Abstract
The evolution of the γ/γ′ lattice mismatch of the AM1 single-crystal superalloy was measured during in situ non-isothermal very high-temperature creep tests under X-ray synchrotron radiation. The magnitude of the effective lattice mismatch in the 1273 K to 1323 K (1000 °C to 1050 °C) temperature range always increased after overheatings performed at temperatures lower than 1403 K (1130 °C). In contrast, a decrease of its magnitude was observed after overheatings at temperatures greater than 1453 K (1180 °C) due to massive dislocation recovery processes occurring at very high temperature.
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The authors thank Dr. Zéline Hervier and Dr. Arnaud Longuet (Turbomeca and Snecma - SAFRAN group) for their interest in this study, DGA (Direction Générale de l’Armement) for its financial support, and Martin Von Zimmerman for his help on the BW5 beamline. Dr. Patrick Villechaise and Florence Hamon (Institut P’, ENSMA, UPR CNRS 3346) are acknowledged for their advices in specimens preparation. The E.U. is also gratefully acknowledged for its financial support through the initiative “ELISA: EU Support of Access to Synchrotrons/FELs in Europe.”
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Manuscript submitted February 16, 2012.
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Le Graverend, JB., Dirand, L., Jacques, A. et al. In Situ Measurement of the γ/γ′ Lattice Mismatch Evolution of a Nickel-Based Single-Crystal Superalloy During Non-isothermal Very High-Temperature Creep Experiments. Metall Mater Trans A 43, 3946–3951 (2012). https://doi.org/10.1007/s11661-012-1343-x
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DOI: https://doi.org/10.1007/s11661-012-1343-x