1,721,077 research outputs found
Glide strains dependency on Schmid's factor of secondary slip systems in copper single crystals
No full textThe deformation behavior of Cu single crystal has been investigated by synchrotron radiation. The variation point of slope in the difference of glide strains corresponds to the exchange point of Schmid's factor of the secondary slip systems. This phenomenon may be originated by the interaction between the primary and secondary slip systems. (C) 2002 Elsevier Science B.V. All rights reserved.X116sciescopu
New interpretation about deviation of glide strains: In situ measurement by synchrotron radiation of lattice rotation in a copper single crystal
No full textX111sciescopu
In-situ X-ray diffraction study about uniaxial deformation behavior in a copper single crystal
No full textThe deformation behavior of pure Cu single crystal has been investigated by scanning electron microscopy (SEM) and the in-situ reflection Lane method using synchrotron radiation. The main operative slip systems were determined by the slip line measurement and in-situ X-ray diffraction. The ( (1) over bar 11)[101] and ((1) over bar 11)[0 (1) over bar1] slip systems mainly operate in the middle region of sample but the (111)[(1) over bar 01] and ((1) over bar(1) over bar1)[011] slip systems are activated in the corner region. The condition of a minimum glide path-length through single crystal should be taken into account as one of the factors to determine the main operative slip system. (C) 2002 Elsevier Science B.V. All rights reserved.X116sciescopu
X-RAY-MEASUREMENT OF LATTICE STRAINS IN TEXTURED LOW-CARBON STEEL UNDER UNIAXIAL LOADING
No full textTo examine the effect of relative crystallite misorientations on the inhomogeneous deformation behavior, lattice strains in the crystallites of a textured low-carbon steel are measured by an in situ X-ray diffraction method under uniaxial loading. Internal microstresses of the crystallites are also determined from the lattice strains measured along different directions of the crystallites. The low-carbon steel has the rolling texture of orientation relationship: {211}[01(1) over bar], {111}[2 (1) over bar (1) over bar], and {100}[011]. Different lattice stress-strain curves are obtained from the different crystallite groups, which show dissimilarity in the proportionality constant between the stress and lattice strain and the elastic limit of each crystallite group. The external elastic limit can be calculated from averaging the individual lattice yield points of each crystallite groups. Triaxial stress states are developed in the crystallites in the entire range of the elastic and plastic regions during uniaxial loading. The residual stresses of the specimen unloaded at a strain level of about 3 pct are in a biaxial stress state.open112sciescopu
Thickness dependence of (001) texture evolution in FePt thin films on an amorphous substrate
No full textThickness dependency of (001) texture evolution in Fe54Pt46 thin films on an amorphous substrate was investigated using in-house X-ray diffraction or a synchrotron source. The (001) texture was well developed in Fe54Pt46 thin films, especially when its thickness was equivalent to the grain height. The findings show that strain relaxation anisotropy along the film axis, which leads to a (001) crystal (a crystal with a (001) plane parallel to the film plane) that is more stable than others, was large for a low thickness film. In addition, abnormal grain growth was used to explain the abrupt development of a (001) texture. The advantage of multilayered as-deposited structure is also discussed. (c) 2007 Elsevier B.V. All rights reserved.X1120sciescopu
In-situ X-ray diffraction study of single-slip-conditioned copper single crystals during uniaxial deformations
No full textThe broadening of X-ray peak profiles and movements of tensile axes were obtained simultaneously in single-slip-conditioned copper single crystals. Two types of sample showed different tensile axis movements and slip system activities. These results are in accord with the observation of slip lines with scanning electron microscopy. The broadening of the X-ray peak profiles is highly dependent on the absolute Value of g.b despite the same amount of deformation. The slope between shear stress and beta (disorder) Obtained from broadening generally shows similar trends for samples A and B. As soon as the tensile axis leaves its original stereographic triangle, beta (disorder) stops increasing in sample B. This phenomenon indicates the change of activation of(111)[(1) over bar 01] and ((1) over bar(1) over bar1)[011] slip systems.X1110sciescopu
Nucleation modes of the drop tube processed Nd70Fe20Al10 droplets
No full textThe Nd70Fe20Al10 bulk metallic glass forming alloy was processed by the drop tube processing (DTP) method. Droplets consisted of mixed crystalline and amorphous phases, and an anomaly in the plot of droplet size vs. heat of crystallization was observed by thermal analysis. To understand this, a surface heterogeneous nucleation model which follows from the surface oxidation during DTP was suggested. And three representative nucleation mechanisms in DTP such as homogeneous, volume heterogeneous, and surface heterogeneous mechanism were discussed qualitatively. (C) 2003 Elsevier B.V. All rights reserved.X116sciescopu
The effect of residual strain on (001) texture evolution in FePt thin film during postannealing
No full textResidual strain in a Fe55Pt45 thin film was investigated in order to provide experimental support for a previous theoretical study [J.-S. Kim , J. Appl. Phys. 99, 053906 (2006)] in which a strong evolution of (001) texture during the postannealing of deposited FePt thin films was attributed to amorphous substrates. Residual strain measurements using dual diffraction peaks to analyze the strain state were used in the study. The findings show that transformation and biaxial in-plane strains coexist in annealed Fe55Pt45 films and their effect could lower the strain energy of the (001) crystal (crystal with a [001] crystallographic orientation into the surface normal) when grain growth proceeds actively. Therefore, we propose that anisotropic strain due to ordering transformations under tensile in-plane strain is a key factor that affects texture evolution. The importance of the subsequent grain growth is also discussed. (c) 2006 American Institute of Physics.open111925sciescopu
Structural characterization of AlN thin film deposited on a single crystal of Al2O3(0001) substrate
No full textThe structure of an AIN thin film deposited on an Al2O3 substrate was examined using symmetric and grazing incident X-ray diffraction (CID). Line profile analysis was applied to obtain quantitative structural information from a single peak. The orientational relationship between the thin film and the substrate is AIN(0001)parallel to Al2O3(0001) and AIN[10 (1) over bar 0]parallel to Al2O3[11 (2) over bar 0]. A disordered arrangement is observed inside of the mosaic block of which the collective effect may cause macroscopic residual stresses in the film. (C) 1998 Elsevier Science B.V.X115sciescopu
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