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An Evaluation of Homogeneity and Heterogeneity in Metals Processed by High-Pressure Torsion

100%
Figueiredo R., Kawasaki M., Langdon T.
Acta Physica Polonica A
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2012
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vol. 122
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issue 3
425-429
EN
Processing through the use of high-pressure torsion is attracting much attention at the present time because of the potential for achieving exceptional grain refinement. In principle, it appears that the thin disks used for high-pressure torsion processing should exhibit significant heterogeneity in the as-processed condition. However, experiments show that the development of homogeneity or heterogeneity is dependent upon the crystalline structure of the material. For high-purity aluminum the as-processed microstructure is very homogeneous after five or more revolutions of torsional straining but for the magnesium AZ31 alloy there is a considerable degree of heterogeneity in the as-processed disks.
2
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X-Ray Structure Perfection Diagnostics of Slightly Distorted Silicon Crystals in the Bragg Case of Diffraction

100%
Khrupa V., Krasulya S., Machulin V., Datsenko L., Auleytner J.
Acta Physica Polonica A
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1997
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vol. 91
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issue 5
981-985
EN
A new approach to structure perfection diagnostics of dislocation-free silicon crystals has been developed using the Bragg case of diffraction. The approach is being based on successive measurements of integral reflectivity and the spatial intensity distribution of reflected beam on the same diffraction planes of a real crystal by means of a single crystal diffractometer.
3
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Orientation of Single Dibenzanthanthrene Molecules in Solid Xenon

80%
Sepioł J., Kołos R., Jasny J.
Acta Physica Polonica A
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2007
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vol. 112
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issue S
S-121-S-126
EN
The spatial distributions of individual dibenzanthanthrene electronic transition dipole moments in solid Xe was investigated at the single molecule level, with the high-resolution fluorescence spectroscopy. Samples were prepared by the co-deposition of dibenzanthanthrene/Xe vapours onto the 50 K surface. The results indicate that the orientation of planar aromatic molecules is preferentially parallel to the trapping surface.
4
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Structure Perfection Diagnostics of Single Crystals by Means of Diffractometry Measurements Using X-Ray Continuous Spectrum

80%
Datsenko L. I., Khrupa V. I.
Acta Physica Polonica A
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1994
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vol. 86
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issue 4
579-584
EN
Determination of the integral characteristics of structural perfection of a real crystal (i.e. Debye-Waller's static factor e^{-L} and coefficient of absorption lids due to diffuse scattering) is especially expedient using the suitably selected wavelengths of the X-ray continuous spectrum by investigation of the thickness I(t), coordinate I(x) as well as amplitude I(W) dependencies of intensities at Lane or Bragg diffraction. Here W is an amplitude of weak ultrasound vibrations excited in a sample for suppression of the Bragg component of reflectivity.
5
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Macroscopic and Microscopic Descriptions of the Plastic Deformation of Fcc Metals over a Wide Range of Strain and Temperature

70%
Csanádi T., Chinh N., Gubicza J., Langdon T.
Acta Physica Polonica A
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2012
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vol. 122
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issue 3
630-633
EN
The plastic behavior of face-centered cubic metals was investigated over a wide range of strain and testing temperature. The experimental stress-strain data were described using both macroscopic and microscopic, well-established relationships. The characteristics of these descriptions are discussed and compared with each other. The analysis of the characteristics leads to a definition of the low and high temperature deformation regions, where the kinetics of both the dislocation-multiplication and the dislocation-annihilation (recovery) are different. For pure aluminum, it is shown that the boundary between these two regions occurs at a homologous temperature of the order of ≈ 0.5 T_{m} where T_{m} is the absolute melting temperature. From this analysis, correlations are also drawn between the macroscopic parameters describing the stress-strain relationship and the fundamental characteristics of the microscopic processes both at room temperature and elevated temperatures.
6
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NiTi Shape Memory Marformed Alloy Studied by Electron Beam Precession TEM Orientation Mapping Method

61%
Świec P., Zubko M., Lekston Z., Stróż D.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1307-1310
EN
Severe plastic deformation by cold-rolling in martensitic state was applied to Ni_{50.4}Ti_{49.6} shape memory alloy. Received materials with 17, 20, 25, and 35% deformation were further annealed at 450°C for 15 min. After such treatment hardness of this alloy increased significantly reaching 365 HV0.5 for highest deformation degree. Calorimetric studies revealed two-stage and two-step character of martensitic transformation occurring in all specimens. Nanocrystalline structure with average grain size 53, 34, 28, and 24 nm was obtained. In material with 35% of deformation amorphous regions containing a nuclei of B2 parental phase with average size of 5 nm were observed. To determine the crystallographic orientation of observed nanograins and for better phase analysis, electron beam precession transmission electron microscopy orientation mapping was performed.
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