Mechanism of α→α2+γ phase separation in hypo-eutectoid Ti-37 at%Al alloy

Makoto Tanimura, Yasuhide Inoue, Yasumasa Koyama

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Features of the α→α2+γ phase separation in a hypo-eutectoid Ti-37 at%Al alloy were investigated by transmission electron microscopy. Note that the eutectoid reaction in the Ti-Al alloy system takes place at 1398 K in an Al concentration of 40 at%. The present data clearly show that in the hypo-eutectoid alloy the α2+γ lamellar structure is formed in an equilibrium state, just as in cases of the eutectoid and hyper-eutectoid alloys. A characteristic feature in the hypoeutectoid alloy is the appearance of the amorphous state as an intermediate state. In other words, the sequence of the formation of the lamellar structure is the same as that in the eutectoid alloy, not in the hyper-eutectoid alloy. It can be therefore concluded that there are two types of the processes for the lamellar-structure formation in the phase separations of the Ti-Al alloy system.

    Original languageEnglish
    Pages (from-to)57-61
    Number of pages5
    Journalmaterials transactions, jim
    Volume39
    Issue number1
    Publication statusPublished - 1998 Jan

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    Phase separation
    Lamellar structures
    Transmission electron microscopy
    transmission electron microscopy

    Keywords

    • Amorphous state
    • Hypo-eutectoid alloy
    • Ordered structure
    • Phase separation
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Mechanism of α→α2+γ phase separation in hypo-eutectoid Ti-37 at%Al alloy. / Tanimura, Makoto; Inoue, Yasuhide; Koyama, Yasumasa.

    In: materials transactions, jim, Vol. 39, No. 1, 01.1998, p. 57-61.

    Research output: Contribution to journalArticle

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    abstract = "Features of the α→α2+γ phase separation in a hypo-eutectoid Ti-37 at{\%}Al alloy were investigated by transmission electron microscopy. Note that the eutectoid reaction in the Ti-Al alloy system takes place at 1398 K in an Al concentration of 40 at{\%}. The present data clearly show that in the hypo-eutectoid alloy the α2+γ lamellar structure is formed in an equilibrium state, just as in cases of the eutectoid and hyper-eutectoid alloys. A characteristic feature in the hypoeutectoid alloy is the appearance of the amorphous state as an intermediate state. In other words, the sequence of the formation of the lamellar structure is the same as that in the eutectoid alloy, not in the hyper-eutectoid alloy. It can be therefore concluded that there are two types of the processes for the lamellar-structure formation in the phase separations of the Ti-Al alloy system.",
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    AB - Features of the α→α2+γ phase separation in a hypo-eutectoid Ti-37 at%Al alloy were investigated by transmission electron microscopy. Note that the eutectoid reaction in the Ti-Al alloy system takes place at 1398 K in an Al concentration of 40 at%. The present data clearly show that in the hypo-eutectoid alloy the α2+γ lamellar structure is formed in an equilibrium state, just as in cases of the eutectoid and hyper-eutectoid alloys. A characteristic feature in the hypoeutectoid alloy is the appearance of the amorphous state as an intermediate state. In other words, the sequence of the formation of the lamellar structure is the same as that in the eutectoid alloy, not in the hyper-eutectoid alloy. It can be therefore concluded that there are two types of the processes for the lamellar-structure formation in the phase separations of the Ti-Al alloy system.

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