The role of stacking faults and twin boundaries in grain refinement of a Cu-Zn alloy processed by high-pressure torsion

Y. B. Wang, X. Z. Liao, Y. H. Zhao, E. J. Lavernia, S. P. Ringer, Z. Horita, T. G. Langdon, Y. T. Zhu

    Research output: Contribution to journalArticlepeer-review

    109 Citations (Scopus)

    Abstract

    A recent model developed to predict the smallest grain sizes obtainable by severe plastic deformation has worked well for materials with medium to high stacking fault energies (SFEs) but not for those with low SFEs. To probe this issue, experiments were conducted using a Cu-30wt.% Zn alloy with a very low SFE of 7mJ/m2 as the model material. High-pressure torsion was used as the grain refinement technique. The results indicate that stacking faults and twin boundaries play a key role in the grain refinement process such that the smallest achievable grain size is determined by the highest stacking fault and twin density that the system is able to produce. An amorphization of grain boundaries was also observed in the final structure. These observations are very different from those reported for materials having medium to high SFEs and they confirm the operation of a different grain refinement mechanism.

    Original languageEnglish
    Pages (from-to)4959-4966
    Number of pages8
    JournalMaterials Science and Engineering A
    Volume527
    Issue number18-19
    DOIs
    Publication statusPublished - Jul 2010

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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