Preparation Technology of Porous Copper-based Shape Memory Alloy by Equal Angle Extrusion

Abstract

A preparation process of porous copper-based shape memory alloy by equal angular extrusion method, characterized in that: first, the mixed Cu-Zn-Al powder is pressed and sintered through a simple pressing die, and then the sintered compact is subjected to multiple passes The ECAP-T) forming of the powder sintered body breaks the grains of the powder sintered body, produces sub-grains, nucleates a large number, and refines the grains; then the porous The copper-based shape memory alloy material with good performance can be prepared by sintering the copper-based blank, performing quenching heat treatment, and finally performing solution treatment. Compared with the prior art, the present invention omits the powder smelting, casting, repeated hot forging, multiple rolling and other forming processes necessary for the preparation of traditional porous copper-based shape memory alloys in the whole preparation process, greatly reducing the preparation cost, The production process is simple, the process line is short, and the green environmental protection effect is strengthened. In terms of the characteristics of the entire preparation process, this process has the characteristics of conventional preparation processes for porous copper-based shape memory alloys, such as hot isostatic pressing, conventional powder sintering, and sintering evaporation.

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) is a new technology and process for metal plastic forming, while Equal Channel Angular Pressing and Torsion (ECAP-T) is a new technology invented in the early 21st century. The new SPD technology is a combination of two large plastic forming processes, equal-diameter angular extrusion (ECAP for short) and equal-channel extrusion and twisting (abbreviated TE), to form a new method of equal-diameter angular extrusion die structure and material forming technology. (ECAP-T). There are two plastic deformation areas in the mold 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, extrusion twist Angle, channel length, etc. can be c...

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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

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