Saturday, 10 May, 2014, 14:23
Posted by Jakub Kawalko
In april we have started the investigations of titanium after deformation by the ECAP technique. We've received two types of samples, one after 4 passes of ECAP route C and other after 8 passes. First some TEM investigations have been performed to reveal bimodal distribution of grain sizes as well as high concentration of lattice defects such as random dislocations and dislocation walls. Those random dislocations were particularly effective in distorting Kikuchi patterns. This in turn prevented us from getting proper diffraction sets for purpose of Orientation Microscopy investigations. With help came new heating holder that have been purchased in our institute allowing for precise annealing of thin foil. The annealing was done just to annihilate some of random dislocations, but not to cause any grain boundary migration. This allowed us to obtain better quality diffractions without changing actual structure of grains in the sample.Posted by Jakub Kawalko
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