Softening and microstructural coarsening without twin formation in FCC metals with low stacking fault energy after processing by high-pressure torsion

Hirotaka Matsunaga, Zenji Horita

    Research output: Contribution to journalArticlepeer-review

    30 Citations (Scopus)

    Abstract

    Gold (Au), silver (Ag) and copper (Cu) were severely deformed through the process of high pressure torsion (HPT). The grain sizes were reduced to the submicrometer range and the hardness increased significantly by the HPT process. However, after holding at room temperature, Au and Ag exhibited grain growth and thus softening without heating. The softening and microstrcutural coarsening occurred rather quickly in Ag and moderately in Au but nothing changed in Cu even after keeping for prolonged time. No twins were formed along with the grain growth in the HPT-processed Au and Ag. High density lattice defects and enhanced diffusivity in the metals are responsible for such an unusual softening behavior.

    Original languageEnglish
    Pages (from-to)1633-1637
    Number of pages5
    JournalMaterials Transactions
    Volume50
    Issue number7
    DOIs
    Publication statusPublished - Jul 2009

    All Science Journal Classification (ASJC) codes

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

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