CN105331866B - Enhanced AZ91 magnesium alloys of a kind of Mg Zn Gd quasi-crystalline substances and preparation method thereof - Google Patents
Enhanced AZ91 magnesium alloys of a kind of Mg Zn Gd quasi-crystalline substances and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of Mg Zn Gd Icosahedral phases enhancing AZ91 magnesium alloys, it is characterised in that weight/mass percentage composition is：Al 8.18 ~ 8.82, Zn 1.90 ~ 5.16%, Gd 0.29 ~ 1.36%, balance of Mg.The present invention is first obtained and organizes clear and definite, the uniform Mg Zn Gd quasicrystalline alloy of composition, quasi-crystalline substance intermediate alloy is added to traditional AZ91 alloys again, by rational process meanses, it is the melting simultaneously of 2% ~ 10% quasi-crystalline substance intermediate alloy by AZ91 and mass percent, obtains Mg Zn Gd Icosahedral phases enhancing AZ91 magnesium alloys.While ensure that the high specific strength and specific stiffness of magnesium alloy so that the intensity and plasticity and decay resistance of alloy are significantly improved, good combination property is obtained.The AZ91 alloys that the present invention is prepared will further improve it and are widely used in fields such as track traffic, automobile, electronics and communications.
Description
Technical field
The invention belongs to magnesium alloy preparation field, and in particular to a kind of enhanced AZ91 alloys of Mg-Zn-Gd quasi-crystalline substances and its system
Preparation Method.
Background technology
In the actual production of current magnesium alloy, AZ91 alloys are a kind of current most popular cast magnesium alloys, will
Mg-Zn-RE quasicrystalline alloy is added in the business magnesium alloy such as AZ91 as intermediate alloy, can not change basic group of alloy
Into under conditions of phase, the features such as using quasicrystal particle exclusive low interface energy, remelting, corrosion resistant performance, high strength and high hardness, make
For intermediate alloy is added in AZ91 as-cast magnesium alloys, the mechanical property and rotproofness performance of alloy are improved.
At present, widely used Al-Cu-Fe quasi-crystalline substances enhancing AZ91 magnesium alloys.Although the intensity of alloy can be improved,
It is inevitably to bring some metal impurities.The Chinese patent of Application No. 200610026842.X reports a kind of spontaneous standard
The preparation method of brilliant enhanced high-ductility wrought magnesium alloy, obtains tensile strength magnesium alloy plate very high.
Research shows, icosahedral quasicrystal（I phases）With high rigidity, good thermodynamic stability, low-friction coefficient, low
Interface can and it is anti-corrosion the features such as and the good associativity with magnesium matrix.
The content of the invention
The present invention for current As-Cast AZ 91 Magnesium Alloy tissue crystal grain it is thicker, mechanical property is not high, corrosivity compared with
The shortcomings of difference, there is provided a kind of Mg-Zn-Gd quasi-crystalline substances enhancing AZ91 magnesium alloys obtain uniform second phase of composition, improve alloy
Intensity and plasticity and corrosion resistance so that the combination property of alloy is significantly improved, meet growing magnesium alloy demand.
Present invention simultaneously provides the preparation method that appeal Mg-Zn-Gd quasi-crystalline substances strengthen AZ91 magnesium alloy materials.In traditional as cast condition
On the basis of AZ91, it is 2 ~ 8% Mg-Zn-Gd quasi-crystalline substance intermediate alloys to add mass fraction, and the enhancing of Mg-Zn-Gd quasi-crystalline substances is obtained
AZ91 magnesium alloy methods are simple to operation.
