Precipitation strengthening at elevated temperature in Fe-Cu alloys

Koichi Nakashima, Yuichi Futamura, Toshihiro Tsuchiyama, Setsuo Takaki

    研究成果: ジャーナルへの寄稿学術誌査読

    11 被引用数 (Scopus)


    The mechanism of strengthening by copper (Cu) particles at 873K was discussed in terms of the interaction between dislocation and Cu particles in aged Fe-Cu alloys. The moving dislocation was pinned by the Cu particles and passed through them when the bowing angle reached some critical value (θc). The value of θc at 873K was around 33 degree regardless of the Cu particle size, although the θc at room temperature increased with an increase in the diameter of particle. This indicates that the interaction at 873K is significantly different from that at room temperature. TEM observation for the 3%Cu steel deformed by 1.9% at 873K revealed that the strain around dislocation is released at the particle/matrix interface and the attractive interaction is working between the dislocation and the Cu particles. The precipitation strengthening was evaluated by considering the effect of mean particle spacing (λ) and the θc, and it was found that the increment of yield stress was smaller than the Orowan stress.

    ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    出版ステータス出版済み - 2003

    !!!All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 物理化学および理論化学
    • 金属および合金
    • 材料化学


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