High-entropy alloy brazing filler metal and preparation method thereof

Abstract

The invention discloses high-entropy alloy brazing filler metal and a preparation method thereof. The high-entropy alloy brazing filler metal comprises the following chemical components in atomic percent: 10-20% of Al, 10-20% of Cu, 10-20% of Co, 10-20% of Fe, 10-20% of Ni, 10-20% of Cr, 4-12% of Si and 4-12% of B. The preparation method comprises the following steps: weighing raw materials required for smelting according to the components of the brazing filler metal; smelting the raw materials to obtain a high-entropy alloy brazing filler metal ingot; and preparing a high-entropy alloy amorphous foil belt by utilizing a vacuum quenching rapid solidification technology, or preparing high-entropy alloy brazing filler metal powder by adopting a vacuum gas atomization technology. The high-entropy alloy brazing filler metal has very high mixed entropy, the structure of the high-entropy alloy brazing filler metal is mainly a solid solution structure, the high-entropy alloy brazing filler metal can be used for brazing connection between two extremely different materials, namely TiAl alloy and nickel-based high-temperature alloy, and can keep good compatibility with the two welded base materials simultaneously, and high connection strength is obtained.

Description

technical field

[0001] The invention relates to a high-entropy alloy solder and a preparation method thereof, belonging to the technical field of welding. The high-entropy alloy solder is used for brazing connection of two extremely different materials, TiAl alloy and nickel-based superalloy. Background technique

[0002] TiAl alloy has low density, high specific strength, good high temperature oxidation resistance, and creep resistance. It is a very promising lightweight and high temperature resistant structural material. Substitute materials for titanium alloys and high-temperature alloys have good application prospects in aviation, aerospace, nuclear industry, weapons, automobiles and other fields.

[0003] For TiAl alloy, in order to expand its engineering application range, welding technology will be very important, especially the connection between TiAl alloy and other metals. For example, in the field of aviation, the metal thermal protection structure of hypersonic ...