The present invention is realized by the following method：
A kind of Mg-Zn-Gd Icosahedral phases strengthen AZ91 magnesium alloys, it is characterised in that have the following weight/mass percentage composition to be：Al
8.33 ~ 8.82, Zn 1.90 ~ 4.39%, Gd 0.29 ~ 1.11%, balance of Mg；Described Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium
The microscopic appearance of alloy is：Discontinuous netted Mg17Al12Coexisted with a small amount of graininess icosahedral quasicrystal；The magnesium
Matrix is α-Mg；Described Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys are：The volume fraction of the second phase be 12.42 ~
20.84%；Average dendrite length is 13.45 ~ 72.61 μm；Described second mutually include, discontinuous netted Mg17Al12With
A small amount of graininess icosahedral quasicrystal；Described dendrite length is the average dendrite length of the second phase.
A kind of preparation method of Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys is as follows：Prepare and closed in the middle of Mg-Zn-Gd quasi-crystalline substances
Gold；Melting AZ91 magnesium alloys, then by Mg-Zn-Gd quasi-crystalline substances intermediate alloy and the insulation of AZ91 magnesium alloy smeltings after, it is suitable to be cast in
The uniform Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys of composition are obtained in mould.
Described Mg-Zn-Gd quasi-crystalline substance intermediate alloys, its composition is by weight/mass percentage composition：46.12 ~ 46.95%Zn,
14.85 ~ 15.02%Mg-Gd, balance of Mg.
Mg-Zn-Gd Icosahedral phases of the invention strengthen the preparation method of AZ91 magnesium alloys, comprise the following steps：
1）Prepare Mg-Zn-Gd quasi-crystalline substance intermediate alloys：
Magnesium ingot, zinc ingot metal and Mg-Gd intermediate alloys are got out for raw material by proportioning, furnace temperature are risen to 680 ~ 720 DEG C, magnesium ingot
Be put into graphite crucible, then graphite crucible is put into full of SF6-CO2In the resistance furnace of mixed gas, after after magnesium ingot fusing
Mg-Gd intermediate alloys are added, finally zinc ingot metal is added after the fusing of Mg-Gd intermediate alloys, after 15 ~ 30min of insulation after the fusing of zinc material,
Then 1 ~ 2min of graphite crucible is slowly rocked, 2 ~ 3min of standing in stove is put into, is poured into metal type dies, obtain composition uniform
Mg-Zn-Gd quasicrystalline alloy；
2）Prepare AZ91 magnesium alloys：
It is 8.78~8.95%Al, 0.83~0.96%Zn and 90.09~90.39%Mg for raw material with weight/mass percentage composition, plus
Heat fusing is simultaneously warming up to 715~720 DEG C, casting metal type after stirring, and AZ91 magnesium alloys are obtained, and is passed through in fusion process
SF6-CO2 is mixed gas protected, obtains AZ91 magnesium alloys；
3）Prepare Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys：
Step 1 is taken by proportioning）The Mg-Zn-Gd quasi-crystalline substances intermediate alloy and step 2 of preparation）The AZ91 magnesium alloys of preparation,
SF6-CO2Under mixed gas protected, AZ91 magnesium alloys be put into and be preheating in 680~700 DEG C of container, then heat to 710~
740 DEG C, after AZ91 magnesium alloys are completely melt, Mg-Zn-Gd quasi-crystalline substance intermediate alloys are added in melt AZ91, treat Mg-Zn-
After the fusing of Gd quasi-crystalline substances intermediate alloy, 20-30min is incubated, stirs 1~2min, stand 5~10min, be then poured into liquation pre-
In hot 200-300 DEG C of punching block, the enhanced AZ91 magnesium alloys of Mg-Zn-Gd Icosahedral phases are obtained.
Described, step 1）The mass percent of middle raw material pure zinc ingot, Mg-Gd intermediate alloys and pure magnesium ingot is：46.12~
46.95%Zn, 14.85 ~ 15.02%Mg-Gd, balance of pure magnesium ingot；Described, step 2）Obtain the mass percent of AZ91 compositions
For：8.78~8.95%Al, 0.83~0.96%Zn, balance of Mg；Described, step 3) in, Mg-Zn-Gd quasicrystalline alloy plus
Enter the 2.00~10.00% of amount AZ91 material qualities.
