Nanoquasicrystalline Phase in Mechanically Alloyed and Heat-Treated Al73Cu11Cr16

T.A. Sviridovaa, A.P. Shevchukova, E.V. Shelekhova, D.L. Diakonovb, M.V. Gorshenkovc, S.D. Kaloshkina, V.V. Tcherdyntseva, Z. Lid and G. Fand aCenter for Composite Materials, National University of Science and Technology "MISIS", Moscow 119049, Russia bBardin Central Research Institute for the Iron and Steel Industry, Moscow 105005, Russia cInt. School of Microscopy, National University of Science and Technology "MISIS", Moscow 119049, Russia dState Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China

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X-ray diffraction analysis, scanning and transmission electron microscopy, thermal analysis and measurement of chemical composition were implemented to determine structure, thermal stability and chemical composition of the decagonal quasicrystal in Al73Cu11Cr16 alloy produced by long-term mechanical alloying of elemental powders followed by annealing at 700°C. According to the TEM investigation such a technique permits to produce a single-phase nanostructural quasicrystal with grain size about 60 nm. Differential thermal analysis revealed that the decagonal phase does not exist above 923°C and undergoes incongruent two-stage melting coming to the end at 1100°C.

DOI: 10.12693/APhysPolA.126.599 PACS numbers: 61.44.Br, 64.70.kd, 61.05.cp, 61.05.J-