A method for preparing gradient structure materials by using deep-cooling rolls

Abstract

A method for preparing gradient structure materials by using cryogenic rolls. The alloy plate is put into a heating furnace, and the heating temperature is (0.7-0.9) Tm, where Tm is the melting point of the alloy plate material; the cryogenic treatment device is turned on, and the working The temperature of the roll is reduced to -150--100°C; the alloy plate is taken out from the heating furnace and sent to the continuous rolling unit for continuous rolling. After the rolled piece passes through the roll, the reduction rate of each pass is 1-5%, and the total reduction of the rolled piece The ratio is 30‑50%, and the gradient structure plate is obtained. The alloy plate of the present invention may be aluminum alloy, copper alloy or medium / high entropy alloy plate. The invention can realize the preparation of gradient structure materials, especially large-scale gradient structure strips. The surface layer of the obtained material is ultrafine grains and the core is coarse grains, which has both the mechanical properties of ultrafine grain materials and coarse grain materials. The present invention It is suitable for aluminum alloys, copper alloys, medium / high entropy alloys and other materials, and has industrial application prospects in the preparation of gradient structural materials and the automotive industry.

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...

AI Technical Summary

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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