CN107447137A - The high tough corrosion-resistant Al Si Cu cast aluminium alloy golds and preparation method of a kind of Zr and Sr combined microalloyings - Google Patents

The high tough corrosion-resistant Al Si Cu cast aluminium alloy golds and preparation method of a kind of Zr and Sr combined microalloyings Download PDF

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CN107447137A
CN107447137A CN201710639442.4A CN201710639442A CN107447137A CN 107447137 A CN107447137 A CN 107447137A CN 201710639442 A CN201710639442 A CN 201710639442A CN 107447137 A CN107447137 A CN 107447137A
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aluminium alloy
mass percent
resistant
cast aluminium
corrosion
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许晓静
贾伟杰
张福豹
杜东辉
张冲
黄鹏
王天伦
张进松
陈汉辉
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Jiangsu University
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Jiangsu University
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • 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
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04Modified aluminium-silicon alloys

Abstract

High tough corrosion-resistant Al Si Cu systems cast aluminium alloy gold of a kind of Zr and Sr combined microalloyings and preparation method thereof, it is characterized in that described aluminium alloy is mainly by aluminium(Al), silicon(Si), copper(Cu), zirconium(Zr), strontium(Sr)And iron(Fe)Composition, silicon(Si)Mass percent be 7.9~8.18 %, copper(Cu)Mass percent be 1.95~2.11%, zirconium(Zr)Mass percent be 0.169~0.187%, strontium(Sr)Mass percent be 0.0253~0.035%, iron(Fe)Mass percent be 0.133~0.153%, surplus is aluminium and a small amount of impurity element.Aluminium alloy as-cast structure of the present invention is fine and close, and cast alloy actual measurement room temperature impact toughness is 24.151438 ~ 39.312583 J/cm2Its tensile strength is 217.228 ~ 234.7 MPa simultaneously, elongation percentage is 9 ~ 9.529%, the uniform corrosion rate of 37 DEG C of temperature is 0.239345219 ~ 0.27074376 mm/y in the 3.5% NaCl aqueous solution, can meet the manufacture demand of the high tough corrosion-resisting aluminum casting alloy structural member of large-scale complex thin-wall.

Description

A kind of high tough corrosion-resistant Al-Si-Cu Cast aluminium alloys of Zr and Sr combined microalloyings Gold and preparation method
Technical field
The present invention relates to a kind of aluminum alloy materials and preparation method thereof, especially a kind of high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy gold and preparation method thereof, the high tough corrosion-resistant Al-Si-Cu of specifically a kind of Zr and Sr combined microalloyings Cast aluminium alloy gold and preparation method thereof.
Background technology
Al-Si(-Cu)It is that cast aluminium alloy gold is currently to apply most cast aluminium alloy materials in the industry, this eka-aluminum closes Gold the trade mark just like:Domestic YL102(AlSi12)、YL112(AlSi8.5Cu3.5)、YL113(AlSi811Cu3), it is Japanese ADC12(AlSi11Cu3)、ADC10(AlSi8.5Cu3.5)And the A380 in the U.S.(AlSi8.5Cu3.5)Deng these alloys tool There are excellent casting character, higher intensity and good corrosion resistance, but its plasticity, toughness are relatively low.
Al-Si(-Cu)It is the mechanical property and its second phase in organizing of cast aluminium alloy gold(Si phases)Form, size, Distribution is closely related.Refinement Si phases are by reducing Si isolating so as to improve Al-Si with respect to matrix Al(-Cu)It is Cast aluminium alloy The effective way of golden performance.Strontium(Sr)Element is a kind of effectively long-acting alterant in aluminium alloy, not only can be effectively thin Change Al-Si(-Cu)Be the Si phases in cast aluminium alloy gold, and can be effectively in refining alloy FeSiAl5Etc. compound phase.Zirconium (Zr)Element is a kind of and the strong 3d transition elements of Al affinity, is added in aluminium alloy, the zirconium in alloy graining process (Zr)Element forms A1 with Al3Zr(1580 DEG C of fusing point)Deng high-melting-point thing phase, Heterogeneous Nucleation is played in the follow-up solidification to alloy Effect, not only refining alloy as cast condition matrix, the tiny equiax crystal of promotion form, and improve the mobility and member of liquid alloy Plain distributing homogeneity.Therefore, Zr and Sr combined microalloying can not reduce alloy casting character, intensity, corrosion resistance While, greatly improve the plasticity and toughness of alloy.
