Geçirimli elektron mikroskobu ile in-situ ve devinimli elektron difraksiyonu teknikleri kullanılarak malzeme karakterizasyonu

The goal of this thesis is the characterization of different type of materials by using in-situ heating for the investigation of sintering behavior and by using precession electron diffraction (PED) method for the determination orientation relations between present phases and phase analysis. In SiC-hBN ceramic composite, orientation relations of in-situ formed hBN with SiC phases, twist boundary character within hBN particles were characterized with PED method. B4C-TiB2 composites produced with different methods were investigated. In R-SPS'ed sample, orientation relation between in-situ formed graphite and TiB2 phases was studied and reactions occur during R'SPS are discussed. In hot pressed samples, addition of WC and different mixing methods resulted in formation of different core-rim type structures were carried out. SEM and XRD results of hot pressed sample showed the variation of microstructure and mechanical properties were measured depending on the pressing direction. In β-SiAlON-cBN ceramic composites orientation relation between in-situ formed hBN transformation layer and cBN particles were investigated to understand its formation mechanism. In X70 petroleum steel, phase analysis of the precipitate particles were studied. In addition to these studies, characterization of Ar implantation into hBN depending on the orientation of particles were carried out. Lastly, in-situ sintering of ZnO nano particles in TEM was studied.