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Method for surface nanocrystallization modification of metal material and preparation of nanometer-micrometer gradient structure

A metal material and gradient structure technology, applied in the field of material surface treatment, can solve the problems of long treatment time and high treatment temperature, and achieve the effect of improving surface nanometerization quality, high treatment efficiency, and optimizing surface structure and performance.

Active Publication Date: 2018-01-16
咸阳瞪羚谷新材料科技有限公司
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Problems solved by technology

The surface mechanical grinding treatment (SMAT) reported in references 3-7, and the "method for surface modification of metal materials using surface mechanical grinding treatment" disclosed by Li Wei et al. in the invention patent CN102560508A. , the use of SMAT technology to improve the surface properties of metal materials, this method takes a long time to process, and the processing temperature is high

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  • Method for surface nanocrystallization modification of metal material and preparation of nanometer-micrometer gradient structure

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0034] The present invention is based on the transformation of the tool head of the ordinary friction stir welding device, and develops a novel Surface Mechanical Rolling Grinding Treatment (SMRGT) method, which is a method for nano-modification of the surface of metal materials: The surface layer is subjected to multi-layer mechanical rolling grinding to prepare surface nanocrystals, so as to realize the surface self-nanoization of the metal material surface modification, wherein each layer of mechanical rolling grinding is based on the area of ​​the tool head and the surface area of ​​the metal material that needs surface treatment, through the tool The multi-pass mechanical rolling grinding of the head is completed step by step.

[0035] The design of the tool head and the nano-modification process of the Mg alloy surface are as follows ( ...

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Abstract

The invention provides a method for surface nanocrystallization modification of a metal material and preparation of a nanometer-micrometer gradient structure. According to the method, a semisphericaltool head is prepared from hot work die steel, and the semispherical surface of the tool head is polished; multilayer multi-pass small-strain indentation of mechanical rotary grinding is carried out on the surface of a Mg alloy plate, wherein a rotation speed is 110 to 130 rpm, the preset indentation depth of the semispherical tool head is 50 [mu]m each pass, and a feeding speed is 10 to 30 mm / min; lubricating oil is used in each pass to reduce friction and temperature. The method provided by the invention is high in treatment efficiency, can realize surface nanocrystallization modification ofthe metal material at normal temperature, prepares a surface layer with a gradient structure and a fine-grain surface, and optimizes the surface structure and performance of the metal material, so the integral performance of the metal material is improved.

Description

technical field [0001] The invention relates to a method for preparing metal material surface nano-modification and nano-micron gradient structure, and belongs to the technical field of material surface treatment. Background technique [0002] In order to improve the overall properties of materials through nano-modification of metal surfaces, it is necessary to optimize the surface structure and properties of metal materials, which has become an important research branch of nano-materials and nano-technology. Mg alloy has the properties of low density and high specific strength stiffness, and is known as the "green structural material" in the 21st century. References 1 and 2 point out that the low mechanical properties of magnesium alloys is one of the main bottlenecks hindering its development and application. Among the many means to improve the mechanical properties of magnesium alloys, refining grains through deformation is an important development direction; many materia...

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Application Information

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IPC IPC(8): C22F1/06
Inventor 张贵锋陈碧强徐婷婷朱大恒鲍建东范蒙
Owner 咸阳瞪羚谷新材料科技有限公司
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