• Chekalkin, Timofey
• Marchenko, Ekaterina
• Obrosov, Aleksei
• Baigonakova, Gulsharat
• Dubovikov, Kirill
• Gunther, Sergey
• Yasenchuk, Yuri
• Weiss, Sabine
• Gunther, Victor

Abstract

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 Ti<SUB>4</SUB>Ni<SUB>2</SUB>(O, N, C) with nonmetallic inclusions of different structural variants and routes of origin. Fine-porous alloys were synthesized at ignition temperatures of 450 °C-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 NiSi<SUB>2</SUB>, NaAlSiO (SO<SUB>4</SUB>), SiO<SUB>2</SUB>, MgSi<SUB>2</SUB>, and CaCO<SUB>3</SUB>. Conversely, large-pore alloys ignited at temperatures of 280 °C-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 CaTiO<SUB>3</SUB>, Si (P<SUB>2</SUB>O<SUB>7</SUB>), CaSiO<SUB>3</SUB>, MgAl<SUB>2</SUB>O<SUB>4</SUB>, TiNiAl, as well as the Ti<SUB>3</SUB>SiC<SUB>2</SUB>MAX phase....

Topics

• porous
• pore
• surface
• amorphous
• inclusion
• crystalline phase
• glass
• glass
• intermetallic
• crystallinity