Combustion of vanadium-iron alloys in nitrogen

Maksimov, Yu. M.; Зиатдинов, М. Х.; Мержанов, А. Г.; Raskolenko, L. G.; Лепакова, O. K.

doi:10.1007/bf00782233

Cited by 6 publications

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“…As shown in studies of the mechanism of phase formation during self-propagating high-temperature synthesis (SHS) in a combustion wave in metal-metalnitrogen systems (Ti-Ni-N, Ti-Co-N, Ti-Fe-N, and Al-W-N) [1][2][3], the conditions in the reaction zone of combustion waves are favorable for the formation of nonequilibrium phases, such as metal nitrides missing in equilibrium phase diagrams. The formation of such compounds is favored by the following factors: chemical reactions in a combustion wave occur at high temperatures, due to the heat of reactions of Ti and Al with nitrogen; the reactions occur in high-temperature solutions [4]; moreover, metals react with active nitrogen atoms resulting from the decomposition of intermediate nitrides [5], such as tungsten nitrides.…”

Section: Introductionmentioning

confidence: 99%

10.1007/s10789-008-1005-y

2000

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X-ray diffraction data are presented for combustion products in the Al-W-N system. New, nonequilibrium intermetallic compounds have been identified, their diffraction patterns have been indexed, and their unit-cell parameters have been determined. The phases α -and β -WAl 4 are shown to exist in three isomorphous forms, differing in unit-cell centering. The phases α '-, α ''-, and α '''-WAl 4 are monoclinic, with a 0 = 5.272 Å, b 0 = 17.770 Å, c 0 = 5.218 Å , β = 100.10° ; point groups C 12/ c 1, A 12/ n 1, I 12/ a 1 , respectively. The phases β '-, β ''-, and β '''-WAl 4 are monoclinic, with a 0 = 5.465 Å , b 0 = 12.814 Å , c 0 = 5.428 Å , β = 105.92° ; point groups A 112/ m , B 112/ m , I 112/ m , respectively. The compounds WAl 2 and W 3 Al 7 , identified each in two isomorphous forms, differ in cell metrics (doubling) but possess the same point group: P 222. : orthorhombic, a 0 = 5.793 Å , b 0 = 3.740 Å , c 0 = 6.852 Å. : orthorhombic, a 0 = 11.586 Å , b 0 = 3.740 Å , c 0 = 6.852 Å. W 3 : orthorhombic, Pmm 2, a 0 = 6.225 Å , b 0 = 4.806 Å , c 0 = 4.437 Å. W 3 : orthorhombic, Pmm 2, a 0 = 12.500 Å , b 0 = 4.806 Å , c 0 = 8.874 Å. The new phase WAl 3 : triclinic, P 1, a 0 = 8.642 Å , b 0 = 10.872 Å , c 0 = 5.478 Å , α = 104.02°, β = 64.90°, γ = 107.15° .

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Section: Introductionmentioning

confidence: 99%