CN104451314B - A kind of high-strength temperature-resistant cast magnesium alloy and preparation method - Google Patents

A kind of high-strength temperature-resistant cast magnesium alloy and preparation method Download PDF

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CN104451314B
CN104451314B CN201410787879.9A CN201410787879A CN104451314B CN 104451314 B CN104451314 B CN 104451314B CN 201410787879 A CN201410787879 A CN 201410787879A CN 104451314 B CN104451314 B CN 104451314B
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alloy
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CN104451314A (en
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李子炯
苏玉玲
杨红军
王海燕
常同钦
运高谦
王永强
张伟阳
刘德伟
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Zhengzhou University of Light Industry
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C23/00Alloys based on magnesium
    • C22C23/06Alloys based on magnesium with a rare earth metal as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C23/00Alloys based on magnesium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C23/00Alloys based on magnesium
    • C22C23/04Alloys based on magnesium with zinc or cadmium as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06Changing 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

The invention discloses a kind of high-strength temperature-resistant cast magnesium alloy, the component of this cast magnesium alloy and mass percent thereof are: 2 ~ 8%Y, 1 ~ 4%Zn, 1 ~ 3%Si, 0.3 ~ 0.7%Zr, 0.1 ~ 0.3%B, the total amount of Impurity Fe, Cu and Ni is less than 0.03%, and surplus is Mg; The present invention generates the Mg of high elastic modulus by add Si in the Mg-Y-Zn alloy with high strength LPSO structure2Si hardening constituent, carries heavy alloyed elastic modelling quantity, meanwhile, adds K2ZrCl6-LiCl-CaF2 salt-mixture refinement α-Mg matrix, adds Mg-B2O3Alterant is to the nascent Mg of thick dendroid2The Si processing of going bad, realizes α-Mg and Mg2The grain refinement of Si, and then carry out three-stage solution processing and Ageing Treatment, and then prepare high-strength temperature-resistant cast magnesium alloy.

Description

A kind of high-strength temperature-resistant cast magnesium alloy and preparation method
Technical field
The present invention relates to nonferrous materials and manufacture field thereof, specifically, what relate to is a kind of high-strength temperature-resistant castingMagnesium alloy and preparation method.
Background technology
Magnesium alloy is the lightest structural metallic materials in current practical application, have that density is little, specific strength and specific stiffness highEtc. advantage, there is application prospect very widely in the field such as automobile, Aero-Space. In recent years, Aero-Space and communications and transportationThe speed of instrument is more and more higher, and required power power is increasing, and the stability requirement of member is highly reliable, resistance to magnesium alloyCalorific intensity and elastoresistance deformability are had higher requirement, and the elastic modelling quantity of ordinary magnesium alloy is about aluminium alloy60%, generally, between 40 ~ 45GPa, even the high-strength heat-resistant rare earth magnesium alloy Mg – Gd – Y – Zr of recent development, Chen Changjiang is largeResearch table in scholar's paper " developmental research of heat resisting magnesium-rare earth alloy for engine piston " (Shanghai, Shanghai Communications University, 2010)Bright, its room temperature elastic modelling quantity is only also about 45GPa, and its elastoresistance deformability is poor, and when room temperature and 300 DEG C, tensile strength is dividedWei 320MPa and 250MPa, can not meet the demand of engineering field to light-high-strength high elastic modulus magnesium alloy materials. CauseThis, the demand of research and development high-strength temperature-resistant casting magnesium alloy material has become very urgent.
