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Creep resistance magnesium alloy and manufacture method thereof

A magnesium alloy and anti-creep technology, which is applied in the fields of magnesium alloy and its preparation, creep-resistant magnesium alloy and its preparation, can solve the problem of high-temperature creep resistance performance description of alloys, inability to give full play to aging strengthening, and unfavorable high-temperature performance of magnesium alloys etc. to achieve the effects of light weight, excellent high temperature strength and creep resistance, and acceptable cost

Active Publication Date: 2010-03-24
JIANGSU FAVOUR AUTOMOTIVE NEW STUFF SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In existing alloys of this type, heavy rare earth elements are mostly used as RE elements, such as Y, Gd, Dy, Er, Ho, etc., and too high Zn content will affect the solid solution effect, so that the aging strengthening effect cannot be fully exerted. , which is undoubtedly not conducive to the improvement of the high-temperature performance of magnesium alloys and is contrary to the original design of lightweight design.
In addition, the above patent documents do not describe the high temperature creep resistance of the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Alloy composition (percentage by weight): 1% Sm, 0.2% Zn, 0.2% Y, 0.3% Zr, impurity elements are less than 0.02%, and the rest is Mg.

[0027] The specific steps of the melting process of the alloy are as follows: (1) configure the alloy according to the above components, add pure magnesium into the resistance crucible furnace, and use SF 6 and CO 2 Mixed gas for protection; (2) After the magnesium is completely melted, add industrial pure zinc at 680°C; (3) When the temperature of the magnesium liquid reaches 700°C, directly add the Mg-Sm master alloy into the magnesium liquid, Mg-Sm After melting, when the temperature of the molten magnesium rises to 720°C, add the Mg-Y master alloy; (4) After the temperature of the magnesium liquid rises to 760°C, add the Mg-Zr master alloy, and stir for 2 minutes to promote its full melting; (5) The temperature of the molten magnesium is 780°C, keep it warm for 20 minutes, then cool it down to 750°C, refine it continuously for 6 mi...

Embodiment 2

[0032] Alloy composition (percentage by weight): 6% Sm, 3% Zn, 1% Y, impurity elements are less than 0.02%, and the rest is Mg.

[0033] The specific steps of the melting process of the alloy are as follows: (1) configure the alloy according to the above components, add pure magnesium into the resistance crucible furnace, and use SF 6 and CO 2 Mixed gas for protection; (2) After the magnesium is completely melted, add industrial pure zinc at 700°C; (3) When the temperature of the magnesium liquid reaches 720°C, directly add the Mg-Sm master alloy into the magnesium liquid, Mg-Sm After melting, when the temperature of the molten magnesium rises to 740°C, add the Mg-Y master alloy; (4) Raise the temperature of the molten magnesium to 800°C, keep it warm for 20 minutes, then cool it down to 740°C, and refine it continuously for 10 minutes, and control the standing time after refining Between 40 minutes, after the molten magnesium is cooled to 720°C, skim off the surface scum and...

Embodiment 3

[0038] Alloy composition (percentage by weight): 6% Sm, 3% Zn, 1% Y, 0.5Zr, impurity elements are less than 0.02%, and the rest is Mg.

[0039] The specific steps of the melting process of the alloy are as follows: (1) configure the alloy according to the above components, add pure magnesium into the resistance crucible furnace, and use SF 6 and CO 2 Mixed gas for protection; (2) After the magnesium is completely melted, add industrial pure zinc at 700°C; (3) When the temperature of the magnesium liquid reaches 720°C, directly add the Mg-Sm master alloy into the magnesium liquid, Mg-Sm After melting, when the temperature of the molten magnesium rises to 740°C, add the Mg-Y master alloy; (4) After the temperature of the magnesium liquid rises to 780°C, add the Mg-Zr master alloy, and stir for 5 minutes to promote its full melting; (5) The temperature of the molten magnesium is 800°C, keep it warm for 20 minutes, then cool it down to 740°C, refine it continuously for 10 minutes...

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Abstract

The invention discloses a creep resistance creep resistance and the process for preparation, wherein each component and percentage by weight of creep resistance are that 1%<=Sm<=6%, 0.2%<=Zn<=3%, 0.2%<=Y<=1.5%, 0<=Zr<=0.9%, and others are magnesium and unavoidable impurities. The process for preparation comprises the following steps: firstly, smelting under the protection of SF6 and CO2 gas, respectively utilizing the form of intermediate alloy of Mg-Sm, Mg-Y and Mg-Zrr in magnesium melt, doing solid solution treatment for magnesium alloy which is got after melting for 6h-24h under 490 DEG C-540 DEG C, and getting excellent intensity, good plasticity and outstanding creep resistant property.

Description

technical field [0001] The invention relates to a magnesium alloy in the technical field of metal materials and a preparation method thereof, in particular to a creep-resistant magnesium alloy with high strength and good plasticity and a preparation method thereof. Background technique [0002] As the lightest metal structure material, magnesium alloy can meet the increasingly stringent requirements of automobile exhaust emission, and can produce new automobiles with light weight, low fuel consumption and environmental protection, so it has received extensive attention in the automobile industry. However, low high temperature strength and creep resistance restrict its application in engine and power system parts. Therefore, high-strength creep-resistant magnesium alloys have been proposed. [0003] Rare earth elements are considered to be important elements used to improve the heat resistance of magnesium alloys, such as Mg-Y-Nd-based alloys WE54 and WE43 that have been com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
Inventor 王渠东赵阳郑江
Owner JIANGSU FAVOUR AUTOMOTIVE NEW STUFF SCI TECH