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Method for refining crystalline grains of wrought magnesium alloy at room temperature

A deformed magnesium alloy, room temperature technology, applied in the field of magnesium alloy materials, can solve problems such as not suitable for commercial production, achieve easy yield, and expand the use of the effect

Active Publication Date: 2015-12-02
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes for refining the grains of magnesium alloys refine the grains through large plastic deformation under heating conditions, but large plastic deformations usually cause strong textures, resulting in mechanical anisotropy
And these grain refinement methods are not suitable for commercial production due to their own process limitations.

Method used

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  • Method for refining crystalline grains of wrought magnesium alloy at room temperature
  • Method for refining crystalline grains of wrought magnesium alloy at room temperature
  • Method for refining crystalline grains of wrought magnesium alloy at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The method for refining the deformed magnesium-zinc-manganese alloy at room temperature in this embodiment includes the following steps:

[0031] 1) The magnesium alloy ingot is extruded and deformed at 350℃, the extrusion ratio is 16, and the extrusion speed is 50mm / min;

[0032] 2) Process the wrought magnesium alloy bar prepared in step 1 into a funnel-shaped sample. The surface of the sample is smoothed with sandpaper, and the roughness is between 0.32. The microstructure diagram of the magnesium-zinc-manganese alloy bar is as follows figure 1 Shown

[0033] 3). Clamp the sample prepared in step 2 on the fatigue testing machine for tension-compression cyclic loading, the loading frequency is 40Hz, the loading method adopts stress control, the loading stress is 123Mpa (65% yield strength), and the cycle loading cycle is 2.4× 10 6 Times, figure 2 This is the microstructure diagram of the magnesium alloy obtained in Example 1.

Embodiment 2

[0035] The method for refining the deformed magnesium-zinc-manganese alloy at room temperature in this embodiment includes the following steps:

[0036] 1) The magnesium alloy ingot is extruded and deformed at 350℃, the extrusion ratio is 16, and the extrusion speed is 50mm / min;

[0037] 2) Process the wrought magnesium alloy bar prepared in step 1 into a funnel-shaped sample, and the surface of the sample is smoothed with sandpaper, and the roughness is between 0.32;

[0038] 3). Clamp the specimen prepared in step 2 on the fatigue testing machine for tensile-pulling cyclic loading, the loading frequency is 40Hz, the loading method adopts stress control, the loading stress is 160Mpa (85% yield strength), and the cycle loading cycle is 2.3× 10 6 Times, image 3 This is the microstructure diagram of the magnesium alloy obtained in Example 2.

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Abstract

The invention discloses a method for refining the crystalline grains of a wrought magnesium alloy at a room temperature. The method comprises the following steps: 1) preparing the wrought magnesium alloy into a sample convenient to clamp by a fatigue testing machine, and controlling a surface roughness to be between 0.8 to 0.2; 2) loading the sample prepared in the step 1) on the fatigue testing machine, measuring the yield strength of the sample at first, and then refining the crystalline grains by means of repeated tensile-press loading at a room temperature, with a tensile-press loading cyclic stress occupying 55-70% of the yield strength, or refining the crystalline grains by means of repeated tensile-tensile loading at a room temperature, with a tensile-tensile loading cyclic stress occupying 70-90% of the yield strength. Compared with the traditional method for refining the crystalline grains of a magnesium alloy, magnesium alloy bar materials are free from macroscopic plastic deformations in each cyclic loading period; by using the method disclosed by the invention for refining the crystalline grains of the magnesium alloy, conventional deformations and heating equipment are not needed, and the temperatures of the materials are not obviously increased during the whole treatment process; and the treated alloy is obviously refined in crystalline grain sizes and uniform in organization.

Description

Technical field [0001] The invention belongs to the field of magnesium alloy materials and relates to a method for refining deformed magnesium alloy crystal grains at room temperature. Background technique [0002] As the lightest structural material, magnesium alloy has many advantages that other alloys cannot match: magnesium alloy is 36% lighter than aluminum alloy and 77% lighter than steel; it is the metal with the highest specific strength among practical metals; it has excellent impact resistance and Vibration resistance, electromagnetic shielding and cutting performance. Therefore, magnesium alloy is known as a clean material that is green, recyclable and does not pollute the environment in the 21st century, and is expected to be widely used in aerospace, automotive, weaponry, 3C products and other fields. [0003] Due to the close-packed hexagonal structure of the magnesium alloy, the magnesium alloy has strong mechanical anisotropy and poor plastic forming ability. The ...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 张丁非余大亮潘复生孙静谌夏柴森森蒋璐瑶郭非
Owner CHONGQING UNIV
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