In Situ Measurement of the gamma/gamma' Lattice Mismatch Evolution of a Nickel-Based Single-Crystal Superalloy During Non-isothermal Very High-Temperature Creep Experiments
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The evolution of the / lattice mismatch of the AM1 single-crystal superalloy was measured during in situ nonisothermal 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. 2012 The Minerals, Metals & Materials Society and ASM International.