Method and equipment for preparing nano material with large thickness and area through acute plastic deformation

Abstract

The invention relates to a method for preparing a nano material with large thickness and area through acute plastic deformation. The method comprises the following steps: adopting carrying current acute stirring friction forced highly undercooled control technology under the action of electromagnetic vibration in-situ compound electromagnetic field to prepare a metallic nano grain material and a ultrafine grain material with large thickness and area; adopting an electromagnetic vibration coil to ensure that a stirring head carries out high-speed stirring and electromagnetic vibration stirring friction composite motion combined with electromagnetic vibration at a certain frequency; and forming an alternating electromagnetic field of a certain intensity inside a workpiece. Under the joint action of carrying current stirring friction and a forced highly undercooled control temperature mechanism, coarse grain structure of the metal surface in a certain thickness undergoes acute plastic deformation and breaks to form stable nano grain and ultrafine grain structure; thus, the method realizes the preparation or surface modification of the metallic nano material with large thickness and area and uniform structure, and can also be used in stirring friction welding.

Description

technical field [0001] The invention relates to a method for preparing nanocrystalline grain structure on the surface of a metal material, in particular to a method for preparing a metal nanocrystalline structure material with a large thickness and a large area and an ultrafine material with a large thickness and a large area under the action of current-carrying stirring friction under the action of electromagnetic vibration and in-situ composite electromagnetic field to force deep supercooling to control severe plastic deformation. Crystal structure materials methods and equipment. Background technique [0002] When the size of the material is less than 100nm, due to the surface effect, quantum size effect, volume effect and quantum tunneling effect, the material exhibits chemical properties, mechanical properties, electrical properties, magnetic properties and optical properties that traditional solids do not have. performance. Due to the special properties of nanomateria...

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Problems solved by technology

[0007] In view of the above-mentioned shortcomings in the preparation of metal nanomaterials by the existing severe plastic deformation method, the purpose of the present invention is to provide a method and equipment for preparing nanomaterials with large thickness and large area through severe plastic deformation with high efficiency, low cost, high stability and high quality. , in order to break through the limitations of the existing severe plastic deformation method to prepare metal nanomaterials, and its long-term constraints on the preparation cost of metal nanomaterials, harsh process conditions, and short service life of key components, and solve the problem of severe friction stirring on the surface of high melting point metals The difficult problem of preparing large-thickness and large-area nanomaterials by plastic deformation method, and enriching the control means of large-thickness and large-area nanomaterials prepared by low-melting point light alloy stir friction severe plastic deformation method, to achieve high-quality metal surface large-thickness and large-area nanomaterials and low Effective coordination of cost-preparation methods, improvement of equipment and technology for the preparation of metal nanomaterials by friction stir severe plastic deformation, so as to expand the scope of nano-manufacturing technology and applications in the field of surface engineering, and provide severe plastic deformation for the preparation of nano-materials using mature mechanical processing technology New technologies to improve the surface properties of engineering structures and their metallic materials

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