CN107858575A - A kind of high-strength temperature-resistant casting magnesium alloy material and preparation method thereof - Google Patents

A kind of high-strength temperature-resistant casting magnesium alloy material and preparation method thereof Download PDF

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Publication number
CN107858575A
CN107858575A CN201711090005.8A CN201711090005A CN107858575A CN 107858575 A CN107858575 A CN 107858575A CN 201711090005 A CN201711090005 A CN 201711090005A CN 107858575 A CN107858575 A CN 107858575A
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alloy
temperature
magnesium alloy
casting
preparation
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Inventor
庞松
任静
徐永东
朱秀荣
任政
刘辰
王军
王荣
曾羽
曹召勋
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China Weapon Science Academy Ningbo Branch
Chinese Academy of Ordnance Science Ningbo Branch
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Chinese Academy of Ordnance Science Ningbo Branch
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon

Abstract

A kind of high-strength temperature-resistant casting magnesium alloy material and preparation method thereof, alloying component percentage by weight are：3.5~6.5%Y, 1.5~3.5%Nd, 1.5~4%Gd, 0~0.5%Zn, 0.2~0.7%Zr, 0~0.5Ag, surplus Mg, preparation process：Calculating and dispensing；Melting；Cast；Heat treatment.The present invention is directed to high-strength heat-resistant magnesium alloy poor fluidity, the material technology problem that hot cracking tendency is big and segregation is serious, develop the novel high-strength heat resistance casting magnesium alloy material used in suitable for manufacture high-performance complex thin-wall Mg alloy castings, scientific formulation, rational technology, the magnesium alloy of preparation is while obdurability is kept with good heat resistance and Production Practice of Casting Technologies, the casting of manufacture has good quality, the characteristics of high yield rate and high technology stability, and cost is relatively low, development and production available for high-end Light weight castings, have broad application prospects, be particularly suitable for use in weapons, space flight, the national defense industry such as aviation and civilian traffic high-end field.

Description

A kind of high-strength temperature-resistant casting magnesium alloy material and preparation method thereof
Technical field
The invention belongs to metal material and metallurgical class technical field, be related to a kind of high-strength temperature-resistant casting magnesium alloy material and its Preparation method, suitable for magnesium alloy materials preparation and magnesium alloy ingot, castings production, it is particularly suitable for use in manufacture, is large complicated Thin-walled high-performance magnesium-alloy casting.
Background technology
Magnesium alloy density is low, specific strength is high, specific stiffness is high, and with good diamagnetism, electronegativity, thermal conductivity, resistance Buddhist nun's damping property and cutting ability, by more and more extensive attention, it has been widely used in automobile, 3C Product field. However, the shortcomings that intensity deficiency and bad heat resistance, seriously hinders the development and application of magnesium alloy materials.Existing heat resistant magnesium Alloy is mainly started with from limitation dislocation motion and reinforcing crystal boundary.The elevated temperature strength of magnesium alloy is mainly improved by following means with resisting Croop property：(1) the second high phase of heat endurance is introduced；(2) diffusion rate of the element in magnesium matrix is reduced；(3) improve brilliant Boundary's configuration state and tissue morphology.
Rare earth (RE) is to improve the maximally effective alloying element of magnesium alloy heat resistance, and main cause is suitable rare earth element In the magnesium alloy in addition to degasification, removal of impurities, improving casting fluidity, corrosion resisting property, while most of rare earth element has in magnesium There is larger solid solubility limit, and decline with temperature, solid solubility is drastically reduced, and can obtain larger degree of supersaturation, so as to Diffusion-precipitation, high-melting-point rare earth compound phase in subsequent ag(e)ing process.Rare earth element not only can be with crystal grain thinning, raising Room temperature strength, and the high-melting-point rare earth compound of transgranular, crystal boundary (mainly crystal boundary) is distributed in, pinning crystalline substance is remained in high temperature Interior dislocation and Grain Boundary Sliding, so as to improve the elevated temperature strength of magnesium alloy, while diffusion rate of the rare earth element in magnesium matrix Relatively slow, this causes Mg-RE alloys to be suitable to the long-term work under higher temperature environment, and in the national defence work such as weapons, space flight, aviation Industry field has been obtained for extensive research and certain application, for example, Mg-Nd-Zn systems are used for magnesium alloy in body base part Develop and production, Mg-Gd-Y systems nacelle class used for magnesium alloy in ultrahigh heat-resistant performance requirement and it is some close, heavy parts Develop and produce.
