Coarse-grain magnesium alloy board with superplasticity and preparation method thereof

A technology of magnesium alloy and superplasticity, which is applied in the field of coarse-grained magnesium alloy sheet and its preparation, can solve the problems of high cost, long production cycle, high requirements for equipment and tooling molds, so as to avoid grain refinement process and reduce production cost , the effect of improving production efficiency

Active Publication Date: 2018-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fine-grained magnesium alloys usually use equal-angle extrusion or rapid solidification to obtain fine grains below 10um. Although alloys with this structure have ideal superplasticity, their processing requires high equipment and tooling molds. Many, long production cycle and high cost, so the wide application in industry is limited

Method used

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  • Coarse-grain magnesium alloy board with superplasticity and preparation method thereof
  • Coarse-grain magnesium alloy board with superplasticity and preparation method thereof
  • Coarse-grain magnesium alloy board with superplasticity and preparation method thereof

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Embodiment 1

[0024] In the embodiment of the present invention, a superplastic coarse-grained magnesium alloy plate is prepared by the following mass percentage components: aluminum 8.5%, silver 0.6%, zinc 0.50%, manganese 0.30%, rare earth: 0.03%, calcium 0.015% %, the balance being magnesium. The preparation method of the superplastic coarse-grained magnesium alloy plate comprises the following steps:

[0025] (1) Melt the magnesium ingot in the temperature range of 710°C, pass inert gas after the magnesium ingot is completely melted, and add manganese chloride, aluminum, zinc, magnesium-rare earth, silver, magnesium-calcium in sequence after the temperature rises to 770°C , into the inert gas for refining, the refining time is 30min, after the refining is completed, the slag is removed, the alloy liquid is left to stand and cooled to the pouring temperature of 700°C for casting into ingots.

[0026] (2) Heating the magnesium alloy ingot to 280°C for 10 hours, and annealing for homogeni...

Embodiment 2

[0029] In the embodiment of the present invention, a superplastic coarse-grained magnesium alloy plate is prepared by the following mass percentage components: aluminum 8.3%, silver 0.1%, zinc 0.35%, manganese 0.25%, rare earth: 0.06%, calcium 0.010 %, the balance being magnesium. The preparation method of the superplastic coarse-grained magnesium alloy plate comprises the following steps:

[0030] (1) Melt the magnesium ingot in the temperature range of 700°C, pass inert gas after the magnesium ingot is completely melted, and add manganese chloride, aluminum, zinc, magnesium-rare earth, silver, magnesium-calcium in sequence after the temperature rises to 770°C , into the inert gas for refining, the refining time is 15min, after the refining is completed, the slag is removed, the alloy liquid is left to stand and cooled to the pouring temperature of 700°C for casting into ingots.

[0031] (2) Heat the magnesium alloy ingot to 270°C for 10 hours, heat-preserve for uniform anne...

Embodiment 3

[0034] In the embodiment of the present invention, a superplastic coarse-grained magnesium alloy plate is prepared by the following mass percentage components: aluminum 8.1%, silver 0.2%, zinc 0.40%, manganese 0.20%, rare earth: 0.05%, calcium 0.008 %, the balance being magnesium. The preparation method of the superplastic coarse-grained magnesium alloy plate comprises the following steps:

[0035](1) Melt the magnesium ingot in the temperature range of 690°C, pass inert gas after the magnesium ingot is completely melted, and add manganese chloride, aluminum, zinc, magnesium-rare earth, silver, magnesium-calcium in sequence after the temperature rises to 760°C , into the inert gas for refining, the refining time is 15min, after the refining is completed, the slag is removed, the alloy liquid is left to stand and cooled to the pouring temperature of 690°C for casting into ingots.

[0036] (2) Heat the magnesium alloy ingot to 260°C for 12h, heat-insulate for uniform annealing,...

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Abstract

The invention relates to a coarse-grain magnesium alloy board with superplasticity and a preparation method thereof, and belongs to the technical field of magnesium alloys. An alloy comprises the following components in percentage by mass: 7.6-8.9% of aluminum, 0.02-0.70% of silver, 0.35-0.55% of zinc, 0.15-0.35% of manganese, 0.02-0.08% of rare earth, 0.001-0.02% of calcium, and the balance of magnesium. The preparation method comprises the steps of smelting, casting, turning and peeling, uniform annealing and extrusion. The grain size of the obtained coarse-grain magnesium alloy board is 45-60 microns; the transverse ductility of the board can reach 420-550%; the longitudinal ductility can reach 640-730%; excellent high-temperature superplasticity is achieved; and superplastic forming can be directly performed without needing complicated thermal mechanical grain refining treatment, so that the production cost can be effectively reduced.

Description

technical field [0001] The invention relates to a superplastic magnesium alloy and a preparation method thereof, in particular to a superplastic coarse-grained magnesium alloy plate and a preparation method thereof. technical background [0002] Metal magnesium and magnesium alloys are the lightest structural materials used in engineering so far. Magnesium alloys are widely used in aerospace, automobile manufacturing and other industries due to their low density, high specific strength, high specific stiffness and high electronic shielding properties; and because magnesium alloys are easy to be recycled, they have become green and environmentally friendly structural materials in the 21st century. However, its plasticity at room temperature is poor, forming is difficult and it is easy to crack. It is difficult to process high-precision parts required by aerospace with conventional stamping, bending, and forging processing methods. The use of superplastic forming technology c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
CPCC22C1/03C22C23/02C22F1/06
Inventor 刘楚明刘运峰万迎春高永浩蒋树农
Owner CENT SOUTH UNIV
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