Layered multilevel heterostructure metal material with adjustable period and preparation method thereof

Abstract

The invention discloses a layered multilevel heterostructure metal material with an adjustable period and a preparation method thereof. U-shaped grooves are formed in the upper surface and the lower surface of an alloy plate, so that a grooved area and a non-grooved area generate plastic deformation of different degrees in the rolling deformation process, and during subsequent annealing, recrystallization driving forces of the two areas are remarkably different, so that crystal grains with larger size difference are generated, the transition fillet angle positions of the U-shaped grooves can prevent cracking caused by stress concentration at the bottoms of the grooves in a cold rolling process, the transition fillet angle positions have a strain gradient, crystalline grains with the sizes distributed in a gradient mode are generated in the annealing process, and in addition, the layer number modulation period and the characteristic size of each period can be flexibly changed according to the specific material size and actual requirements. The preparation method is simple and feasible, special machining heat treatment equipment does not need, layered, gradient and multi-mode grain structures can be integrated on the same block material at the same time through the same technology, good universality and economical efficiency are achieved, and the preparation method has great engineering application prospects.

Description

technical field [0001] The invention belongs to the technical field of heterostructure metal material preparation, and in particular relates to a period-adjustable multilevel heterostructure metal material and a preparation method thereof. Background technique [0002] Micro-heterogeneous control is a design concept of metal materials that has emerged in recent years. This design concept regulates the mechanical incompatibility between the component units at different macroscopic and micro scales to promote the interactive constraint between the component units under the load condition, so that the mechanical properties of the heterogeneous units can be stimulated at the same time, so that the overall performance of the material can be improved. High strength and toughness. In the heterostructure, the back stress generated by the interaction of coarse and fine grains greatly improves the strain hardening ability of the soft region, greatly improves the strength of the soft ...

AI Technical Summary

Problems solved by technology

However, there are many problems in the preparation methods. For example, the solid-solid phase composite process in the preparation of layered materials depends on strong interface metallurgical bonding strength and high-vacuum and high-purity environmental equipment to prevent interface oxide layer or pollution. Interface defects and other issues

The preparation of gradient materials is based on the premise that there is a large difference in plastic deformation between the surface layer and the core of the material, and it relies heavily on special preparation equipment, such as surface mechanical grinding and surface laser shock, etc., and it is currently difficult to prepare large-sized blocks with different processes gradient material

The preparation of multi-modal materials relies more on special large-deformation equipment such as equal-channel extrusion and high-pressure torsion, and is extremely sensitive to deformation and annealing processes, making it difficult to precisely control the structure

Moreover, the current heterogeneous materials generally have a single layered or gradient or multi-modal grains, without integrating multiple structures in the same material, it cannot effectively stimulate its potential plastic deformation and strengthening mechanism, and further optimize the mechanical properties.

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