The features of the present invention and beneficial effect are：
(1) there is the Mg-Zn-Gd Icosahedral phases in the present invention quasi periodic to arrange, and melt inside has elementide, energy
Enough for alloy provides hardening constituent, crystal grain thinning.Significantly improve the mechanical property and decay resistance of alloy；
(2) present invention prepares Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium and closes by optimizing preparation technology and component proportion
Gold, Mg-Zn-Gd quasi-crystalline substances have remelting, and elementide is internally formed in AZ91 magnesium alloys, for alloy provides more cores,
Increase the crystal grain quantity of AZ91, because the interface of Icosahedral phases can be smaller, therefore crystallite dimension is obviously reduced；
(3) intensity of the Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys obtained by the present invention, hardness, elongation percentage and corrosion resistant
Corrosion is significantly improved.
Brief description of the drawings
Fig. 1 is the micro-organization chart a and partial enlarged drawing b of Mg-Zn-Gd quasicrystalline alloy prepared by embodiment 3.
Fig. 2 is the micro-organization chart that Mg-Zn-Gd Icosahedral phases prepared by embodiment 3 strengthen AZ91 magnesium alloys.
Fig. 3 is the micro-organization chart of AZ91 magnesium alloys prepared by comparative example.
Fig. 4 is the microscopic appearance sign of embodiment and comparative example.
Fig. 5 is the room-temperature mechanical property of embodiment and comparative example.
Specific embodiment
Mg-Zn-Gd quasicrystalline alloy of the present invention and preparation method thereof is done furtherly below by embodiment and comparative example
It is bright.
Embodiment 1
A kind of Mg-Zn-Gd Icosahedral phases strengthen AZ91 magnesium alloys, it is characterised in that have the following weight/mass percentage composition to be：Al
8.82, Zn 1.90%, Gd 0.29%, balance of Mg.
Following steps are taken to be obtained：
1）Prepare Mg-Zn-Gd quasi-crystalline substance intermediate alloys：
Magnesium ingot, zinc ingot metal and Mg-Gd intermediate alloys are got out for raw material by proportioning, furnace temperature are risen to 680 DEG C, putting for magnesium ingot
Enter in graphite crucible, then graphite crucible is put into full of SF6-CO2In the resistance furnace of mixed gas, added after after magnesium ingot fusing
Mg-Gd intermediate alloys, finally add zinc ingot metal after the fusing of Mg-Gd intermediate alloys, after 15min is incubated after zinc fusing, then slowly
Graphite crucible 1min is rocked, is put into stove and is stood 2min, poured into metal type dies, obtain the uniform Mg-Zn-Gd quasi-crystalline substances of composition
Alloy；
2）Prepare AZ91 magnesium alloys：
With weight/mass percentage composition as 8.78%Al, 0.83%Zn and 90.39%Mg is raw material, heats and melts and be warming up to 715
DEG C, casting metal type after stirring is obtained AZ91 magnesium alloys, and SF is passed through in fusion process6-CO2It is mixed gas protected, obtain
AZ91 magnesium alloys；
3）Prepare Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys：
Step 1 is taken by proportioning）The Mg-Zn-Gd quasi-crystalline substances intermediate alloy and step 2 of preparation）The AZ91 magnesium alloys of preparation,
SF6-CO2Under mixed gas protected, AZ91 magnesium alloys be put into and be preheating in 680 DEG C of container, then heat to 710 DEG C, treated
After AZ91 magnesium alloys are completely melt, Mg-Zn-Gd quasi-crystalline substance intermediate alloys are added in melt AZ91, in treating Mg-Zn-Gd quasi-crystalline substances
Between after alloy melting, be incubated 20min, stir 1min, stand 5min, then liquation is poured into the punching block of 200 DEG C of preheating, system
Obtain the enhanced AZ91 magnesium alloys of Mg-Zn-Gd Icosahedral phases.
The characteristic parameter for obtaining alloy microscopic appearance is shown in Fig. 4, and alloy property is shown in Fig. 5.
