THE EFFECT OF NON-EQUILIBRIUM CRYSTALLIZATION ON AL–MO–TI ALLOY PHASE COMPOSITION

N. I. Selmenskikh; V. M. Chumarev; S. V. Zhidovinova; A. A. Pankratov; R. I. Gulyaeva; A. N. Rylov

doi:10.17073/0021-3438-2014-1-59-64

THE EFFECT OF NON-EQUILIBRIUM CRYSTALLIZATION ON AL–MO–TI ALLOY PHASE COMPOSITION

N. I. Selmenskikh, V. M. Chumarev, S. V. Zhidovinova, A. A. Pankratov, R. I. Gulyaeva, A. N. Rylov

https://doi.org/10.17073/0021-3438-2014-1-59-64

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Abstract

Using X-ray phase analysis, X-ray spectral analysis and microscopy, phase composition, micro- and crystalline structure of AMT alloy (TU-48-4-366), which is applied as alloying material in melting of titanium alloys, have been investigated. The lattice parameters of ε, p, δ-phases are calculated and their element compositions are determined. The formation of Mo3Al refractory phase (tm = 2150 °C) is not observed during primary crystallization in non-equilibrium conditions of Al-Mo-Ti alloy. Its presence in the foundry alloy is caused by the secondary recrystallization processes in the course of which ultrafine mixture of Mo3Al + Mo3Al8 + TiMoAl6 phases is formed at temperatures of 1311 °C and 1314 °C. Ultrafine silicon-containing σ-phase of average Mo2,4Ti2,1Si0,8Al4,7 composition produced in the non-equilibrium conditions of crystallization is found. The parameters and interplanar spacing of its lattice are defined. It is found that the greatest inhomogeneity in molybdenum in the peritectic of primary crystals occurs at high speed of crystallization, i.e. in the lower part of Al-Mo-Ti ingot.