Fim-atom probe study of the precipitation in A Ti46.3 * Ni53.7 alloy

J.J. Swens, P.F. Willemse, J. Beyer

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    Abstract

    The precipitation process in a B2-TiNi-alloy has been studied during aging between 873-973 K for various aging times. Earlier reported results obtained with TEM/EDX-analyses showed the development of three different precipitates. The compositions, based on crystallographic calculations were found to be between 55-65 at % Ni. In the present study FIM/AP-analyses have been used to verify these compositional variations. At the early stages of precipitation only Ti3Ni4 is formed which could be analysed both by EDX as well as FIM/AP-analysis. The results of AP-analysis seem to be in better agreement with the calculated value of 57.1 at % Ni than the EDX results. The FIM images of the alloys show no crystallographic poles which is ascribed to the heavily twinned martensite transformation of the ordered B2-phase during cooling in the FIM. The Ti3Ni4-phase could be identified in the FIM images by the brightness and clear pole formation. The Ti2Ni3- and the Ti5Ni9-phase showed very brittle behaviour in the FIM, and AP-analyses showed better agreement with the calculated values than EDX, but can not be treated as conclusive yet.
    Original languageEnglish
    Pages (from-to)359-364
    JournalJournal de Physique
    Volume49
    Issue numberC-6
    DOIs
    Publication statusPublished - Nov 1988
    Event35th International Field Emission Symposium 1988 - Oak Ridge, United States
    Duration: 18 Jul 198822 Jul 1988
    Conference number: 35

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