However, above-mentioned two classes heatproof magnesium alloy material is in terms of the matching of mechanical property and processing performance, there is protrusion Contradiction.ZM6 magnesium alloys have good Production Practice of Casting Technologies, although can be heat-resisting, the alloy aoxidizes in fusion process Seriously, casting body sampling mechanical property is than relatively limited, room temperature tensile properties Rm=180MPa, R0.2=120MPa, A=2%. Although Mg-Gd-Y systems novel high-strength heat resistance magnesium alloy is with excellent room temperature and elevated temperature strength, rare-earth usage is larger, cost Height, smelting technology difficulty is big, and alloy flowability is low, and the serious casting such as fracture, segregation is easily produced during casting forming and is lacked Fall into, available for the casting developed to performance requirement harshness but negligible amounts.The commercial heat resistance magnesium alloy more ripe as one kind, WE43, WE54 magnesium alloy show good in terms of heat-resisting and forming property.Although casting body sampling room temperature tensile properties are averaged Value can reach Rm=250MPa, R0.2=178MPa, A=3%, 250 DEG C of tensile property average values reach Rm=210MPa, R0.2 =150MPa, A=12%, but still the requirement of some high-end casting can not be met.This significantly limit resistance to a certain extent Application of the hot magnesium alloy materials in terms of the development of high-performance casting and equipment.
At present, Grand Equipments casting magnesium alloy material have been proposed higher performance indications with new model product, compel A kind of novel high-strength heatproof magnesium alloy material with good Production Practice of Casting Technologies will be developed by being essential.In addition to refined crystalline strengthening, Gu Molten reinforcing is to improve the maximally effective means of cast magnesium alloy performance with ageing strengthening.Two or more are added into magnesium alloy substrate Rare earth element, complex intensifying effect can be played by increasing distortion of lattice, can reduce rare earth while realizing and strengthening make Dosage, reach the purpose for reducing cost and loss of weight.A small amount of Zn elements are added into Mg-RE alloys, can not only regulate and control Mg-RE conjunctions The Precipitation tissue of gold system, and the quasi-crystalline substance in addition to precipitated phase and long period stacking structure (Long can be formed Period stacking ordered structure, abbreviation LPSO structure).This structure is highly stable under the high temperature conditions, The mechanical behavior under high temperature of magnesium alloy, particularly creep-resistant property can be significantly improved.Ag atomic radius differs 11% with Mg, Gu After being dissolved in Mg, magnesium matrix distortion of lattice is larger, it is possible to increase solid solution strengthening effect.In addition, Ag can be solid-solution in β ' precipitated phases In further improve precipitated phase high-temperature stability, additionally it is possible to β ' is mutually separated out more uniform, effectively lifting rare earth magnesium conjunction The elevated temperature strength of gold.
The content of the invention
First technical problem to be solved by this invention is to provide a kind of good and inexpensive height of Production Practice of Casting Technologies Strong heat resistance casting magnesium alloy material.
Second technical problem to be solved by this invention is to provide a kind of preparation of high-strength temperature-resistant casting magnesium alloy material Method, the magnesium alloy of preparation have the characteristics of Production Practice of Casting Technologies is good, intensity is high, heat-resist and inexpensive.
Technical scheme is used by the present invention solves above-mentioned first technical problem：A kind of high-strength temperature-resistant cast magnesium alloy Material, it is characterised in that：The alloying component percentage by weight of the high-strength temperature-resistant casting magnesium alloy material is：
3.5~6.5%Y, 1.5~3.5%Nd, 1.5~4%Gd, 0~0.5%Zn, 0.2~0.7%Zr, 0~0.5% Ag, surplus Mg.
Technical scheme is used by the present invention solves above-mentioned second technical problem：A kind of high-strength temperature-resistant cast magnesium alloy The preparation method of material, it is characterised in that comprise the following steps：
1) calculating and dispensing：The content of every kind of alloying element is calculated according to the alloying component of magnesium alloy and carries out alloy raw material Weighing and burden；
2) melting：Related furnace charge is sequentially added according to smelting technology requirement, uses flux protection, percentage by weight during melting Less than 3%, used before pouring into a mould and be mixed with 0.5~5Vol.%SF6CO2Mixed gas is protected；
3) pour into a mould：When melt is cooled to pouring temperature, after skimming dross on surface of fusant, aluminium alloy is poured into pre- in advance In the good mold die of heat, mold and take out after alloy completely solidification；
4) it is heat-treated：Handled including solution treatment and artificial aging.
