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Structural-phase surface composition of porous TiNi produced by SHS

  • The study aimed to characterize the structural-phase composition of the porous SHS TiNi surface explored by the GIXRD method. The surface layers at a depth of up to 100 nm mainly consist of amorphous nanocrystalline intermetallic oxycarbonitrides Ti₄Ni₂(O,N,C) with nonmetallic inclusions of different structural variants and routes of origin. Fine-porous alloys were synthesized at ignition temperatures of 450-480 °C. A distinct feature of the surface of crystalline phases therein was shown to be a low degree of crystallinity (up to 40%) and presence of multifarious glass and cermet phases evident as NiSi₂, NaAlSiO (SO₄), SiO₂, MgSi₂, and CaCO₃. Conversely, large-pore alloys ignited at temperatures of 280-330 °C have a higher degree of crystallinity (up to 70%). An individually selected GIXRD technique and precision structural phase analysis are capable to determine a set of other superficial nonmetallic and cermet phases reported as CaTiO₃, Si (P2O₇), CaSiO₃, MgAl₂O₄, TiNiAl, as well as the Ti₃SiC₂MAX phase.

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Author: Ekaterina Marchenko, Yuri Yasenchuk, Sergey Gunther, Gulsharat Baigonakova, Victor Gunther, Timofey ChekalkinORCiD, Sabine WeißORCiDGND, Aleksei ObrosovORCiD, Kirill Dubovikov
URL:https://iopscience.iop.org/article/10.1088/2053-1591/ab4e32/pdf
DOI:https://doi.org/10.1088/2053-1591/ab4e32
ISSN:2053-1591
Title of the source (English):Materials Research Express
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2019
Volume/Year:6
Issue number:11
Number of pages:12
Article number:1165b1
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Metallkunde und Werkstofftechnik
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