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Rare-earth and Zr reinforced Mg-Li based wrought magnesium alloy and preparation method thereof

A deformed magnesium alloy, mg-li technology, applied in the field of metal materials and metallurgy, can solve the problems of Li removal, easy oxidation, complex smelting process, etc., and achieve the effect of good plastic deformation ability

Active Publication Date: 2013-03-20
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alloy also has key problems such as low absolute strength, extremely poor corrosion resistance, complex melting process, easy oxidation and de-lithiation during heat treatment, which greatly restrict the development and application of Mg-Li-based magnesium alloys.

Method used

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  • Rare-earth and Zr reinforced Mg-Li based wrought magnesium alloy and preparation method thereof
  • Rare-earth and Zr reinforced Mg-Li based wrought magnesium alloy and preparation method thereof
  • Rare-earth and Zr reinforced Mg-Li based wrought magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Use a resistance melting furnace to heat the metal magnesium to 720°C and melt it, use No. 5 flux to purify the metal magnesium melt, heat the melt to 780°C after stirring, add Mg-Gd containing 1%Gd in the middle Alloy and Mg-Zr master alloy containing 0.4% Zr, when the melt temperature drops to 660°C, add 3% Li with a lithium cover, and stir vertically for 4min below the depth of 2 / 3 of the melt, then raise the temperature to 720°C, The melt was allowed to stand for 30 minutes;

[0036] (2) The above melting and casting process utilizes the volume ratio of CO 2 :SF 6 =20:1 mixed gas protection to prevent combustion, cast the metal liquid into an iron crucible preheated to 200°C to obtain an ingot, chemical analysis shows that the composition of the ingot is Mg-3.03Li-1.16Gd-0.37Zr ;

[0037] (3) Wrap the alloy ingot with 0.1mm thick aluminum foil in double layers, and squeeze out the air in the gap between the aluminum foil and the ingot, so that the aluminum fo...

Embodiment 2

[0045] (1) Using a resistance melting furnace, heat the magnesium metal to 730°C to melt, and use the No. 5 flux to purify the metal magnesium melt, heat the melt to 780°C after stirring, and add Mg-La containing 1% La in the middle Alloy and Mg-Zr master alloy containing 0.4% Zr, when the melt temperature drops to 660°C, add 1.5% Li with a lithium cover, and stir vertically for 3 minutes below the depth of 2 / 3 of the melt, then raise the temperature to 720°C, The melt was allowed to stand for 30 minutes;

[0046] (2) The above melting and casting process utilizes the volume ratio of CO 2 :SF 6 =20:1 mixed gas protection to prevent combustion, cast the metal liquid into an iron crucible preheated to 200°C to obtain an ingot, chemical analysis shows that the composition of the ingot is Mg-1.53Li-0.71La-0.35Zr ;

[0047] (3) Wrap the alloy ingot with 0.1mm thick aluminum foil in double layers, and squeeze out the air in the gap between the aluminum foil and the ingot, so that...

Embodiment 3

[0055] (1) Use a resistance melting furnace to heat the metal magnesium to 730°C to melt, use No. 5 flux to purify the metal magnesium melt, heat the melt to 780°C after stirring, add Mg-Nd containing 1% Nd in the middle Alloy and Mg-Zr master alloy containing 0.2% Zr, when the melt temperature drops to 670°C, add 4% Li with a lithium cover, and stir vertically for 4min below the depth of 2 / 3 of the melt, then raise the temperature to 720°C, The melt was allowed to stand for 30 minutes;

[0056] (2) The above melting and casting process utilizes the volume ratio of CO 2 :SF 6 =20:1 mixed gas protection to prevent combustion, cast the metal liquid into an iron crucible preheated to 200°C to obtain an ingot, chemical analysis shows that the composition of the ingot is Mg-4.05Li-1.11Nd-0.21Zr ;

[0057] (3) Wrap the alloy ingot with 0.1mm thick aluminum foil in double layers, and squeeze out the air in the gap between the aluminum foil and the ingot, so that the aluminum foil ...

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Abstract

The invention belongs to the technical field of metal materials and metallurgy, and particularly relates to a rare-earth and Zr reinforced Mg-Li based wrought magnesium alloy and a preparation method thereof. The magnesium alloy adopts Mg-Li based magnesium alloy as the basis; the rare elements and Zr are adopted to be used as the alloying elements; and the Mg-Li based wrought magnesium alloy comprises the following components in percentage by weight: 1.5 to 5.5% of Li, 1% of rare earth element, 0.2 to 0.6% of Zr, and the balance of Mg. The preparation method comprises the following steps in sequence: melting the alloy; casting to an iron crucible which is pre-heated to reach 200 DEG C, thus obtaining an ingot casting; transferring the ingot casting wrapped by the aluminum foil into an iron container; completely covering the ingot casting by fine sand; placing the container into a heat treatment furnace for heat treating; turning; processing into an alloy bar of Phi 46mm; processing the alloy bar by a reverse extruding device so as to obtain a magnesium alloy extruding bar; and carrying out T6 heat treatment on the bar. By adopting the preparation method, the performances of the Mg-Li alloy can be reinforced, and the high plastic deformation capacity of the Mg-Li alloy can be remained; and the tensile mechanical properties of the Mg-Li alloy at room temperature can reach the following levels: the tensile strength Rm is 210MPa, the yield strength Rp 0.2 is 142MPa, and the elongation percentage A is of 23.5%.

Description

[0001] technical field [0002] The invention belongs to the technical field of metal materials and metallurgy, and in particular relates to a Mg-Li-based deformed magnesium alloy strengthened by rare earth and Zr and a preparation method thereof. Background technique [0003] Magnesium alloy has the advantages of low density, high specific strength, excellent vibration damping, electromagnetic shielding and machinability, and is an ideal material for lightweight structures. In recent years, the research and application of magnesium alloys have been highly valued. Among them, as an important system in magnesium alloys, Mg-Li-based magnesium alloys are currently the lightest alloys and one of the most potential alloy systems for the development of ultra-light and high-strength alloys. Compared with other magnesium alloys, Mg-Li-based magnesium alloys usually exhibit very good plastic deformation ability, because as the Li content increases, the alloy phase structure of the al...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/03C22F1/06
Inventor 宝磊张志强乐启炽崔建忠
Owner NORTHEASTERN UNIV
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