Abstract
Transmission electron microscopy has been employed to study the microstructural processes that occur prior to the detection of the isothermal omega phase in beta stabilized TiCr binary alloys. The alloy compositions were selected to provide a suitable incubation period prior to the initiation of the omega phase during isothermal aging. It has been observed that the metastable beta phase undergoes a phase separation reaction, ß → ß 1 + ß 2 prior to the detection of the omega phase in the TiCr alloys. The ß 2 precipitate regions produced by this reaction do not act as preferred sites for the subsequent nucleation of the omega phase.
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