Wrought magnesium alloys in high intensity, high plasticity, and preparation method

A deformed magnesium alloy, high plasticity technology, applied in the field of magnesium alloy production, can solve the problems of overheating and overburning, low deformation temperature, low melting point of zinc, etc., and achieve the effect of uniform size, increased strength and good elongation

Active Publication Date: 2007-10-10
NANJING YUNHAI SPECIAL METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the poor plasticity of high-strength deformation materials of magnesium-zinc-zirconium alloys (such as ZK60 magnesium alloys) makes it difficult to control the hot extrusion process conditions
The deformation temperature is too low to fully activate all the slip systems of the magnesium matrix, and the second phase of the alloy hinders the deformation significantly,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 1116kg of magnesium ingots and 54kg of zinc ingots into the prepared clean crucible after pretreatment, add 18kg of RJ-2 bottom flux to melt, sprinkle 3.6kg of RJ-4 covering agent in the process to prevent burning, and control the final temperature of the magnesium liquid At 670°C, the time is controlled at 4h; after melting, raise the temperature to 780°C, slowly add 0.75kg of potassium fluotitanate and 30kg of rare earth element cerium preheated to 300°C in batches, and stir for 3min to make the alloy homogeneous ;Adjust the temperature of the alloy liquid to 750°C, blow argon, and add 18kg of RJ-6 refining agent to refine for 6 minutes; after refining, raise the temperature of the alloy liquid to 780°C and let it stand for 10 minutes; in SF 6 Pouring under protective atmosphere. The weight percent of the chemical composition of the magnesium alloy thus obtained is Zn: 4.5%, Ce: 2.5%, Ti: 0.01%, Si: ≤0.08%, Fe: ≤0.01%, Cu: ≤0.01%, Ni: ≤ 0.002%, other impurity el...

Embodiment 2

[0025] Put 1121kg of magnesium ingots and 60kg of zinc ingots into the prepared clean crucible after pretreatment, add 24kg of RJ-2 bottom flux to melt, sprinkle 4.8kg of RJ-5 covering agent in the process to prevent burning, and control the final temperature of the magnesium liquid At 680°C, the time is controlled at 5h; after melting, raise the temperature to 795°C, slowly add 7.5kg of potassium fluotitanate and 18kg of rare earth element cerium preheated to 300°C in batches, and stir for 4min to homogenize the alloy ;Adjust the temperature of the alloy liquid to 755°C, blow argon, and add 24kg of RJ-5 refining agent to refine for 8 minutes; after refining, raise the temperature of the alloy liquid to 795°C and let it stand for 15 minutes; on SO 2 Pouring under protective atmosphere. The weight percent of the chemical composition of the magnesium alloy thus obtained is Zn: 5.0%, Ce: 1.5%, Ti: 0.10%, Si: ≤0.08%, Fe: ≤0.01%, Cu: ≤0.01%, Ni: ≤ 0.002%, other impurity elements:...

Embodiment 3

[0027] Put 1125.5kg of magnesium ingots and 66kg of zinc ingots into the prepared clean crucible after pretreatment, add 30kg of RJ-2 bottom flux to melt, sprinkle 6.0kg of RJ-6 covering agent during the process to prevent burning, and control the final temperature of the magnesium liquid At 690°C, the time is controlled at 6h; after the melting is completed, the temperature is raised to 810°C, and 15kg of potassium fluotitanate and 6kg of rare earth element cerium preheated to 300°C are slowly added in batches, and the bottom is stirred for 5min to homogenize the alloy; Adjust the temperature of the alloy liquid to 760°C, blow argon, and add 30kg of RJ-4 refining agent to refine for 10 minutes; after refining, raise the temperature of the alloy liquid to 810°C and let it stand for 20 minutes; CO 2 Pouring under protective atmosphere. The weight percent of the chemical composition of the magnesium alloy thus obtained is Zn: 5.5%, Ce: 0.5%, Ti: 0.20%, Si: ≤0.08%, Fe: ≤0.01%, C...

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PUM

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Abstract

This invention discloses a method for preparing Mg alloy with high strength and high plastic deformation. The compositions of the Mg alloy are: Zn 4.5-5.5 wt.%, Ce 0.5-2.5 wt.%, Ti 0.01-0.20 wt.%, Si less than or equal to 0.08 wt.%, Fe less than or equal to 0.01 wt.%, Cu less than or equal to 0.01 wt.%, Ni less than or equal to 0.002 wt.%, impurities less than or equal to 0.05 wt.%, and Mg as balance. The method adds rare earth element Ce to Mg-Zn-Zr alloy, and replaces Zr with Ti, thus can refine the alloy grains. Besides, Mg forms a dispersed reinforcing phase, which can effectively improve the comprehensive properties of the Mg alloy. The surface quality of the extruded product of the Mg alloy is obviously improved when compared with ZK series deformed Mg alloys. The average tensile strength, yield strength and elongation at breakage of the Mg alloy at room temperature are 360 MPa, 245 MPa and 7%, respectively. The average tensile strength and elongation at breakage of the Mg alloy at 150 deg.C are 250 MPa and 11%, respectively.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy production, in particular to a deformed magnesium alloy with high strength and high plasticity. Background technique [0002] At present, the poor plasticity of high-strength deformation materials of magnesium-zinc-zirconium alloys (such as ZK60 magnesium alloys) makes it difficult to control the hot extrusion process conditions. The deformation temperature is too low to fully activate all the slip systems of the magnesium matrix, and the second phase of the alloy hinders the deformation significantly, and the phenomenon of "squeezing" appears. Because the melting point of zinc is low, it can be found in the alloy structure that the eutectic composition segregation between dendrite arms is relatively serious. Therefore, if the deformation temperature is too high, the alloy is prone to overheating and overburning during hot processing, and the surface quality of the extruded material is poo...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/02B22D21/04
Inventor 陶卫建
Owner NANJING YUNHAI SPECIAL METALS CO LTD
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