The structure and morphology of the near-surface area in FeTi and NiTi compounds after activation treatment

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Abstract

The prehydrogenation activation of FeTi is a subject of current controversy. No agreement exists regarding the presence of metallic iron clusters and various suboxide compounds in the surface layers of activated FeTi. In order to gain more insight into these issues we carried out a transmission electron microscopy study of the near-surface area of FeTi and NiTi samples which had been activated by heat treatments at various partial oxygen pressures. These treatments of FeTi result in the formation of oxygen-stabilized Fe3-xTi3+xOy precipitates and of titanium and iron oxides. No free iron precipitates were detected. We observed the presence of the corresponding nickel compounds in activated NiTi and, in addition, NiTiO3 and free nickel precipitates. The results indicate a high sensitivity of the near-surface layers to the parameters involved in the activation treatment, e.g. partial oxygen pressure, temperature and duration.

Original languageEnglish
Pages (from-to)361-366
Number of pages6
JournalJournal of the Less-Common Metals
Volume103
Issue number2
DOIs
StatePublished - 15 Nov 1984

ASJC Scopus subject areas

  • Engineering (all)

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