As an improvement, the dispensing in the step 1) is also needed to according to alloy smelting process, the scaling loss with reference to alloying element Rule and raw material service condition are carried out.
Preferably, the alloy raw material in the step 1) is simple metal or intermediate alloy or salt.
As an improvement, the detailed process of the step 2) melting is：
A, it is all alloy raw material removing surfaces are clean, expose metallic luster, be preheated to 200 ± 10 DEG C；
B, crucible is preheated to 400 ± 10 DEG C, adds pure Mg, carried out melting protection using the special coverture of magnesium alloy, stir Mix, when furnace temperature is risen into 720~740 DEG C, after pure Mg is completely melt, sequentially add the alloy raw material containing Zn, Nd, Gd, Y, Melt temperature is promoted to 780 DEG C ± 10 DEG C, adds the alloy raw material containing Zr, Ag, bottom is dragged for and stirs ± 3 minutes 8 minutes；
Wherein magnesium alloy covering agent is one kind of melting auxiliary agent, is mainly made up of salt-mixture, typically contains KCl, MgCl2 Deng being the technique that alloy melting process has to use, belong to general technology, total addition is less than 3wt.%；
C, melt temperature is down to 750 DEG C ± 10 DEG C again, refines ± 3 minutes 5 minutes, drag for bottom and skim, by melt temperature liter Temperature stands ± 10 minutes 20 minutes to 780 DEG C ± 10 DEG C；
D, then, melt is cooled to 730 DEG C ± 25 DEG C, poured into a mould.
Further, the detailed process of the step 3) cast is：
A, metal mold or sand mold mould are preheated more than 4 hours, 240~300 DEG C；
B, placing ceramic, fibrous filter net in casting-up system；
C, treat that melt to 730 DEG C ± 25 DEG C of cast temperature is designed, skims dross on surface of fusant, shift crucible or installation rises liquid Pipe；
D, aluminium alloy is poured into casting mold, molds and take out after complete solidification.
Finally, the heat treatment of the step 4) is carried out in using the chamber type electric resistance furnace with forced convection device, its The temperature of middle solution treatment is 500~545 DEG C, soaking time 8-20 hours, water quenching or air cooling；The temperature of Ageing Treatment is 215 ~255 DEG C, soaking time 8~20 hours, air cooling.
Compared with prior art, the advantage of the invention is that：The casting magnesium alloy material obtained using this preparation method is had There is the characteristics of intensity is high, heat-resist, the casting manufactured using the magnesium alloy materials of the present invention has good quality, high yield rate And technology stability it is high the characteristics of, in being particularly suitable for use in, the development and production of large-scale complex thin-wall high-performance magnesium-alloy casting. After tested, the room-temperature property index of material can reach：Rm≥280MPa、R0.2>=210MPa, A >=4.0%；At 200 DEG C, Rm≥ 260MPa、R0.2>=190MPa, A >=7.0%；At 300 DEG C, Rm≥180MPa、R0.2>=150MPa, A >=12.0%.The present invention matches somebody with somebody Fang Kexue, rational technology, the material provided can either solve ZM-6, WE series Elevated Temperature Mechanical Properties of Mg Alloys with preparation method Insufficient material technology problem, it also can solve the problem that Mg-Gd-Y series fluidity of magnesium alloy is poor, hot cracking tendency is big, the easily casting such as segregation The technical barrier in terms of processing performance is made, the performance indications to lifting the high-end Mg alloy castings in China, enriches high performance heat resistant casting Making magnesium alloy materials system has prominent meaning.
Brief description of the drawings
Fig. 1 is as cast condition Mg-3.5Y-2Nd-2Gd-0.4Zn-0.6Zr (- 0.2Ag) alloy of embodiment 1 provided by the invention Metallograph；
Fig. 2 a~2b be embodiment 2 provided by the invention Mg-4.5Y-2.5Nd-1.5Gd-0.2Zn-0.6Zr (- 0.3Ag) the high resolution scanning electromicroscopic photograph of alloy, wherein a-6H ' is mutually from crystal boundary to transgranular growth；B-6H ' is mutually inside crystal boundary The direction of growth；
Fig. 3 a~3b are the optics metallurgical of the alloy-T6 states of embodiment 3 provided by the invention, wherein a-14 hours；b- 20 hours；
Fig. 4 a~4b are the TEM photos of the alloy-T6 states of embodiment 3 provided by the invention, wherein a- crystal boundaries；B- is transgranular.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
Alloying element percentage in following examples is mass percent.