Up to the present, there has been no a kind of the high tough of Zr and Sr combined microalloyings with independent intellectual property right in China Corrosion-resistant Al-Si(-Cu)It is that cast aluminium alloy gold and preparation method thereof is available, this constrains China's high-performance to a certain extent The development of cast aluminium alloy gold and its product industry.
The content of the invention
The purpose of the present invention is to be directed to current Al-Si(-Cu)It is cast aluminium alloy gold plasticity, the problem of toughness is relatively low, invention One kind by adjusting Si, Cu constituent content, while is added micro on the basis of Al-Si-Cu systems cast aluminium alloy gold composition design Strontium(Sr)And zirconium(Zr)Element carries out combined microalloying, is not reducing alloy casting character(Mobility)While, high-efficiency fine Si phases and compound phase in alloy, plasticity, the toughness of alloy are greatly improved, obtain one kind and have excellent casting character and height concurrently The Al-Si-Cu systems cast aluminium alloy gold of obdurability corrosion resistance, while its preparation method is provided.
One of technical scheme is:
A kind of high tough corrosion-resistant Al-Si-Cu cast aluminium alloy golds of Zr and Sr combined microalloyings, it is characterised in that:It is main By aluminium(Al), silicon(Si), copper(Cu), zirconium(Zr)And strontium(Sr)Composition, wherein, silicon(Si)Mass percent be 7.9~8.18 %, copper(Cu)Mass percent be 1.95~2.11%, zirconium(Zr)Mass percent be 0.169~0.187%, strontium(Sr)'s Mass percent is 0.0253~0.035%, and surplus is aluminium and a small amount of impurity element(If mass percent is 0.133~0.153% Iron, iron can by fine aluminium and intermediate alloy trace element be formed), the mass percent sum of each component is 100%.
The two of technical scheme are:
A kind of preparation method of the high tough corrosion-resistant Al-Si-Cu cast aluminium alloy golds of Zr and Sr combined microalloyings, it is characterized in that Its preparation process includes successively:
(1)First, will Al-Si intermediate alloys fusing after be warming up to 850 ± 10 DEG C, then sequentially add Al-Cu intermediate alloys, Al-Zr intermediate alloys, Al-Sr intermediate alloys and pure Al;
(2)Secondly, after all intermediate alloys and metal molten, 750 ± 10 DEG C are adjusted the temperature to, carbon trichloride refining is added and removes Gas escapes up to without gas, removes slag after 5~10 min of standing insulation and pours into be preheated in 300 ± 10 DEG C of metal die and pours Cast ingot, you can obtain the high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings.
Si mass percent is the quality hundred of Cu in 10.21%, Al-Cu intermediate alloys in described Al-Si intermediate alloys It is 4.11% to divide the mass percent that ratio is Zr in 50.12%, Al-Zr intermediate alloys, Sr quality hundred in Al-Sr intermediate alloys Divide than being 9.89%.
Beneficial effects of the present invention:
(1)It is 24.151438 ~ 39.312583 J/cm present invention obtains a kind of room temperature non-notch impact flexibility2(By GB/T 229-2007 metal material Charpy pendulum impact test methods), intensity is 217.228 ~ 234.7 MPa, elongation percentage be 9 ~ 9.529 %, hardness is 70.05 ~ 72.9 HV, electrical conductivity is 39.2998 ~ 40.0063% IACS;It is water-soluble in 3.5% NaCl The uniform corrosion rate of 93 hours is soaked in liquid at a temperature of 37 DEG C(Soaked entirely by GB 1024-88 metal materials laboratory homogeneous corrosion Test method)For 0.239345219 ~ 0.27074376 mm/y high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold.
