A preparation method of multi-grain scale multi-layer high-entropy alloy

Abstract

The invention belongs to the field of material preparation, in particular to a preparation method of a multi-grain scale multilayer high-entropy alloy. It includes the following steps: (1) Pretreatment: select two or more high-entropy alloys, the high-entropy alloys are single-phase and do not undergo phase transformation during heating, and the high-entropy alloys contain at least one FCC and BCC structure Single-phase; (2) Casting: perform solid-liquid inlay casting of liquid high-entropy alloy and solid high-entropy alloy to form multi-layer high-entropy alloy; (3) Rolling: cut multi-layer high-entropy alloy to obtain multi-layer high-entropy alloy The alloy ingot is rolled to obtain a multi-layer high-entropy alloy in a rolled state; (4) multi-grain size formation: heat treatment is performed on the multi-layer high-entropy alloy in a rolled state to obtain a multi-grain-scale multi-layer high-entropy alloy. The present invention adopts the method of multi-alloy solid-liquid mixed casting, and the prepared high-entropy alloy has both the toughness and strength of the soft phase and the hard phase to a certain extent, and obtains high-strength and high-toughness dual- or multi-system fine crystals with good comprehensive properties. Strengthened high-entropy alloys.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a method for preparing a multi-grain-scale multilayer high-entropy alloy. Background technique [0002] At present, the traditional alloys used on a large scale are mainly based on one or two elements, and then adding a small amount of other elements to change the structure and properties of the material to meet the performance requirements of the use, and for a long period of time, material scientists They can only be limited to this when designing alloys. They believe that too many elements in the alloy will cause complex intermetallic compounds to appear, and the material properties cannot meet the application requirements. [0003] In the 1990s, Professor Junwei Ye and Professor Cantor proposed a new material design method almost at the same time. Compared with traditional alloys, one or two elements are mainly used, and a small amount of other trace elements are added to ...

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Problems solved by technology

However, the multi-grain-scale high-entropy alloy prepared in this way can only target one type of high-entropy alloy, and cannot use multiple high-entropy alloys for comprehensive performance, and the way of strengthening and toughening is relatively simple; when a single high-entropy alloy costs When higher, the cost of high-entropy alloys cannot be controlled and the heat resistance is poor

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