Interaction between dislocation and copper particles in Fe-Cu alloys

Koichi Nakashima, Yuichi Futamura, Toshihiro Tsuchiyama, Setsuo Takaki

    Research output: Contribution to journalArticlepeer-review

    73 Citations (Scopus)

    Abstract

    The strengthening mechanism due to copper (Cu) particles was discussed in terms of the interaction between dislocation and Cu particles in aged Fe-Cu alloys. Since Cu particles are softer than the iron matrix, its interaction with dislocation is different from that with the Orowan mechanism. The moving dislocations can cut the soft Cu particles and pass through them when the bowing angle reaches some critical value (θc), and the precipitation strengthening due to Cu particles is expressed as a function of mean particle spacing (λ) and the θc (π/2nil gives Orowan stress). The θc increased with increasing the size of Cu particles and reached π/2 when the Cu particle size became 70 nm. This means that the precipitation strengthening due to Cu particles is dependent on not only λ but also the Cu particle size, and 70 nm is the minimum Cu particle size for obtaining the Orowan stress.

    Original languageEnglish
    Pages (from-to)1541-1545
    Number of pages5
    Journalisij international
    Volume42
    Issue number12 SPEC.
    DOIs
    Publication statusPublished - 2002

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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