Effect of fine precipitation of coherent disordered phase on creep strength of L12-ordered Co3Ti

H. Takesue, K. Oh-ishi, Z. Horita, M. Nemoto

    研究成果: ジャーナルへの寄稿学術誌査読

    8 被引用数 (Scopus)

    抄録

    Compressive creep tests were performed under constant stress over a range of temperatures from 923 to 1073 K on precipitation strengthened L12-ordered Co3Ti. The creep rates decrease appreciably by the fine precipitation of coherent disordered f.c.c. Co-rich phase when the applied stress is low. An analysis of the creep data is developed taking a threshold stress into account of the creep equations. The significance of the threshold stress is discussed based upon the transmission electron microscope observations of the interaction between dislocations and precipitates. The superdislocations produced during deformation tend to be strongly attracted and dissociate as they meet the coherent disordered precipitates because the anti-phase boundary energy in the disordered phase is zero. The extra stress necessary to pull the dislocation out of the precipitates may play an important role to establish the threshold stress which is expected to be beneficial to the improvement of the creep strength of L12-ordered intermetallics for high temperature structural applications.

    本文言語英語
    ページ(範囲)479-484
    ページ数6
    ジャーナルMaterials Science and Engineering A
    239-240
    1-2
    DOI
    出版ステータス出版済み - 12月 1997

    !!!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

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