Embodiment 2
A kind of Mg-Zn-Gd Icosahedral phases strengthen AZ91 magnesium alloys, it is characterised in that have the following weight/mass percentage composition to be：Al
8.65%, Zn 2.76%, Gd 0.58%, balance of Mg.
Following steps are taken to be obtained：
1）Prepare Mg-Zn-Gd quasi-crystalline substance intermediate alloys：
Magnesium ingot, zinc ingot metal and Mg-Gd intermediate alloys are got out for raw material by proportioning, furnace temperature are risen to 700 DEG C, putting for magnesium ingot
Enter in graphite crucible, then graphite crucible is put into full of SF6-CO2In the resistance furnace of mixed gas, added after after magnesium ingot fusing
Mg-Gd intermediate alloys, finally add zinc ingot metal after the fusing of Mg-Gd intermediate alloys, after 17min is incubated after zinc fusing, then slowly
Graphite crucible 1.25min is rocked, is put into stove and is stood 2.25min, poured into metal type dies, obtain the uniform Mg-Zn- of composition
Gd quasicrystalline alloy；
2）Prepare AZ91 magnesium alloys：
With weight/mass percentage composition as 8.82%Al, 0.89%Zn and 90.29%Mg is raw material, heats and melts and be warming up to 717
DEG C, casting metal type after stirring is obtained AZ91 magnesium alloys, and SF is passed through in fusion process6-CO2It is mixed gas protected, obtain
AZ91 magnesium alloys；
3）Prepare Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys：
Step 1 is taken by proportioning）The Mg-Zn-Gd quasi-crystalline substances intermediate alloy and step 2 of preparation）The AZ91 magnesium alloys of preparation,
SF6-CO2Under mixed gas protected, AZ91 magnesium alloys be put into and be preheating in 685 DEG C of container, then heat to 720 DEG C, treated
After AZ91 magnesium alloys are completely melt, Mg-Zn-Gd quasi-crystalline substance intermediate alloys are added in melt AZ91, in treating Mg-Zn-Gd quasi-crystalline substances
Between after alloy melting, be incubated 23min, stir 1.2min, stand 7min, then liquation is poured into the punching block of 225 DEG C of preheating,
The enhanced AZ91 magnesium alloys of Mg-Zn-Gd Icosahedral phases are obtained.
The characteristic parameter for obtaining alloy microscopic appearance is shown in Fig. 4, and alloy property is shown in Fig. 5.
Embodiment 3
A kind of Mg-Zn-Gd Icosahedral phases strengthen AZ91 magnesium alloys, it is characterised in that have the following weight/mass percentage composition to be：Al
8.49%, Zn 3.59%, Gd 0.86%, balance of Mg.
Following steps are taken to be obtained：
1）Prepare Mg-Zn-Gd quasi-crystalline substance intermediate alloys：
Magnesium ingot, zinc ingot metal and Mg-Gd intermediate alloys are got out for raw material by proportioning, furnace temperature are risen to 720 DEG C, putting for magnesium ingot
Enter in graphite crucible, then graphite crucible is put into full of SF6-CO2In the resistance furnace of mixed gas, added after after magnesium ingot fusing
Mg-Gd intermediate alloys, finally add zinc ingot metal after the fusing of Mg-Gd intermediate alloys, after 20min is incubated after zinc fusing, then slowly
Graphite crucible 1.5min is rocked, is put into stove and is stood 2.5min, poured into metal type dies, obtain the uniform Mg-Zn-Gd of composition
Quasicrystalline alloy；
2）Prepare AZ91 magnesium alloys：
With weight/mass percentage composition as 8.88%Al, 0.93%Zn and 90.19%Mg is raw material, heats and melts and be warming up to 719
DEG C, casting metal type after stirring is obtained AZ91 magnesium alloys, and SF is passed through in fusion process6-CO2It is mixed gas protected, obtain
AZ91 magnesium alloys；
3）Prepare Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys：
Step 1 is taken by proportioning）The Mg-Zn-Gd quasi-crystalline substances intermediate alloy and step 2 of preparation）The AZ91 magnesium alloys of preparation,
SF6-CO2Under mixed gas protected, AZ91 magnesium alloys be put into and be preheating in 690 DEG C of container, then heat to 730 DEG C, treated
After AZ91 magnesium alloys are completely melt, Mg-Zn-Gd quasi-crystalline substance intermediate alloys are added in melt AZ91, in treating Mg-Zn-Gd quasi-crystalline substances
Between after alloy melting, be incubated 25min, stir 1.5min, stand 8min, then liquation is poured into the punching block of 250 DEG C of preheating,
The enhanced AZ91 magnesium alloys of Mg-Zn-Gd Icosahedral phases are obtained.
