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Method for preparing dispersion strengthened copper-based composites through equal channel angular pressing (ECAP)

A dispersion-strengthened copper and equal-channel corner technology is applied to metal extrusion control equipment, metal extrusion, manufacturing tools, etc., to achieve obvious effects, obvious grain refinement, and simple operation

Inactive Publication Date: 2016-04-13
INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersion-strengthened copper-based composites obtained by the above existing preparation methods still need to be strengthened by large-strain plastic deformation after hot extrusion.

Method used

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  • Method for preparing dispersion strengthened copper-based composites through equal channel angular pressing (ECAP)
  • Method for preparing dispersion strengthened copper-based composites through equal channel angular pressing (ECAP)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1% Al after hot extrusion, drawing or swaging 2 o 3 The / Cu copper-based composite material is preheated at 600 °C for 1 hour, and then sent to an equal-channel angular extrusion die that has been preheated to 200 °C and coated with lubricant. The dispersion-strengthened copper-based Composite material rods, plates, pipes, square materials, etc. are extruded, and after each pass of extrusion, the next pass of extrusion is carried out, and a total of 2 passes of extrusion are performed. The scanning electron micrograph of the structure of the aluminum oxide dispersion strengthened copper matrix composite material prepared by equal channel angular extrusion used in this example is as follows figure 2 shown.

Embodiment 2

[0023] 0.8%TiB after hot extrusion, drawing or swaging 2 The / Cu copper-based composite material was preheated at 700 °C for 2 hours, and then sent to an equal-channel angular extrusion die that had been preheated to 300 °C and coated with lubricant. The dispersion-strengthened copper-based Composite material rods, plates, pipes, square materials, etc. are extruded, and after each pass of extrusion, the next pass of extrusion is carried out, and a total of 4 passes of extrusion are performed.

Embodiment 3

[0025] The 0.6% WC / Cu copper-based composite material after hot extrusion, drawing or rotary forging is preheated at 800°C for 3 hours, and then sent to an equal-channel angular extrusion die that has been preheated to 350°C and coated with lubricant Among them, the dispersion-strengthened copper-based composite material rods, plates, pipes, square materials, etc. are extruded at a pressure of 800MPa and an extrusion speed of 20mm / min. After each extrusion, the next extrusion is carried out. A total of 6 extrusion passes were performed.

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Abstract

Disclosed is a method for preparing dispersion strengthened copper-based composites through equal channel angular pressing (ECAP). The dispersion strengthened copper-based composites after hot extrusion, rolling, drawing or rotary swaging forming are sent to an ECAP die (3) which is preheated to 100-500 DEG C and coated with lubricants after preheating at the temperature of 200-900 DEG C and preserving heat for 0.5-5h; dispersion strengthened copper-based composite sticks, plates, tubes, square materials and the like are pressed and formed under pressing pressure (1) of 100-1000MPa at the pressing speed of 1-100 mm / min; the next pressing process is performed after each pressing process, and altogether 2-10 pressing processes are performed. According to the method, grains of the dispersion strengthened copper-based composites are refined effectively; comprehensive performance such as strength, hardness and electric conductivity of the dispersion strengthened copper-based composites is improved; the method has the advantages that operation is easy, machining efficiency is high, and cost is low. The dispersion strengthened copper-based composites prepared through the method can be widely applied to the aviation field, the aerospace field, the electronic field, the manufacturing field and the like.

Description

technical field [0001] The invention belongs to the technical field of forming metal-based composite materials, and in particular relates to a method for preparing dispersion-strengthened copper-based composite materials by equal-channel angular extrusion. Background technique [0002] Equal Channel Angular Pressing (ECAP for short) is a large plastic deformation processing method that causes pure shear deformation to occur when the material passes through the equal channel to refine the grain. Since the 1980s, after the former Soviet scholar Segal proposed the equal-channel angular extrusion technology, scholars at home and abroad have conducted a lot of research on the equipment and processing methods of the equal-channel angular extrusion technology. [0003] Dispersion-strengthened copper-based composites are a kind of particle-reinforced copper-based composites, and their strengthening phases mainly include: Al 2 o 3 , TiB 2 , WC, diamond, graphite, carbon nanotu...

Claims

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Application Information

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IPC IPC(8): B21C23/04B21C29/00B21C31/00
CPCB21C23/001B21C23/002B21C23/04B21C29/003B21C31/00
Inventor 陆德平廖先金陆磊
Owner INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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