Preparing method for synthesizing and fusion casting of high-entropy alloy through self-propagating combustion

Abstract

The invention discloses a preparing method for synthesizing and fusion casting of a high-entropy alloy through self-propagating combustion. The method comprises the following steps that firstly, aluminum powder, iron oxide, cobalt oxide, nickel protoxide, chromic oxide and manganese oxide serve as raw materials, meanwhile, aluminum oxide is added to serve as a reaction dilution agent, and a prefabricated block with the corresponding density is obtained; secondly, a graphite crucible and a graphite cast mold are assembled, casting gypsum is poured, and after being subjected to vacuum pumping and air removal, a gypsum mold is placed in a muffle furnace, and mold baking is conducted; thirdly, the prefabricated block obtained in the first step is placed in the gypsum mold obtained in the second step, a heating coil is placed on the surface of the prefabricated block, so that the surface of the prefabricated block is rapidly heated, the prefabricated block is ignited, and high-entropy alloy liquid is obtained in the combustion heat releasing process; and fourthly, vacuum pumping is conducted on the bottom of the gypsum mold, the alloy liquid is cooled in the graphite cast mold, and the high-entropy alloy is obtained. According to the method, needed raw materials are cheap, the equipment and the technology are simple, the process can be conducted at the normal pressure, protective atmosphere is not needed, a high-entropy alloy interphase boundary is clean, and the structure is fine.

Description

technical field [0001] The invention relates to a technology for preparing high-entropy alloys by self-propagating combustion synthesis and casting, and belongs to the technical field of preparation of high-entropy alloys. Background technique [0002] High-entropy alloys are one of the important fields of research in the field of structural materials in recent years. They break through the alloy design principles of conventional structural materials (such as steel, aluminum alloys, superalloys, etc.) with a single element as the main element. The elements are obtained in a single-phase solid solution or a dual-phase alloy matrix with a close atomic ratio. At present, the preparation methods of high-entropy alloys mainly include vacuum arc melting combined with suction or pour casting, mechanical alloying combined with hot pressing sintering and magnetron sputtering deposition, among which vacuum arc melting and mechanical alloying are the mainstream methods. The multi-prin...

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Problems solved by technology

[0003] These preparation methods all require the use of high-purity raw materials, and complex process control devices are required in the preparation process, resulting in high preparation costs of high-entropy alloys, and it is difficult to form parts with complex shapes

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