The characteristic parameter for obtaining alloy microscopic appearance is shown in Fig. 4, and alloy property is shown in Fig. 5.
Embodiment 4
A kind of Mg-Zn-Gd Icosahedral phases strengthen AZ91 magnesium alloys, it is characterised in that have the following weight/mass percentage composition to be：Al
8.33%, Zn4.39%, Gd 1.11%, balance of Mg.
Following steps are taken to be obtained：
1）Prepare Mg-Zn-Gd quasi-crystalline substance intermediate alloys：
Magnesium ingot, zinc ingot metal and Mg-Gd intermediate alloys are got out for raw material by proportioning, furnace temperature are risen to 730 DEG C, putting for magnesium ingot
Enter in graphite crucible, then graphite crucible is put into full of SF6-CO2In the resistance furnace of mixed gas, added after after magnesium ingot fusing
Mg-Gd intermediate alloys, finally add zinc ingot metal after the fusing of Mg-Gd intermediate alloys, after 20min is incubated after zinc fusing, then slowly
Graphite crucible 1.75min is rocked, is put into stove and is stood 2.25min, poured into metal type dies, obtain the uniform Mg-Zn- of composition
Gd quasicrystalline alloy；
2）Prepare AZ91 magnesium alloys：
With weight/mass percentage composition as 8.90%Al, 0.92%Zn and 90.18%Mg is raw material, heats and melts and be warming up to 718
DEG C, casting metal type after stirring is obtained AZ91 magnesium alloys, and SF is passed through in fusion process6-CO2It is mixed gas protected, obtain
AZ91 magnesium alloys；
3）Prepare Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys：
Step 1 is taken by proportioning）The Mg-Zn-Gd quasi-crystalline substances intermediate alloy and step 2 of preparation）The AZ91 magnesium alloys of preparation,
SF6-CO2Under mixed gas protected, AZ91 magnesium alloys be put into and be preheating in 695 DEG C of container, then heat to 735 DEG C, treated
After AZ91 magnesium alloys are completely melt, Mg-Zn-Gd quasi-crystalline substance intermediate alloys are added in melt AZ91, in treating Mg-Zn-Gd quasi-crystalline substances
Between after alloy melting, be incubated 27min, stir 1.7min, stand 9min, then liquation is poured into the punching block of 275 DEG C of preheating,
The enhanced AZ91 magnesium alloys of Mg-Zn-Gd Icosahedral phases are obtained.
The characteristic parameter for obtaining alloy microscopic appearance is shown in Fig. 4, and alloy property is shown in Fig. 5.
Embodiment 5
A kind of Mg-Zn-Gd Icosahedral phases strengthen AZ91 magnesium alloys, it is characterised in that have the following weight/mass percentage composition to be：Al
8.18%, Zn 5.16%, Gd 0.1.36%, balance of Mg.
