Nanoindentation study of short-range ordering

Roman Mouginot (Corresponding Author), Teemu Sarikka, Ulla Ehrnstén, Hannu Hänninen

    Research output: Contribution to journalArticle

    Abstract

    Thermal ageing of nickel-base alloys can lead to the formation of brittle ordered phases, but the direct study of these phases is challenging. Nanoindentation is used in this study as an alternative technique to determine the extent of short-range ordering (SRO) in thermally aged Alloy 690 TT. Two methods are used for obtaining both qualitative (depth sensitivity) and quantitative (spatial stability) results, which are compared to data from metallography, microhardness and atomic force microscopy in order to discriminate between factors affecting the hardness. When intergranular precipitation and grain size become dominant factors with increasing indentation loads, nanoindentation at low loads enables to distinct within-grain hardness increase related to SRO.

    Original languageEnglish
    Article number045052
    Number of pages8
    JournalMaterials Research Express
    Volume6
    Issue number4
    DOIs
    Publication statusPublished - 25 Jan 2019
    MoE publication typeNot Eligible

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    Keywords

    • Alloy 690
    • Csm
    • Hardness
    • Nanoindentation
    • Ordering

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