Determination of dispersoid size distributions in Inconel MA 754 by small-angle X-ray scattering |
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| Affiliation: | 1. Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, U.S.A.;2. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.;1. IMDEA Materials Institute, 28906, Getafe, Madrid, Spain;2. National Institute of Technology, Warangal, India;3. Dpt. of Materials Science and Engineering, Universidad Carlos III de Madrid, IAAB, 28911, Leganés, Madrid, Spain;1. Institute of Biotechnology, National Tsing-Hua University, Hsinchu, Taiwan, ROC;2. Department of Urology, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan, ROC;1. School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. Quantum Beam Unit, National Institute for Materials Science, Sengen 1-2-1, Tsukuba 305-0047, Japan;2. Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, Warsaw 02-507, Poland |
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| Abstract: | The dispersoid size frequency distribution and volume fraction of the nickel based oxide dispersion strengthened alloy Inconel MA 754 have been determined using small-angle X-ray scattering (SAXS). Two methods of determining dispersoid size distributions from the SAXS spectra are utilized. One method involves a calculation of log-normal distribution parameters from the integrated intensity, forward scattering and the Porod radius. A second method employs an integral transform of the data to calculate the size distribution. Dispersoid size distributions from the transform method exhibit close agreement with histograms obtained from thin foil transmission electron microscopy. Measurement of dispersoid volume fractions from the integrated intensity, coupled with dispersoid size frequency distributions allow a calculation of the average planar separation distance of the dispersoids. The results for two heats of MA 754 lead to predicted dislocation creep strengths which are in reasonable agreement with short time creep data at 1000 and 1093°C. The effect of the presence of mixed aluminum-yttrium oxides in MA 754 is considered. |
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