Embodiment 1
Prepare Mg-3.5Y-2Nd-2Gd-0.4Zn-0.6Zr (- 0.2Ag) alloy 4kg.
First, according to alloy smelting process, with reference to the scaling loss rule of element, dispensing is carried out.
Weigh and closed among 25%Mg-Y intermediate alloys 0.8kg, 25%Mg-Nd intermediate alloy 0.34kg, 25%Mg-Gd successively Golden 0.36kg, Zn0.016kg, 30%Mg-Zr intermediate alloys 0.27kg, pure Ag0.008kg, pure Mg2.21kg.
All alloy raw material removing surfaces are clean, expose metallic luster, be preheated to 200 DEG C.
Secondly, crucible is preheated to 400 DEG C, adds pure Mg, using flux, SF during melting6With CO2Mixed gas is combined Method protected, wherein, flux protection is used during melting, percentage by weight is less than 3%, before pouring into a mould using be mixed with 0.5~ 5Vol.%SF6CO2Mixed gas is protected；The special coverture of magnesium alloy is added simultaneously and carries out melting protection, and wherein magnesium closes Golden coverture is one kind of melting auxiliary agent, is mainly made up of salt-mixture, typically contains KCl, MgCl2Deng being alloy melting process The technique used is had to, belongs to general technology, total addition is less than 3wt.%, and furnace temperature is risen into 720 DEG C, treats that pure Mg is complete After fusing, pure Zn is added, when melt temperature is at 720~740 DEG C, sequentially adds Mg-Nd, Mg-Gd, Mg-Y intermediate alloy, will Melt temperature is promoted to 780 DEG C ± 10 DEG C, adds Mg-Zr intermediate alloys, pure Ag, drags for bottom and stirs ± 3 minutes 8 minutes.
Melt temperature is down to 750 DEG C ± 10 DEG C again, is refined ± 3 minutes 5 minutes, is dragged for bottom and skim, melt temperature is lifted To 780 DEG C, ± 5 minutes 20 minutes are stood.
Then, melt is cooled to 740 DEG C ± 5 DEG C, preheated metal type dies (240~300 DEG C) is transferred to and poured Station is noted, completes cast, is molded after alloy completely solidification, takes out ingot casting.
Finally, ingot casting is heat-treated, technological parameter is：535 DEG C ± 5 DEG C are dissolved 10 hours, 80 DEG C of ± 10 DEG C of water quenchings； 225 DEG C of ± 5 DEG C of timeliness 12 hours.
Production Practice of Casting Technologies test is carried out to alloy, it is as a result as follows：
At 740 DEG C, the long 310mm of mobility coupon, hot cracking tendency (ring width) 30~35mm, linear shrinkage ratio 1.3~1.5%.
Stretching mechanical property testing is carried out to alloy, it is as a result as follows：
Room temperature, Rm=285MPa, A=5.5%；At 200 DEG C, Rm=270MPa, A=9.5%；At 300 DEG C, Rm= 185MPa, A=13.5%.
The metallograph of the cast alloy of the present embodiment is as shown in Figure 1.
Embodiment 2
Prepare Mg-4.5Y-2.5Nd-1.5Gd-0.2Zn-0.7Zr (- 0.3Ag) alloy 40kg.
First, according to alloy smelting process, with reference to the scaling loss rule of element, dispensing is carried out.
Weigh successively among 30%Mg-Y intermediate alloys 8.57kg, 90%Mg-Nd intermediate alloy 1.21kg, 90%Mg-Gd Alloy 0.74kg, pure Zn0.08kg, 30%Mg-Zr intermediate alloys 3.11kg, pure Ag0.12kg, pure Mg26.18kg.
All alloy raw material removing surfaces are clean, expose metallic luster, be preheated to 200 DEG C.