From mixing rule, the intensity of heterogeneous alloy and elastic modelling quantity be consisting of the intensity of phase and elastic modelling quantity andIts volume fraction decision, introducing other compositions can affect the strong of parent metal to form alloying element or compound second-phaseDegree and elastic modelling quantity. Research in recent years finds can generate long-periodic structure phase (LPSO knot in some Mg-RE-Zn alloyStructure), LPSO structure has high rigidity, high-plasticity, high elastic modulus and the interface good with magnesium matrix and is combined etc. a series ofCharacteristic, this structure can significantly improve Alloy At Room Temperature and elevated temperature strength in not endangering alloy plasticity. Kawamura etc. existThe Rapidly delivering on " MaterialsTransactions " (material proceedings) calendar year 2001 the 42nd phase 1172-1176 pageSolidifiedPowderMetallurgyMg97Zn1Y2AlloyswithExcellentTensileYieldStrengthabove600MPa(Rapid Solidification Powder metallurgical technology preparation has 600MPa with upper yield strengthMg97Y2Zn1Alloy) research show, LPSO structure can significantly be improved the mechanical property of alloy, this alloy is at room temperature surrendered by forceDegree reaches 5% up to 610MPa, percentage elongation, has realized the superhigh intensity of magnesium alloy in keeping good plasticity. Leng etc. existOn " MaterialsScienceandEngineeringA " (Materials Science and Engineering) the 40th phase 38-45 page in 2012, send outThe MicrostructureandhighmechanicalpropertiesofMg – 9RY – 4Zn (RY:Y-rich of tableMischmetal) alloywithlongperiodstackingorderedphase(has the Mg – of LPSO structureMicrostructure and the strong mechanical performance of 9RY – 4Zn) report a kind of tough hot extrusion Mg-RY-Zn of high strength at high temperature containing LPSO phase(RY: yttrium-rich RE) alloy, 300 DEG C time, tensile strength still can remain on 300MPa left and right.
Meanwhile, Hu etc. is in " MaterialsScienceandEngineeringA " (Materials Science and Engineering) 2013The MicrostructuresandmechanicalpropertiesoftheMg – delivering on 24 pages of year the 571st phases 19 –Microstructure and the mechanical property of 8Gd – 4Y – Nd – Zn – 3Si (wt%) alloy(Mg – 8Gd – 4Y – Nd – Zn – 3Si alloy) researchShow, in magnesium alloy, add silicon (Si), can generate the Mg with high elastic modulus (120GPa) and heat resistance2Si, carriesThe high elastic modelling quantity of alloy. But, the interpolation of Si element also significantly reduces the mobility of alloy melt, worsens the casting of alloyPerformance, and the nascent Mg of thick dendroid2Si also grievous injury the mechanical property of alloy. In order to improve the property containing Si-Mg alloyCan, grain refinement and rotten processing are one of important approach. Conventional zirconium (Zr) fining agent of magnesium-rare earth is mainly at presentForm with binary Mg-Zr intermediate alloy adds. Through the literature search of prior art is found, Chinese invention patent number isThe patent of ZL200410020594.9 discloses a kind of production method of Mg-Zr intermediate alloy, and production technology is simple, processing ease.But, with Mg-Zr intermediate alloy form add that the method for Zr still exists that alloy impurity is higher, uneven components, gravity segregation, ZrThe problems such as loss is serious.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, provides a kind of high-strength temperature-resistant casting magnesium to closeGold and preparation method. It generates high elastic modulus by add Si in the Mg-Y-Zn alloy with high strength LPSO structureMg2Si hardening constituent, carries heavy alloyed elastic modelling quantity, meanwhile, adds K2ZrCl6-LiCl-CaF2Salt-mixture refinement α-Mg matrix, addsEnter Mg-B2O3Alterant is to the nascent Mg of thick dendroid2The Si processing of going bad, realizes α-Mg and Mg2The grain refinement of Si,And then carry out three-stage solution processing and Ageing Treatment, and then prepare high-strength temperature-resistant cast magnesium alloy.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of high-strength temperature-resistant cast magnesium alloy, its each component and mass percent thereof are: 2 ~ 8%Y, 1 ~ 4%Zn, 1 ~ 3%Si,0.3 ~ 0.7%Zr, 0.1 ~ 0.3%B, the total amount of Impurity Fe, Cu and Ni is less than 0.03%, and surplus is Mg.
A preparation method for high-strength temperature-resistant cast magnesium alloy, comprises smelting technology and Technology for Heating Processing, wherein meltsWhen sweetening process, Y adds with the form of Mg-25wt%Y intermediate alloy, and Zr is with K2ZrCl6-LiCl-CaF2The form of salt-mixture addsEnter, B is with Mg-B2O3Form add, Mg, Zn and Si add with the form of pure Mg, pure Zn and pure Si respectively.
Described smelting technology is at SF6And CO2Under mixed gas protected condition, carry out, step is as follows:
(1) batching: raw material adopts pure Mg, pure Zn, pure Si, Mg-25wt%Y intermediate alloy, K2ZrCl6-LiCl-CaF2MixSalt, Mg-B2O3, according to described mass percent batching;
(2) dry material: by pure Mg, pure Zn, pure Si, Mg-25wt%Y intermediate alloy, K2ZrCl6-LiCl-CaF2Salt-mixture andMg-B2O3200 ~ 220 DEG C of preheatings 2 ~ 4 hours;
(3) molten Mg and Si: adopt crucible electrical resistance furnace by the pure magnesium fusing after drying, after pure magnesium fusing, at 740 ~ 760 DEG CAdd pure silicon, and every 5 minutes to Melt Stirring once;
(4) add Zn and Y: in the magnesium liquid of 670 ~ 690 DEG C, add pure Zn, when magnesium liquid temp reaches after 720 ~ 740 DEG C, addMg-25wt%Y intermediate alloy;
(5) add Zr and B: be warming up to 760 ~ 780 DEG C after pure Mg, pure Si, pure Zn and Mg-25wt%Y melt completely time, addK2ZrCl6-LiCl-CaF2Salt-mixture and Mg-B2O3
(6) cast: treat K2ZrCl6-LiCl-CaF2Salt-mixture and Mg-B2O3Fusing, after stirring rises to magnesium liquid temp completely750 ~ 770 DEG C of insulations 25 minutes, are then cooled to 740 ~ 760 DEG C, constantly electrorefining 15 minutes, after refining, be warming up to 770 DEG C quietPut 25 minutes, after leaving standstill, after 720 ~ 740 DEG C, skim surface scum and cast, casting with mould be heated in advance 220 ~250℃。
The step of described Technology for Heating Processing is as follows: (1) three-stage solution processing: first to magnesium alloy 300 ~ 350 DEG C of middle temperatureBe incubated 1 hour, after taking-up, be placed in rapidly 80 DEG C of hot water and quench; Then 400 ~ 460 DEG C of insulations of inferior high temperature 4 hours, getGo out to be placed in rapidly 80 DEG C of hot water and to quench afterwards; Finally, 480 ~ 520 DEG C of insulations of high temperature 4 ~ 20 hours, after taking-up, be placed in rapidlyIn 80 DEG C of hot water, quench;
(2) Ageing Treatment: 200 ~ 240 DEG C of insulations 8 ~ 24 hours, after taking out, air cooling was to chamber to the alloy after solution treatmentTemperature.
Described K2ZrCl6-LiCl-CaF2The concrete composition of salt-mixture is 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2
Described Mg-B2O3Alterant, its concrete composition is 60wt%Mg-40wt%B2O3
The present invention adopts Y(yttrium) be the first constituent element, Y can make the solid solubility of Zn in Mg slightly reduce, and with Zn shapeBecome LPSO structure, but add too much Y can postpone the appearance at age-hardening peak, and then fall low-alloyed intensity, raise the cost,Therefore the content of Y selects to be controlled at 2 ~ 8wt%; The present invention adopts Zn(zinc) be the second constituent element, Zn add can with Mg and Y shapeBecome stable hardening constituent, and adjust casting character; The present invention adopts Si(silicon) be the 3rd constituent element, have the adding to generate of SiThe Mg of high elastic modulus2Si, has improved the elastic modelling quantity of alloy; The present invention adopts K2ZrCl6-LiCl-CaF2Salt-mixture is as carefullyAgent, not only can reach the thinning effect that adopts Mg-Zr intermediate alloy to reach as fining agent, and than Mg-Zr intermediate alloyProcess for refining is simple, and Zr element segregation is less, and recovery rate is high, and fade resistance is stronger, has further improved the intensity of alloy; ThisInvention adopts Mg-B2O3As alterant, significantly refinement Mg2Si particle, and modification effect is stable, has long-lasting, furtherImprove the elastic modelling quantity of alloy.
