Preparation method of copper alloy bar with bamboo joint structure and hard core gradient structure

Abstract

The invention belongs to the field of material preparation, and particularly relates to a preparation method of a copper alloy bar with a bamboo joint structure and a hard core gradient structure. The preparation method comprises the following steps that (1), rotary forging is conducted, specifically, the copper alloy bar is adopted as a raw material, rotary forging is conducted, and a bar of the hard core gradient structure is obtained; (2), longitudinal surface mechanical grinding is conducted, specifically, the bar of the hard core gradient structure obtained in the step (1) is ground through longitudinal surface mechanical grinding, and a bar with a uniform surface nanocrystalline layer is obtained; and (3), transverse surface mechanical grinding is conducted, specifically, transverse surface mechanical grinding is conducted on the bar with the uniform surface nanocrystalline layer obtained in the step (2), and a plurality of annular nanocrystalline layers with the thickness 1.5-3 times that of the surface nanocrystalline layer are obtained on the surface of the bar, in other words, bamboo joints are obtained. According to the preparation method, rotary forging and surface nanocrystallization are combined, the hard core gradient structure and the bamboo joint structure are introduced into a copper alloy, the strength of the copper alloy bar is remarkably improved, and plasticity is reserved.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a method for preparing a copper alloy rod with bamboo joints and a hard core gradient structure. Background technique [0002] Copper alloys have a very wide range of uses. The earliest use of copper alloys can be traced back to more than 3,000 years ago. So far, humans have developed various types of copper alloys in actual production and life. Compared with other alloys, copper alloys have more uses. Many copper alloys have multiple properties at the same time, so they are often used as both structural materials and functional materials. However, when used as structural materials, the strength of various copper alloys is relatively low, which is difficult to meet actual needs; when used as functional materials, people also hope that they have higher strength. Large plastic deformation technology is an effective means to improve the strength of metal materi...

AI Technical Summary

Problems solved by technology

[0005] However, in practical applications, as the cross-sectional area of ​​the sample increases, the ratio of the gradient nanograin layer that can be prepared on the surface of the rod to the radius of the rod will become smaller and smaller, which means that its strengthening effect will also weaken. , so the simple surface nanorization of rods is not suitable for the strengthening treatment of larger diameter rods

Images