Lattice softening for producing ultrahigh strength of iron base nanocrystalline alloy

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

Research output: Contribution to journalArticle

25 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 - Dec 14 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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