Following steps are taken to be obtained：
1）Prepare Mg-Zn-Gd quasi-crystalline substance intermediate alloys：
Magnesium ingot, zinc ingot metal and Mg-Gd intermediate alloys are got out for raw material by proportioning, furnace temperature are risen to 740 DEG C, putting for magnesium ingot
Enter in graphite crucible, then graphite crucible is put into full of SF6-CO2In the resistance furnace of mixed gas, added after after magnesium ingot fusing
Mg-Gd intermediate alloys, finally add zinc ingot metal after the fusing of Mg-Gd intermediate alloys, after 30min is incubated after zinc fusing, then slowly
Graphite crucible 12min is rocked, is put into stove and is stood 3min, poured into metal type dies, obtain the uniform Mg-Zn-Gd of composition accurate
Peritectic alloy；
2）Prepare AZ91 magnesium alloys：
With weight/mass percentage composition as 8.95%Al, 0.96%Zn and 90.09%Mg is raw material, heats and melts and be warming up to 720
DEG C, casting metal type after stirring is obtained AZ91 magnesium alloys, and SF is passed through in fusion process6-CO2It is mixed gas protected, obtain
AZ91 magnesium alloys；
3）Prepare Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys：
Step 1 is taken by proportioning）The Mg-Zn-Gd quasi-crystalline substances intermediate alloy and step 2 of preparation）The AZ91 magnesium alloys of preparation,
SF6-CO2Under mixed gas protected, AZ91 magnesium alloys be put into and be preheating in 700 DEG C of container, then heat to 740 DEG C, treated
After AZ91 magnesium alloys are completely melt, Mg-Zn-Gd quasi-crystalline substance intermediate alloys are added in melt AZ91, in treating Mg-Zn-Gd quasi-crystalline substances
Between after alloy melting, be incubated 30min, stir 2min, stand 10min, then liquation is poured into the punching block of 300 DEG C of preheating,
The enhanced AZ91 magnesium alloys of Mg-Zn-Gd Icosahedral phases are obtained.
Gained alloy microscopic appearance characteristic parameter is shown in Fig. 4, and alloy property is shown in Fig. 5.
Comparative example
A kind of as-cast AZ91 magnesium alloys, it is characterised in that there is the following weight/mass percentage composition to be：Al 8.88%, Zn
0.93%, balance of Mg.
Following steps are taken to be obtained：
Selection mass percent is Al 8.88%, and stove is risen to 720 DEG C by Zn 0.93% and Mg90.19% as raw material, is led to
Enter SF6-CO2It is mixed gas protected, first Mg is put into crucible, 20min is incubated after fusing, Al material and Zn material are sequentially added, treat Al
After Zn fusings, 1min is stirred, after insulation 10min, poured into the punching block of 250 DEG C of preheating, obtain As-Cast AZ 91 Magnesium Alloy.
The AZ91 magnesium alloys that comparative example is prepared, each component weight percentage is 8.85%Al, 0.941%Zn, surplus
It is magnesium.The volume fraction of the second phase is 25.32% in obtained AZ91 magnesium alloys.The obtained average dendrite length of AZ91 magnesium alloys
It is 76.32 μm；Second is mutually Mg17Al12Phase；Crystal grain is the crystal grain of the magnesium matrix α-Mg under the second phase separation；AZ91 magnesium alloys
Microscopic appearance is：Large stretch of continuous Mg17Al12Magnesium matrix crystal boundary is distributed in, the magnesium matrix is α-Mg；
Gained alloy microscopic appearance characteristic parameter is shown in Fig. 4, and alloy property is shown in Fig. 5.
The AZ91 magnesium alloys for choosing composition close with embodiment are compared, and the weight ratio of the AZ91 each elements of comparative example is：
Al 8.88%, Zn 0.93%, balance of Mg.
The microscopic appearance characterization parameter of comparative example and each embodiment is as shown in Figure 4；The mechanical property of comparative example and each embodiment
Can be as shown in Figure 5 with decay resistance comparing result.
Result shows that dendrite length is obviously reduced in alloy of the present invention, and comprehensive mechanical property is obviously improved, and corrosive nature shows
Write and improve：Tensile strength highest improves 93MPa, improves 55.69%, and yield strength highest improves 25MPa, improves 38.46%,
Elongation percentage highest is promoted to 4.1%.
