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Orientation Mapping and In Situ Annealing Applied for Characterization of Changes in Aluminium Alloys after Deformation

100%

Bieda M.

nr 4

979-981

The paper presents application of combined in situ annealing and orientation mapping technique for investigation the microstructural changes in the aluminium alloy 6013 with bimodal distribution of the second phase particles during recovery and recrystallization processes. Information about grain distribution, misorientation between grains, size and shape of the grains at each stage of recrystallization process were obtained. Complexity of the experimental procedure is defined and discussed in order to avoid artificial results. Although the article described the advantages and disadvantages of those method used in transmission electron microscopy and scanning electron microscopy in the work the results from scanning electron microscopy/electron backscattering diffraction in situ heating experiments are highlighted. Obtained data are in a good agreement with previous transmission electron microscopy and calorimetry studies.

Characterization of Precipitates in Aluminium Alloy 6013 after Cold-Rolling and Annealing

63%

Bieda M. , Jarzębska A.

nr 4

988-990

The aim of the present work was to observe changes in precipitations during annealing after cold-rolling. Series of the samples from cold-rolled AA6013 were prepared and compared to undeformed samples. The samples were annealed at the temperatures equal to 260, 490°C for undeformed state and at 280, 360, and 530°C for cold-rolled state. For investigation thin foils were prepared. Chemical composition and crystal structure of precipitates was analysed and described using transmission electron microscopy imaging, X-ray energy-dispersive spectroscopy and selected-area diffraction techniques. The researches indicated that low annealing temperatures caused dissolution of metastable β and Q phases. With increasing temperature there also occurred growth of Q phase. At highest annealing temperatures there were noticed precipitations of β phase again. Microstructural observation also revealed an impact of those particles on recrystallization processes.

Analysis of computational complexity in holographic lens-less projection

38%

Kowalczyk A. , Bieda M. , Makowski M. , Ducin I. , Kakarenko K. , Suszek J. , Sobczyk A.

nr 3

84-86

In lens-less projection the illuminating wavefront must be modified, so that after propagation on a certain distance it would form an image on the screen. Formed images will be displayed with a frame rate minimum of 20fps in the case of an animated movie. Thus, the speed of computing is extremely important. Computing might be performed by the central processing unit (CPU) or the graphics processing unit (GPU). Reaching a compromise between computational complexity (as well as the time of computing) and the quality of an obtained image is needed. This leads to a need for a proper iteration number of an algorithm, its parameters and size of computing matrices.