Microstructure of Ni-48 at.%Ti Alloy Prepared from Powder and by Conventional Metallurgy |
| M. Karlíka, b, P. Haušildb, J. Adámekb, J. Drahokoupilc, P. Novákd, L. Perrièree
aCharles University, Faculty of Mathematics and Physics, Department of Physics of Materials, Ke Karlovu 5, 121 16 Prague 2, Czech Republic bCzech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, 120 00 Praha 2, Czech Republic cInstitute of Physics of the CAS, v.v.i., Na Slovance 2, 182 21 Prague, Czech Republic dUniversity of Chemistry and Technology, Prague, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech Republic eInstitut de Chimie et des Matériaux Paris-Est (ICMPE), UMR 7182, CNRS & Université Paris-Est Créteil, 2-8 rue Henri Dunant, 94320 Thiais, France |
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| Microstructure of the samples of the alloy Ni-48 at.%Ti prepared from elemental powders by self-propagating high-temperature synthesis is compared to that of the same alloy cast by conventional vacuum induction melting from bulk metals. Scanning and transmission electron microscopy observations show differences in the phase structure. Besides NiTi matrix, both materials contain also NiTi2, Ni2Ti, Ni3Ti2, Ni3Ti, and Ni4Ti3 phases. Slow furnace cooling after long term annealing at 1000° leads to the transformation of the Ni4Ti3 phase into the Ni8Ti5 phase in the self-propagating high-temperature synthesis material. In the conventionally cast alloy, the Ni8Ti5 phase was not found. |
DOI:10.12693/APhysPolA.134.765 PACS numbers: 81.05.Bx, 81.20.Ev, 87.64.Ee |