Nanoindentation study of short-range ordering

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

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)


    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
    Issue number4
    Publication statusPublished - 25 Jan 2019
    MoE publication typeA1 Journal article-refereed


    The study was carried out at Aalto University, Finland and VTT, Finland within the 'Thermal ageing and EAC research for plant life management' (THELMA) project of the Finnish Research Programme on Nuclear Power Plant Safety 2015–2018 (SAFIR 2018). The study was concluded at the Paul Scherrer Institute PSI, Switzerland with funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Action COFUND grant agreement N° 701647.


    • Alloy 690
    • Csm
    • Hardness
    • Nanoindentation
    • Ordering


    Dive into the research topics of 'Nanoindentation study of short-range ordering'. Together they form a unique fingerprint.

    Cite this