, Volume 4, Issue 12, pp 2701-2708

The ω-phase as an example of an unusual shear transformation

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Abstract

The conditions leading to formation of the metastable ω-phase in Ti, Zr, and Hf alloys are described and earlier experimental observations directly related to ω -phase formation are summarized. New experimental results are presented which show that increased oxygen content suppresses athermal ω-phase formation in Ti-V alloys. A mechanism of ω-phase formation based on the formation of a linear displacement defect is described and it is shown that both the earlier and new experimental results are consistent with this mechanism. Additional experimental results on variations in electrical and physical properties in Ti alloys are also shown to be consistent with the linear displacement defect model.

This paper is based on a presentation made at a symposium on “Phase Transformations in Less Common Metals: A Dialogue,” held at the Fall Meeting in Cleveland on October 16, 1972, under the sponsorship of the Phase Transformations Activity, Materials Science Division, American Society for Metals.