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Method for pressurizing and solidifying magnesium alloy

A magnesium alloy, cooling and solidification technology, applied in the field of casting, can solve the problems of high production cost, achieve the effect of reduced impurity components, convenient operation, and dense structure

Inactive Publication Date: 2016-02-17
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the problems existing in the prior art, the present invention provides a method for pressurized solidification of magnesium alloys, which solves the problem in the prior art that the pressurized solidification process can only produce large quantities of large parts and the production cost is extremely high

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  • Method for pressurizing and solidifying magnesium alloy
  • Method for pressurizing and solidifying magnesium alloy
  • Method for pressurizing and solidifying magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present embodiment provides a kind of method for press solidification magnesium alloy, and this method comprises the following steps:

[0026] Step 1, put the magnesium alloy raw material into a crucible resistance furnace for smelting, the melting temperature is 800°C, keep it warm for 20 minutes, then add refining agent (conventional refining agent in the field of magnesium smelting) to refine and remove slag, and at the same time stir and mix evenly, put The smelted magnesium alloy melt is poured into the sealed cavity, and the sealed cavity is sealed after the magnesium alloy raw material is cooled.

[0027] The material of the sealing cavity is No. 45 steel, and the sealing cavity is a tubular container, which is placed horizontally, and the middle position of the tubular container is used as the center axis of rotation for centrifugal rotation. The cross section of the tubular container is circular, and the cavity of the tubular container The size is Φ25×300mm...

Embodiment 2

[0034] This embodiment provides a method for pressurized and solidified magnesium alloys. The other steps of the method are the same as in Embodiment 1, the only difference is that the cross-section of the tubular container is different. This embodiment adopts a circular cross-section, a rectangular cross-section and a diamond-shaped cross-section respectively. , a β-phase concentration distribution effect model was made for the final product obtained, as shown in Figure 5. From Figure 5, it can be seen that among the three cavities with different cross-sectional shapes, the cavity with a circular cross-section has the most obvious effect. But it is not conducive to casting and sampling, and the specific operation is more difficult; the effect of the rhombus-shaped cavity is better, and there are obvious accumulations on both sides of the long diagonal line. The two sharp corners on the line are changed to short sides, and the shape is changed to a symmetrical hexagon formed by...

Embodiment 3

[0036] This embodiment provides a method for pressurized and solidified magnesium alloys. The other steps of this method are the same as those in Embodiment 1, the only difference being that the centrifugal rotation method is different. This embodiment adopts the following centrifugal rotation method:

[0037] (a) rotating speed 400rpm, rotate 5min;

[0038] (b) rotate at 400rpm for 1min, then rotate at 1400rpm for 4min;

[0039] (c) rotate at 400rpm for 2min, then rotate at 1400rpm for 3min;

[0040] (d) Rotate at 400rpm for 3min, then rotate at 1400rpm for 2min;

[0041] (e) Rotate at 400rpm for 4min, then rotate at 1400rpm for 1min;

[0042] (f) Rotate at 1400rpm for 5min.

[0043] Use the same sample to carry out the above 6 different rotation schemes to test, observe the structure of the metal samples obtained under the 6 different schemes, take metallographic photos of different regions of the sample, use the graphic method to calculate the phase content of each sampl...

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Abstract

The invention provides a method for pressurizing and solidifying magnesium alloy. The method includes the steps that a magnesium alloy raw material is heated to be melted in a sealed cavity, the sealed cavity is centrifugally rotated, and a magnesium alloy cast sample is obtained after cooling and solidifying; the cross section of a tubular container is in a round shape or in a symmetric hexagonal shape which is formed by connecting and splicing the bottom edges of two isosceles trapezoids; and according to a centrifugal rotation manner, rotation is conducted at a low speed firstly, and then rotation is conducted at a high speed. The solidification method is convenient to operate, centrifugal force is used for pressurizing and solidifying, impurities are separated, and the denser magnesium alloy cast sample is obtained; and a traditional method for preparing magnesium alloy is improved, impurity components of the prepared magnesium alloy are reduced, the texture is dense, and the microscopic structure is obviously refined. A metal cast die manufactured through a crucible resistance furnace is used for centrifugation, manufacturing is simple and convenient, feasibility is high, energy consumption is reduced, and cost is saved. The method is suitable for manufacturing light and precise parts of instruments and vehicles such as automobiles in the industries of aerospace and electronics.

Description

technical field [0001] The invention belongs to the field of casting and relates to magnesium alloys, in particular to a method for pressurizing and solidifying magnesium alloys. Background technique [0002] Magnesium is the third largest metal engineering material after steel and aluminum. It has many excellent properties and has a very wide application prospect. With the breakthrough of the two bottlenecks of technology and price, the global consumption of magnesium is increasing rapidly at an annual rate of 20%, which is unprecedented in the application of modern engineering metal materials. As the lightest engineering metal materials, magnesium and its alloys have a series of advantages such as light specific gravity, high specific strength, good damping and machinability, good thermal conductivity, strong electromagnetic shielding ability, good vibration damping and easy recycling. It meets the requirements of weight reduction, energy saving, environmental protection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/08
Inventor 马幼平杨蕾邵煜波邹龙龙
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY