Gamma-based high-temperature TiAl composite material coaxial powder feeding 3D printing preparation method
A composite material and 3D printing technology, applied in the direction of additive manufacturing, additive processing, etc., can solve the problems of high temperature creep performance decline, tissue degradation, high energy consumption, etc., to improve high temperature performance, inhibit grain growth, Ensuring reproducible results
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[0042] The preparation method of this embodiment uses Si 3 N 4 For the silicon source and nitrogen source, the total amount of 200g of Ti-55Al-7.5Nb pre-alloyed powder and the corresponding proportion of Si 3 N 4 (The atomic ratio of N element is 1%) The mixed powder is placed in the ball milling tank of the ball mill, filled with argon gas for protection, and the mixed powder is obtained by mechanical ball milling at a low temperature (5°C) for 480 min under the condition that the rotational speed of the ball mill is 180 r / min. Then, it was kept in a vacuum drying oven (200 °C) for 24 h, and a new type of γ-based high Nb-TiAl composite was obtained by laser 3D printing.
[0043] figure 1 It is the phase diagram of the Ti-Al binary alloy used in this embodiment. It can be seen that there are two solidification paths in the figure. Path 1 is the atomic ratio of the TiAl alloy in the traditional way. Phase structure, and route 2 is the alloy composition ratio used in this ex...
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