@article{oai:nagoya.repo.nii.ac.jp:00030751,
 author = {Imura, Toru and Saka, Hiroyasu and Kobayashi, Tatsumasa and Kawabe, Nozomu and Sakai, Akira and Suga, Hisaaki},
 issue = {2},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Mar},
 note = {Crystal growth of pure aluminum, pure gallium and aluminummagnesium alloys has been studied by real time x-ray topography using an ultra high intensity x-ray generator and a Lang-type camera with a heating facility. Faceted growth has been observed in gallium, but not in aluminum. In both cases, however, a dislocation free region has been observed near the solid-liquid interface. Many dislocations were generated behind this region as the interface advanced and also as the growth rate was suddenly changed. Based on the present observations, it is concluded that the Jackson's theory has to be modified at least by taking into account the contribution of the second nearest neighbor atoms in calculating a-parameter. In the case of aluminum-magnesium alloys, it is found that the angle between the primary arm and the secondary arm of a dendrite changes depending on growth rate and solute content. Origin of dislocations induced during crystallization and cooling process are critically discussed and the most probable origin is considered to be vacancy condensation.  Effectiveness of thermal cyclic annealing in the reduction of dislocation density in various types of crystal is experimentally confirmed.},
 pages = {195--262},
 title = {Dynamical studies of microstructural changes of crystals by real time x-ray topography},
 volume = {39},
 year = {1988}
}