The fine structure f.c.c./b.c.c. boundaries in a Cu-0.3% Cr alloy |
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| Affiliation: | 1. Centre for Materials Science, University of Birmingham, Birmingham B15 2TT, England;2. Department of Metallurgy and Materials Science, Carnegie-Mellon University, Pittsburgh, PA 15213, U.S.A.;1. Department of Materials Engineering, Tarbiat Modares University, Tehran 14115-143, Iran;2. Material Science and Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8626, Japan;3. School of Metallurgy and Materials Engineering, University of Tehran, Tehran 14395-731, Iran;4. Kobelco Research Institute Ltd., Kobe 651-2271, Japan;1. School of Materials Science and Engineering, Tiangong University, Tianjin, 300387, China;2. Institute of Advanced Wear & Corrosion Resistance and Functional Materials, Jinan University, Guangzhou, 510632, China;1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, PR China;2. Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia;3. Department of Physics, National Central University, Jhongli 32001, Taiwan, ROC;4. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China;5. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China;6. Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan, ROC;1. Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;2. Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Kolkata 700 064, India;3. Raja Ramanna Centre for Advanced Technology, Indore 452 013, India;1. Manufacturing Technology Centre, Pilot Way, Ansty Business Park, CV7 9JU Coventry, UK;2. Sandvik Coromant, Unit 8, Morse Way, S60 5BJ Sheffield, UK;3. Powerlase Photonics Ltd, Unit 3 & 4, Meadowbrook Industrial Estate, Crawley RH10 9SA, UK;4. Loughborough University, Loughborough, UK |
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| Abstract: | The interfacial structures of overaged b.c.c. precipitates in a Cu-0.3%Cr alloy have been studied with transmission electron microscopy using weak-beam and lattice imaging techniques and the results have been compared with theoretical structures obtained with the “O”-lattice calculation. Lattice imaging showed that one set of close-packed planes in the structures were accurately parallel and using normal diffraction and Kikuchi line measurements the precipitates were observed to have a range of orientation relationships varying from Nishiyama-Wasserman to Kurdjumov-Sachs and beyond. All precipitates showed at least one fine dislocation array with spacings < 2.5 nm and several examples of arrays with two sets of dislocations were also observed. For three precipitates investigated in detail reasonably good agreement between the theoretical and observed values of the spacings, directions of dislocations and overall habit planes of the interfaces was obtained. Confirmation of the (533)f.c.c. habit plane of the lath precipitate was also obtained. |
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