Strain Evolution of Highly Asymmetric Polycrystalline Ferroelectric Ceramics via a Self-Consistent Model and In Situ X-Ray Diffraction

2012 ◽  
Vol 95 (12) ◽  
pp. 3947-3954 ◽  
Author(s):  
Goknur Tutuncu ◽  
Maziar Motahari ◽  
Joel Bernier ◽  
Mesut Varlioglu ◽  
Jacob L. Jones ◽  
...  
Keyword(s):  
Ferroelectric Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Strain Evolution ◽  
Consistent Model ◽  
Self Consistent

Study of Micromechanical Behaviour of Two Phase Polycrystalline Materials Using Diffraction and Self Consistent Model

2014 ◽  
Vol 783-786 ◽  
pp. 2059-2064
Author(s):  
Andrzej Baczmański ◽  
Elżbieta Gadalińska ◽  
Chedly Braham ◽  
Sebastian Wroński ◽  
Lea le Joncour ◽  
...  
Keyword(s):  
Lattice Strain ◽  
Polycrystalline Materials ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Consistent Model ◽  
Self Consistent ◽  
In Situ Deformation ◽  
Specific Orientation

Diffraction methods for lattice strain measurement provide useful information concerning the nature of grains behaviour during elastoplastic deformation. The main advantage of the diffraction methods is the possibility of studying mechanical properties of polycrystalline materials separately in each phase and in groups of grains with a specific orientation. In this work we present application of the neutron and X-ray diffraction to study “in situ” deformation of two phase stainless steels during tensile loading. The experimental results are compared with self-consistent model.

Coherent strain evolution at the initial growth stage of AlN on SiC(0001) proved by in situ synchrotron X-ray diffraction

2020 ◽  
Vol 13 (5) ◽  
pp. 055501 ◽  
Author(s):  
Hidetoshi Suzuki ◽  
Fumitaro Ishikawa ◽  
Takuo Sasaki ◽  
Masamitu Takahasi
Keyword(s):  
Growth Stage ◽  
Initial Growth ◽  
X Ray Diffraction ◽  
X Ray ◽  
Initial Growth Stage ◽  
Strain Evolution

scholarly journals Determining Ti-17 β-Phase Single-Crystal Elasticity Constants through X-Ray Diffraction and Inverse Scale Transition Model

2011 ◽  
Vol 681 ◽  
pp. 97-102 ◽  
Author(s):  
Sylvain Fréour ◽  
Emmanuel Lacoste ◽  
Manuel François ◽  
Ronald Guillén
Keyword(s):  
Mechanical Load ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Β Phase ◽  
Consistent Model ◽  
Self Consistent ◽  
Diffraction Lattice ◽  
Two Phases ◽  
Multi Phase

The scope of this work is the determination of single-crystals elastic constants (SEC) from X-ray diffraction lattice strains measurements performed on multi-phase polycrystals submitted to mechanical load through a bending device. An explicit three scales inverse self-consistent model is developed in order to express the SEC of a cubic phase, embedded in a multi-phase polycrystal, as a function of its X-ray Elasticity Constants. Finally, it is applied to a two-phases (α+β) titanium based alloy (Ti-17), in order to estimate Ti-17 β-phase unknown SEC. The purpose of the present work is to account the proper microstructure of the material. In particular, the morphologic texture of Ti-17 a-phase, i.e. the relative disorientation of the needle-shaped grains constituting this phase, is considered owing to the so-called Generalized Self-Consistent model.

scholarly journals Effect of Interlamellar Spacing on the Monotonic Behavior of C70 Pearlitic Steel

2014 ◽  
Vol 996 ◽  
pp. 88-93
Author(s):  
Houda Yahyaoui ◽  
Habib Sidhom ◽  
Chedly Braham ◽  
Andrzej Baczmański ◽  
Manuel François ◽  
...  
Keyword(s):  
Plastic Anisotropy ◽  
Critical Shear Stress ◽  
Interlamellar Spacing ◽  
Pearlitic Steel ◽  
Shear Stresses ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lattice Strains ◽  
Consistent Model ◽  
Self Consistent

The effect of interlamellar spacing on monotonic behavior of C70 pearlitic steel was investigated. Tensile tests under X-ray diffraction coupled with self-consistent model have been used to identify the role of interlamellar spacing on the ferrite plasticity parameters and residual stresses. It has been established that yielding of pearlite is controlled by ferrite critical shear stresses ( τc 0α) which is higher for the smaller interlamellar spacing. Moreover, the residual stress level in ferrite is higher for the largest interlamellar spacing under the same imposed total strain. Lattice strains, measured by synchrotron X-ray diffraction, show an elastic and plastic anisotropy of ferrite crystallites and high stresses in cementite which confirm the self-consistent model calculation. Keywords: Pearlitic steel, X-ray diffraction, Synchrotron radiation, Self-consistent model, Critical shear stress, Lattice strains.

Preparation and Damping Capacities of the NiTiSMA/FC Composites

2010 ◽  
Vol 97-101 ◽  
pp. 1601-1606 ◽  
Author(s):  
Qing Suo Liu ◽  
Cui Min Lu ◽  
Xu Ma ◽  
X.M. Lu ◽  
X.Y. Gao
Keyword(s):  
Sol Gel ◽  
Ferroelectric Ceramics ◽  
Niti Shape Memory Alloy ◽  
X Ray Diffraction ◽  
Dynamic Mechanical Analyzer ◽  
Pure Perovskite Structure ◽  
X Ray ◽  
Ceramic Film ◽  
Better Than

NiTiSMA/FC composites have been prepared by depositing ferroelectric ceramics films on NiTi shape memory alloy substrate with the sol-gel method. Heterojunction structure of the composites has been characterized by using X-ray diffraction and scanning electron microscope. The differences of the damping capacities between NiTiSMA/FC composites and NiTiSMA substrates have been tested by the Dynamic Mechanical Analyzer. The results show pure perovskite structure could be obtained in the FC films part of NiTiSMA/FC composites sintered at 650oC. The transitional TiO2 layer produced in-situ by the oxidation of the surface of the NiTiSMA substrate improves the combined function between the ceramic film and NiTiSMA substrate. When the temperature is lower than 20oC, the tanδ of NiTiSMA/FC composites is stabilized at 3.5%, the vibration frequencies (within 0.33-10Hz) have a small effect on damping capacities. Within the temperature of 20-40oC, there is a tanδ peak up to 5.0%.The damping capacities of NiTiSMA/FC composites are better than the pure NiTiSMA materials.

scholarly journals Thermal stresses in hexagonal materials –heat treatment influence on their mechanical behaviour

2004 ◽  
Vol 120 ◽  
pp. 185-190
Author(s):  
D. Gloaguen ◽  
S. Freour ◽  
M. François ◽  
R. Guillen ◽  
J. Royer
Keyword(s):  
Mechanical Behaviour ◽  
Thermal Stresses ◽  
Internal Stresses ◽  
X Ray Diffraction ◽  
Cooling Process ◽  
Two Phase ◽  
Plastic Properties ◽  
X Ray ◽  
Consistent Model ◽  
Self Consistent

Internal stresses due to anisotropic thermal and plastic properties were investigated in rolled zirconium and titanium. The thermal stresses induced by a cooling process were predicted using a self-consistent model and compared with experimental results obtained by X-ray diffraction. The study of the elastoplastic response during uniaxial loading was performed along the rolling and the transverse direction of the sheet, considering the influence of the texture and the thermal stresses on the mechanical behaviour. An approach in order to determine the thermal behaviour of phases embedded in two-phase materials is also presented.

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