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Preparation method of magnesium alloy wire based on severe plastic deformation

A technology of severe plastic deformation and magnesium alloy, which is applied in the field of magnesium alloy wire drawing and preparation, to achieve the effect of reducing energy consumption, excellent comprehensive mechanical properties, and improving strength and plasticity

Inactive Publication Date: 2013-07-03
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is still a lot of room for improvement in the existing magnesium alloy drawing process by refining the original grains before drawing

Method used

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  • Preparation method of magnesium alloy wire based on severe plastic deformation
  • Preparation method of magnesium alloy wire based on severe plastic deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] AZ31 magnesium alloy was used for wire preparation, and its composition was Al 3.0wt%, Zn 1.0wt%, Mn 0.2wt%, and the rest was Mg and unavoidable impurities. Specific steps are as follows:

[0026] (a) After mixing the alloy raw materials in 0.1at% SF 6 +CO 2 Melting is carried out under the protection of mixed gas. After the raw materials are completely melted, they are cast at 680°C in a circular pure copper water-cooled mold with an inner diameter of Φ30mm;

[0027] (b) Hot-extrude the ingot at 300°C into a thin round bar of Φ5mm, the extrusion ratio is 36, and the extrusion speed is 20mm / s;

[0028] (c) Cut the extruded round bar into sections with a length greater than 150mm, and then put it into an equal-channel angular extrusion die with a channel angle of 90° and no arc at the corner, and perform 8 passes of angular extrusion at 200°C , the extrusion speed is 5mm / s. After each round of equal-channel angular extrusion, the extruded bar is rotated 90° in the sam...

Embodiment 2

[0033] Prepare Mg-Al alloy, its composition is Al 2.5wt%, Zn 0.5wt%, Mn 0.5wt%, the rest is Mg and unavoidable impurities.

[0034] The process method of this example is different from Example 1. In step (a), the molten alloy is cast into a Φ20mm round rod ingot at a casting temperature of 700°C; in step (b), the ingot is extruded at 360°C into a Φ5mm ingot. Thin round bar, the extrusion ratio is 16, and the extrusion speed is 25mm / s; in step (c), put the cut extruded bar into an equal-channel corner extrusion die with a channel angle of 90° and a corner arc of 30°C Inside, 6 passes of angular extrusion were carried out at 300°C, and the extrusion speed was 2mm / s; in step (d), the equal-channel extruded rod was subjected to room temperature dry drawing, and the drawing speed of each pass was controlled at 60mm / s, the reduction of area of ​​the adjacent pass is 13.1±1%, when the multi-pass drawing reaches the cumulative reduction of area of ​​67.5±1%, the intermediate annealin...

Embodiment 3

[0037] The Mg-Al alloy is prepared, its composition is Al 6.5wt%, Zn 1.5wt%, Mn 1.0wt%, the rest is Mg and unavoidable impurities.

[0038] The difference between the process method of this example and Example 1 is that in step (a) the raw materials to be prepared are completely melted and the alloy melt is cast into a Φ32mm round rod ingot at 720°C; in step (b) the ingot is extruded at 340°C Press a thin round bar with a diameter of Φ8mm, the extrusion ratio is 16, and the extrusion speed is 30mm / s; in step (c), put the cut extruded rod into an equal channel with a channel angle of 90° and a corner arc of 20°C In the corner extrusion die, 4 passes of corner extrusion were carried out at 260°C, and the extrusion speed was 3mm / s; The speed is controlled at 60~65mm / s, and the area reduction rate of adjacent passes is 12.6±1%. When the multi-pass drawing reaches the cumulative area reduction rate of 65.8±1%, intermediate annealing is performed, and the annealing temperature is 20...

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Abstract

The invention discloses a preparation method of a magnesium alloy wire based on severe plastic deformation. The method comprises the following steps of: first, melting and pouring a magnesium alloy material to pole cast ingots with the diameter over 20mm; then, thermally extruding the cast ingots to fine pole bars with the diameter of 5-8mm at extrusion ratio of 16-36 at 300-360 DEG C; after sectioning the extruded poles and extruding the poles with 4-8 paths of equal channel corners at 200-300 DEG C; then, drawing the bars at room temperature; when the material accumulative percentage reduction of area is 70+ / -5%, annealing at 150-200 DEG C for 3-10 minutes; and repeating drawing and annealing till wires in required dimension are prepared. According to the invention, severe plastic deformation is performed on the magnesium alloy bars through an equal channel extruding process before drawing to greatly reduce the original grain size of magnesium alloy to be drawn, so that the drawing performance of the magnesium alloy and the comprehensive mechanical performance of final wires can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of plastic forming of non-ferrous metals, and relates to a drawing preparation method of magnesium alloy wire based on severe plastic deformation. Background technique [0002] Due to its unique characteristics of light weight and high strength, under the background of energy saving and environmental protection, its application and development have made great progress in recent years, which has also driven the demand for magnesium alloy wire in various industries. Magnesium alloy wire can not only be used as welding wire for welding and forming, but also can be made into braided materials, wire composite materials and biomedical implant materials for use in different fields, and this is also the focus of magnesium alloy researchers in the future. [0003] At present, although magnesium alloy wires with a diameter of 1~2 mm can be processed by conventional hot extrusion methods, it is quite difficult for hot extrusion ...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 白晶刘欢彭婷婷薛烽周健孙扬善
Owner SOUTHEAST UNIV
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