The effect of silicon on the formation of titanium aluminide intermetallic compounds from Al and TiO2

مهندسی متالورژی و مواد

Volume 34, Issue 1 - Serial Number 29, March 2023, Pages 47-58   

Document Type: Original Articles

DOI: 10.22067/jmme.2023.79696.1086

Authors

Razieh Khoshhal^{* 1}; Seyed Vahid Alavi Nezhad Khalil Abad²

¹Department of Materials and Metallurgical Engineering, Birjand University of Technology, Birjand, Iran.

²Department of Civil Engineering, Birjand University of Technology

Abstract

In this article, an attempt was made to investigate the effect of the addition of silicon on the titanium aluminide compound formation from TiO2 and Al raw materials. Silicon has a eutectic with aluminum and can reduce its melting temperature, which can have effective impact on the formation of titanium aluminide compounds. On the other hand, due to the production of Ti5Si3 compound, it can be effective in increasing the oxidation resistance of compounds and composites containing titanium aluminide. With this aim in mind, the present paper has strove to determine the impact of this element on the formation of titanium aluminides and the type of titanium silicide phases by adding different amounts of silicon to TiO2 and Al raw materials. The key findings emerged, showed that when silicon is added to the system in small amounts (0.1), it not only does not have a positive effect on the reactions, it also prevents the formation of titanium aluminide compounds, but with an increase in its percentage (0.28), it also causes the formation of these titanium aluminide compounds and leads to the formation of Ti5Si3 phase. This phase changes from a discrete morphology to a continuous state as the percentage of silicon increases (0.6). With a further increase in the amount of silicon (1), the TiSi2 phase is formed, which is dispersed throughout the sample with a string-like structure.

Keywords

Titanium aluminide; Silicon; Intermetallic compounds; Mechanism

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