Atom probe studies of nanostructured alloys

K. Hono, T. Sakurai

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    This paper reviews our recent atom probe studies of nanostructured alloys which are fabricated by three methods: (1) crystallization from metallic glasses, (2) sputter film deposition, and (3) phase decomposition. Alloys with nanograin structures display various interesting magnetic or mechanical properties which are not attainable in conventional alloys. In the first half of this paper, we focus our discussion on the evolution of nanocrsytalline structure from metallic glasses by the primary crystallization process. By atom probe analyses, we found evidence that heterogeneities of one of the alloying elements are present in the initial stage of crystallization. In the later stage of crystallization, one of the slow diffusers controls crystal grain growth. In the second half of this paper, we discuss the nanostructure of CoCr sputtered thin films and CrFe alloys, in which phase separation plays a critical role for controlling magnetic properties. CoCr has an equilibrium two-phase region below 400°C, at which temperature the bulk diffusion is negligible. However, by producing alloy thin films by the sputter deposition method at elevated temperatures (200°C-400°C), we have observed the presence of the equilibrium two-phase state and improved magnetic properties for these films. CrFe films and bulk alloys both show giant magnetoresistance (GMR). The MR value changes depending on the microstructural evolution, and the origins of MR are discussed on the basis of the atom probe results.

    Original languageEnglish
    Pages (from-to)166-178
    Number of pages13
    JournalApplied Surface Science
    Volume87-88
    Issue numberC
    DOIs
    Publication statusPublished - 1995 Mar 2

    ASJC Scopus subject areas

    • Chemistry(all)
    • Condensed Matter Physics
    • Physics and Astronomy(all)
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films

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