A method for preparing alloy materials of high niobium-titanium-aluminum by discharging plasma agglomeration

Abstract

This invention discloses a method for preparing high-Nb Ti-Al alloy by discharge plasma sintering. The method comprises: loading element mixed powder alloy powder into a graphite mold, placing in a discharge plasma-sintering furnace, applying an axial pressure of 10-80 MPa, heating at a rate of 50-800 deg.C / min in 10-2-6 Pa vacuum or inert atmosphere, sintering at 900-1400 deg.C, keeping the temperature, and cooling to room temperature to obtain high-Nb Ti-Al alloy blocks. The method can prepare highly compact high-Nb Ti-Al alloy blocks with uniform composition and high performance in a short time and at a low sintering temperature. Besides, the method also has such advantages as low energy consumption, little pollution, easy operation and good repeatability.

Description

technical field

[0001] The invention belongs to the technical field of high-niobium titanium-aluminum intermetallic compound materials, and in particular provides a method for preparing high-niobium titanium-aluminum alloy materials by spark plasma sintering. Background technique

[0002] Because of its low specific gravity, good high-temperature strength, high stiffness and elastic modulus, and good oxidation resistance, creep resistance and fatigue resistance, TiAl-based alloys are widely used in the fields of aviation, aerospace and automobiles. Very competitive high temperature structural material. However, the biggest obstacle to the practical application of TiAl-based alloys is the low plasticity at room temperature, poor formability and insufficient oxidation resistance above 850 °C. In view of the above problems, it is an important content of future work to research and develop high-temperature TiAl alloys with higher temperatures, and to continuously improve and de...

Images