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Transmission electron microscopic observations of mechanical twinning in metastable beta titanium alloys

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Abstract

Microstructure and crystallography of a stress-induced plate in metastableβ titanium alloys, Ti-V, Ti-Mo, Ti-Nb, Ti-Fe, were investigated by a combination of two surface trace analysis and transmission electron microscopy. Stress-inducedω phase transformation or {332} 〈113〉 twinning appeared in circumstances whereβ phase was very unstable. It was found that there were two types of {332} 〈113〉 twinning, depending on whether one variant ofω phase was preferentially induced in a twin or not. Stress-inducedω phase not relating to {332} 〈113〉 twinning was not observed in matrix. This suggests that stress-inducedω phase transformation is accompanied with {332} 〈113〉 twinning. Preferential formation of oneω variant was influenced not only by alloy system and its composition, but also by cooling rate from solution treatment temperature. The relation between athermalω structure and stress-inducedω phase transformation or plastic deformation mode is also discussed.

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Authors and Affiliations

  1. The Research Institute for Iron, Steel and Other Metals, Tohoku University, 2-1-1, Katahira, 980, Sendai, Japan

    S. Hanada (Instructor) & O. Izumi (Professor)

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  1. S. Hanada
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  2. O. Izumi
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Hanada, S., Izumi, O. Transmission electron microscopic observations of mechanical twinning in metastable beta titanium alloys. Metall Trans A 17, 1409–1420 (1986). https://doi.org/10.1007/BF02650122

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