Secondly, crucible is preheated to 400 DEG C, adds pure Mg, using flux, SF during melting6With CO2Mixed gas is combined Method protected, wherein melting when use flux protection, percentage by weight is less than 3%, before pouring into a mould using be mixed with 0.5~ 5Vol.%SF6CO2Mixed gas is protected；Melting protection is carried out using the special coverture of magnesium alloy simultaneously, wherein magnesium closes Golden coverture is one kind of melting auxiliary agent, is mainly made up of salt-mixture, typically contains KCl, MgCl2Deng being alloy melting process The technique used is had to, belongs to general technology, total addition is less than 3wt.%, and furnace temperature is risen into 720 DEG C, treats that pure Mg is complete After fusing, pure Zn is added, when melt temperature is at 720~740 DEG C, sequentially adds Mg-Nd, Mg-Gd, Mg-Y intermediate alloy, will Melt temperature is promoted to 780 DEG C ± 10 DEG C, adds Mg-Zr intermediate alloys, pure Ag, drags for bottom and stirs ± 3 minutes 8 minutes.
Melt temperature is down to 750 DEG C ± 10 DEG C again, is refined ± 3 minutes 5 minutes, is dragged for bottom and skim, melt temperature is lifted To 780 DEG C, ± 5 minutes 20 minutes are stood.
Then, melt is cooled to 740 DEG C ± 5 DEG C, preheated metal type dies (240~300 DEG C) is transferred to and poured Station is noted, completes cast, is molded after alloy completely solidification, takes out ingot casting.
Finally, ingot casting is heat-treated, technological parameter is：525 DEG C ± 5 DEG C are dissolved 16 hours, 80 DEG C of ± 10 DEG C of water quenchings； 225 DEG C of ± 5 DEG C of timeliness 12 hours.
Production Practice of Casting Technologies test is carried out to alloy, it is as a result as follows：
At 745 DEG C, the long 290mm of mobility coupon, hot cracking tendency (ring width) 35~40mm, linear shrinkage ratio 1.2~1.3%.
Stretching mechanical property testing is carried out to alloy, it is as a result as follows：
Room temperature, Rm=307MPa, A=4.8%；At 200 DEG C, Rm=285MPa, A=8.5%；At 300 DEG C, Rm= 190MPa, A=13.5%.
The TEM photos of the alloy of the present embodiment are as shown in Figure 2.
Embodiment 3
Prepare Mg-5.5Y-1.5Nd-3.5Gd-0.2Zn-0.5Zr (- 0.5Ag) alloy 300kg.
First, according to alloy smelting process, with reference to the scaling loss rule of element, dispensing is carried out.
Weigh successively among 30%Mg-Y intermediate alloys 78.6kg, 30%Mg-Nd intermediate alloy 15.8kg, 30%Mg-Gd Alloy 38.9kg, pure Zn0.6kg, 30%Mg-Zr intermediate alloys 16.7kg, pure Ag1.5kg, pure Mg147.9kg.
All alloy raw material removing surfaces are clean, expose metallic luster, be preheated to 200 DEG C.
Secondly, crucible is preheated to 400 DEG C, adds pure Mg, using flux, SF during melting6With CO2Mixed gas is combined Method protected, wherein melting when use flux protection, percentage by weight is less than 3%, before pouring into a mould using be mixed with 0.5~ 5Vol.%SF6CO2Mixed gas is protected；Melting protection is carried out using the special coverture of magnesium alloy simultaneously, wherein magnesium closes Golden coverture is one kind of melting auxiliary agent, is mainly made up of salt-mixture, typically contains KCl, MgCl2Deng being alloy melting process The technique used is had to, belongs to general technology, total addition is less than 3wt.%, and furnace temperature is risen into 720 DEG C, treats that pure Mg is complete After fusing, pure Zn is added, when melt temperature is at 720~740 DEG C, sequentially adds Mg-Nd, Mg-Gd, Mg-Y intermediate alloy, will Melt temperature is promoted to 780 DEG C ± 10 DEG C, adds Mg-Zr intermediate alloys, pure Ag, drags for bottom and stirs ± 3 minutes 8 minutes.
Melt temperature is down to 750 DEG C ± 10 DEG C again, is refined ± 3 minutes 5 minutes, is dragged for bottom and skim, melt temperature is lifted To 780 DEG C, ± 5 minutes 20 minutes are stood.
Then, melt is cooled to 740 DEG C ± 5 DEG C, preheated metal type dies (240~300 DEG C) is transferred to and poured Station is noted, completes cast, is molded after alloy completely solidification, takes out ingot casting.
Finally, ingot casting is heat-treated, technological parameter is：535 DEG C ± 5 DEG C are dissolved 10 hours, 80 DEG C of ± 10 DEG C of water quenchings； 225 DEG C of ± 5 DEG C of timeliness 20 hours.
