientation ◽  
Orientation Dependence ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Inas Nanowires

Orientation Dependence of Ductility of Mg Single Crystals at Elevated Temperature

2005 ◽  
Vol 488-489 ◽  
pp. 193-196 ◽  
Author(s):  
Hiromi Miura ◽  
Taku Sakai ◽  
H. Nogawa ◽  
Xu Yue Yang ◽  
Yoshimi Watanabe ◽  
...  
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Crystal Orientation ◽  
Fracture Strain ◽  
Orientation Dependence ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
High Ductility ◽  
Superplastic Behavior ◽  
Strong Orientation

Orientation-controlled Mg single crystals were tensile tested at temperatures between 473 K and 673 K at a strain rate of 4.2 x 10-4 s-1 in vacuum. Though all the single crystals showed high ductility compared with that of polycrystals, the ductility of the single crystals strongly depended on the crystal orientation. The [27 -1 -26 1] single crystal showed 0.57 fracture strain, while the [3 8 -11 -1] single crystal showed superplastic behavior of ductility over 1.8 strain. The observed strong orientation dependence of ductility seemed to be caused by orientation dependence of ease occurrence of dynamic recrystallization (DRX) in the single crystals during high-temperature deformation. The orientation dependence of ductility of Mg single crystals will be discussed in detail concerning crystallographical orientations of the single crystals, occurrence of DRX and fracture.

Crystal orientation dependence of crack growth and stress evolution in single crystal nickel: a molecular dynamics simulation-based cohesive zone model

RSC Advances ◽  
2015 ◽  
Vol 5 (81) ◽  
pp. 65942-65948 ◽  
Author(s):  
Yuan Qi ◽  
Wen-Ping Wu ◽  
Yun-Bing Chen ◽  
Ming-Xiang Chen
Keyword(s):  
Molecular Dynamics ◽  
Cohesive Zone ◽  
Crystal Orientation ◽  
Cohesive Zone Model ◽  
Orientation Dependence ◽  
Dynamics Simulation ◽  
Zone Model ◽  
Stress Evolution ◽  
Slip Bands ◽  
Simulation Based

Void forms in the sample with (100) orientation; brittle fracture in the sample with (110) orientation; blunting and slip bands occurs in the sample with (111) orientation.

Crystal-Orientation Dependence of Raman Spectra of Natural Air Hydrate Single Crystal

1997 ◽  
Vol 101 (32) ◽  
pp. 6180-6183 ◽  
Author(s):  
Tomoko Ikeda ◽  
Hiroshi Fukazawa ◽  
Shinji Mae ◽  
Takeo Hondoh ◽  
Langway
Keyword(s):  
Single Crystal ◽  
Raman Spectra ◽  
Crystal Orientation ◽  
Orientation Dependence

Crystal orientation dependence of the dielectric properties for epitaxial BaZr0.15Ti0.85O3 thin films

2007 ◽  
Vol 90 (2) ◽  
pp. 022903 ◽  
Author(s):  
J. Miao ◽  
J. Yuan ◽  
H. Wu ◽  
S. B. Yang ◽  
B. Xu ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Properties ◽  
Crystal Orientation ◽  
Orientation Dependence
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