Abstract
Two types of lamellar γ-phases are observed in cold-rolled pure α-Ti: the P-type adopting [0001]α//[001]γ and (101¯0)α//(110)γ, and the B-type adopting [21¯1¯0]α//[101]γ and (0001)α//(1¯1¯1)γ. By using high-resolution transmission electron microscopy, selected area electron diffraction and stereographic projection, the γ-phase is identified to have a face-centered tetragonal (fct) structure. In situ heating experiment further confirms the γ-phase to be hydride (TiH) precipitate in α-Ti. This work provides convincing evidences that the so-called stress-induced face-centered cubic (fcc) martensite in deformed α-Ti reported previously could be mistakenly identified. Available approaches to distinguish the fcc-Ti martensite from the fct-hydride are also discussed.
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