A high-pressure directional solidification material and method thereof

Abstract

The invention discloses a high-pressure directional solidification material and a method thereof. The preparation method is as follows: heating and melting an aluminum block and a nickel block and mixing them uniformly, cutting and grinding off cut marks after cooling, and obtaining an Al-Ni alloy sample after cleaning and drying; The Al-Ni alloy sample is assembled into an assembly and placed in the pressure chamber of the hydraulic press, and pyrophyllite is filled between the assembly and the inner wall of the pressure chamber, and the pyrophyllite and the assembly together form an assembly block; the assembly block is pressurized to 1~3GPa, at the same time, after the conductive ring is energized, the carbon heating body will heat the Al-Ni alloy sample to 800-1000°C through the conduction of the simple molybdenum; heat preservation and pressure to realize the high-pressure orientation of the Al-Ni alloy sample During the solidification process, a reactant body is obtained; after the reactant body is lowered to normal temperature, the pressure is released to obtain a high-pressure directional solidification material. The invention studies the near-directional solidification process of alloys under GPa level conditions, which is of great significance for exploring and establishing some basic theories in the high-pressure solidification process and expanding the possibility of high-pressure solidification new material preparation methods.

Description

technical field [0001] The invention belongs to the technical field of non-equilibrium solidification, and in particular relates to a high-pressure directional solidification material and a method thereof. Background technique [0002] A casting process in which a temperature gradient in a specific direction is established in the casting shell to make the molten alloy solidify in the direction opposite to the heat flow in accordance with the required crystallographic orientation. The most prominent achievement of directional solidification technology is its application in the aviation industry. A temperature gradient exists in every solidification process. For alloys with a certain solidification range, a mushy region characterized by partial melting will inevitably be produced during cooling. Furthermore, the solidified microstructure (i.e., shape, size, composition) formed in the mushy region largely determines the final organization and properties of the material. More...

AI Technical Summary

Problems solved by technology

[0004] At present, the domestic six-sided high-temperature and high-pressure equipment can manufacture larger-sized samples such as Φ20mm×18mm, but its larger cavity will cause uneven temperature and pressure distribution during the high-pressure solidification process of the sample. Therefore, according to the prepared sample Microstructure is not accurate when establishing high-pressure solidification theory

However, most of the existing solidification theories are based on directional solidification methods. Therefore, it is urgent to provide a technical solution that can reasonably utilize the characteristics of high-pressure solidification pressure and uneven temperature distribution to achieve near-directional solidification under high pressure.

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