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High-entropy alloy for brazing of TiAl and nickel-based high-temperature alloy and preparation method

A nickel-based superalloy and high-entropy alloy technology, which is applied in welding equipment, metal processing equipment, welding medium and other directions, can solve the problems of high melting point of solder, erosion of base metal, and high melting point, and achieves simple and easy-to-control process. The effect of reducing production cost and improving heat resistance

Active Publication Date: 2021-01-15
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main elements in the base metal, such as Cr, Ti, Ni, Co, and Fe, have high melting points, which may lead to a high melting point of the solder, which in turn increases the brazing temperature.
High welding temperature will damage the properties of the base metal, or cause excessive corrosion of the base metal during the welding process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The steps of preparing the high-entropy alloy method for brazing TiAl and nickel-based superalloys according to the present invention are as follows:

[0024] Step 1, the atomic percentages of Al: 25%, Cu: 12.5%, Co: 12.5%, Fe: 12.5%, Cr: 12.5%, Ni: 12.5%, and Ti: 12.5% ​​of the high-entropy alloy solder are converted into mass percentages , Weigh the elemental aluminum, copper, cobalt, iron, chromium, nickel and titanium according to the mass percentage, and get the raw materials after mixing

[0025] Step 2: Put the prepared raw materials above into the crucible, and use the vacuum arc melting method for melting, repeat the melting 4 times, and obtain the high-entropy alloy brazing filler metal ingot.

[0026] Step 3, using the vacuum quenching and rapid solidification technology, the above-mentioned brazing material ingot is prepared into a high-entropy alloy amorphous foil strip, and the TiAl alloy and the nickel-based superalloy are brazed under vacuum conditions. ...

Embodiment 2

[0028] The difference between this embodiment and the first embodiment is that in step one, the atomic percentages of the high-entropy alloy solder are Al: 25%, Cu: 12.5%, Co: 19%, Fe: 12.5%, Cr: 19%, Ni : 6%, Ti: 6%; in step 2, the smelting method used is arc smelting under an argon protective atmosphere. Others are the same as in Embodiment 1.

Embodiment 3

[0030] The difference between this embodiment and Example 1 is that in step 1, elemental Al can be added in the form of Al-10Ti (wt.%) master alloy, that is, according to the amount of required elemental Al, the required Al-10Ti ( wt.%) of the master alloy, and calculate the amount of elemental Ti that needs to be added, and then weigh and obtain the proportioned raw materials respectively; in step 2, the smelting method used is vacuum induction smelting. Others are the same as in Embodiment 1.

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Abstract

The invention discloses a high-entropy alloy for brazing of TiAl and nickel-based high-temperature alloy and a preparation method. The high-entropy alloy comprises the following chemical components inatomic percent: 15-25% of Al, 10-20% of Cu, 10-20% of Co, 10-20% of Fe, 10-20% of Cr, 5-15% of Ni and 5-15% of Ti. The preparation method comprises the following steps: weighing raw materials required by smelting according to the components of 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 for brazing TiAl and a nickel-based superalloy and a preparation method thereof, belonging to the field of welding technology. The high-entropy alloy is used for the brazing connection of two extremely different materials, a TiAl alloy and a 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/286B23K35/40
Inventor 任海水李文文熊华平邹文江冯洪亮
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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