Beneficial effect of the present invention: (1) generates by add Si in the Mg-Y-Zn alloy with high strength LPSO structureThe Mg of high elastic modulus2Si hardening constituent, carries heavy alloyed elastic modelling quantity, meanwhile, adds K2ZrCl6-LiCl-CaF2Salt-mixture is thinChange α-Mg matrix, add Mg-B2O3Alterant is to the nascent Mg of thick dendroid2The Si processing of going bad, realize α-Mg andMg2The grain refinement of Si. (2) the present invention adopts K2ZrCl6-LiCl-CaF2Salt-mixture, as fining agent, not only can reach employingThe thinning effect that Mg-Zr intermediate alloy reaches as fining agent, and simpler than the process for refining of Mg-Zr intermediate alloy, Zr elementSegregation is less, and recovery rate is high, and fade resistance is stronger; (3) the present invention adopts Mg-B2O3As alterant, significantly refinementMg2Si particle, and modification effect is stable, has long-lasting; (4) three-stage solution processing of the present invention and Ageing Treatment canSo that LPSO structure is separated out more uniformly and is grown in alloy substrate, realize the regulation and control to LPSO physical dimension, be conducive toThe strengthening of alloy matrix; (5) adopt K2ZrCl6-LiCl-CaF2Salt-mixture (refinement α-Mg matrix) and Mg-B2O3Alterant (becomesMatter Mg2Si particle) as composite refining agent, not only can reach the refinement effect that adopts Mg-Zr intermediate alloy to reach as fining agentReally, and simpler than the process for refining of Mg-Zr intermediate alloy, Zr and B element segregation are less, and recovery rate is high, and fade resistance is stronger, fallsLow magnesium alloy production cost. Therefore, generate high resiliency by add Si in the Mg-Y-Zn alloy with high strength LPSO structureThe Mg of modulus2Si hardening constituent, carries heavy alloyed elastic modelling quantity, adds K simultaneously2ZrCl6-LiCl-CaF2Salt-mixture and Mg-B2O3DoFor composite crystal grain fining agent, significantly refinement alloy grain, and then prepare high-strength temperature-resistant cast magnesium alloy.
Detailed description of the invention
The present invention generates high elastic modulus by add Si in the Mg-Y-Zn alloy with high strength LPSO structureMg2Si hardening constituent, carries heavy alloyed elastic modelling quantity, meanwhile, adds K2ZrCl6-LiCl-CaF2Salt-mixture refinement α-Mg matrix, addsEnter Mg-B2O3Alterant is to the nascent Mg of thick dendroid2The Si processing of going bad, realizes α-Mg and Mg2The grain refinement of Si,And then carry out three-stage solution processing and Ageing Treatment, and then prepare high-strength temperature-resistant cast magnesium alloy.
The preparation method of a kind of high-strength temperature-resistant cast magnesium alloy involved in the present invention, it comprises smelting technology and heat treatmentTwo parts of technique:
Described smelting technology is at SF6And CO2Under mixed gas protected condition, carry out, step is as follows: (1) batching: raw material is adoptedWith pure Mg, pure Zn, pure Si, Mg-25wt%Y intermediate alloy, K2ZrCl6-LiCl-CaF2Salt-mixture, Mg-B2O3, according to described matterAmount percentage batching; (2) dry material: by pure Mg, pure Zn, pure Si, Mg-25wt%Y intermediate alloy, K2ZrCl6-LiCl-CaF2MixSalt and Mg-B2O3200 ~ 220 DEG C of preheatings more than 2 hours; (3) molten Mg and Si: adopt crucible electrical resistance furnace by molten the pure magnesium after dryingChange, after the fusing of pure magnesium, add pure silicon at 740 ~ 760 DEG C, and every 5 minutes to Melt Stirring once; (4) add Zn and Y: toward 670 ~In the magnesium liquid of 690 DEG C, add pure Zn, when magnesium liquid temp reaches after 720 ~ 740 DEG C, add Mg-25wt%Y intermediate alloy; (5) add ZrAnd B: add K be warming up to 760 ~ 780 DEG C after pure Mg, pure Si, pure Zn and Mg-25wt%Y melt completely time2ZrCl6-LiCl-CaF2Salt-mixture and Mg-B2O3; (6) cast: treat K2ZrCl6-LiCl-CaF2Salt-mixture and Mg-B2O3Fusing completely, will after stirringMagnesium liquid temp rises to 750 ~ 770 DEG C of insulations 25 minutes, is then cooled to 740 ~ 760 DEG C, and constantly electrorefining 15 minutes, rises after refiningTemperature to 770 DEG C leave standstill 25 minutes, leave standstill after after 720 ~ 740 DEG C, skim surface scum and cast, casting with mould in advanceBe heated to 220 ~ 250 DEG C.
