Preparation method of magnesium alloy variable-section cylindrical member by composite extrusion deformation

Abstract

A preparation method of a magnesium alloy variable-section cylindrical member by composite extrusion deformation is characterized in that the method comprises the following steps: firstly, orderly performing homogenization pretreatment and hot extrusion deformation of an AZ80 magnesium alloy blank; preparing a variable-section cylindrical force-bearing member by forward and backward composite extrusion; finally performing turning and heat treatment to obtain a magnesium alloy variable-section cylindrical member. Compared with the prior art, the invention has the following advantages that the invention can prepare large-size cylindrical members; the material grain is fine; the mechanical properties are high; and the procedures are simple.

Description

technical field [0001] The invention relates to a preparation method of a magnesium alloy cylindrical part with variable cross-section. The magnesium alloy cylindrical part with variable cross-section is mainly used in aircraft as a load-bearing part. Background technique [0002] The weight of the aircraft has a direct impact on the payload capacity, flight speed, and flight maneuverability. Lightweight structural parts can increase the payload capacity, speed up the flight speed, and improve the overall performance of maneuverability. Therefore, the lightweight of aircraft structural parts is always the focus of aircraft development, and the key to lightweight materials and forming technology to achieve lightweight. When aluminum alloy is used to prepare aircraft structural parts, compared with steel, the weight reduction effect can reach 20-25%. However, with the further improvement of the overall performance of aircraft, there is an urgent need for lightweight material...

AI Technical Summary

Problems solved by technology

[0005] The first one is the casting method, which is easy to form, but the casting magnesium alloy has the disadvantages of coarse grains, poor mechanical properties, and prone to defects, which cannot meet the mechanical performance requirements of aircraft load-bearing parts;

[0006] The second method, equal channel angular extrusion (ECAP), can significantly refine the grains of magnesium alloys, but the prepared materials have obvious texture tendencies;

[0007] The third method, the rolling method can prepare materials with excellent uniformity and performance, but it is only suitable for the preparation of plates

Similar technical literature can refer to the Chinese invention patent "Apparatus and method for preparing fine-grained materials by continuous variable cross-section cyclic extrusion" (publication number CN1827829A, authorized announcement number CN100386466C) whose patent number is ZL200610041960.8. Deformation and upsetting deformation are alternately carried out multiple times to obtain cumulative strain, refine the material structure and improve performance. This method requires many processes and requires high process conditions.

You can also refer to the Chinese invention patent application "Apparatus and method for preparing fine-grained materials by direct extrusion with continuous variable cross-section" (publication number CN101767120A) with application number 201010032431.8. It is limited to the preparation of solid materials, and the closure at the outlet end needs to be removed during the preparation process, the process is complicated and the efficiency is low

Although the above extrusion method can refine the structure and improve the material performance to a certain extent, it is limited to the preparation of materials, and due to the characteristics of the process itself, it is currently mostly limited to the preparation of solid materials.

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