Deformation Mechanisms in Ni-Based Superalloys at Room and Elevated Temperatures Studied by In Situ Neutron Diffraction and Electron Microscopy
Polycrystalline Ni-based superalloys are one of the most frequently used materials for high temperature load-bearing applications due to their superior mechanical strength and chemical resistance. In this paper, we presented an in situ diffraction study on the tensile deformation behavior of the pol...
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MDPI AG
2021-04-01
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| author | Frank Kümmel Andreas Kirchmayer Cecilia Solís Michael Hofmann Steffen Neumeier Ralph Gilles |
| author_facet | Frank Kümmel Andreas Kirchmayer Cecilia Solís Michael Hofmann Steffen Neumeier Ralph Gilles |
| author_sort | Frank Kümmel |
| collection | DOAJ |
| description | Polycrystalline Ni-based superalloys are one of the most frequently used materials for high temperature load-bearing applications due to their superior mechanical strength and chemical resistance. In this paper, we presented an in situ diffraction study on the tensile deformation behavior of the polycrystalline Ni-based superalloy VDM<sup>®</sup> Alloy 780 at temperatures up to 500 °C performed at the STRESS-SPEC neutron diffractometer at the Heinz Maier-Leibnitz Zentrum. A detailed microstructural investigation was carried out by electron microscopy before and after testing. The results of these studies allowed us to determine the deformation mechanism in the differently orientated grains. It is shown that the deformation behavior, which is mainly dislocation motion and shearing of the γ′-precipitates, does not change at this temperature range. The deformation is strongly anisotropic and depends on the grain orientation. The macroscopic hardening can mainly be attributed to plastic deformation in grains, where the (200) lattice planes were orientated perpendicular to the loading direction. Accordingly, a remaining lattice strain and high dislocation density were detected predominantly in these grains. |
| first_indexed | 2024-03-10T11:53:44Z |
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| language | English |
| last_indexed | 2024-03-10T11:53:44Z |
| publishDate | 2021-04-01 |
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| spelling | doaj.art-116f39f72c5b4508b2e73eb120e308162023-11-21T17:27:51ZengMDPI AGMetals2075-47012021-04-0111571910.3390/met11050719Deformation Mechanisms in Ni-Based Superalloys at Room and Elevated Temperatures Studied by In Situ Neutron Diffraction and Electron MicroscopyFrank Kümmel0Andreas Kirchmayer1Cecilia Solís2Michael Hofmann3Steffen Neumeier4Ralph Gilles5Heinz Maier-Leibnitz Zentrum (MLZ), TU München, Lichtenbergstr. 1, 85748 Garching, GermanyDepartment of Materials Science & Engineering, Institute I: General Materials Properties, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Martensstr. 5, 91058 Erlangen, GermanyHeinz Maier-Leibnitz Zentrum (MLZ), TU München, Lichtenbergstr. 1, 85748 Garching, GermanyHeinz Maier-Leibnitz Zentrum (MLZ), TU München, Lichtenbergstr. 1, 85748 Garching, GermanyDepartment of Materials Science & Engineering, Institute I: General Materials Properties, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Martensstr. 5, 91058 Erlangen, GermanyHeinz Maier-Leibnitz Zentrum (MLZ), TU München, Lichtenbergstr. 1, 85748 Garching, GermanyPolycrystalline Ni-based superalloys are one of the most frequently used materials for high temperature load-bearing applications due to their superior mechanical strength and chemical resistance. In this paper, we presented an in situ diffraction study on the tensile deformation behavior of the polycrystalline Ni-based superalloy VDM<sup>®</sup> Alloy 780 at temperatures up to 500 °C performed at the STRESS-SPEC neutron diffractometer at the Heinz Maier-Leibnitz Zentrum. A detailed microstructural investigation was carried out by electron microscopy before and after testing. The results of these studies allowed us to determine the deformation mechanism in the differently orientated grains. It is shown that the deformation behavior, which is mainly dislocation motion and shearing of the γ′-precipitates, does not change at this temperature range. The deformation is strongly anisotropic and depends on the grain orientation. The macroscopic hardening can mainly be attributed to plastic deformation in grains, where the (200) lattice planes were orientated perpendicular to the loading direction. Accordingly, a remaining lattice strain and high dislocation density were detected predominantly in these grains.https://www.mdpi.com/2075-4701/11/5/719Ni-based superalloydeformation behaviorneutron diffractionlattice strainmicrostructural investigationtransmission electron microscopy |
| spellingShingle | Frank Kümmel Andreas Kirchmayer Cecilia Solís Michael Hofmann Steffen Neumeier Ralph Gilles Deformation Mechanisms in Ni-Based Superalloys at Room and Elevated Temperatures Studied by In Situ Neutron Diffraction and Electron Microscopy Metals Ni-based superalloy deformation behavior neutron diffraction lattice strain microstructural investigation transmission electron microscopy |
| title | Deformation Mechanisms in Ni-Based Superalloys at Room and Elevated Temperatures Studied by In Situ Neutron Diffraction and Electron Microscopy |
| title_full | Deformation Mechanisms in Ni-Based Superalloys at Room and Elevated Temperatures Studied by In Situ Neutron Diffraction and Electron Microscopy |
| title_fullStr | Deformation Mechanisms in Ni-Based Superalloys at Room and Elevated Temperatures Studied by In Situ Neutron Diffraction and Electron Microscopy |
| title_full_unstemmed | Deformation Mechanisms in Ni-Based Superalloys at Room and Elevated Temperatures Studied by In Situ Neutron Diffraction and Electron Microscopy |
| title_short | Deformation Mechanisms in Ni-Based Superalloys at Room and Elevated Temperatures Studied by In Situ Neutron Diffraction and Electron Microscopy |
| title_sort | deformation mechanisms in ni based superalloys at room and elevated temperatures studied by in situ neutron diffraction and electron microscopy |
| topic | Ni-based superalloy deformation behavior neutron diffraction lattice strain microstructural investigation transmission electron microscopy |
| url | https://www.mdpi.com/2075-4701/11/5/719 |
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