Low-temperature anatase-to-rutile phase transformation and unusual grain coarsening in titanium oxide nanopowders by high-pressure torsion straining

Kaveh Edalati, Qing Wang, Hadi Razavi-Khosroshahi, Hoda Emami, Masayoshi Fuji, Zenji Horita

    研究成果: Contribution to journalArticle査読

    17 被引用数 (Scopus)

    抄録

    Simultaneous effect of pressure, temperature and plastic strain on structural evolution of titania ceramic nanopowder was investigated using the high-pressure torsion (HPT) method. Unlike static annealing, in which the anatase-to-rutile phase transformation occurred at 1173 K, the transformation was observed at low temperatures as 473–573 K by HPT processing. The formation of rutile phase accompanied with dynamic recrystallization and an unusual grain growth, indicating that severe plastic deformation at low homologous temperatures does not necessarily result in grain refinement of metastable nanoceramics. Besides the coarsened grains of rutile phase, a high-pressure TiO2-II columbite phase was also detected in small nanograins.

    本文言語英語
    ページ(範囲)341-344
    ページ数4
    ジャーナルScripta Materialia
    162
    DOI
    出版ステータス出版済み - 3 15 2019

    All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学
    • 金属および合金

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