Nucleation Behaviour of β to ω Phase Transformations in β-Type Ti-Mo Alloys

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  • Sukedai E.
    Faculty of Engineering, Okayama University of Science
  • Shimoda M.
    Faculty of Engineering, Okayama University of Science
  • Nishizawa H.
    Faculty of Engineering, Okayama University of Science
  • Nako Y.
    Faculty of Engineering, Okayama University of Science

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Other Title
  • Nucleation behaviour of v to o phase transformations in v type Ti Mo alloys
  • Nucleation Behaviour of β to ω Phase Transformations in β-Type Ti-Mo Alloys

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Abstract

Nucleation behaviour of β to ω phase transformations in β-type Ti alloys has been investigated using electron microscopy in four cases; (1) along the {112}⟨11\\bar1⟩ twin boundary, at which compressive stress occurs, (2) by means of aging under tensile stressing, (3) on the effects on the amounts of quenched-in vacancy in specimens quenched-in from two different temperatures, and (4) due to cooling to 131 K. Results show that the formation of nucleation-sites is enhanced by both compressive-stress along the twin boundary and tensile-stress during aging. In a specimen quenched from a higher temperature, the formation of nucleation-sites increases. It is considered that quenched-in vacancies and their clusters become nucleation-sites of β to ω phase transformations. The phase transformation occurs due to cooling to 131 K. It is also found that the formation of new nucleation-sites cannot be reproduced and that they moved randomly.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 52 (3), 324-330, 2011

    The Japan Institute of Metals and Materials

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