Grain Boundary Contrasting on the Map of the Crystallographic Orientation Topography/ Korngrenzenkontrastierung durch kristallographisches Orientierungs-Topographie-Mapping

2002 ◽  
Vol 39 (3) ◽  
pp. 126-139
Author(s):  
J. Pospiech ◽  
K. Wiencek ◽  
A. Morawiec ◽  
A. Piatkowski
Keyword(s):  
Grain Boundary ◽  
Crystallographic Orientation

Rodrigues-Frank Space Representations of Fiber Texture

1995 ◽  
Vol 403 ◽  
Author(s):  
Krishna Rajan ◽  
Ronald Petkie
Keyword(s):  
Thin Films ◽  
Grain Boundary ◽  
Crystallographic Orientation ◽  
Fiber Texture ◽  
Boundary Structure ◽  
Structure Information ◽  
Grain Boundary Structure ◽  
Specific Determination

AbstractThe concept of fcc fiber texture is examined in the context of Rodrigues-Frank (R-F) representations. Using fiber texture in thin films as the basis of our analysis, it is shown that this approach when combined with grain specific determination of crystallographic orientation provides a useful means of detecting a number of texture components with relatively small grain sampling densities. The application of R-F representations is also shown to be a useful methodology to couple grain boundary structure information with microtexture data.

scholarly journals DEPENDENCE OF CRACK FORMATION ON CRYSTALLOGRAPHIC ORIENTATION FOR ICE

1966 ◽  
Vol 44 (11) ◽  
pp. 2757-2764 ◽  
Author(s):  
L. W. Gold
Keyword(s):  
Grain Boundary ◽  
Crystallographic Orientation ◽  
Basal Plane ◽  
Applied Load ◽  
Crack Formation ◽  
Compressive Load ◽  
Slip Systems ◽  
Polycrystalline Ice ◽  
Minimum Number ◽  
Columnar Grain

Observations are reported of crack propagation in columnar-grain, polycrystalline ice subjected to constant compressive load applied perpendicular to the long axis of the columns. About three-quarters of the cracks observed were transcrystalline and the remainder occurred at grain boundaries. The plane of the cracks tended to be parallel to the direction of the applied load. Transcrystalline cracks tended to propagate either parallel or perpendicular to the basal plane. At least two-thirds of the grain boundary cracks were associated with boundaries for which the slip plane of one or both of the adjacent grains was close to parallel or perpendicular to the boundary. It is shown that the observations are consistent with the hypothesis that a minimum number of independent slip systems are required for a grain to conform to an arbitrary deformation under constraints imposed by neighboring grains.

The Pyrochlore-to-Perovskite Transformation in Solution-Derived Lead Zirconate Titanate Thin Films

1994 ◽  
Vol 361 ◽  
Author(s):  
James A. Voigt ◽  
B.A. Tuttle ◽  
T.J. Headley ◽  
D.L. Lamppa
Keyword(s):  
Thin Films ◽  
Grain Boundary ◽  
Grain Growth ◽  
Lead Zirconate Titanate ◽  
Volume Change ◽  
Crystallographic Orientation ◽  
Crystallization Process ◽  
Perovskite Phase ◽  
Lead Zirconate ◽  
Two Dimensional

ABSTRACTWe have characterized the pyrochlore-to-perovskite crystallization process in solution-derived Pb(Zr0.20Ti0.80)O3 thin films on (100) MgO single crystal substrates. It has been determined that the perovskite phase nucleated preferentially at the film/MgO interface out of a nanocrystalline (≈100Å grains) pyrochlore matrix. During the early stages of the pyrochlore-to-perovskite conversion process, perovskite growth proceeded nearly isotropically from the substrate to form hemispherically shaped grains. Deviations from isotropie growth were shown to result from a growth dependence based on the crystallographic orientation of a growing perovskite grain relative to the orientations of pyrochlore grains being transformed. The volume change that occurs during the pyrochlore-to-pervoskite transformation along with two-dimensional grain growth has been used to develop a mechanism for formation of porosity that commonly is concentrated in grain boundary regions.

scholarly journals Influence of crystallographic orientation on the void growth at the grain boundaries in bi-crystals

2020 ◽  
Author(s):  
GUADALUPE VADILLO
Keyword(s):  
Grain Boundary ◽  
Representative Volume Element ◽  
Void Growth ◽  
Crystallographic Orientation ◽  
Stress Triaxiality ◽  
Volume Element ◽  
Lattice Rotation ◽  
Lode Parameter ◽  
Representative Volume ◽  
The Impact

Void growth and morphology evolution in fcc bi-crystals are investigated using crystal plasticity fi?nite element method. For that purpose, representative volume element of bi-crystals with a void at the grain boundary are considered in the analysis. Grain boundary is assumed initially perpendicular/coaxial with the straight sides of the cell. Fully periodic boundary conditions are prescribed in the representative volume element and macroscopic stress triaxiality and Lode parameter are kept constant during the whole deformation process. Three di?erent pairs of crystal orientations characterized as hard-hard, soft-soft and soft-hard has been employed for modellingthe mechanical response of the bi-crystal. Simulations are performed to study the implications of triaxiality, Lode parameter and crystallographic orientation on slip mechanism, hardening and hence void evolution. The impact of void presence and its growth on the heterogeneity of lattice rotation and resulting grain fragmentation in neighbouring areas is also analysed and discussed.

Effect of Grain Boundary and Crystallographic Orientation on the Stress Corrosion Behavior of an Al-Zn-Mg Alloy

2019 ◽  
Vol 28 (5) ◽  
pp. 2954-2966 ◽  
Author(s):  
Jianguo Tang ◽  
Yidan Zhang ◽  
Lingying Ye ◽  
Meng Qu ◽  
Jianshan Wu ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Corrosion Behavior ◽  
Crystallographic Orientation ◽  
Mg Alloy

Deformation Mechanisms of Single Crystals and Bicrystals Subjected to Equal-Channel Angular Pressing - Review

2009 ◽  
Vol 633-634 ◽  
pp. 511-525
Author(s):  
Wei Zhong Han ◽  
Shou Xin Li ◽  
Shi Ding Wu ◽  
Zhe Feng Zhang
Keyword(s):  
Grain Boundary ◽  
Single Crystals ◽  
Shear Deformation ◽  
Equal Channel Angular Pressing ◽  
Microstructural Evolution ◽  
Crystallographic Orientation ◽  
World Wide ◽  
Experimental Results ◽  
Deformation Mechanisms ◽  
Angular Pressing

The deformation mechanisms of various kinds of single crystals and bicrystals during the process of equal channel angular pressing (ECAP) have been paid more attention world wide. This paper reviews the recent progresses in the understanding of the deformation mechanisms of single crystals and bicrystals subjected to one-pass ECAP, and discusses the effect of initial crystallographic orientation and grain boundary on the microstructural evolution of these crystals. Based on those experimental results and analysis, it is suggested that in addition to the shear deformation along the intersection plane (IP) of ECAP die, the shear along the normal of IP also plays an important role in affecting the microstructural evolution and deformation mechanisms of these single crystals and bicrystals.

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