Lattice softening for producing ultrahigh strength of iron base nanocrystalline alloy

S. Kuramoto, T. Furuta, N. Nagasako, Z. Horita

    Research output: Contribution to journalArticlepeer-review

    28 Citations (Scopus)

    Abstract

    One can increase the strength of metallic materials by pinning dislocations with nanoscale obstacles, as the dislocations facilitate plastic deformation. However, simultaneous achievement of the ultrahigh strength and the ductility is extremely difficult in conventional metallic materials. Here we show that the ultrahigh strength iron base alloy with enhanced ductility, whose strength is approaching ideal strength and being twice as much as the upper limit of conventional alloys, can be realized by introducing the paradox concept of lattice softening. Designing atomic arrangement with specific electronic structure creates the lattice softening, and a nanograined structure is then produced by subsequent processing with severe plastic deformation.

    Original languageEnglish
    Article number211901
    JournalApplied Physics Letters
    Volume95
    Issue number21
    DOIs
    Publication statusPublished - 2009

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy (miscellaneous)

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