Equal channel angular twist extrusion preparation process for porous copper-based shape memory alloy

Abstract

The invention discloses an equal channel angular twist extrusion preparation process for a porous copper-based shape memory alloy. The process is characterized by comprising the following steps: pressing and sintering the mixed Cu-Zn-Al powder by virtue of a simple pressing mold; performing multi-pass equal channel angular twist extrusion (ECAP-T) formation on the sintered blank, so that the grains of the powder sintered body are crushed, sub-grains and lots of nucleation are generated, and the grains are refined; performing quenching heat treatment on the porous sintered copper-based blank subjected to multi-pass equal channel angular twist extrusion, finally obtaining solution treatment, thereby obtaining the copper-based shape memory alloy material with good preparation performance. Compared with the prior art, the process disclosed by the invention has the advantages that the formation processes such as powder smelting, casting, repeated hot forging and repeated rolling needed in the preparation of the traditional porous copper-based shape memory alloy are omitted in the whole preparation process, the preparation cost is greatly reduced, the production process is simple, the process route is short, and the green and environment-friendly effects are intensified. From the characteristics of the whole preparation process, the process method has the characteristics of the conventional preparation process of the porous copper-based shape memory alloy, such as a hot isostatic pressing method, a conventional powder sintering method, a sintering evaporation method and the like.

Description

technical field [0001] The invention relates to a novel functional material and a method for preparing a porous copper-based shape memory alloy material. Background technique [0002] Severe plastic deformation (SPD for short) is a new technology and process for metal plastic forming, and Equal Channel Angular Pressing and Torsion (ECAP-T for short) is a new technology invented in the early 21st century. The new SPD technology is a combination of two large plastic forming processes, equal-path angular extrusion (ECAP for short) and equal-channel extrusion and twisting (TE for short), to form a new method of equal-path angular extrusion and twisting die structure and material forming process. (ECAP-T). There are two plastic deformation areas in the cavity of the equal-diameter angular extrusion and twisting die, namely, a corner area and a spiral channel area. The main mold parameters, such as the inner angle, outer angle, helix angle, and extrusion Angle, channel length, et...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation process of porous copper-based shape memory alloy by equal angular extrusion method, which overcomes the disadvantages of conventional porous copper-based shape memory alloy preparation method, such as complicated preparation method, long preparation line, high cost and poor environmental protection effect

Images