A non-destructive technique for the microstructural investigation of nickel base single crystal superalloys: High resolution diffraction of high energy synchrotron radiation
- European Synchrotron Radiation Facility, Grenoble (France)
- Univ. Joseph Fourier Grenoble-CNRS, Saint-Martin-d`Heres (France). Lab. de Spectrometrie Physique
The purpose of the present work is to introduce a technique of investigation based on the diffraction of high energy synchrotron radiation which appears to be very well adapted to the microstructural analysis of single crystal superalloys. In comparison with previous synchrotron measurements made on superalloys, the use of high energy radiation permits to keep the advantage of neutron experiments, measurement on bulk sample in a furnace and a much better resolution (of about one order of magnitude) is reached with a Triple Crystal Diffractometer (TCD) set-up. In particular, the contribution of the mosaicity and of the lattice parameter distribution can be separated and measured in the same experiment. Furthermore the high flux available at the European Synchrotron Radiation Facility (ESRF) reduces the acquisition time and/or allows to analyze a relatively small volume of the sample (few mm{sup 3}). Very small values of the lattice parameter mismatch usually defined as {Delta}d/d = (a{gamma}{prime}-a{gamma})/ where a{gamma}{prime} and a{gamma} are the lattice parameter of the {gamma}{prime} and {gamma} phases respectively, can be measured. Then, as shown in this study, the evolution of the lattice parameters during the first creep stage when the microstructure evolves very fast can be analyzed.
- OSTI ID:
- 474203
- Journal Information:
- Scripta Materialia, Vol. 36, Issue 10; Other Information: PBD: 15 May 1997
- Country of Publication:
- United States
- Language:
- English
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