Continuous twisting and drawing device and method for preparing heterogeneous magnesium alloy rods

Abstract

The invention belongs to the field of material preparation, and in particular relates to a continuous twisting and drawing device and method for preparing heterogeneous magnesium alloy rods. Including twisting unit: including two clamping and rotating shafts, used to twist and hinge multiple magnesium / magnesium alloy bars arranged in parallel; drawing unit: set at the rear of the twisting unit, used for twisting and deforming the twisting Afterwards, the rods are drawn; heat treatment unit: solid solution aging treatment is performed on the drawn rods, so that the elements precipitated during deformation can be solid-dissolved into the matrix again, and aging can obtain heterogeneous magnesium with different precipitated phase densities. alloy. In the present invention, through the combination of twisting and drawing deformation, and through the subsequent solid solution aging heat treatment, the characteristics of different precipitation behaviors of various magnesium alloys under the same aging treatment are used to regulate their microstructure, so that the magnesium The soft and hard phases in the alloy material are alternately distributed in the axial and radial directions, and a high-strength and high-toughness heterogeneous magnesium alloy material with three-dimensional direction controllable multi-scale precipitation is obtained.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a continuous twisting and drawing device and method for preparing heterogeneous magnesium alloy rods. Background technique [0002] Due to the increasingly serious problems of energy shortage and air pollution, energy saving and emission reduction have become an important issue of social concern. Magnesium is one of the most abundant elements on the earth, and magnesium alloys, as metal structural materials with the lightest specific gravity, have very broad application prospects in industrial production. However, the absolute strength of magnesium alloys is low, which limits their large-scale application in production. Studies have shown that precipitation strengthening is one of the most effective means to improve the strength of magnesium alloys. Adding rare earth elements to magnesium alloys can form high-density nanoscale precipitates in the matrix through a...

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Problems solved by technology

However, this technology also has the following problems: (1) Due to the limitation of equipment, the size of heterogeneous materials prepared by this method is relatively small, which limits its industrial application; (2) It is difficult to make two materials by simple high-pressure torsional deformation The interface is well bonded, and the mechanical properties of the obtained material are unstable

However, this technology also has the following problems: (1) the rolling deformation method restricts the product type to plate, and it is difficult to realize the production of bar-shaped profiles; It is difficult to control interface oxidation, inclusions, and entrainment, and the yield is low

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