Described Technology for Heating Processing comprises three-stage solution processing and Ageing Treatment, and wherein, three-stage solution is treated to: first to magnesiumAlloy, 300 ~ 350 DEG C of insulations of middle temperature 1 hour, is placed in rapidly 80 DEG C of hot water and quenches after taking-up; Then at inferior high temperature 400~ 460 DEG C are incubated 4 hours, are placed in rapidly 80 DEG C of hot water and quench after taking-up; Finally in 480 ~ 520 DEG C of insulations 4 ~ 20 of high temperatureHour, after taking-up, be placed in rapidly 80 DEG C of hot water and quench; Ageing Treatment is: to the alloy after solution treatment 200 ~ 240DEG C insulation 8 ~ 24 hours, take out after air cooling to room temperature.
In preparation method of the present invention, described K2ZrCl6-LiCl-CaF2Salt-mixture, its concrete composition is 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2; Described Mg-B2O3Alterant, its concrete composition is 60wt%Mg-40wt%B2O3
Below in conjunction with specific embodiment, the present invention is elaborated, described embodiment is taking technical solution of the present invention as prerequisiteUnder provided detailed enforcement mode and concrete operating process, but protection scope of the present invention is not limited only to following enforcementExample.
Embodiment 1
Component and the mass percent thereof of the high-strength temperature-resistant cast magnesium alloy of the present embodiment are: 2wt%Y, 1wt%Zn, 3wt%Si, 0.3wt%Zr, 0.3wt%B, the total amount of Impurity Fe, Cu and Ni is less than 0.03wt%, and surplus is Mg.
The preparation method of the magnesium alloy of the present embodiment comprises smelting technology and two parts of Technology for Heating Processing.
Described smelting technology is at SF6And CO2Under mixed gas protected condition, carry out, step is as follows: (1) batching: raw material adoptsPure Mg, pure Zn, pure Si, Mg-25wt%Y intermediate alloy, 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture, 60wt%Mg-40wt%B2O3, according to described mass percent batching; (2) dry material: will in the middle of pure Mg, pure Zn, pure Si, Mg-25wt%Y, closeGold, 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture and 60wt%Mg-40wt%B2O3200 DEG C of preheatings 2 hours;(3) molten Mg and Si: adopt crucible electrical resistance furnace by the pure magnesium fusing after drying, after pure magnesium ingot fusing, add pure silicon at 740 DEG C,And every 5 minutes to Melt Stirring once; (4) add Zn and Y: in the magnesium liquid of 670 DEG C, add pure Zn, when magnesium liquid temp reaches 720After DEG C, add Mg-25wt%Y intermediate alloy; (5) add Zr and B: after pure Mg, pure Si, pure Zn and Mg-25wt%Y melt completely, riseTemperature adds 60wt%K during to 760 DEG C2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture and 60wt%Mg-40wt%B2O3; (6) waterNote: treat 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture and 60wt%Mg-40wt%B2O3Fusing completely, will after stirringMagnesium liquid temp rises to 750 DEG C of insulations 25 minutes, is then cooled to 740 DEG C, and constantly electrorefining 15 minutes, is warming up to 770 after refiningDEG C leave standstill 25 minutes, after leaving standstill, skim surface scum and cast after 720 DEG C, casting is heated to 220 DEG C in advance with mould;
Described Technology for Heating Processing comprises three-stage solution processing and Ageing Treatment, and wherein, three-stage solution is treated to: first to magnesiumAlloy, 300 DEG C of insulations of middle temperature 1 hour, is placed in rapidly 80 DEG C of hot water and quenches after taking-up; Then 400 DEG C of guarantors of inferior high temperatureTemperature 4 hours, is placed in rapidly 80 DEG C of hot water and quenches after taking-up; Finally 480 DEG C of insulations of high temperature 20 hours, rapid after taking outBeing placed in 80 DEG C of hot water quenches; Ageing Treatment is: 240 DEG C of insulations 8 hours, empty after taking out to the alloy after solution treatmentBe chilled to room temperature.
The room-temperature mechanical property of this high-strength temperature-resistant cast magnesium alloy T6 state is:
Tensile strength: 350MPa, yield strength: 240MPa, percentage elongation: 3.2%, elastic modelling quantity: 52GPa.
When 300 DEG C of this high-strength temperature-resistant cast magnesium alloy T6 state, mechanical property is:
Tensile strength: 300MPa, yield strength: 210MPa, percentage elongation: 12%, elastic modelling quantity: 47GPa.
Embodiment 2
Component and the mass percent thereof of the high-strength temperature-resistant cast magnesium alloy of the present embodiment are: 8%Y, 4%Zn, 1%Si, 0.7%Zr, 0.1%B, the total amount of Impurity Fe, Cu and Ni is less than 0.03%, and surplus is Mg.
The preparation method of the magnesium alloy of the present embodiment comprises smelting technology and two parts of Technology for Heating Processing.
Described smelting technology is at SF6And CO2Under mixed gas protected condition, carry out, step is as follows: (1) batching: raw material adoptsPure Mg, pure Zn, pure Si, Mg-25wt%Y intermediate alloy, 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture, 60wt%Mg-40wt%B2O3, according to described mass percent batching; (2) dry material: in the middle of pure Mg, pure Zn, pure Si, Mg-25wt%YAlloy, 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture and 60wt%Mg-40wt%B2O3220 DEG C of preheatings 3 hours;(3) molten Mg and Si: adopt crucible electrical resistance furnace by the pure magnesium fusing after drying, after pure magnesium ingot fusing, add pure silicon at 760 DEG C,And every 5 minutes to Melt Stirring once; (4) add Zn and Y: in the magnesium liquid of 690 DEG C, add pure Zn, when magnesium liquid temp reaches 740After DEG C, add Mg-25wt%Y intermediate alloy; (5) add Zr and B: after pure Mg, pure Si, pure Zn and Mg-25wt%Y melt completely, riseTemperature adds 60wt%K during to 780 DEG C2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture and 60wt%Mg-40wt%B2O3; (6) waterNote: treat 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture and 60wt%Mg-40wt%B2O3Fusing completely, will after stirringMagnesium liquid temp rises to 770 DEG C of insulations 25 minutes, is then cooled to 760 DEG C, and constantly electrorefining 15 minutes, is warming up to 770 after refiningDEG C leave standstill 25 minutes, after leaving standstill, skim surface scum and cast after 740 DEG C, casting is heated to 250 DEG C in advance with mould;
Described Technology for Heating Processing comprises three-stage solution processing and Ageing Treatment, and wherein, three-stage solution is treated to: first to magnesiumAlloy, 350 DEG C of insulations of middle temperature 1 hour, is placed in rapidly 80 DEG C of hot water and quenches after taking-up; Then 460 DEG C of guarantors of inferior high temperatureTemperature 4 hours, is placed in rapidly 80 DEG C of hot water and quenches after taking-up; Finally 520 DEG C of insulations of high temperature 4 hours, rapid after taking outBeing placed in 80 DEG C of hot water quenches; Ageing Treatment is: the alloy after solution treatment is incubated to 24 hours at 200 DEG C, after taking-upAir cooling is to room temperature.
The room-temperature mechanical property of this high-strength temperature-resistant cast magnesium alloy T6 state is:
Tensile strength: 370MPa, yield strength: 260MPa, percentage elongation: 2.5%, elastic modelling quantity: 59GPa.
When 300 DEG C of this high-strength temperature-resistant cast magnesium alloy T6 state, mechanical property is:
Tensile strength: 320MPa, yield strength: 220MPa, percentage elongation: 10%, elastic modelling quantity: 50GPa.
Embodiment 3
Component and the mass percent thereof of the high-strength temperature-resistant cast magnesium alloy of the present embodiment are: 5%Y, 2.5%Zn, 2%Si,0.5%Zr, 0.2%B, the total amount of Impurity Fe, Cu and Ni is less than 0.03%, and surplus is Mg.
The preparation method of the magnesium alloy of the present embodiment comprises smelting technology and two parts of Technology for Heating Processing.
Described smelting technology is at SF6And CO2Under mixed gas protected condition, carry out, step is as follows: (1) batching: raw material is adoptedWith pure Mg, pure Zn, pure Si, Mg-25wt%Y intermediate alloy, 60wt%
K2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture, 60wt%Mg-40wt%B2O3, according to described quality percentageThan batching; (2) dry material: by pure Mg, pure Zn, pure Si, Mg-25wt%Y intermediate alloy, 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture and 60wt%Mg-40wt%B2O3210 DEG C of preheatings 4 hours; (3) molten Mg and Si: adopt crucible electrical resistance furnaceBy the pure magnesium fusing after drying, after pure magnesium ingot fusing, add pure silicon at 750 DEG C, and every 5 minutes to Melt Stirring once; (4)Add Zn and Y: in the magnesium liquid of 680 DEG C, add pure Zn, when magnesium liquid temp reaches after 730 DEG C, add Mg-25wt%Y intermediate alloy;(5) add Zr and B: be warming up to 770 DEG C after pure Mg, pure Si, pure Zn and Mg-25wt%Y melt completely time, add 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture and 60wt%Mg-40wt%B2O3; (6) cast: treat 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2Salt-mixture and 60wt%Mg-40wt%B2O3Fusing, rises to 760 DEG C by magnesium liquid temp after stirring completelyBe incubated 25 minutes, be then cooled to 750 DEG C, constantly electrorefining 15 minutes, is warming up to 770 DEG C and leaves standstill 25 minutes after refining, leave standstillAfter after 730 DEG C, skim surface scum and cast, casting is heated to 235 DEG C in advance with mould;
Described Technology for Heating Processing comprises three-stage solution processing and Ageing Treatment, and wherein, three-stage solution is treated to: first to magnesiumAlloy, 325 DEG C of DEG C of insulations of middle temperature 1 hour, is placed in rapidly 80 DEG C of hot water and quenches after taking-up; Then 430 DEG C of inferior high temperatureDEG C insulation 4 hours, after taking-up, be placed in rapidly 80 DEG C of hot water and quench; Finally, 500 DEG C of DEG C of insulations of high temperature 12 hours, take outBeing placed in rapidly afterwards 80 DEG C of hot water quenches; Ageing Treatment is: the alloy after solution treatment is incubated to 16 hours at 220 DEG C,After taking out, air cooling is to room temperature.
The room-temperature mechanical property of this high-strength temperature-resistant cast magnesium alloy T6 state is:
Tensile strength: 360MPa, yield strength: 247MPa, percentage elongation: 3.3%, elastic modelling quantity: 62GPa.
When 300 DEG C of this high-strength temperature-resistant cast magnesium alloy T6 state, mechanical property is:
Tensile strength: 315MPa, yield strength: 212MPa, percentage elongation: 14%, elastic modelling quantity: 52GPa.

Claims (4)

1. a high-strength temperature-resistant cast magnesium alloy, is characterized in that: each component and the mass percent thereof of described cast magnesium alloyFor: 2 ~ 8%Y, 1 ~ 4%Zn, 1 ~ 3%Si, 0.3 ~ 0.7%Zr, 0.1 ~ 0.3%B, the total amount of Impurity Fe, Cu and Ni is less than 0.03%,Surplus is Mg; The preparation method of described high-strength temperature-resistant cast magnesium alloy, comprises smelting technology and Technology for Heating Processing, wherein carries outWhen smelting technology, Y adds with the form of Mg-25wt%Y intermediate alloy, and Zr is with K2ZrCl6-LiCl-CaF2The form of salt-mixture addsEnter, B is with Mg-B2O3Form add, Mg, Zn and Si add with the form of pure Mg, pure Zn and pure Si respectively; Described heat treatment workThe step of skill is as follows:
(1) three-stage solution processing: first magnesium alloy is incubated to 1 hour 300 ~ 350 DEG C of middle temperature, is placed in rapidly 80 DEG C of heat after taking-upIn water, quench; Then 400 ~ 460 DEG C of insulations of inferior high temperature 4 hours, after taking-up, be placed in rapidly 80 DEG C of hot water and quench;Finally, 480 ~ 520 DEG C of insulations of high temperature 4 ~ 20 hours, after taking-up, be placed in rapidly 80 DEG C of hot water and quench;
(2) Ageing Treatment: 200 ~ 240 DEG C of insulations 8 ~ 24 hours, after taking out, air cooling was to room temperature to the alloy after solution treatment.
2. high-strength temperature-resistant cast magnesium alloy according to claim 1, is characterized in that:
Described smelting technology is at SF6And CO2Under mixed gas protected condition, carry out, step is as follows:
(1) batching: raw material adopts pure Mg, pure Zn, pure Si, Mg-25wt%Y intermediate alloy, K2ZrCl6-LiCl-CaF2Salt-mixture,Mg-B2O3, according to described mass percent batching;
(2) dry material: by pure Mg, pure Zn, pure Si, Mg-25wt%Y intermediate alloy, K2ZrCl6-LiCl-CaF2Salt-mixture and Mg-B2O3200 ~ 220 DEG C of preheatings 2 ~ 4 hours;
(3) molten Mg and Si: adopt crucible electrical resistance furnace by the pure magnesium fusing after drying, after pure magnesium fusing, 740 ~ 760 DEG C of conditionsUnder add pure silicon, and every 5 minutes to Melt Stirring once, obtain magnesium liquid;
(4) add Zn and Y: be to add pure Zn under the condition of 670 ~ 690 DEG C at magnesium liquid temp, when magnesium liquid temp reaches 720 ~ 740 DEG CAfter, add Mg-25wt%Y intermediate alloy;
(5) add Zr and B: be warming up to 760 ~ 780 DEG C after pure Mg, pure Si, pure Zn and Mg-25wt%Y melt completely time, addK2ZrCl6-LiCl-CaF2Salt-mixture and Mg-B2O3, obtain mixed liquor;
(6) cast: treat K2ZrCl6-LiCl-CaF2Salt-mixture and Mg-B2O3Fusing, after stirring rises to mixeding liquid temperature completely750 ~ 770 DEG C of insulations 25 minutes, are then cooled to 740 ~ 760 DEG C, constantly electrorefining 15 minutes, after refining, be warming up to 770 DEG C quietPut 25 minutes, leave standstill after after 720 ~ 740 DEG C, skim surface scum and cast, obtain magnesium alloy, casting with mould in advanceBe heated to 220 ~ 250 DEG C.
3. high-strength temperature-resistant cast magnesium alloy according to claim 1, is characterized in that: described K2ZrCl6-LiCl-CaF2MixedThe concrete composition that closes salt is 60wt%K2ZrCl6-20wt%LiCl-20wt%CaF2
4. high-strength temperature-resistant cast magnesium alloy according to claim 1, is characterized in that: described Mg-B2O3Concrete composition be60wt%Mg-40wt%B2O3
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