The investigation of interaction conditions in intermetallide systems under non-stationary temperature processes

Y. A. Belokon, A. A. Zherebtsov, K. V. Belokon, A. A. Cheylitko

Abstract


Annotation. Purpose. The determination of critical conditions for transition to combustion in intermetallide systems under selfpropagating high-temperature synthesis (SHS) conditions with changeable parameters, which determine process conditions. Methodology. The intermetallide systems Ti-Al and Ni-Al were chosen for the study. As a criterion for a thermal explosion, Semenov's criterion was chosen. The software for engineering and mathematical calculations SciLab was used for numerical calculation. Findings. A numerical analysis of the ratio of the calculated Semenov’s criterion and its critical value showed that the investigated reactions can be divided into two groups. The first group includes systems in which the Semenov’s criterion is below its critical value (Se <Secr). The second group includes systems for which the Semenov’s criterion is equal or exceeds the critical value (Se≥ Secr). Originality. For intermetallide systems Ni-Al and Ti-Al the dependencies of the calculated Semenov’s criterion on the initial synthesis temperature are established. Practical value. It was established that preheating is necessary to carry out the synthesis of titanium aluminide. The calculation showed that to reach the synthesis temperature of the combustion regime in the Ti + Al system it is needed to preheat up to ~ 100 °C (378 K).

Keywords


SHS-reactions; thermal combustion; intermetallides; Ti-Al alloys; Ni-Al alloys; Semenov’s criterion; initial temperature

References


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Pochec E., Józwiak S., Karczewski K and Bojar Z. Fe–Al phase formation around SHS reactions under isothermal conditions. Journal of Alloys and Compounds, 2011, no. 509, pp. 1124-1128. – Режим доступу: http://www.sciencedirect.com/science/article/pii/S0925838810020943

Sereda B., Kruglyak I., Zherebtsov A. and Belokon’ Y. The Modelling of Products Pressing in SHS-Systems. Material Science & Technology, 2009, vol. 1, pp. 827-831.

Sereda B., Kruglyak I., Sheyko S., Zherebtsov A. and Belokon’ Y. The Processes Research of Structurization of Titan Aluminides Received by SHS. Material Science & Technology, 2008, vol. 1, pp. 2069-2073.

Scilab. The official site of software for numerical computation: http://www.scilab.org.


GOST Style Citations


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