Nanoindentation study of short-range ordering

Roman Mouginot; Teemu Sarikka; Ulla Ehrnstén; Hannu Hänninen

doi:10.1088/2053-1591/aafeaf

Nanoindentation study of short-range ordering

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

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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 language	English
Article number	045052
Number of pages	8
Journal	Materials Research Express
Volume	6
Issue number	4
DOIs	https://doi.org/10.1088/2053-1591/aafeaf
Publication status	Published - 25 Jan 2019
MoE publication type	Not Eligible

Keywords

Alloy 690
Csm
Hardness
Nanoindentation
Ordering

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title = "Nanoindentation study of short-range ordering",

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.",

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AU - Mouginot, Roman

AU - Sarikka, Teemu

AU - Ehrnstén, Ulla

AU - Hänninen, Hannu

N1 - Project 117761

PY - 2019/1/25

Y1 - 2019/1/25

N2 - 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.

AB - 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.

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KW - Csm

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KW - Nanoindentation

KW - Ordering

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Nanoindentation study of short-range ordering

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