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

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Khoshhal Razieh; Alavi Nezhad Khalil Abad Seyed Vahid

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Journal Paper

Paper Information

Journal: Journal of Metallurgical and Materials Engineering Year:2023 | Volume:34 | Issue:1 Page(s): 47-58

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Information Journal Paper

Title

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

Author(s)

Khoshhal Razieh | Alavi Nezhad Khalil Abad Seyed Vahid | Issue Writer Certificate

Keywords

Titanium aluminide

Silicon

Intermetallic compounds

Mechanism

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.

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