Production Practice of Casting Technologies test is carried out to alloy, it is as a result as follows：
At 740 DEG C, the long 275mm of mobility coupon, hot cracking tendency (ring width) 30~35mm, linear shrinkage ratio 1.2~1.3%.
Stretching mechanical property testing is carried out to alloy, it is as a result as follows：
Room temperature, Rm=315MPa, A=4.2%；At 200 DEG C, Rm=290MPa, A=7.5%；At 300 DEG C, Rm= 195MPa, A=12.5%.
The metallograph and TEM photos of the-T6 states of the present embodiment are as shown in Figure 3,4.
Three embodiments of summary, the inventive method prove：Two or more rare earths are added into magnesium alloy substrate Element, complex intensifying effect can be played by increasing distortion of lattice, rare earth usage amount can be reduced while realizing and strengthening, Reaching reduces the purpose of cost and loss of weight.A small amount of Zn elements are added, can not only regulate and control the Precipitation group of Mg-RE alloy systems Knit, and quasi-crystalline substance and long period stacking structure in addition to precipitated phase can be formed, significantly improve the high-temperature mechanics of magnesium alloy Performance, particularly creep-resistant property.Ag can lift solid solution strengthening effect, also further improve β ' precipitated phase high-temperature stabilities, β ' can also be made mutually to separate out more uniform, be effectively improved the elevated temperature strength of magnesium-rare earth.
Mg-Y-Nd-Gd-Zn-Zr (- Ag) provided by the invention is that a kind of Production Practice of Casting Technologies is good and special with low cost The high-strength temperature-resistant casting magnesium alloy material of point, it can solve the problem that the material of conventional heat resistance casting magnesium alloy mechanical behavior under high temperature deficiency is asked Topic, also can solve the problem that the bad technical barrier of the higher high-strength heat-resistant magnesium alloy Production Practice of Casting Technologies of content of rare earth, the present invention carries Supply in can be directly used for, the development and production of large-scale complex thin-wall high-performance magnesium-alloy casting, met national project research The Strategic Demand of development.

Claims (7)

  1. A kind of 1. high-strength temperature-resistant casting magnesium alloy material, it is characterised in that：The alloy of the high-strength temperature-resistant casting magnesium alloy material Composition by weight percent is：
    3.5~6.5%Y, 1.5~3.5%Nd, 1.5~4%Gd, 0~0.5%Zn, 0.2~0.7%Zr, 0~0.5%Ag, it is remaining Measure as Mg.
  2. 2. the preparation method of high-strength temperature-resistant casting magnesium alloy material according to claim 1, it is characterised in that including following Step：
    1) calculating and dispensing：Calculate the content of every kind of alloying element according to the alloying component of magnesium alloy and carry out alloy raw material and weigh Dispensing；
    2) melting：Related furnace charge is sequentially added according to smelting technology requirement, uses flux protection during melting, percentage by weight is less than 3%, used before pouring into a mould and be mixed with 0.5~5Vol.%SF6CO2Mixed gas is protected；
    3) pour into a mould：When melt is cooled to pouring temperature, after skimming dross on surface of fusant, aluminium alloy is poured into preheated in advance Mold die in, after alloy completely solidification after mold take out；
    4) it is heat-treated：Handled including solution treatment and artificial aging.
  3. 3. preparation method according to claim 2, it is characterised in that：Dispensing in the step 1) is also needed to according to alloy Smelting technology, the scaling loss rule with reference to alloying element and raw material service condition are carried out.
  4. 4. preparation method according to claim 2, it is characterised in that：Alloy raw material in the step 1) for simple metal or Intermediate alloy or salt.
  5. 5. preparation method according to claim 2, it is characterised in that：The detailed process of the step 2) melting is：
    A, it is all alloy raw material removing surfaces are clean, expose metallic luster, be preheated to 200 ± 10 DEG C；
    B, crucible is preheated to 400 ± 10 DEG C, adds pure Mg, carried out melting protection using the special coverture of magnesium alloy, stir, will When furnace temperature rises to 720~740 DEG C, after pure Mg is completely melt, the alloy raw material containing Zn, Nd, Gd, Y is sequentially added, by melt Temperature is promoted to 780 DEG C ± 10 DEG C, adds the alloy raw material containing Zr, Ag, drags for bottom and stirs ± 3 minutes 8 minutes；
    C, melt temperature is down to 750 DEG C ± 10 DEG C again, refines ± 3 minutes 5 minutes, drag for bottom and skim, melt temperature is warming up to 780 DEG C ± 10 DEG C, stand ± 10 minutes 20 minutes；
    D, then, melt is cooled to 730 DEG C ± 25 DEG C, poured into a mould.
