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A heat-resistant and creep-resistant magnesium alloy and its preparation method

A magnesium alloy and anti-creep technology, which is applied in the field of metallurgy, can solve the problems of failure to meet the requirements of creep resistance performance, decrease of creep resistance performance, and limit applications, etc., and achieve the effect of superior high-temperature creep performance

Active Publication Date: 2020-09-04
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this system of magnesium alloys is that the cost is low, but the high temperature resistant second phase Mg in this system of magnesium alloys 17 Al 12 When the temperature is higher than 175°C, it will decompose, so that the creep resistance of the system magnesium alloy will decrease sharply when the temperature is higher than 175°C, so that it cannot meet the high temperature creep resistance performance requirements. This performance defect greatly limits Mg- Application of Al Series Magnesium Alloys in Aeronautics and Automobiles

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  • A heat-resistant and creep-resistant magnesium alloy and its preparation method
  • A heat-resistant and creep-resistant magnesium alloy and its preparation method

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preparation example Construction

[0026] The preparation method of the heat-resistant high-strength deformed magnesium alloy of the present invention comprises the following steps:

[0027] (1) Raise the temperature of pure magnesium to 160-250°C, keep it warm for 5-15 minutes, and then melt the pure magnesium under the protection of protective gas or flame-retardant covering;

[0028] (2) Raise the temperature of pure magnesium melt to 650-800°C, raise the temperature of magnesium-scandium alloy, magnesium-tin alloy, magnesium-strontium alloy, magnesium-manganese alloy and magnesium-calcium alloy to 160-250°C, keep it warm for 5-15 minutes, and separate Added to pure magnesium melt to melt the added alloy and magnesium to make alloy melt;

[0029] (3) Skim off the scum on the surface of the melt, stir for 3-30 minutes, then raise the temperature to 750--800°C and let stand for 20-100 minutes;

[0030] (4) cooling to the casting temperature for casting to prepare a Mg-Sn-Sr-Ca-Sc-Mn alloy ingot, the casting p...

Embodiment 1

[0036] (1) Raise the temperature of pure magnesium to 160°C, keep it warm for 15 minutes, and then in SF 6 +CO 2 Melting pure magnesium under the protection of protective gas;

[0037] (2) Pure magnesium molten liquid is heated up to 650 ℃, magnesium-tin alloy (the final weight percent content of tin element is 3%), magnesium-strontium alloy (the final weight percent content of strontium element is 2%), magnesium-calcium alloy ( The final weight percentage content of calcium element is 1%), magnesium-scandium alloy (the final weight percentage content of scandium element is 1%) and magnesium-manganese alloy (the final weight percentage content of manganese element is 1%). Minutes, and added to the pure magnesium melt respectively to melt the added alloy and magnesium to make alloy melt;

[0038] (3) Skim off the scum on the surface of the melt, stir for 15 minutes, then raise the temperature to 750°C and let stand for 60 minutes;

[0039](4) cooling to the casting temperatu...

Embodiment 2

[0043] (1) Raise the temperature of pure magnesium to 180°C, keep it warm for 13 minutes, and then in SF 6 +CO 2 Melting pure magnesium under the protection of protective gas;

[0044] (2) Pure magnesium molten liquid is heated up to 670 ℃, and magnesium-tin alloy (the final weight percent content of tin element is 4%), magnesium-strontium alloy (the final weight percent content of strontium element is 3%), magnesium-calcium alloy ( The final weight percentage content of calcium element is 1%), magnesium-scandium alloy (the final weight percentage content of scandium element is 0.5%) and magnesium-manganese alloy (the final weight percentage content of manganese element is 0.5%) is heated up to 180 ℃, insulation 13 Minutes, and added to the pure magnesium melt respectively to melt the added alloy and magnesium to make alloy melt;

[0045] (3) Skim off the scum on the surface of the melt, stir for 10 minutes, then raise the temperature to 800°C and let stand for 35 minutes; ...

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Abstract

The invention relates to the technical field of metallurgy, in particular to heat-resistant and creep-resistant magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following alloy elements in percent by weight: 3 to 6 percent of tin, 2 to 5 percent of strontium, 0.4 to 2 percent of calcium, 0.1 to 1 percent of scandium, 0.1 to 1 percent of manganese and comprises the balance of magnesium, wherein the total content of the alloy elements is less than or equal to 10 percent. The preparation method comprises the following steps: preheating and melting pure magnesium, adding Mg-Sn, Mg-Sr, Mg-Ca, Mg-Mn and Mg-Sc intermediate alloy separately, refining after the added metal is melted, preparing a blank by using the refined alloy solution and by a casting method, and performing rolling or forging and pressing or extrusion or composite deformation on the pretreated continuous casting blank to prepare the heat-resistant and creep-resistant magnesium alloy with lowcost. The magnesium alloy can serve for a long time under the use condition of 250 to 300 DEG C and can meet the requirements on weight reduction by the industries such as aerospace, military industry and automobile; furthermore, the added components are the common alloy elements, the manufacturing cost is low and the heat-resistant and creep-resistant magnesium alloy is suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a heat-resistant and creep-resistant magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is an alloy composed of magnesium and other elements. Its characteristics are: low density (1.8g / cm 3 About), high specific strength, large elastic modulus, easy to recycle, good shock absorption, and the content of magnesium alloy on the earth is extremely rich. Under the dual pressure of the world's petrochemical energy crisis and environmental pollution, in order to achieve the effect of energy saving and emission reduction, countries around the world have put forward weight reduction requirements for the fields of automobiles and aviation. The density of magnesium alloy is only two-thirds of that of aluminum alloy, and the density of steel quarter, thus having important application potential in the aforementioned fields. [0003] Although ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/06
CPCC22C1/03C22C23/00C22F1/06
Inventor 郑兴伟褚振华许竞翔王世明张丽珍梁拥成
Owner SHANGHAI OCEAN UNIV