Alloy Development, Processing and Characterization of Devitrified Titanium Base Microcrystalline Alloys

摘要

The effect of rapid solidification on solid solubility, microstructural refinement and phase transformation in binary and ternary titanium alloys was studied. The stability of the refined microstructures produced by rapid quenching were investigated under the isothermal and isochronal conditions. In particular, Ostwald ripening of rare earth (Y, La, Er) and Thorium dispersoids in Ti-Sn-X (Y, La, Er, Th) systems at elevated temperatures (700-900 C, phase) was investigated by transmission electron microscopy and image analyzer. The grain growth rate at the presence of the rare earth and Th dispersoids was investigated and determined as a function of time. The deterioration of microhardness in the ternary alloys containing rare earth dispersions upon high temperature annealing was studied in relation to microstructural coarsening.