  6. 6. preparation method according to claim 2, it is characterised in that：The detailed process of the step 3) cast is：
    A, metal mold or sand mold mould are preheated more than 4 hours, 240~300 DEG C；
    B, placing ceramic, fibrous filter net in casting-up system；
    C, treat that melt to 730 DEG C ± 25 DEG C of cast temperature is designed, skims dross on surface of fusant, shift crucible or installation stalk；
    D, aluminium alloy is poured into casting mold, molds and take out after complete solidification.
  7. 7. preparation method according to claim 2, it is characterised in that：The heat treatment of the step 4) is using with strong Carried out in the chamber type electric resistance furnace of convection device processed, wherein the temperature of solution treatment is 500~545 DEG C, soaking time 8-20 hours, Water quenching or air cooling；The temperature of Ageing Treatment is 215~255 DEG C, soaking time 8~20 hours, air cooling.
CN201711090005.8A 2017-11-08 2017-11-08 A kind of high-strength temperature-resistant casting magnesium alloy material and preparation method thereof Pending CN107858575A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108624793A (en) * 2018-08-23 2018-10-09 中国科学院长春应用化学研究所 A kind of high-strength heat-resistant magnesium alloy and preparation method thereof containing Ag
CN109023175A (en) * 2018-10-08 2018-12-18 吉林大学 The heat treatment process of magnesium-rare earth
WO2020171794A1 (en) * 2019-02-20 2020-08-27 Публичное акционерное общество "МОТОР СИЧ" (АО "МОТОР СИЧ") Fixation element for osteosynthesis
CN112746189A (en) * 2021-02-01 2021-05-04 太原理工大学 Preparation method of high-toughness magnesium alloy and roll forming process of plate thereof
CN113373361A (en) * 2021-06-22 2021-09-10 河北钢研德凯科技有限公司 High-strength cast magnesium alloy and preparation method and application thereof
CN113913712A (en) * 2021-10-09 2022-01-11 哈尔滨工程大学 Method for improving age hardening effect of magnesium alloy
CN114351021A (en) * 2021-12-28 2022-04-15 沈阳铸研科技有限公司 High-performance cast magnesium alloy material for aerospace and preparation method thereof
CN115637363A (en) * 2022-11-04 2023-01-24 南昌航空大学 High-performance heat-resistant corrosion-resistant magnesium alloy casting and preparation method thereof

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108624793A (en) * 2018-08-23 2018-10-09 中国科学院长春应用化学研究所 A kind of high-strength heat-resistant magnesium alloy and preparation method thereof containing Ag
CN108624793B (en) * 2018-08-23 2020-08-25 中国科学院长春应用化学研究所 Ag-containing high-strength heat-resistant magnesium alloy and preparation method thereof
CN109023175A (en) * 2018-10-08 2018-12-18 吉林大学 The heat treatment process of magnesium-rare earth
WO2020171794A1 (en) * 2019-02-20 2020-08-27 Публичное акционерное общество "МОТОР СИЧ" (АО "МОТОР СИЧ") Fixation element for osteosynthesis
CN112746189A (en) * 2021-02-01 2021-05-04 太原理工大学 Preparation method of high-toughness magnesium alloy and roll forming process of plate thereof
CN112746189B (en) * 2021-02-01 2021-09-24 太原理工大学 Preparation method of high-toughness magnesium alloy and roll forming process of plate thereof
CN113373361A (en) * 2021-06-22 2021-09-10 河北钢研德凯科技有限公司 High-strength cast magnesium alloy and preparation method and application thereof
CN113913712A (en) * 2021-10-09 2022-01-11 哈尔滨工程大学 Method for improving age hardening effect of magnesium alloy
CN114351021A (en) * 2021-12-28 2022-04-15 沈阳铸研科技有限公司 High-performance cast magnesium alloy material for aerospace and preparation method thereof
CN115637363A (en) * 2022-11-04 2023-01-24 南昌航空大学 High-performance heat-resistant corrosion-resistant magnesium alloy casting and preparation method thereof

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Application publication date: 20180330