Method for preparing nano quasi-crystal reinforced Mg-Zn-Y alloy through reciprocation extrusion

A reciprocating extrusion and alloying technology, applied in the field of magnesium alloy manufacturing, can solve the problems of less research, increased alloy cost, and difficulty in further refining the quasicrystal I-phase particle size, so as to expand the scope of industrial applications and improve comprehensive Mechanical properties, the effect of eliminating various defects

Active Publication Date: 2018-03-09
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] At present, the quasicrystalline I-phase particles in the quasicrystalline reinforced Mg-Zn-Y alloy are mostly micron-sized, but there are few studies on the nanoscale quasicrystalline phase particle-reinforced Mg-Zn-Y alloy, and it is difficult to further fine-tune the existing technology. Optimize the size of the quasicrystal I-phase particles
In order to obtain quasicrystalline reinforced Mg-Zn-Y alloys with excellent mechanical properties, existing methods can increase the content of quasicrystalline I-phase in Mg-Zn-Y alloys by increasing the content of Zn and Y, but increasing the content of Zn and Y It will lead to a decrease in the elongation of the alloy and will significantly increase the cost of the alloy

Method used

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  • Method for preparing nano quasi-crystal reinforced Mg-Zn-Y alloy through reciprocation extrusion

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Embodiment 1

[0037] A method for preparing nano-quasicrystal reinforced Mg-Zn-Y alloy by reciprocating extrusion, the steps are as follows:

[0038] A. Prepare the cast Mg-Zn-Y alloy according to the set atomic percentage ratio of each constituent element; the set atomic percentages of each constituent element are: 1.5% Zn, 0.25% Y , the rest is Mg; the specific operation of preparing the cast Mg-Zn-Y alloy is: according to the set atomic percentage ratio of each constituent element, pure Mg is placed in a crucible and heated, when heated to 340 ° C into CO 2 +SF 6 Mix the protective gas, after the pure Mg is completely melted, place the pure Zn and Mg-Y master alloy in the pure Mg melt respectively, continue to heat to 720°C, stir for 5min, then refine and stand for 10min, until the temperature drops to 710°C ℃, pouring, that is, cast Mg-Zn-Y alloy.

[0039] B. Anneal the cast Mg-Zn-Y alloy prepared in step A at 400°C for 12h, and cool with the furnace.

[0040] C. The annealed Mg-Zn-...

Embodiment 2

[0046] A method for preparing nano-quasicrystal reinforced Mg-Zn-Y alloy by reciprocating extrusion, the steps are as follows:

[0047] A. Prepare the cast Mg-Zn-Y alloy according to the set atomic percentage ratio of each constituent element; the set atomic percentages of each constituent element are: 1.5% Zn, 0.25% Y , the rest is Mg; the specific operation of preparing the cast Mg-Zn-Y alloy is: according to the set atomic percentage ratio of each constituent element, pure Mg is placed in a crucible and heated, when heated to 360 ° C into CO 2 +SF 6 Mix the protective gas, after the pure Mg is completely melted, put the pure Zn and Mg-Y master alloy in the pure Mg melt respectively, continue heating to 760°C, stir for 2min, then refine and stand for 5min, until the temperature drops to 740°C ℃, pouring, that is, cast Mg-Zn-Y alloy.

[0048] B. Anneal the cast Mg-Zn-Y alloy prepared in step A at 400°C for 12h, and cool with the furnace.

[0049] C. After the annealed Mg-...

Embodiment 3

[0054] A method for preparing nano-quasicrystal reinforced Mg-Zn-Y alloy by reciprocating extrusion, the steps are as follows:

[0055] A. Prepare the cast Mg-Zn-Y alloy according to the set atomic percentage ratio of each constituent element; the set atomic percentages of each constituent element are: 3% Zn, 0.5% Y , and the rest is Mg; the specific operation of preparing the cast Mg-Zn-Y alloy is: according to the set atomic percentage ratio of each constituent element, pure Mg is placed in a crucible and heated, when heated to 350 ° C into CO 2 +SF 6 Mix protective gas, after pure Mg is completely melted, place pure Zn and Mg-Y master alloy in pure Mg melt respectively, continue to heat to 740°C, stir for 3min, then refine and stand for 8min, wait until the temperature drops to 720°C ℃, pouring, that is, cast Mg-Zn-Y alloy.

[0056] B. Anneal the cast Mg-Zn-Y alloy prepared in step A at 400°C for 12h, and cool with the furnace.

[0057] C. The annealed Mg-Zn-Y alloy obt...

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Abstract

The invention discloses a method for preparing a nano quasi-crystal reinforced Mg-Zn-Y alloy through reciprocation extrusion. The method comprises the following steps: A, preparing cast Mg-Zn-Y alloyaccording to atom percentages of set component elements as follows: 0.5-6% of Zn, 0.08-1.2% of Y and the balance of Mg, and the content ratio of atoms of Zn and Y is (5-7):1; B, annealing the cast Mg-Zn-Y alloy for 8-20 hours at 380-420 DEG C, and performing furnace cooling; C, keeping the temperature of the annealed Mg-Zn-Y alloy at 300-400 DEG C for 2-4 hours, and performing thermal extrusion, wherein the extrusion temperature is 300-400 DEG C, and the extrusion ratio is (9-60):1; D, putting the Mg-Zn-Y alloy after thermal extrusion processing in the step C into a thermal treatment furnace,heating to 540-600 DEG C, keeping the temperature for 5-20 minutes, and performing quenching; and E, keeping the temperature of the Mg-Zn-Y alloy obtained in the step D at 200-380 DEG C for 2-4 hours,and performing reciprocation extrusion, thereby obtaining the alloy. By adopting the method, a magnesium alloy which is excellent in yield strength, tension strength and ductility can be prepared.

Description

technical field [0001] The invention relates to a method for preparing nano-quasicrystal reinforced Mg-Zn-Y alloy by reciprocating extrusion, which belongs to the field of magnesium alloy manufacture. Background technique [0002] As the lightest metal structural material, magnesium alloy has the advantages of high specific strength, good noise reduction and vibration reduction, good electromagnetic shielding, and easy recycling. It is used in transportation vehicles, aerospace, electronic communications, national defense technology and other fields. It has a very broad application prospect. Especially with the increasing requirements for the lightweight, energy saving, environmental protection and ecological environment of transportation equipment, the application of magnesium alloys in the field of transportation equipment has attracted more and more attention. However, magnesium alloys have their own shortcomings, such as low strength and poor toughness, which limit the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/03B21C31/00B21C27/00C22C23/04C22F1/06
CPCB21C23/03B21C27/00B21C31/00C22C23/04C22F1/06
Inventor 张英波曾崎李康宁
Owner SOUTHWEST JIAOTONG UNIV
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