APFIM STUDIES OF SEGREGATION AND SOLUTE-DEFECT INTERACTIONS IN METALS.

D. R. Hess, Kamal Al-Saleh, Kenji Murakami, Toshio Sakurai, H. W. Pickering

    Research output: Contribution to journalConference articlepeer-review

    Abstract

    The atom-probe field ion microscope (APFIM) is capable of obtaining both microstructural and chemical information from a sample on an atomistic scale not accessible by any other technique. A schematic is shown. The sample is in the form of a sharp tip which has been electrochemically polished to an end radius of 100-1000 A. After cooling the sample to 25 K by a closed-cycle refrigeration system, pressure in the field ion microscope (FIM) chamber is in the 10** minus **1**1 torr range. Image resolution of the FIM is on the order of a few A and surface atoms are imaged. Mass resolution of the atom-probe is better than 1000, which is more than sufficient to resolve metal isotopes and their hydrides. Detectability is close to the theoretical limit, which is determined mainly by the efficiency (55%) of the channel plate detector.

    Original languageEnglish
    Pages (from-to)65-67
    Number of pages3
    JournalProceedings, Annual Conference - Microbeam Analysis Society
    Publication statusPublished - 1984 Dec 1

    ASJC Scopus subject areas

    • Engineering(all)

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