Magnesium-aluminium-zinc alloy containing rare earth and its preparing method

A magnesium-aluminum-zinc alloy technology, which is applied to high plasticity, can solve the problems of expensive lubricants and the mechanical properties of materials need to be improved, and achieve the effects of improving mechanical properties, low extrusion force, and improved room temperature elongation.

Inactive Publication Date: 2005-05-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology has strict limitations, the lubricant is expensive, and the mechanical properties of the prepared materials need to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Alloy billet preparation

[0029] Magnesium alloy blanks were prepared by sand casting.

[0030] Alloy composition (mass percentage):

[0031] Aluminum: 3.0%

[0032] Zinc: 0.5%

[0033] Manganese: 0.3%

[0034] Mixed rare earths containing 50% cerium and 40% lanthanum: 0.3%

[0035] The rest is magnesium and unavoidable trace impurities.

[0036] The ingot is forward extruded at 250-300° C. with an extrusion ratio of 4:1 to prepare a magnesium alloy billet of desired shape.

[0037] Step 2: Warm up

[0038] Heating the alloy billet under the air atmosphere in the heat treatment furnace, the heating temperature is 200-250°C, the holding time is 1 hour, and the mold is heated, the mold temperature is 250-300°C.

[0039] Step 3: Equal channel corner extrusion

[0040] Take the preheated billet out of the heat treatment furnace, quickly put it into the equal-channel angular extrusion die, extrude the alloy billet, use...

Embodiment 2

[0045] Step 1: Alloy billet preparation.

[0046] Magnesium alloy blanks were prepared by sand casting.

[0047] Alloy composition (mass percentage):

[0048] Aluminum: 6.0%

[0049] Zinc: 1.0%

[0050] Manganese: 0.6%

[0051] Mixed rare earths containing 50% cerium and 40% lanthanum: 0.5%

[0052] The rest is magnesium and unavoidable trace impurities.

[0053] The ingot is forward extruded at 280-320° C. with an extrusion ratio of 3:1 to prepare a magnesium alloy billet of desired shape.

[0054] Step 2: Warm up

[0055] Heating the alloy billet under the air atmosphere in the heat treatment furnace, the heating temperature is 300-350°C, the holding time is 0.5 hours, and the mold is heated, the mold temperature is 200-250°C.

[0056] Step 3: Equal channel corner extrusion

[0057] Take the preheated billet out of the heat treatment furnace, put it into the equal-channel angular extrusion die quickly, and e...

Embodiment 3

[0062] Step 1: Alloy billet preparation

[0063] Magnesium alloy blanks were prepared by sand casting.

[0064] Alloy composition (mass percentage):

[0065] Aluminum: 2.5%

[0066] Zinc: 1.5%

[0067] Manganese: 0.5%

[0068] Mixed rare earths containing 50% yttrium and 10% lanthanum: 0.1%

[0069] The rest is magnesium and unavoidable trace impurities.

[0070] The ingot is forward extruded at 200-240° C. with an extrusion ratio of 8:1 to prepare a magnesium alloy billet of desired shape.

[0071] Step 2: Warm up

[0072] Heating the alloy billet under the air atmosphere in the heat treatment furnace, the heating temperature is 250-300° C., and the holding time is 2 hours. Heat the mold, mold temperature: 150-200°C.

[0073] Step 3: Equal channel corner extrusion

[0074] Take the preheated billet out of the heat treatment furnace, put it into the equal-channel angular extrusion die quickly, and extrude the a...

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Abstract

The invention relates to metal plastic forming technology, in particular to a rare earth-containing magnesium-aluminum-zinc alloy and a corresponding preparation method thereof. The components and mass percentage of the material are: 2.0-6.0% aluminum, 0.3-1.5% zinc, 0.3-0.6% manganese, 0.1-0.5% rare earth, and the rest are magnesium and unavoidable trace impurities. The invention combines the alloying of rare earth elements and the plastic deformation process of equal channel angular extrusion, and has remarkable effects on the refinement of the microstructure of the magnesium alloy and the improvement of the strength and toughness of the material. The room temperature tensile strength of the magnesium alloy obtained by the preparation method is above 260MPa, and the normal temperature elongation is above 45%. The material prepared by the present invention has the characteristics of high strength and high plasticity, not only overcomes the shortcomings of low strength and low elongation of cast magnesium alloys, but also has a large plasticity compared with magnesium alloys prepared by conventional hot extrusion technology. improve. In addition, compared with the conventional hot extrusion process, the extrusion force required for forming by the preparation method is very low, thereby reducing the requirements for forming equipment.

Description

technical field [0001] The invention relates to metal plastic forming technology, in particular to a rare earth-containing magnesium-aluminum-zinc alloy with high strength and high plasticity and a preparation method thereof. Background technique [0002] Magnesium has a close-packed hexagonal crystal structure, and its plastic deformation ability is poor. Magnesium alloys are difficult to deform and process, which limits the large-scale industrial production and application of its parts. Equal-channel angular extrusion technology (also known as equal-diameter lateral extrusion technology) is a new technology that obtains large plastic deformation through repeated deformation to obtain ultra-fine-grained or even nano-structured materials. Compared with traditional metal plastic processing technology Compared with the equal-channel angular extrusion technology, the deformation can be realized without changing the macroscopic cross-sectional shape of the material. Due to the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C23/00C22C23/02C22F1/06
Inventor 李元元张大童张卫文刘英李小强
Owner SOUTH CHINA UNIV OF TECH
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