(2)The present invention is contained on the basis of Al-Si-Cu systems cast aluminium alloy gold composition design by adjusting Si, Cu element Amount, while add zirconium(Zr)And strontium(Sr)Element carries out combined microalloying, ensures alloy group not reducing alloy casting character While knitting compactness, Si phases and compound phase in alloy have efficiently been refined, the toughness, intensity, modeling of alloy greatly improved Property and it is corrosion-resistant, such as Zr, Sr combined microalloying of the present invention high tough Al-Si-Cu cast aluminium alloy golds(It is with embodiment one Example), its impact flexibility, intensity, elongation percentage are than the Al-Si-Cu cast aluminium alloy golds without Zr, Sr combined microalloying(With contrast Exemplified by example one)Impact flexibility, intensity, elongation percentage be respectively increased 276 %, 15.8%, 54.5%, and average homogeneous corrosion rate It has dropped 19.3%.
(3)Si phase sizes are in granular form or stub in submicron order, shape in Al-Si-Cu systems of the present invention cast aluminium alloy gold Shape, and draw ratio is less than or equal to 2.
(4)The invention discloses a kind of composition and preparation method of high tough corrosion-resistant Al-Si-Cu cast aluminium alloy golds, one Determine to have broken the external technology blockage to high performance casting aluminium alloy in degree, can meet that Chinese large-sized complex thin-wall is high tough resistance to Corrode the demand of cast aluminium alloy gold product manufacturing.
(5)The present invention obtains preferable preparation method by largely testing, and is added in order especially by using The method of each intermediate alloy and simple metal controls each component content, can be readily derived by the technique of the present invention satisfactory Aluminum alloy materials.
Brief description of the drawings
Fig. 1 is the high tough corrosion-resistant Al-Si-Cu systems casting aluminium of the Zr and Sr combined microalloyings of the embodiment of the present invention one The metallographic structure optical microscope photograph of alloy.
Fig. 2 is the high tough corrosion-resistant Al-Si-Cu systems casting aluminium of the Zr and Sr combined microalloyings of the embodiment of the present invention one The metallographic structure electron scanning micrograph of alloy.
Fig. 3 is the high tough corrosion-resistant Al-Si-Cu systems casting aluminium of the Zr and Sr combined microalloyings of the embodiment of the present invention one The room temperature non-notch impact flexibility performance test fracture surface of sample electron scanning micrograph of alloy.
Fig. 4 is the high tough corrosion-resistant Al-Si-Cu systems casting aluminium of the Zr and Sr combined microalloyings of the embodiment of the present invention one The room temperature tensile properties test sample Fracture scan electron micrograph of alloy.
Fig. 5 is the high tough corrosion-resistant Al-Si-Cu systems casting aluminium of the Zr and Sr combined microalloyings of the embodiment of the present invention one The corrosion resistance test sample metallographic surface Scanning Electron microphotograph of alloy.
Fig. 6 is the gold of the Al-Si-Cu systems cast aluminium alloy gold without Zr and Sr combined microalloyings of comparative example one of the present invention Phase constitution optical microscope photograph.
Fig. 7 is the gold of the Al-Si-Cu systems cast aluminium alloy gold without Zr and Sr combined microalloyings of comparative example one of the present invention Phase constitution electron scanning micrograph.
Fig. 8 is the room of the Al-Si-Cu systems cast aluminium alloy gold without Zr and Sr combined microalloyings of comparative example one of the present invention Warm non-notch impact flexibility performance test fracture surface of sample electron scanning micrograph.