Claims (3)
1. a kind of Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys, it is characterised in that the Icosahedral phases strengthen AZ91 magnesium alloys by with
Lower weight/mass percentage composition composition：Al 8.33~8.82%, Zn 1.90~4.39%, Gd 0.29~1.11%, balance of Mg；Wherein
Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys microscopic appearance be：Discontinuous netted Mg17Al12With a small amount of particle
Shape icosahedral quasicrystal coexists；The Icosahedral phases enhancing AZ91 magnesium alloy substrates are α-Mg；The volume fraction of wherein the second phase is
12.42~20.84%；Average dendrite length is 13.45~72.61 μm；Described second mutually includes, discontinuous netted
Mg17Al12With a small amount of graininess icosahedral quasicrystal；Described dendrite length is the average dendrite length of the second phase.
2. a kind of Mg-Zn-Gd Icosahedral phases of claim 1 strengthen the preparation method of AZ91 magnesium alloys, it is characterised in that：First
Prepare Mg-Zn-Gd quasi-crystalline substance intermediate alloys；Melting AZ91 magnesium alloys；Mg-Zn-Gd intermediate alloys, AZ91 magnesium alloys are melted again
Refining, is obtained Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys；
Specifically include following steps：
1）Prepare Mg-Zn-Gd quasi-crystalline substance intermediate alloys：
Magnesium ingot, zinc ingot metal and Mg-Gd intermediate alloys are got out for raw material by proportioning, furnace temperature are risen to 680-740 DEG C, putting for magnesium ingot
Enter in graphite crucible, then graphite crucible is put into full of SF6-CO2In the resistance furnace of mixed gas, added after after magnesium ingot fusing
Mg-Gd intermediate alloys, finally add zinc ingot metal after the fusing of Mg-Gd intermediate alloys, after 15~30min is incubated after zinc fusing, then
1~2min of graphite crucible slowly is rocked, 2~3min of standing in stove is put into, poured into metal type dies, obtain composition uniform
Mg-Zn-Gd quasicrystalline alloy；
2）Prepare AZ91 magnesium alloys：
It is 8.78~8.95% Al, 0.83~0.96%Zn and 90.09~90.39%Mg for raw material with weight/mass percentage composition, plus
Heat fusing is simultaneously warming up to 715~720 DEG C, casting metal type after stirring, and AZ91 magnesium alloys are obtained, and is passed through in fusion process
SF6-CO2It is mixed gas protected, obtain AZ91 magnesium alloys；
3）Prepare Mg-Zn-Gd Icosahedral phases enhancing AZ91 magnesium alloys：
Step 1 is taken by proportioning）The Mg-Zn-Gd quasi-crystalline substances intermediate alloy and step 2 of preparation）The AZ91 magnesium alloys of preparation, in SF6-
CO2Under mixed gas protected, AZ91 magnesium alloys be put into and be preheating in 680~700 DEG C of container, then heat to 710~740
DEG C, after AZ91 magnesium alloys are completely melt, Mg-Zn-Gd quasi-crystalline substance intermediate alloys are added in melt AZ91, treat Mg-Zn-Gd
After the fusing of quasi-crystalline substance intermediate alloy, 20~30min is incubated, stirs 1~2min, stand 5~10min, be then poured into liquation pre-
In the punching block of 200~300 DEG C of heat, the enhanced AZ91 magnesium alloys of Mg-Zn-Gd Icosahedral phases are obtained；
Mg-Zn-Gd quasi-crystalline substance intermediate alloys wherein described in step (1), its composition weight/mass percentage composition be：46.12~46.95%
Zn, 14.85~15.02%Gd, balance of Mg.
3. preparation method according to claim 2, it is characterised in that：Described step 3) in, Mg-Zn-Gd quasicrystalline alloy
Addition for AZ91 material qualities 2.00~10.00%.
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