Method adopting cryogenic rollers to prepare gradient structure material

Abstract

The invention discloses a method adopting cryogenic rollers to prepare a gradient structure material. The method comprises the following steps that an alloy plate is placed into a heating furnace, theheating temperature is (0.7-0.9) Tm, and Tm is the melting point of an alloy plate material; a cryogenic treating device is opened, and the temperature of working rollers of a continuous rolling unitis reduced to -150 DEG C - -100 DEG C; and the alloy plate is taken out of the heating furnace and fed into the continuous rolling unit for continuous rolling, the reduction rate of a rolled piece ineach pass after the roller piece passes through the rollers is 1-5%, the total reduction rate of the rolled piece is 30-50%, and a gradient structure plate is obtained, wherein the alloy plate of themethod can be an aluminum alloy plate, a copper alloy plate or a medium / high-entropy alloy plate. According to the method, the preparation of the gradient structure material, especially a large-sizegradient structure strip can be achieved, the surface layer of the obtained material is ultra-fine grains, the core part of the material is coarse grains, and the mechanical properties of an ultra-fine grain material and a coarse grain material are both achieved; and the method is suitable for the material such as aluminum alloy, copper alloy and medium / high-entropy alloy, and has industrial application prospects in the fields of gradient structure material preparation, automobile industries and the like.

Description

technical field [0001] The invention belongs to the technical field of metal material rolling, and in particular relates to a method for preparing gradient structure materials by using deep-cooled rolling rolls. Background technique [0002] With the rapid development of various fields such as aviation industry, automobile industry and electronic communication industry, the demand for lightweight and miniaturized materials is gradually increasing. The preparation of high-performance materials is one of the hot research topics at home and abroad. Large plastic deformation has a strong ability to refine grains, and can directly refine the internal structure of materials to the submicron or even nanometer level. It is an effective preparation method for the preparation of bulk nano / ultrafine-grained materials. It can be known from the Hall-Petch formula that grain refinement can continuously increase the strength of materials. However, for nano / ultrafine grain materials, the re...

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Problems solved by technology

In promoting the industrial application of gradient structure materials, it is necessary to realize the large-scale continuous preparation of gradient structure materials. In the existing preparation methods, the shape and size of the materials to be processed are limited due to the influence of processing methods.

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