Fig. 9 is the room of the Al-Si-Cu systems cast aluminium alloy gold without Zr and Sr combined microalloyings of comparative example one of the present invention Warm tensile property test sample Fracture scan electron micrograph.
Figure 10 is the Al-Si-Cu systems cast aluminium alloy gold without Zr and Sr combined microalloyings of comparative example one of the present invention Corrosion resistance test sample metallographic surface Scanning Electron microphotograph.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
Embodiment one
As shown in Fig. 1,2,3,4,5.
A kind of high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings, its preparation method:
Exemplified by being prepared by 1Kg
First by 0.833Kg Al-Si, (89.62 %Al, 10.21%Si, 0.17% Fe, all components of the present invention use quality Percentage represents that similarly hereinafter, the part that all components are added less than 100% is impurity) intermediate alloy(Si loss late is about 5%)It is molten 850 DEG C are warming up to after change, then sequentially adds 0.0431Kg Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11% Si) intermediate alloy(Cu loss late is about 6.25%)、0.0489Kg Al-Zr (95.69%Al, 4.11%Zr,0.20%Fe, 0.10%Si) intermediate alloy(Zr loss late is about 8%)、0.0141Kg Al-Sr(89.86%Al, 9.89%Sr,0.15%Fe, 0.10%Si) intermediate alloy(Sr loss late is about 75%)With the pure Al of 0.0609Kg A00 grades(99.79%Al, 0.14%Fe, 0.04%Si);After all intermediate alloys and metal molten, adjust the temperature to 750 DEG C, add carbon trichloride refining degasification until There is no gas effusion, removing slag and pour into after 5~10 min of standing insulation is preheated in 300 DEG C of metal die ingot of casting;I.e. Obtain a kind of high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings.
The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of the Zr and Sr combined microalloyings of the present embodiment is through spectrum Actually measuring its composition is:8.08 %Si, 2.1 %Cu, 0.185 %Zr, 0.0348 %Sr, 0.136 %Fe, surplus are Aluminium and impurity element.
The high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy payment organization of the Zr and Sr combined microalloyings of the present embodiment causes It is close(Fig. 1), Si phases are tiny, and size is in granular form or corynebacterium in submicron order, shape, and draw ratio is less than or equal to 2(Fig. 1, Fig. 2);Room temperature non-notch impact flexibility is 39.312583 J/cm2(Impacted by GB/T 229-2007 metal materials Charpy pendulu Test method), impact toughness sample fracture is in the typical ductile rupture of dimple feature(Fig. 3);Intensity is 234.7 MPa, extension Rate is 9%, and tensile sample fracture is in the typical ductile rupture of dimple feature(Fig. 4);Its hardness is 72.9 HV, electrical conductivity is 39.2998% IACS, the uniform corrosion rate that 93 hours are soaked in the 3.5% NaCl aqueous solution at a temperature of 37 DEG C(By GB 1024-88 Uniform Corrosion Method of Laboratory Immersion Test methods)For 0.239345219 mm/y, corrosion surface Si phase sizes It is tiny(Fig. 5).
Embodiment two
A kind of high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings, its preparation method:
Exemplified by being prepared by 1kg.
It is warming up to after first 0.819Kg Al-Si (89.62 %Al, 10.21%Si, 0.17% Fe) intermediate alloy is melted 850 ± 10 DEG C, then sequentially add in 0.0424Kg Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si) Between alloy(Cu loss late is about 6.25%)、0.0476Kg Al-Zr (95.69%Al, 4.11%Zr,0.20%Fe, 0.10% Si) intermediate alloy(Zr loss late is about 8%)、0.0133Kg Al-Sr(89.86%Al, 9.89%Sr,0.15%Fe, 0.10%Si) intermediate alloy(Sr loss late is about 75%)With the pure Al of 0.0777Kg A00 grades(99.79%Al, 0.14%Fe, 0.04%Si);After all intermediate alloys and metal molten, 750 ± 10 DEG C are adjusted the temperature to, adds carbon trichloride refining degasification Until being escaped without gas, remove slag after 5~10 min of standing insulation and pour into be preheated in 300 ± 10 DEG C of metal die and cast Ingot;Obtain a kind of high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings.
