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A kind of mg-zn-gd quasicrystal-reinforced az91 magnesium alloy and its preparation method

An AZ91 and magnesium alloy technology, applied in the field of AZ91 alloy and its preparation, can solve the problems of poor corrosion, low mechanical properties, coarse grains, etc., to increase the number of grains, elongation and corrosion resistance, crystal The effect of particle size reduction

Active Publication Date: 2017-06-23
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the disadvantages of the current as-cast AZ91 magnesium alloy, such as relatively coarse microstructure grains, low mechanical properties, poor corrosion resistance, etc., and provides a Mg-Zn-Gd quasicrystalline reinforced AZ91 magnesium alloy to obtain a second phase with uniform composition, The strength, plasticity and corrosion resistance of the alloy are improved, and the overall performance of the alloy is significantly improved to meet the growing demand for magnesium alloys

Method used

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  • A kind of mg-zn-gd quasicrystal-reinforced az91 magnesium alloy and its preparation method
  • A kind of mg-zn-gd quasicrystal-reinforced az91 magnesium alloy and its preparation method
  • A kind of mg-zn-gd quasicrystal-reinforced az91 magnesium alloy and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A Mg-Zn-Gd quasicrystalline phase reinforced AZ91 magnesium alloy is characterized in that it has the following mass percentages: Al8.82, Zn 1.90%, Gd 0.29%, and the balance is Mg.

[0031] Take the following steps to make:

[0032] 1) Preparation of Mg-Zn-Gd quasicrystalline master alloy:

[0033] Prepare magnesium ingots, zinc ingots and Mg-Gd intermediate alloys according to the ratio as raw materials, raise the furnace temperature to 680°C, put the magnesium ingots into the graphite crucible, and then put the graphite crucible into the SF 6 -CO 2 In the resistance furnace of mixed gas, add Mg-Gd intermediate alloy after the magnesium ingot is melted, and finally add zinc ingot after the Mg-Gd intermediate alloy is melted, keep warm for 15 minutes after the zinc is melted, then slowly shake the graphite crucible for 1 minute, and put it into the furnace Stand still for 2 minutes, pour into metal molds to obtain Mg-Zn-Gd quasicrystalline alloy with uniform compositi...

Embodiment 2

[0040] A Mg-Zn-Gd quasicrystalline phase reinforced AZ91 magnesium alloy is characterized in that it has the following mass percentages: Al 8.65%, Zn 2.76%, Gd 0.58%, and the balance is Mg.

[0041] Take the following steps to make:

[0042] 1) Preparation of Mg-Zn-Gd quasicrystalline master alloy:

[0043] Prepare magnesium ingots, zinc ingots and Mg-Gd intermediate alloys according to the ratio as raw materials, raise the furnace temperature to 700°C, put the magnesium ingots into the graphite crucible, and then put the graphite crucible into the SF 6- CO 2 In the mixed gas resistance furnace, after the magnesium ingot is melted, add the Mg-Gd master alloy, and finally add the zinc ingot after the Mg-Gd master alloy is melted. Stand in the middle for 2.25min, and pour it into a metal mold to obtain a Mg-Zn-Gd quasicrystal alloy with uniform composition;

[0044] 2) Preparation of AZ91 magnesium alloy:

[0045] Using 8.82% Al by mass, 0.89% Zn and 90.29% Mg as raw materials...

Embodiment 3

[0050] A Mg-Zn-Gd quasicrystalline phase reinforced AZ91 magnesium alloy is characterized in that it has the following mass percentages: Al 8.49%, Zn 3.59%, Gd 0.86%, and the balance is Mg.

[0051] Take the following steps to make:

[0052] 1) Preparation of Mg-Zn-Gd quasicrystalline master alloy:

[0053] Prepare magnesium ingots, zinc ingots and Mg-Gd intermediate alloys according to the ratio as raw materials, raise the furnace temperature to 720°C, put the magnesium ingots into the graphite crucible, and then put the graphite crucible into the SF 6 -CO 2 In the mixed gas resistance furnace, add Mg-Gd master alloy after the magnesium ingot is melted, and finally add zinc ingot after the Mg-Gd master alloy is melted, keep warm for 20 minutes after the zinc is melted, then slowly shake the graphite crucible for 1.5 minutes, put it into the Stand in the middle for 2.5min, pour into the metal mold, obtain the Mg-Zn-Gd quasicrystal alloy with uniform composition;

[0054] 2)...

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Abstract

The invention relates to Mg-Zn-Gd quasi-crystal strengthened AZ91 magnesium alloy. The Mg-Zn-Gd quasi-crystal strengthened AZ91 magnesium alloy is characterized by comprising, by mass, 8.18-8.82% of Al, 1.90-5.16% of Zn, 0.29-1.36% of Gd and the balance Mg. The Mg-Zn-Gd quasi-crystal alloy clear in tissue and even in component is obtained; quasi-crystal intermediate alloy is added to traditional AZ91 alloy; the AZ91 alloy and the quasi-crystal intermediate alloy with the mass percent of 2%-10% are smelted at the same time through reasonable technology means; and then the Mg-Zn-Gd quasi-crystal strengthened AZ91 magnesium alloy is obtained. The specific strength and the specific rigidity of the magnesium alloy are ensured, meanwhile, strength, plasticity and corrosion resistance of the alloy are remarkably improved, and good comprehensive performance is obtained. The AZ91 alloy prepared through the method can be more widely applied to the fields of rail transit, automobiles, electronics, communication and the like.

Description

technical field [0001] The invention belongs to the field of magnesium alloy preparation, and in particular relates to a Mg-Zn-Gd quasicrystal-reinforced AZ91 alloy and a preparation method thereof. Background technique [0002] In the current actual production of magnesium alloys, the AZ91 alloy is currently the most widely used cast magnesium alloy. The Mg-Zn-RE quasicrystal alloy is added as an intermediate alloy to commercial magnesium alloys such as AZ91, which can be used without changing the alloy. Under the condition of the basic composition phase, the unique characteristics of low interface energy, remelting, corrosion resistance, high strength and high hardness of quasicrystalline particles are used as an intermediate alloy to add to AZ91 as-cast magnesium alloy to improve the mechanical properties of the alloy and corrosion resistance properties. [0003] At present, Al-Cu-Fe quasicrystal reinforced AZ91 magnesium alloy is widely used. Although it can improve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03
Inventor 滕新营张金洋许敏
Owner UNIV OF JINAN
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