A kind of tantalum-containing titanium-aluminum base alloy ingot and preparation method thereof

Abstract

The invention provides a tantalum-containing titanium-aluminum base alloy cast ingot which comprises the following components by atomic percent: 45%-48% of Al, 2%-3% of Ta, 1%-2% of Cr, 0.1%-0.25% of W and the balance of Ti and inevitable impurities. Besides, the invention also provides a method for preparing the cast ingot, and the method comprises the following steps of: 1, preparing tantalum powder and titanium powder into a mixed powder material; 2, uniformly mixing the mixed powder material, Al-W interalloy granules and metallic chromium granules, and then wrapping into an alloy packet by using an aluminum foil; 3 uniformly mixing titanium sponge granules and aluminum shots to obtain a mixed granular material; 4, placing the mixed granular material and the alloy packet into a pressing mould according to a certain sequence, and pressing into an alloy block by using an oil press; 5, welding into a smelting electrode; and 6, smelting to obtain the tantalum-containing titanium-aluminum base alloy cast ingot. The tantalum-containing titanium-aluminum base alloy cast ingot provided by the invention has the advantages of uniformity in ingot structure, no pore, impurity or infusible block and excellent antioxygenic property.

Description

technical field [0001] The invention belongs to the technical field of titanium-aluminum-based alloy materials, in particular to a titanium-aluminum-based alloy ingot containing tantalum and a preparation method thereof. Background technique [0002] γ-TiAl based alloy is a new type of metal compound structural material, with high specific strength, specific modulus, creep resistance and excellent high temperature strength, stiffness and low density, etc. A promising high-temperature structural material. With the two obstacles of low room temperature ductility and difficult hot-working formability that hindered its practical application, the problem of insufficient oxidation resistance of γ-TiAl-based alloys when used for a long time above 800 °C becomes more serious. This is due to the inability to form dense Al on the surface of γ-TiAl-based ingot samples 2 O 3 , and the Ti formed between the oxide layer and the substrate 3 Due to the chemical potential of the Al phase...

AI Technical Summary

Problems solved by technology

However, Ta itself is a high-melting element, and the melting point of Al in titanium-aluminum-based alloys is low. Using traditional ingredients and smelting processes to add Ta to titanium-aluminum-based alloys will lead to uncontrollable smelting current and lead to the formation of ingots in alloy ingots. frit, and ultimately difficult to obtain a homogeneous ingot

Therefore, few researchers have added Ta to γ-TiAl-based alloys, and titanium-aluminum-based alloys containing Ta have not been reported.

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