Granularity-induced plastic deformation mechanism of pure polycrystalline cubic boron nitride |
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| Affiliation: | 1. Institute of Production Engineering and Machine Tools, An der Universität 2, 30823, Garbsen, Germany;2. BDW-BINKA Diamantwerkzeug GmbH, Im Seefeld 5-7, 31552, Rodenberg, Germany;1. Institute for Superhard Materials of the National Academy of Sciences of Ukraine, 2, Avtozavodskaya Str., Kiev 07074, Ukraine;2. Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria;3. Institut für Photonische Technologien, Albert-Einstein-Strasse 9, Jena D-07745, Germany;4. Institute for Problems in Material Science of the National Academy of Sciences of Ukraine, 3, Krzhizhanovsky Str., Kiev 03680, Ukraine;5. Laboratoire National des Champs Magnétiques Intenses (LNCMI/CNRS), 25 Avenue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France;6. Karlsruhe Institute of Technology (KIT), 76344 Eggenstein, Germany;7. Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105, Israel;8. CNRS/CRISMAT/ISMRA, 6, Bd du Maréchal Juin, CNRS UMR 6508, 14050 Caen, France |
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| Abstract: | Combined X-ray diffraction(XRD) profile analysis and HRTEM observation, a method for exploration of plastic deformation in pure polycrystalline cubic boron nitride (PcBN) samples with sizes of primary cBN powders was developed. XRD profile results showed that the coarse-grained PcBN exhibited a larger micro-strain ε, a greater deformation stacking faults probability fD, which was an order of magnitude larger than that of fine-grained PcBN, but a smaller twin stacking faults probability fT. It was deduced that the plastic deformation of the coarse-grained PcBN was dominated by stacking faults and mechanical twins mode, which would result in strain strengthening and then recrystallization. While the manner of growth twins was the mainly modes of fine-grained PcBN by phase transform, especially utilized the curled SP2 structure as a basis for a cubic structure nucleation. Fundamental plastic deformation principles of the ultrafine polycrystalline cBN was crucial for the field of high-precision cutting tools. |
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| Keywords: | Pure PcBN X-ray diffraction profile analysis HRTEM Plastic deformation Granularity |
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