Deformation mechanisms in Ni-based superalloys at room and elevated temperatures studied by in Situ neutron diffraction and electron microscopy

Kümmel F, Kirchmayer A, Solís C, Hofmann M, Neumeier S, Gilles R (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Metals MDPI

Book Volume: 11

Article Number: 719

Journal Issue: 5

DOI: 10.3390/met11050719

Abstract

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® 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 perpen-dicular to the loading direction. Accordingly, a remaining lattice strain and high dislocation density were detected predominantly in these grains.

Authors with CRIS profile

Andreas Kirchmayer Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Involved external institutions

Technische Universität München (TUM) DE Germany (DE)

How to cite

APA:

Kümmel, F., Kirchmayer, A., Solís, C., Hofmann, M., Neumeier, S., & Gilles, R. (2021). Deformation mechanisms in Ni-based superalloys at room and elevated temperatures studied by in Situ neutron diffraction and electron microscopy. Metals, 11(5). https://doi.org/10.3390/met11050719

MLA:

Kümmel, Frank, et al. "Deformation mechanisms in Ni-based superalloys at room and elevated temperatures studied by in Situ neutron diffraction and electron microscopy." Metals 11.5 (2021).

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