Interaction between dislocation and copper particles in Fe-Cu alloys

Koichi Nakashima, Yuichi Futamura, Toshihiro Tsuchiyma, Setsuo Takaki

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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.
Publication statusPublished - Dec 1 2002

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All Science Journal Classification (ASJC) codes

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

Cite this

Nakashima, K., Futamura, Y., Tsuchiyma, T., & Takaki, S. (2002). Interaction between dislocation and copper particles in Fe-Cu alloys. isij international, 42(12 SPEC.), 1541-1545.