Alloying Elements and Misfit Influence on the Tensile Behavior of Different Generation Ni-Based Single Crystal Superalloys

Bandorf J, Mansoz B, Neumeier S, Caron P, Ormastroni LMB, Kawagishi K, Cormier J, Pettinari-Sturmel F (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science ASM International

DOI: 10.1007/s11661-025-08066-y

Abstract

Nickel-based single-crystal (SX) superalloys are key materials for high-pressure turbine blades due to their exceptional mechanical strength and environmental resistance at elevated temperatures. While their high-temperature creep behavior has been extensively studied, their tensile response in the lower temperature range remains less well understood. This study investigates the influence of alloy chemical composition and γ/γ′ lattice misfit on the tensile behavior of 14 SX superalloys from different generations, tested at 650 °C. The lattice misfit was measured using high-resolution X-ray diffraction (HRXRD) for the first time in 14 different Ni-based superalloys, the microstructure and the deformation mechanism were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. A relationship is established between alloying elements, misfit, microstructural parameters (γ′ precipitate size, γ-channel width, dislocations characteristics), and tensile performance. In particular, alloys exhibiting large negative misfit values, such as TMS-238, show homogeneous deformation with high dislocation density and pronounced stacking faults in the γ channels, leading to strong work hardening and reduced ductility. However, TMS-238 shows a low yield strength probably due to the high coherency stresses. In contrast, alloys with moderate misfit display more localized deformation mechanisms. An approach is presented that takes into account the contribution of the coherency stresses to the yield behavior. A higher magnitude of coherency stresses induces early plastic deformation in general leading to lower yield strength. These findings highlight the critical role of the lattice misfit and the associated coherency stresses in designing components made of SX superalloys for advanced turbine applications.

Authors with CRIS profile

Jakob Bandorf Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Involved external institutions

Université Fédérale de Toulouse Midi-Pyrénées FR France (FR) Office National d'Etudes et de Recherches Aérospatiales (ONERA) / The French Aerospace Lab FR France (FR) Ecole Nationale Supérieure de Mécanique et d´Aérotechnique (ISAE-ENSMA) FR France (FR) National Institute of Materials Science (NIMS) JP Japan (JP)

How to cite

APA:

Bandorf, J., Mansoz, B., Neumeier, S., Caron, P., Ormastroni, L.M.B., Kawagishi, K.,... Pettinari-Sturmel, F. (2026). Alloying Elements and Misfit Influence on the Tensile Behavior of Different Generation Ni-Based Single Crystal Superalloys. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science. https://doi.org/10.1007/s11661-025-08066-y

MLA:

Bandorf, Jakob, et al. "Alloying Elements and Misfit Influence on the Tensile Behavior of Different Generation Ni-Based Single Crystal Superalloys." Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science (2026).

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