The effects of third elements on the kinetics of order change in Ni3Al under H.V.E.M. irradiation |
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| Institution: | 1. Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Science and Engineering, Kyushu University, Kasuga 816-8580, Japan;2. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium;3. Department of Engineering Science for Electronics and Materials, Faculty of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan;1. State Key Laboratory of Environmental Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, Sichuan 621010, PR China;2. Key Laboratory of Ecological Environment Evolution and Pollution Control in Mountainous and Rural Areas of Yunnan Province, Yunnan 650000, PR China;3. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, PR China;4. Sichuan Radiation Detection & Protection Institute of Nuclear Industry, Chengdu 610052, PR China;5. University of Science and Technology of China, Hefei, Anhui 230026, PR China;6. Plasma Institute of the Chinese Academy of Sciences, Hefei, Anhui 230026, PR China |
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| Abstract: | The effects of boron, cobalt or titanium additions on the kinetics of order changes in Ni3Al under irradiation were investigated in a HVEM. The long-range order (LRO) parameter was determined by measuring the intensities of superlattice spots on the diffraction patterns. Order-variation kinetics was investigated by using a previously proposed theoretical model. The number of replacements per displacement ɛ and the steady-state LRO parameter S∞ were directly deduced by fitting a kinetic law to experimental data ; a good agreement was generally found. A weak effects of the above third elements on the disordering efficiency was observed whereas the effect of stoichiometry appeared to be more important. Reordering was found to be controlled by long-range vacancy migration with a migration enthalpy of 0.9 to 1.0 eV ; this was deduced from a comparison between the experimental temperature dependence of the steady — state LRO parameter with calculated curves. The effects of third elements on the reordering kinetics is clearly revealed : compared to binary alloys, a decrease of the effective reordering rate is generally observed. |
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