Influence of dislocation-solute atom interactions and stacking fault energy on grain size of single-phase alloys after severe plastic deformation using high-pressure torsion

Kaveh Edalati, Daichi Akama, Asuki Nishio, Seungwon Lee, Yosuke Yonenaga, Jorge M. Cubero-Sesin, Zenji Horita

Research output: Contribution to journalArticle

111 Citations (Scopus)

Abstract

Several pure metals (magnesium, aluminum, iron, cobalt, nickel, copper, zinc, palladium and silver) and single-phase Al-Mg, Al-Ag, Al-Cu, Cu-Al, Cu-Zn, Pd-Ag, Ni-Fe and Ni-Co alloys were processed by severe plastic deformation using high-pressure torsion (HPT). The steady-state grain size was decreased and hardness increased by alloying in all the systems. It was shown that the dominant factor for extra grain refinement by alloying was due to the effect of solute-matrix atomic-size mismatch and modulus interaction on the mobility of edge dislocations. For the selected alloys, unlike pure metals, the grain size was almost insensitive to the melting temperature, and like pure metals, no systematic correlation was established between the grain size and stacking fault energy (chemical interaction) or between the grain size and valence electrons (electrical interaction). The presence of a power-law relation, with n ≈ 0.56, between the hardness normalized by the shear modulus and grain size normalized by the Burgers vector signified the large contribution of grain boundaries to the hardening. The contribution of the solid-solution effect to the total hardening appeared to be <15%.

Original languageEnglish
Pages (from-to)68-77
Number of pages10
JournalActa Materialia
Volume69
DOIs
Publication statusPublished - May 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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