Abstract
In this research, Ti-Al powders were produced by electrical explosion of twisted titanium and aluminum wires. The resulting powders were pressed and sintered in a vacuum to obtain bulk composites. Transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), and X-ray diffraction (XRD) studies were performed to analyze synthesized powders and bulk composites. The studies carried out showed the presence of α-Ti, α2-Ti3Al, and γ-TiAl phases, which are formed by coalescence of Ti and Al clusters formed in the process of non-synchronous electrical explosion of twisted wires. Furthermore, an increase in the energy injected into the wires leads to a decrease in the content of micron particles in the powder. During sintering of pressed Ti-Al powder in the range 800–1250 °C, phase transformations occur due to the diffusion of aluminum atoms towards Ti compounds. The research findings can be used to obtain Ti-Al particles and bulk composites with a controllable phase composition.
Highlights
Intermetallic compounds, especially titanium aluminides, are promising materials for many technical applications due to their attractive properties
This paper investigates the synthesis method for the preparation of Ti-Al intermetallide particles by the simultaneous electrical explosion of the twisted titanium and aluminum wires and discusses the mechanism of the formation of Ti-Al particles
According to the data available in the literature, overheating value E/Es is one of the main parameters that determine the properties of the nanoparticles synthesized by the electrical explosion of wire
Summary
Intermetallic compounds, especially titanium aluminides, are promising materials for many technical applications due to their attractive properties. These include hightemperature materials for gas turbines, corrosion-resistant materials, and materials for aerospace and automotive engines [1]. The difference in diffusion coefficients between titanium and aluminum is so great that the Kirkendall effect [5,6] occurs where sintering leads to the formation of pores and cracks in the bulk of the material [7,8]. It is necessary to suppress the formation and growth of the Kirkendall pores, for example by using synthesized Ti-Al particles
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