{001}〈101〉 Texture Evolution by Preferential Dynamic Grain Growth in Ti–37 mol%Nb Alloy under Plane Strain Compression at High Temperatures

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  • Umezawa Osamu
    Faculty of Engineering, Yokohama National University Center of Advanced Innovation Technologies, Vysoká Škola Báňská - Technical University of Ostrava
  • Hayakawa Yujiro
    Graduate School of Engineering Science, Yokohama National University
  • Schindler Ivo
    Faculty of Materials Science and Technology, Vysoká Škola Báňská - Technical University of Ostrava
  • Fukutomi Hiroshi
    Center of Advanced Innovation Technologies, Vysoká Škola Báňská - Technical University of Ostrava Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University

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<p>{001}⟨101⟩ texture evolution in Ti–37 mol%Nb (Nb–46.5 mass%Ti) alloy was determined under plane strain compression at the temperatures of 800°C, 950°C, and 1100°C, in which preferential dynamic grain growth (PDGG) took place. At lower temperature and higher strain rate such as 800°C–10−2/s, almost no grain growth occurred in the transverse direction (TD), and the α-fiber + near {111}⟨110⟩ in the γ-fiber texture was developed, which was a stable orientation as deformation texture. At higher temperature and lower strain rate such as 1100°C–10−3/s, the grain growth along the TD remarkably appeared by grain boundary bulging, and an extremely high pole density of the texture near the α-fiber, especially the rotated cube {001}⟨101⟩, evolved. A planar dislocation structure with pile-ups appeared and individual dislocations were uniformly distributed in the grains. The rotated cube texture fulfills the conditions of the deformation stability and the low Taylor factor in accordance with the PDGG mechanism. The essential aspect of the mechanism is the preferential growth of grains with a stable orientation for deformation and a low Taylor factor in the given deformation mode.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 65 (3), 282-291, 2024-03-01

    公益社団法人 日本金属学会

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