Abstract
Synchrotron X-ray diffraction analysis of a nickel superalloy subjected to barothermal treatment (BTT) at 1235, 1260, and 1320°C is performed using a high-power synchrotron radiation source. The alloy is found to contain two types of γ′ phase and two types of γ solid solution, which are likely to be located in dendrite arms and the interdendritic space, respectively. The averaged lattice misfits of the γ′ phases and the γ solid solutions change with the BTT temperature at a constant pressure and exposure time, which substantially affects the high-temperature characteristics of the alloy.
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