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Hydride or martensite? Identification of a new phase in cold-rolled hexagonal close-packed Ti
Materials Characterization ( IF 4.7 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.matchar.2020.110294
Zongde Kou , Lixia Yang , Yanqing Yang , Xian Luo , Bin Huang

Abstract Two types of lamellar γ-phases are observed in cold-rolled pure α-Ti: the P-type adopting [0001]α//[001]γ and (10 1 ¯ 0)α//(110)γ, and the B-type adopting [2 1 ¯ 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.

中文翻译:

氢化物还是马氏体?冷轧六方密堆积钛中新相的鉴定

摘要 在冷轧纯α-Ti中观察到两种类型的层状γ相:采用[0001]α//[001]γ和(10 1 ¯ 0)α//(110)γ的P型相,以及B型采用[2 1¯ 1 ¯ 0]α//[101]γ和(0001)α//( 1¯ 1 ¯ 1 )γ。通过使用高分辨率透射电子显微镜、选区电子衍射和立体投影,γ 相被确定为具有面心四方 (fct) 结构。原位加热实验进一步证实了γ相是氢化物(TiH)在α-Ti中析出。这项工作提供了令人信服的证据,即先前报道的变形 α-Ti 中所谓的应力诱导面心立方 (fcc) 马氏体可能被错误地识别。还讨论了区分 fcc-Ti 马氏体和 fct-氢化物的可用方法。
更新日期:2020-05-01
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