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Title: Grain boundary energies in copper
Author: Omar, Ramli
ISNI:       0000 0001 3458 9288
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1987
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The dependence of grain boundary energy on boundary orientation was studied in copper annealed at 1000°C. Grain boundary orientations and the disorientations across the boundaries were measured. A rotation matrix notation is used to interpret selected area electron channelling patterns observed in a scanning electron microscope. The Herring and Shewmon torque terms were investigated using wire specimens having a "bamboo" structure. The Herring torque terms were determined using the Hess relation. The (110) section of the Σ11 γ-plot (i.e. the variation of grain boundary energy with boundary orientation) was evaluated. In this plot, minima in energies were found at the (311) and (332) mirror planes. Σ3 and Σ9 boundaries were investigated in sheet specimens. The (110) and (111) sections of the Σ3 γ-plot were evaluated. In addition to the sharp cusps occurring at the Σ3 (111) planes, the further shallower cusps occur at the incoherent Σ3 boundaries with the interfacial planes approximately parallel to {322} in one crystal and {11.44} in the other crystal. Flat and curved Σ9 boundaries were investigated. The break up of Σ9 boundaries into two Σ3 boundaries and the relation between the Σ3 and Σ9 γ-plots was also examined. The (110) section of the Σ9 γ-plot was constructed.
Supervisor: Not available Sponsor: Kementerian Pengajian Tinggi, Malaysia
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics