CN104561691B - High-plasticity cast aluminum alloy and pressure casting preparation method thereof - Google Patents

High-plasticity cast aluminum alloy and pressure casting preparation method thereof Download PDF

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CN104561691B
CN104561691B CN201510039611.1A CN201510039611A CN104561691B CN 104561691 B CN104561691 B CN 104561691B CN 201510039611 A CN201510039611 A CN 201510039611A CN 104561691 B CN104561691 B CN 104561691B
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aluminium
melt
cast aluminum
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CN104561691A (en
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王渠东
隋育栋
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Shanghai Jiaotong University
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making non-ferrous alloys
    • C22C1/02Making non-ferrous alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making non-ferrous alloys
    • C22C1/02Making non-ferrous alloys by melting
    • C22C1/03Making non-ferrous alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making non-ferrous alloys
    • C22C1/06Making non-ferrous alloys with the use of special agents for refining or deoxidising

Abstract

The invention discloses a high-plasticity cast aluminum alloy and a pressure casting preparation method thereof, belonging to the technical fields of metal materials and metallurgy. The high-plasticity cast aluminum alloy comprises the following components in percentage by weight: 7.5-14.5% of Si, 0.5-0.8% of Mg, 0.2-0.5% of Mn, 0.1-0.4% of Ti, 0.01-1.5% of RE, 0.6-1.3% of Fe, at most 100 ppm of P, 100-600 ppm of Sr and the balance of Al. The RE is one or more of Gd, Y, Nd, Sm, Er, Yb and La. After the high-plasticity cast aluminum alloy is subjected to pressure casting, the elongation percentage delta of the alloy is greater than or equal to 20%. The alloy has the advantages of excellent casting performance and low cost. The method has the advantages of simple technique, high production efficiency and obvious progress, and widens the application range of the Al-Si cast aluminum alloy.

Description

High plasticity alloy cast aluminum and its compression casting preparation method
Technical field
The present invention relates to a kind of cast aluminium alloy gold and preparation method thereof, specifically a kind of high plasticity alloy cast aluminum and Its compression casting preparation method, belongs to class of metal materials and field of metallurgy.
Background technology
Cast aluminium alloy gold as traditional metal material, because the features such as its density is little, specific strength is high, being widely used in navigating The industries such as sky, space flight, automobile, machinery.With the development of modern industry and casting technology, to cast aluminium alloy gold, such as there is height Intensity, the cast aluminium alloy gold of high-ductility, excellent wearability and corrosion resistance, demand is increasing.Through sending out of decades Exhibition, high-strength aluminum alloy has formed complete series, and performance tends towards stability, and production method is gradually improved, and becomes in Material Field not The alloy system that can or lack.But the plasticity of current high strength cast aluminum alloys is relatively low, typically can not bear larger deflection, from And so that it is applied and limited by larger.Many needs to adopt wrought aluminium alloy manufacture the vitals of high-ductility more.But become Although shape aluminium alloy has preferable high-ductility, its course of processing has high demands to equipment and moulds of industrial equipment, and operation is many, therefore raw The product cycle is long, and cost is very high.By contrast, cast aluminium alloy gold has cheap, cast structure isotropism, easily produces shape The complicated part of shape, many advantages, such as both can also be able to being produced in enormous quantities with single-piece production.Therefore, exploitation can replace part to become Shape aluminium alloy simultaneously has the cast aluminium alloy gold of high-ductility, and its cast shaping process of specification shortens the production cycle, reduction is manufactured into This, become the current development trend in this field.
Chinese patent cn85102364aa discloses a kind of Si-Mn-Te series aluminum casting alloy, and its component content is 5.5~9.5%si, 0.2~0.8%mn, 0.1~0.2%ti, 0.001~0.2%te, 0.1~0.2%sb, balance of al, Elongation percentage is 16% about.But, while improving plasticity, alloy strength acutely declines this alloy, its performance nor full The industrial at present needs of foot.In Chinese patent cn101248200a, disclose a kind of cast aluminium alloy gold, its component content For 2.5~3.3%si, 0.2~0.7%mg, fe < 0.18%, mn < 0.5, ti < 0.1, sr < 0.03, other < 0.1, remaining Measure as al.After during this alloy as-cast condition, elongation percentage is 13%, t6 heat treatment, elongation percentage is only 5%, does not much reach high-ductility The application demand of Casting Aluminum Alloy Based.Further, since si amount is relatively low in alloy, in tissue the eutectic scale of construction less so that alloy Forming temperature is higher, air-breathing tendency is larger, there is the casting flaws such as the pore being difficult to avoid that, shrinkage cavity and shrinkage porosite it is difficult to obtain high Sound casting, thus mouldability (casting character) is poor.In Chinese patent cn103305730a, disclose a kind of new al- Si-mg-cu-sr casting alloy, its component content is 11.0~12.0%si, 0.30~0.50%cu, 0.35~0.55%mg, 0.01~0.02%sr, mn≤0.35%, zn≤0.20%, fe≤0.40%, ti≤0.10%, ni≤0.10%, pb≤ 0.10%, sn≤0.10%, cr≤0.10%, other≤0.6%, balance of al.The as cast condition tensile strength of this alloy 245~ Between 275mpa, elongation percentage is between 5~8%.But, the cu element adding in this al-si system alloy can increase the heat of alloy Split and corrosion tendency, reduce casting character, therefore limit this alloy range of application in the industry.
Content of the invention
It is generally low and do not account for aluminium alloy that the present invention is directed to the cast aluminium alloy gold plasticity that prior art exists The deficiency of casting character.On the basis of not reducing alloy strength and casting character, there is provided a kind of high plasticity alloy cast aluminum And its compression casting preparation method, by selecting suitable composition and technological parameter, prepare the casting with excellent elongation percentage Aluminium alloy.
The purpose of the present invention is achieved through the following technical solutions:
In a first aspect, the present invention provides a kind of high plasticity alloy cast aluminum, as follows including component and weight content: si 7.5 ~14.5%, mg 0.5~0.8%, mn 0.2~0.5%, ti 0.1~0.4%, re 0.01~1.5%, fe 0.6~ 1.3%, p≤100ppm, sr 100~600ppm, balance of al;
Preferably, described re is one or more of gd, y, nd, sm, er, yb, la.
Preferably, when described re is one or more of gd, er or yb, the weight content of re is 0.05~1.0%;Institute Stating re is one or more of y, nd, sm or la, then the preferred version of these four rare earth elements is 0.05~0.6%.
Preferably, p is 1~50ppm.
Preferably, described si, mg, mn, ti, re, fe, p, sr, al are derived from commercial-purity aluminium, silicon metal, pure magnesium, al- Mn intermediate alloy, rare earth intermediate alloy, al-sr intermediate alloy, al-p intermediate alloy and al-ti-b intermediate alloy.
Second aspect, the present invention provide a kind of compression casting preparation method of described high plasticity alloy cast aluminum, including with Lower step:
The first step, molten alloy, obtain aluminium alloy melt;
Second step, carries out compression casting to described aluminium alloy melt, obtains final product high plasticity alloy cast aluminum.
Preferably, in the first step, described molten alloy comprises the steps:
(1) close in the middle of commercial-purity aluminium, silicon metal, pure magnesium, al-mn intermediate alloy, rare earth intermediate alloy, al-sr Gold, al-p intermediate alloy and al-ti-b intermediate alloy are preheated to 100~200 DEG C, are incubated more than 2 hours;
(2) melting al, si: preheating melting utensil, to 400~500 DEG C, adds silicon metal in its bottom, on silicon metal The 40~80% of commercial-purity aluminium gross weight needed for covering, are warming up to the temperature of commercial-purity aluminium fusing, obtain aluminium liquid;Silicon metal is in aluminium liquid Parcel under melt, repeatedly stir after fusing, add remaining commercial-purity aluminium;
(3) plus mn, re: under the conditions of 720~740 DEG C, add al-mn intermediate alloy, dilute in step (2) gained liquation Native intermediate alloy;
Plus sr, p (4): under the conditions of 730~750 DEG C, add in step (3) gained liquation al-sr intermediate alloy and Al-p intermediate alloy, standing stirs 3~5 minutes after 15~30 minutes so as to abundant melt;
(5) add ti: under the conditions of 710~730 DEG C, add al-ti-b intermediate alloy in step (4) gained liquation, stir Mix, stand 3~5 minutes;
(6) add mg: under the conditions of 700~720 DEG C, add pure magnesium in step (5) gained liquation, fully melt;
(7) refine: under the conditions of 710~740 DEG C, add refining agent, 10~20 points of refine in step (6) gained liquation Clock, stands 15~40 minutes, is cooled to 660~700 DEG C, skims surface scum, obtain final product aluminium alloy melt.
Preferably, in step (1), described preheating specially adopts baking oven.
Preferably, in step (2), described smelting device is specially crucible;The temperature of commercial-purity aluminium fusing is on 680 DEG C of left sides Right;Described stirring adopts graphite rod.
Preferably, in step (7), described refining agent is the aluminium alloy that conventional commercial contains the inorganic salts such as sodium salt, potassium salt, villiaumite Refining agent or hexachlorethane, its consumption is less than or equal to the 5% of described high plasticity alloy cast aluminum weight.
Preferably, in second step, in described compression casting, the pouring temperature of aluminium alloy melt is 660~700 DEG C, injection Speed is 0.2~3.0m/s, and casting mould preheating temperature is 200~300 DEG C.
When rare earth adding quantity is different, rare earth is main in aluminium alloy to be existed with three kinds of forms: solid solution in the base, segregation In phase boundary, crystal boundary and dendrite circle, it is solid-solubilized in compound or is existed with compound form.After adding rare earth element in the alloy, Rare earth one side plays limited solid solution strengthening, improves the effect of intensity, and another aspect Rare-Earth Element Chemistry activity is extremely strong, Ke Yi Selective absorption on the crystal grain boundary grown up, hinders the growth of crystal grain, crystal grain thinning, puies forward heavy alloyed mechanical property, especially Plasticity.When increasing the content of rare earth further, the intermetallic compound Dispersed precipitate that rare earth is formed with the element such as al, mg, si In matrix, during making alloy fracture, crack initiation position is changed with extension approach, puies forward heavy alloyed plasticity.Rare earth unit The addition of element can also improve the casting character of cast aluminium alloy gold, this is because fe is harmful impurity in aluminium alloy, great majority The crystalline structure of Copper component is all very thick, directly affects the mechanical performance of alloy, drops low-alloyed mobility and plasticity, increases Structural heterogenity, adds rare earth, then can change the existing forms of iron phase, put forward heavy alloyed casting character and its plasticity.Separately Outward, p and sr can effectively put forward heavy alloyed plasticity to the rotten of primary crystal si and eutectic si.
Compared with prior art, the present invention has a following beneficial effect:
(1) add rare earth element in cast aluminium alloy gold of the present invention, by the tune of optimizing components and series of process parameter Whole, obtain that crystal grain is tiny, fine and close, composition uniformly, Dispersed precipitate in the rich re intermetallic compound of matrix and lack flawless group Knit, its plasticity can be significantly improved on the basis of not reducing alloy strength, can preferably meet industrial service demand;
(2) aluminium alloy according to present component extrusion casint preparation, compared with existing al-si system alloy, its room temperature is strong Degree does not substantially reduce but plasticity obtains and is greatly improved, and the foundry goods of die casting tests its room temperature tensile intensity σ >=280mpa, elongation percentage δ >=20%, breaches that other al-si system cast aluminium alloy gold intensity are higher but the relatively low bottleneck of plasticity, its higher intensity and prolonging The rate of stretching can meet the demand to such material for the industry;
(3) the alloy casting character of present invention preparation is excellent, with low cost, process is simple, and production efficiency is high, progressive aobvious Write, expand the range of application of al-si system cast aluminium alloy gold.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this area For personnel, without departing from the inventive concept of the premise, some deformation can also be made and improve.These broadly fall into the present invention Protection domain.In the present invention, involved various intermediate alloys and refining agent are commercially available prod.
Embodiment 1
The present embodiment is related to a kind of high plasticity alloy cast aluminum and its compression casting preparation method.
In a first aspect, the present embodiment provides a kind of high plasticity alloy cast aluminum, described al alloy component (weight content) is: 7.5%si, 0.5%mg, 0.2%mn, 0.1%ti, 0.05%y, 0.6%fe, 20ppm p, 100ppm sr, other can not be kept away The impurity exempted from is less than 0.2%, and remaining is al.
Second aspect, the present embodiment provides a kind of compression casting preparation method of described high plasticity alloy cast aluminum, including Following steps:
The first step, molten alloy, obtain aluminium alloy melt;Wherein, the technique of described molten alloy concretely comprises the following steps: (1) Melting raw material is preheated to 100 DEG C in an oven, is incubated more than 2 hours, the rust cleaning of the surface clean such as Slag Tool, bell jar is coated Coating, this coating adds appropriate water mediation to form using 25% Pulvis Talci and 5% waterglass, then is placed in the baking of stove surface, dries Roasting temperature is 100 DEG C, and baking was cleared up, to prevent increasing ferrum in fusion process for the alloy after 1 hour;(2) preheated crucible is to 400 DEG C, add silicon metal in crucible bottom, cover 2/3 of required fine aluminium amount after drying on silicon metal, heat up together, fine aluminium exists 680 DEG C about melt, silicon slowly melts under the parcel of aluminium liquid, is repeatedly stirred with graphite rod after fusing, adds remaining fine aluminium; (3) it is cooled to 730 DEG C and adds al-mn intermediate alloy, al-5y intermediate alloy, stirring makes it be completely melt;(4) it is warming up to 740 DEG C Add al-sr intermediate alloy and al-p intermediate alloy, stand 15 minutes;(5) it is cooled to 710 DEG C of addition al-ti-b intermediate alloys, Stirring, stands 3~5 minutes;(6), in the pure magnesium press-in aluminum alloy melt being wrapped up aluminium foil with bell jar when 700 DEG C, stirring makes it fill Fractional melting;(7) it is warming up to when 720 DEG C and carries out refine, refining agent selects the three-in-one refining agent of aluminium alloy, the addition of refining agent is The refining agent that aluminium foil wraps up is pressed into horizontal turning movement, about 10min in aluminium liquid with bell jar during refine by the 1% of aluminium alloy gross weight The content of hydrogen is surveyed in refine after finishing, and carries out stokehold inspection;
Second step, stands 20min under 660 DEG C of pouring temperature, skims surface scum, obtains aluminium alloy melt, cast Prepare;Aluminium alloy melt temperature is kept to be 660 DEG C, mold temperature is 200 DEG C, injection speed 0.2m/s.
The high-plasticity aluminum alloy room temperature tensile intensity of die casting in the present embodiment is 282mpa, elongation percentage 20.3%.
Embodiment 2
The present embodiment is related to a kind of high plasticity alloy cast aluminum and its compression casting preparation method.
In a first aspect, the present embodiment provides a kind of high plasticity alloy cast aluminum, described al alloy component (weight content) is: 8.5%si, 0.6%mg, 0.3%mn, 0.2%ti, 1.5%gd, 0.7%fe, 40ppm p, 200ppm sr, other can not be kept away The impurity exempted from is less than 0.2%, and remaining is al.
Second aspect, the present embodiment provides a kind of compression casting preparation method of described high plasticity alloy cast aluminum, including Following steps:
The first step, molten alloy, obtain aluminium alloy melt;Wherein, the technique of described molten alloy concretely comprises the following steps: (1) Melting raw material is preheated to 200 DEG C in an oven, is incubated more than 2 hours, the rust cleaning of the surface clean such as Slag Tool, bell jar is coated Coating, this coating adds appropriate water mediation to form using 25% Pulvis Talci and 5% waterglass, then is placed in the baking of stove surface, dries Roasting temperature is 200 DEG C, and baking was cleared up, to prevent increasing ferrum in fusion process for the alloy after 1 hour;(2) preheated crucible is to 450 DEG C, add silicon metal in crucible bottom, cover 2/3 of required fine aluminium amount after drying on silicon metal, heat up together, fine aluminium exists 680 DEG C about melt, silicon slowly melts under the parcel of aluminium liquid, is repeatedly stirred with graphite rod after fusing, adds remaining fine aluminium; (3) it is cooled to 720 DEG C and adds al-mn intermediate alloy, mg-90gd intermediate alloy, stirring makes it be completely melt;(4) it is warming up to 730 DEG C add al-sr intermediate alloy and al-p intermediate alloy, stand 15 minutes;(5) it is cooled to 720 DEG C and add conjunction in the middle of al-ti-b Gold, stirring, stand 3~5 minutes;(6), in the pure magnesium press-in aluminum alloy melt being wrapped up aluminium foil with bell jar when 710 DEG C, stirring makes It fully melts;(7) it is warming up to when 730 DEG C and carries out refine, refining agent selects hexachlorethane, and the addition of refining agent is aluminium alloy The refining agent that aluminium foil wraps up is pressed into horizontal turning movement in aluminium liquid with bell jar during refine, about 10min refine is complete by the 1% of gross weight Survey the content of hydrogen after finishing, and carry out stokehold inspection;
Second step, stands 30min under 680 DEG C of pouring temperature, skims surface scum, obtains aluminium alloy melt, cast Prepare;Aluminium alloy melt temperature is kept to be 680 DEG C, mold temperature is 225 DEG C, injection speed 0.5m/s.
The high-plasticity aluminum alloy room temperature tensile intensity of die casting in the present embodiment is 286mpa, elongation percentage 20.0%.
Embodiment 3
The present embodiment is related to a kind of high plasticity alloy cast aluminum and its compression casting preparation method.
In a first aspect, the present invention provides a kind of high plasticity alloy cast aluminum, described al alloy component (weight content) is: 9.5%si, 0.7%mg, 0.4%mn, 0.3%ti, 0.1%gd, 0.1%y, 0.02%nd, 0.8%fe, 60ppm p, 300ppmsr, other inevitable impurity are less than 0.2%, and remaining is al.
Second aspect, the present embodiment provides a kind of compression casting preparation method of described high plasticity alloy cast aluminum, including Following steps:
The first step, molten alloy, obtain aluminium alloy melt;Wherein, the technique of described molten alloy concretely comprises the following steps: (1) Melting raw material is preheated to 200 DEG C in an oven, is incubated more than 2 hours, the rust cleaning of the surface clean such as Slag Tool, bell jar is coated Coating, this coating adds appropriate water mediation to form using 25% Pulvis Talci and 5% waterglass, then is placed in the baking of stove surface, dries Roasting temperature is 200 DEG C, and baking was cleared up, to prevent increasing ferrum in fusion process for the alloy after 1 hour;(2) preheated crucible is to 500 DEG C, add silicon metal in crucible bottom, cover 2/3 of required fine aluminium amount after drying on silicon metal, heat up together, fine aluminium exists 680 DEG C about melt, silicon slowly melts under the parcel of aluminium liquid, is repeatedly stirred with graphite rod after fusing, adds remaining fine aluminium; (3) it is cooled to 730 DEG C and add conjunction in the middle of al-mn intermediate alloy, mg-90gd intermediate alloy, mg-25y intermediate alloy, mg-90nd Gold, stirring makes it be completely melt;(4) it is warming up to 740 DEG C and adds al-sr intermediate alloy and al-p intermediate alloy, stand 15 minutes; (5) it is cooled to 730 DEG C of addition al-ti-b intermediate alloys, stirring, stand 3~5 minutes;(6) when 720 DEG C with bell jar by aluminium foil In the pure magnesium press-in aluminum alloy melt of parcel, stirring makes it fully melt;(7) it is warming up to and carried out with aluminum refining agent when 740 DEG C Refine, the addition of refining agent is the 2% of aluminium alloy gross weight, with bell jar, the refining agent that aluminium foil wraps up is pressed in aluminium liquid during refine Horizontal turning movement, the content of hydrogen is surveyed in about 10min refine after finishing, and carries out stokehold inspection;
Second step, stands 30min under 700 DEG C of pouring temperature, skims surface scum, obtains aluminium alloy melt, cast Prepare;Aluminium alloy melt temperature is kept to be 700 DEG C, mold temperature is 250 DEG C, injection speed 1.0m/s.
The high-plasticity aluminum alloy room temperature tensile intensity of die casting in the present embodiment is 286mpa, elongation percentage 20.2%.
Embodiment 4
The present embodiment is related to a kind of high plasticity alloy cast aluminum and its compression casting preparation method.
In a first aspect, the present invention provides a kind of high plasticity alloy cast aluminum, described al alloy component (weight content) is: 10.5%si, 0.8%mg, 0.5%mn, 0.4%ti, 0.2%gd, 0.3%y, 0.15%nd, 0.02%sm, 0.9%fe, 80ppm p, 400ppm sr, other inevitable impurity are less than 0.2%, and remaining is al.
Second aspect, the present embodiment provides a kind of compression casting preparation method of described high plasticity alloy cast aluminum, including Following steps:
The first step, molten alloy, obtain aluminium alloy melt;Wherein, the technique of described molten alloy concretely comprises the following steps: (1) Melting raw material is preheated to 200 DEG C in an oven, is incubated more than 2 hours, the rust cleaning of the surface clean such as Slag Tool, bell jar is coated Coating, this coating adds appropriate water mediation to form using 25% Pulvis Talci and 5% waterglass, then is placed in the baking of stove surface, dries Roasting temperature is 220 DEG C, and baking was cleared up, to prevent increasing ferrum in fusion process for the alloy after 1 hour;(2) preheated crucible is to 400 DEG C, add silicon metal in crucible bottom, cover 2/3 of required fine aluminium amount after drying on silicon metal, heat up together, fine aluminium exists 680 DEG C about melt, silicon slowly melts under the parcel of aluminium liquid, is repeatedly stirred with graphite rod after fusing, adds remaining fine aluminium; (3) it is cooled to 720 DEG C and add conjunction in the middle of al-mn intermediate alloy, mg-90gd intermediate alloy, al-5y intermediate alloy, mg-90nd Gold, mg-20sm intermediate alloy, stirring makes it be completely melt;(4) it is warming up to 730 DEG C to add in the middle of al-sr intermediate alloy and al-p Alloy, stands 15 minutes;(5) it is cooled to 710 DEG C of addition al-ti-b intermediate alloys, stirring, stand 3~5 minutes;(6) 700 DEG C when the pure magnesium press-in aluminum alloy melt that aluminium foil wrapped up with bell jar in, stirring makes it fully melt;(7) enter when being warming up to 710 DEG C Row refine, refining agent selects hexachlorethane, and the addition of refining agent is the 5% of aluminium alloy gross weight, with bell jar by aluminium foil during refine Horizontal turning movement in the refining agent press-in aluminium liquid of parcel, the content of hydrogen is surveyed in about 10min refine after finishing, and carries out stokehold inspection Look into;
Second step, stands 40min under 680 DEG C of pouring temperature, skims surface scum, obtains aluminium alloy melt, cast Prepare;Aluminium alloy melt temperature is kept to be 680 DEG C, mold temperature is 300 DEG C, injection speed 2.0m/s.
The high-plasticity aluminum alloy room temperature tensile intensity of die casting in the present embodiment is 287mpa, elongation percentage 20.5%.
Embodiment 5
The present embodiment is related to a kind of high plasticity alloy cast aluminum and its compression casting preparation method.
In a first aspect, the present embodiment provides a kind of high plasticity alloy cast aluminum, described al alloy component (weight content) is: 10.5%si, 0.8%mg, 0.5%mn, 0.4%ti, 0.1%gd, 0.1%y, 0.05%nd, 0.2%sm, 0.1%er, 1.0%fe, 90ppm p, 500ppm sr, other inevitable impurity are less than 0.2%, and remaining is al.
Second aspect, the present embodiment provides a kind of compression casting preparation method of described high plasticity alloy cast aluminum, including Following steps:
The first step, molten alloy, obtain aluminium alloy melt;Wherein, the technique of described molten alloy concretely comprises the following steps: (1) Melting raw material is preheated to 200 DEG C in an oven, is incubated more than 2 hours, the rust cleaning of the surface clean such as Slag Tool, bell jar is coated Coating, this coating adds appropriate water mediation to form using 25% Pulvis Talci and 5% waterglass, then is placed in the baking of stove surface, dries Roasting temperature is 200 DEG C, and baking was cleared up, to prevent increasing ferrum in fusion process for the alloy after 1 hour;(2) preheated crucible is to 420 DEG C, add silicon metal in crucible bottom, cover 2/3 of required fine aluminium amount after drying on silicon metal, heat up together, fine aluminium exists 680 DEG C about melt, silicon slowly melts under the parcel of aluminium liquid, is repeatedly stirred with graphite rod after fusing, adds remaining fine aluminium; (3) it is cooled to 720 DEG C and add conjunction in the middle of al-mn intermediate alloy, mg-90gd intermediate alloy, al-5y intermediate alloy, mg-90nd Gold, mg-20sm intermediate alloy, al-20er intermediate alloy, stirring makes it be completely melt;(4) it is warming up to 730 DEG C to add in al-sr Between alloy and al-p intermediate alloy, stand 15 minutes;(5) it is cooled to 710 DEG C of addition al-ti-b intermediate alloys, stirring, stand 3 ~5 minutes;(6), in the pure magnesium press-in aluminum alloy melt being wrapped up aluminium foil with bell jar when 700 DEG C, stirring makes it fully melt;(7) It is warming up to when 710 DEG C and carries out refine with aluminum refining agent, the addition of refining agent is the 2% of aluminium alloy gross weight, use during refine The refining agent that aluminium foil wraps up is pressed into horizontal turning movement in aluminium liquid by bell jar, and the content of hydrogen is surveyed in about 10min refine after finishing, go forward side by side Row stokehold checks;
Second step, stands 20min under 690 DEG C of pouring temperature, skims surface scum, obtains aluminium alloy melt, cast Prepare;Aluminium alloy melt temperature is kept to be 690 DEG C, mold temperature is 200 DEG C, injection speed 3.0m/s.
The high-plasticity aluminum alloy room temperature tensile intensity of die casting in the present embodiment is 281mpa, elongation percentage 20.3%.
Embodiment 6
The present embodiment is related to a kind of high plasticity alloy cast aluminum and its compression casting preparation method.
In a first aspect, the present invention provides a kind of high plasticity alloy cast aluminum, described al alloy component (weight content) is: 11.5%si, 0.6%mg, 0.3%mn, 0.2%ti, 0.05%gd, 0.1%y, 0.05%nd, 0.02%sm, 0.7%er, 0.02%la, 1.3%fe, 100ppm p, 600ppm sr, other inevitable impurity are less than 0.2%, and remaining is al.
Second aspect, the present embodiment provides a kind of compression casting preparation method of described high plasticity alloy cast aluminum, including Following steps:
The first step, molten alloy, obtain aluminium alloy melt;Wherein, the technique of described molten alloy concretely comprises the following steps: (1) Melting raw material is preheated to 200 DEG C in an oven, is incubated more than 2 hours, the rust cleaning of the surface clean such as Slag Tool, bell jar is coated Coating, this coating adds appropriate water mediation to form using 25% Pulvis Talci and 5% waterglass, then is placed in the baking of stove surface, dries Roasting temperature is 240 DEG C, and baking was cleared up, to prevent increasing ferrum in fusion process for the alloy after 1 hour;(2) preheated crucible is to 430 DEG C, add silicon metal in crucible bottom, cover 2/3 of required fine aluminium amount after drying on silicon metal, heat up together, fine aluminium exists 680 DEG C about melt, silicon slowly melts under the parcel of aluminium liquid, is repeatedly stirred with graphite rod after fusing, adds remaining fine aluminium; (3) it is cooled to 730 DEG C and add conjunction in the middle of al-mn intermediate alloy, mg-90gd intermediate alloy, al-5y intermediate alloy, mg-90nd Gold, mg-20sm intermediate alloy, al-20er intermediate alloy, al-20la intermediate alloy, stirring makes it be completely melt;(4) it is warming up to 740 DEG C add al-sr intermediate alloy and al-p intermediate alloy, stand 15 minutes;(5) it is cooled to 720 DEG C to add in the middle of al-ti-b Alloy, stirring, stand 3~5 minutes;(6) in the pure magnesium press-in aluminum alloy melt with bell jar, aluminium foil being wrapped up when 710 DEG C, stirring It is made fully to melt;(7) it is warming up to when 720 DEG C and carries out refine, refining agent selects hexachlorethane, and the addition of refining agent is alloy The refining agent that aluminium foil wraps up is pressed into horizontal turning movement in aluminium liquid, about 10min refine with bell jar during refine by the 2% of liquid gross weight Survey the content of hydrogen after finishing, and carry out stokehold inspection;
Second step, stands 30min under 670 DEG C of pouring temperature, skims surface scum, obtains aluminium alloy melt, cast Prepare;Aluminium alloy melt temperature is kept to be 670 DEG C, mold temperature is 200 DEG C, injection speed 1.0m/s.
The high-plasticity aluminum alloy room temperature tensile intensity of die casting in the present embodiment is 284mpa, elongation percentage 20.4%.
Embodiment 7
The present embodiment is related to a kind of high plasticity alloy cast aluminum and its compression casting preparation method.
In a first aspect, the present invention provides a kind of high plasticity alloy cast aluminum, described al alloy component (weight content) is: 13.5%si, 0.6%mg, 0.3%mn, 0.2%ti, 0.05%gd, 0.05%y, 0.02%nd, 0.02%sm, 0.1%er, 0.6%la, 0.1%yb, 1.2%fe, 10ppm p, 200ppm sr, other inevitable impurity are less than 0.2%, and remaining is al.
Second aspect, the present embodiment provides a kind of compression casting preparation method of described high plasticity alloy cast aluminum, including Following steps:
The first step, molten alloy, obtain aluminium alloy melt;Wherein, the technique of described molten alloy concretely comprises the following steps: (1) Melting raw material is preheated to 200 DEG C in an oven, is incubated more than 2 hours, the rust cleaning of the surface clean such as Slag Tool, bell jar is coated Coating, this coating adds appropriate water mediation to form using 25% Pulvis Talci and 5% waterglass, then is placed in the baking of stove surface, dries Roasting temperature is 200 DEG C, and baking was cleared up, to prevent increasing ferrum in fusion process for the alloy after 1 hour;(2) preheated crucible is to 440 DEG C, add silicon metal in crucible bottom, cover 2/3 of required fine aluminium amount after drying on silicon metal, heat up together, fine aluminium exists 680 DEG C about melt, silicon slowly melts under the parcel of aluminium liquid, is repeatedly stirred with graphite rod after fusing, adds remaining fine aluminium; (3) it is cooled to 730 DEG C and add conjunction in the middle of al-mn intermediate alloy, mg-90gd intermediate alloy, al-5y intermediate alloy, mg-90nd Gold, mg-20sm intermediate alloy, al-20er intermediate alloy, al-20la intermediate alloy, al-10yb intermediate alloy, stirring makes it complete Running down;(4) it is warming up to 740 DEG C and adds al-sr intermediate alloy and al-p intermediate alloy, stand 15 minutes;(5) it is cooled to 720 DEG C add al-ti-b intermediate alloy, stirring, stand 3~5 minutes;(6) the pure magnesium pressure with bell jar, aluminium foil wrapped up when 710 DEG C Enter in aluminum alloy melt, stirring makes it fully melt;(7) it is warming up to and carry out refine with aluminum refining agent when 720 DEG C, refining agent Addition is the 3% of aluminium alloy gross weight, with bell jar, the refining agent that aluminium foil wraps up is pressed into horizontal turning movement in aluminium liquid during refine, The content of hydrogen is surveyed in about 10min refine after finishing, and carries out stokehold inspection;
Second step, stands 30min under 690 DEG C of pouring temperature, skims surface scum, obtains aluminium alloy melt, cast Prepare;Aluminium alloy melt temperature is kept to be 690 DEG C, mold temperature is 200 DEG C, injection speed 1.5m/s.
The high-plasticity aluminum alloy room temperature tensile intensity of die casting in the present embodiment is 287mpa, elongation percentage 20.1%.
Embodiment 8
The present embodiment is related to a kind of high plasticity alloy cast aluminum and its compression casting preparation method.
In a first aspect, the present invention provides a kind of high plasticity alloy cast aluminum, described al alloy component (weight content) is: 14.5%si, 0.6%mg, 0.3%mn, 0.2%ti, 0.05%gd, 0.05%y, 0.02%nd, 0.02%sm, 0.1%er, 0.02%la, 0.7%yb, 1.1%fe, 10ppm p, 200ppm sr, other inevitable impurity are less than 0.2%, and remaining is al.
Second aspect, the present embodiment provides a kind of compression casting preparation method of described high plasticity alloy cast aluminum, including Following steps:
The first step, molten alloy, obtain aluminium alloy melt;Wherein, the technique of described molten alloy concretely comprises the following steps: (1) Melting raw material is preheated to 200 DEG C in an oven, is incubated more than 2 hours, the rust cleaning of the surface clean such as Slag Tool, bell jar is coated Coating, this coating adds appropriate water mediation to form using 25% Pulvis Talci and 5% waterglass, then is placed in the baking of stove surface, dries Roasting temperature is 200 DEG C, and baking was cleared up, to prevent increasing ferrum in fusion process for the alloy after 1 hour;(2) preheated crucible is to 400 DEG C, add silicon metal in crucible bottom, cover 2/3 of required fine aluminium amount after drying on silicon metal, heat up together, fine aluminium exists 680 DEG C about melt, silicon slowly melts under the parcel of aluminium liquid, is repeatedly stirred with graphite rod after fusing, adds remaining fine aluminium; (3) it is cooled to 730 DEG C and add conjunction in the middle of al-mn intermediate alloy, mg-90gd intermediate alloy, al-5y intermediate alloy, mg-90nd Gold, mg-20sm intermediate alloy, al-20er intermediate alloy, al-20la intermediate alloy, al-10yb intermediate alloy, stirring makes it complete Running down;(4) it is warming up to 740 DEG C and adds al-sr intermediate alloy and al-p intermediate alloy, stand 15 minutes;(5) it is cooled to 720 DEG C add al-ti-b intermediate alloy, stirring, stand 3~5 minutes;(6) the pure magnesium pressure with bell jar, aluminium foil wrapped up when 710 DEG C Enter in aluminum alloy melt, stirring makes it fully melt;(7) it is warming up to when 720 DEG C and carries out refine, refining agent selects hexachlorethane, essence The addition of refining agent is the 3% of aluminium alloy gross weight, with bell jar, the refining agent that aluminium foil wraps up is pressed into level in aluminium liquid circuitous during refine Backhaul dynamic, the content of hydrogen is surveyed in about 10min refine after finishing, and carries out stokehold inspection;
Second step, stands 30min under 690 DEG C of pouring temperature, skims surface scum, obtains aluminium alloy melt, cast Prepare;Aluminium alloy melt temperature is kept to be 690 DEG C, mold temperature is 200 DEG C, injection speed 2.5m/s.
In the present embodiment, the high-plasticity aluminum alloy room temperature tensile intensity of casting is 284mpa, elongation percentage 20.6%.
In sum, the present invention passes through the optimization of alloy compositions and preparation method, obtains a kind of alloy strength and plasticity is simultaneous Standby aluminium alloy, compared with prior art, has significantly progressive and substantive distinguishing features, specifically visible table 1 below.
Table 1 is cast aluminium alloy gold of the present invention and room-temperature property pair under the conditions of compression casting for the existing cast Al-Si alloy Than
Alloy designations (condition of heat treatment) Tensile strength (mpa) Elongation percentage (%)
Cn103146962a patent (f) ≥225 ≥6
Cn103898376a patent (f) ≥280 5~12
zl107a(t5) 420~470 4~6
yl112(f) ≥330 ≥3
a380(t5) ≥310 ≥3.2
Patent (t5) of the present invention ≥280 ≥20
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned Particular implementation, those skilled in the art can make various modifications or modification within the scope of the claims, this not shadow Ring the flesh and blood of the present invention.

Claims (5)

1. a kind of high plasticity alloy cast aluminum compression casting preparation method it is characterised in that described preparation method include following Step:
The first step, molten alloy, obtain aluminium alloy melt;
Second step, carries out compression casting to described aluminium alloy melt, obtains final product high plasticity alloy cast aluminum;Wherein, described high-ductility Cast aluminium alloy gold includes component and weight content is as follows: si 7.5~14.5%, mg 0.5~0.8%, mn 0.2~0.5%, Ti 0.1~0.4%, re 0.01~1.5%, fe 0.6~1.3%, p≤100ppm, sr 100~600ppm, balance of al;
In the first step, described molten alloy comprises the steps:
(1) by commercial-purity aluminium, silicon metal, pure magnesium, al-mn intermediate alloy, rare earth intermediate alloy, al-sr intermediate alloy, Al-p intermediate alloy and al-ti-b intermediate alloy are preheated to 100~200 DEG C, are incubated more than 2 hours;
(2) melting al, si: preheating melting utensil, to 400~500 DEG C, adds silicon metal in its bottom, covers on silicon metal The 40~80% of required commercial-purity aluminium gross weight, are warming up to the temperature of commercial-purity aluminium fusing, obtain aluminium liquid;Silicon metal is in the bag of aluminium liquid Wrap up in lower fusing, repeatedly stir after fusing, add remaining commercial-purity aluminium;
(3) mn, re are added: under the conditions of 720~740 DEG C, add in al-mn intermediate alloy, rare earth in step (2) gained liquation Between alloy;
(4) sr, p are added: under the conditions of 730~750 DEG C, add in al-sr intermediate alloy and al-p in step (3) gained liquation Between alloy, standing after 15~30 minutes stirring 3~5 minutes so as to abundant melt;
(5) add ti: under the conditions of 710~730 DEG C, in step (4) gained liquation, add al-ti-b intermediate alloy, stir, quiet Put 3~5 minutes;
(6) add mg: under the conditions of 700~720 DEG C, add pure magnesium in step (5) gained liquation, fully melt;
(7) refine: under the conditions of 710~740 DEG C, the addition refining agent in step (6) gained liquation, refine 10~20 minutes, Standing 15~40 minutes, is cooled to 660~700 DEG C, skims surface scum, obtain final product aluminium alloy melt.
2. the compression casting preparation method of high plasticity alloy cast aluminum according to claim 1 is it is characterised in that step (1), in, described preheating specially adopts baking oven.
3. the compression casting preparation method of high plasticity alloy cast aluminum according to claim 1 is it is characterised in that step (2), in, described smelting device is specially crucible;Described stirring adopts graphite rod.
4. the compression casting preparation method of high plasticity alloy cast aluminum according to claim 1 is it is characterised in that step (7), in, described refining agent is that conventional commercial contains sodium salt, potassium salt, the aluminum refining agent of villiaumite inorganic salt or hexachlorethane.
5. the compression casting preparation method of high plasticity alloy cast aluminum according to claim 1 is it is characterised in that second step In, in described compression casting, the pouring temperature of aluminium alloy melt is 660~700 DEG C, and injection speed is 0.2~3.0m/s, casting Mold preheating temperature is 200~300 DEG C.
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