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An investigation of the zirconium-rich corner of the zirconium-titanium-niobium constitutional diagram is described. X-ray techniques and metallography were used. A high-temperature x-ray goniometer attachment was employed to construct ternary isopleths. Isothermal sections and lattice parameter measurements are also outlined. The occurrence of a transitional ω -phase identified tentatively as tetragonal, is noted. The ternary constitutional data presented represent essentially a survey of the zirconium-rich corner and more detailed results must await further work. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate

An investigation of creep deformation in pure zirconia, using a creep-in-bending method with programmed temperature increase, showed the occurrence of superplasticity at temperatures near the monoclinic to tetragonal phase transformation. An interesting phenomenon was observed in a temporary halt to the creep process which occurred with continuing temperature increase beyond the phase transformation. Temperature dependence tests at a maximum fibre stress of 3140 psi gave overall activation energies for the creep process in pure zirconia in the monoclinic and tetragonal phases of 44 and 103 kcal/mole respectively. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate

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No description available.

No description available.