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Method for preparing nano quasi-crystal reinforced Mg-Zn-Y alloy by means of equal channel angular pressing

A technology of equal-diameter angular extrusion and alloying, which is applied in the field of magnesium alloy manufacturing, can solve the problems of less research, increase the cost of alloys, and reduce the elongation of alloys, and achieve the effect of expanding the scope of industrial applications and improving comprehensive mechanical properties.

Active Publication Date: 2018-03-20
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 by means of equal channel angular pressing

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Experimental program
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Effect test

Embodiment 1

[0037] A method for preparing nano-quasicrystal reinforced Mg-Zn-Y alloy by equal angular 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: 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 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 740°C, stir for 4min, then refine and stand for 8min, until the temperature drops to 720°C ℃, pouring, that is, cast Mg-Zn-Y alloy.

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

[0040] C. The annea...

Embodiment 2

[0045] A method for preparing nano-quasicrystal reinforced Mg-Zn-Y alloy by equal angular extrusion, the steps are as follows:

[0046] 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.

[0047] B. Anneal the cast Mg-Zn-Y alloy prepared in step A at 400°C for 12h, and cool with the furnace.

[0048] C. The annealed Mg-Zn-...

Embodiment 3

[0053] A method for preparing nano-quasicrystal reinforced Mg-Zn-Y alloy by equal angular extrusion, the steps are as follows:

[0054] 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.

[0055] B. Anneal the cast Mg-Zn-Y alloy prepared in step A at 400°C for 12h, and cool with the furnace.

[0056] C. The annealed Mg-Zn-Y a...

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Abstract

The invention discloses a method for preparing nano quasi-crystal reinforced Mg-Zn-Y alloy by means of equal channel angular pressing. The method includes the following steps that A, cast-state Mg-Zn-Y alloy is prepared according to the set atomic percentage composition ratio of all components and comprises 0.5%-6% of Zn, 0.08%-1.2% of Y and the balance Mg based on the set atomic percentage composition of all the components, and the atomic percentage composition specific value of the Zn to the Y is 5-7:1; B, the cast-state Mg-Zn-Y alloy is annealed for 8-20h at the temperature of 380-420 DEG C, and furnace cooling is conducted; C, the annealed Mg-Zn-Y alloy is subjected to hot extrusion after heat preservation lasts for 2-4h at the temperature of 300-400 DEG C, the extrusion temperature is300-400 DEG C, and the extrusion ratio is 9-60:1; D, the Mg-Zn-Y alloy processed through hot extrusion in the step C is put into a thermal treatment furnace, the furnace temperature rises to 540-600DEG C, heat preservation lasts for 5-20min, and quenching is performed; and E, the Mg-Zn-Y alloy obtained in the step D is subjected to equal channel angular pressing after heat preservation lasts for2-4h at the temperature of 180-330 DEG C, and accordingly the nano quasi-crystal reinforced Mg-Zn-Y alloy can be obtained. By adoption of the method, the high-performance magnesium alloy with good yield strength, tensile 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 equal-diameter angular extrusion, which belongs to the field of magnesium alloy manufacturing. 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...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22F1/06C22C1/03
CPCC22C1/03C22C23/04C22F1/002C22F1/06
Inventor 张英波曾崎李康宁
Owner SOUTHWEST JIAOTONG UNIV
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