| Applicability of Monte-Carlo method for the textural and microstructural changes during annealing processes is studied. Models that are developed for explaining annealing processes are incorporated into Monte-Carlo procedures and the textural and microstructural changes are then followed. The simulated results are compared with the experimental observations to validate the proposed models, The three exemplary annealing processes selected for the present work are industrially important and diversified in their annealing characteristics, These are: (I) Cube {lcub}100{rcub}⟨001⟩ texture development during recrystallization of Al, (II) Abnormal grain growth of Goss {lcub}110{rcub}⟨001⟩ grains in Fe-Si steels, (III) The competition between (111) and (100)-fiber textures during annealing of nanocrystalline Ni and Ni-Fe alloy electrodeposits. The model for each annealing process is developed by analyzing the relevant metallurgical information obtained from the corresponding metals and alloys prior to annealing,; In Application-I, the texture and orientation-dependent stored energy measurements have been made on the cold rolled can-body aluminum alloy and the detailed discussion is presented, These results are analyzed for developing nucleation and growth models that would lead to the final cube texture formation during primary recrystallization of aluminum. The proposed recrystallization model for aluminum predicts the development of cube texture and equiaxed grain structure as observed in experiments.; For the abnormal grain growth in Fe-Si steel (Application-II), the role of high energy grain boundaries has been studied in detail using separate computer experiments to understand the importance of fraction of high mobility grain boundaries. From these experiments, it has been proved that the assumption of high mobility to CSL boundaries for the abnormal growth of Goss grains is not valid.; Finally, the Monte-Carlo procedure is employed for testing the proposed model for the texture competition between (111) and (100)-fibers in nanocrystalline Ni, Ni-20% Fe and Ni-45% Fe electrodeposits (Application-III). Based on the texture analysis, the proposed model assumes high mobility to the grains boundaries, which are in high non-equilibrium states. The results of the Monte-Carlo simulation using the proposed model are compared with experiments, The simulated results show that (111)-fiber grows faster than (100)-fiber as annealing progresses. (Abstract shortened by UMI.)... |
