A kind of preparation method of ultra-fine grain magnesium alloy extruded bar

A magnesium alloy and ultra-fine grain technology, which is applied in the field of magnesium alloy processing, can solve the problems of difficulty in ultra-fine grain crystallization, large internal stress, complex process, etc., so as to improve comprehensive mechanical properties, large strain, and shorten the preparation process. Effect

Active Publication Date: 2020-08-18
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a method for preparing an extruded rod of an ultrafine-grained magnesium alloy, which solves the problems of complex process, high cost, large internal stress and ultra-fine crystallization of the existing preparation method. difficult question

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  • A kind of preparation method of ultra-fine grain magnesium alloy extruded bar
  • A kind of preparation method of ultra-fine grain magnesium alloy extruded bar
  • A kind of preparation method of ultra-fine grain magnesium alloy extruded bar

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Effect test

Embodiment 1

[0028] 1) Preprocessing:

[0029] After the magnesium alloy ZK60 was treated at 350°C for 12 hours, it was taken out of the furnace and air-cooled to room temperature;

[0030] 2) Deformation processing:

[0031] Start the extrusion device, under the condition of 380 ° C, the extrusion rod is extruded at the extrusion speed of 30 mm / s, and the extrusion ratio of 100:1 is extruded step 1) to obtain the pretreated magnesium alloy ZK60, and at the same time in the extrusion direction Twist the magnesium alloy ZK60 with a traction device for the axis, and the torsion speed is 0.27 r / s, so that the magnesium alloy is violently deformed, and the number of twisted turns per unit length of the ultra-fine-grained magnesium alloy extruded rod is 0.09 r / cm.

[0032] Using a metallographic microscope to observe the microstructure of the low-cost ultra-fine-grained magnesium alloy extruded rods, the results are as follows figure 1 shown.

[0033] From figure 1 It can be seen that the ...

Embodiment 2

[0037] 1) Preprocessing:

[0038] After the magnesium alloy AZ31 was treated at 450°C for 2 hours, it was taken out of the furnace and air-cooled to room temperature;

[0039] 2) Deformation processing:

[0040] Start the extrusion device, under the condition of 350 ° C, the extrusion rod is extruded at the extrusion speed of 28 mm / s, and the extrusion ratio of 25:1 is extruded step 1) to obtain the pretreated magnesium alloy AZ31, and at the same time in the extrusion direction The magnesium alloy AZ31 is twisted by traction equipment for the axis, and the twisting speed is 0.42 r / s, so that the magnesium alloy is violently deformed, and the number of twisted turns per unit length of the ultrafine grain magnesium alloy extruded rod is 0.15 r / cm.

[0041] Using a metallographic microscope to observe the microstructure of the extruded rods of ultra-fine-grained magnesium alloys, the results are as follows: image 3 shown.

[0042] From image 3 It can be seen that the volu...

Embodiment 3

[0046] 1) Preprocessing:

[0047] cast magnesium alloy ingots without heat treatment;

[0048] 2) Deformation processing:

[0049] Start the extrusion device, under the condition of 380 ° C, the extrusion rod is extruded at the extrusion speed of 10 mm / s, and the extrusion ratio is 100:1. Step 1) to obtain the pretreated magnesium alloy AZ31, and at the same time in the extrusion direction Twist the magnesium alloy AZ31 with a traction device for the axis, and the twisting speed is 0.33 r / s, so that the magnesium alloy is violently deformed, and the number of twisted turns per unit length of the ultra-fine-grained magnesium alloy extruded rod is 5 r / cm.

[0050] Using a metallographic microscope to observe the microstructure of the extruded rods of ultra-fine-grained magnesium alloys, the results are as follows: Figure 5 shown.

[0051] From Figure 5 It can be seen that the volume fraction of the structure with grain size smaller than 1.2 μm in magnesium alloy accounts ...

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Abstract

The invention discloses a preparation method of ultra-thin grain magnesium alloy extruded bars. In a process of preparing a magnesium alloy bar by hot extrusion, while being extruded, magnesium alloyis twisted synchronously, thus, the magnesium alloy deform violently under the effect of a composite stress field formed by tensile stress and torsional stress, the structure of the magnesium alloy isrefined effectively, and the comprehensive mechanical property of the deformed magnesium alloy is improved. By the method, a purpose of implementing grain refinement is achieved by a conventional process, low-cost and high-performance deformed magnesium alloy is developed, the deformed magnesium alloy product can be produced by using simple equipment fully, a preparation process is shortened effectively, energy is saved, the cost is reduced, and popularization and application are facilitated.

Description

technical field [0001] The invention relates to a method for preparing a deformed magnesium alloy, in particular to a method for preparing an extruded rod of an ultrafine-grained magnesium alloy, and belongs to the technical field of magnesium alloy processing. Background technique [0002] As the lightest metal structural material, magnesium alloy has the advantages of high specific strength, good heat dissipation and damping performance, and environmental friendliness, and has become one of the most promising metal structural materials. However, magnesium alloys have a close-packed hexagonal crystal structure, have fewer independent slip systems, and have poor room temperature deformability; moreover, magnesium alloys are prone to twin deformation during plastic deformation, resulting in low yield strength and poor tensile and compressive yield. Symmetry, etc., these shortcomings have seriously limited the widespread use of magnesium alloys. Precipitation strengthening, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C23/12B21D11/14
CPCB21C23/002B21C23/12B21D11/14
Inventor 潘复生佘加彭鹏汤爱涛蒋斌
Owner CHONGQING UNIV
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