The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of the Zr and Sr combined microalloyings of the present embodiment is through spectrum Actually measuring its composition is:7.94 %Si, 1.97 %Cu, 0.18%Zr, 0.033%Sr, 0.147 %Fe, surplus is aluminium And impurity element.
The high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy payment organization of the Zr and Sr combined microalloyings of the present embodiment causes Close, Si phases are tiny, and size is in granular form or corynebacterium in submicron order, shape, and draw ratio is less than or equal to 2;Room temperature is intact Mouth impact flexibility is 24.151438J/cm2(By GB/T 229-2007 metal material Charpy pendulum impact test methods), impact Toughness specimen fracture is in the typical ductile rupture of dimple feature;Intensity is 217.2MPa, elongation percentage 9.24%, and tensile sample breaks Mouth is in the typical ductile rupture of dimple feature;Its hardness is 72.35HV, electrical conductivity is 40.0063% IACS, in 3.5% NaCl The uniform corrosion rate of 93 hours is soaked in the aqueous solution at a temperature of 37 DEG C(By GB 1024-88 metal materials laboratory homogeneous corrosion Total immersion test method)It is tiny for 0.24567205 mm/y, corrosion surface Si phase sizes.
Embodiment three
A kind of high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings, its preparation method:
Exemplified by being prepared by 1Kg
First by 0.828Kg Al-Si (89.62 %Al, 10.21%Si, 0.17% Fe) intermediate alloy(Si loss late is about 5%)850 ± 10 DEG C are warming up to after fusing, then sequentially adds 0.0447Kg Al-Cu (49.62%Al, 50.12%Cu, 0.15% Fe, 0.11%Si) intermediate alloy(Cu loss late is about 6.25%)、0.045Kg Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si) intermediate alloy(Zr loss late is about 8%)、0.0105Kg Al-Sr(89.86%Al, 9.89% Sr, 0.15%Fe, 0.10%Si) intermediate alloy(Sr loss late is about 75%)With the pure Al of 0.0718Kg A00 grades(99.79% Al, 0.14%Fe, 0.04%Si);After all intermediate alloys and metal molten, 750 ± 10 DEG C are adjusted the temperature to, adds chlordene Until being escaped without gas, removing slag and pouring into after standing 5~10 min of insulation is preheated to 300 ± 10 DEG C of gold for ethane refining degasification Belong to ingot of being cast in mould;Obtain a kind of high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy of Zr and Sr combined microalloyings Gold.
The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of the Zr and Sr combined microalloyings of the present embodiment is through spectrum Actually measuring its composition is:8.03 %Si, 2.08 %Cu, 0.17 %Zr, 0.026 %Sr, 0.147 %Fe, surplus are Aluminium and impurity element.
The high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy payment organization of the Zr and Sr combined microalloyings of the present embodiment causes Close, Si phases are tiny, and size is in granular form or corynebacterium in submicron order, shape, and draw ratio is less than or equal to 2;Room temperature is intact Mouth impact flexibility is 24.630211 J/cm2(By GB/T 229-2007 metal material Charpy pendulum impact test methods), punching Hit the typical ductile rupture that toughness specimen fracture is in dimple feature;Intensity is 217.5MPa, elongation percentage 9.53%, tensile sample Fracture is in the typical ductile rupture of dimple feature;Its hardness is 70.05HV, electrical conductivity is 39.79% IACS, 3.5% The uniform corrosion rate of 93 hours is soaked in the NaCl aqueous solution at a temperature of 37 DEG C(It is uniform by GB 1024-88 metal materials laboratory Corrode total immersion test method)It is tiny for 0.27074376mm/y, corrosion surface Si phase sizes.
Example IV.
Exemplified by being prepared by 1000 grams, calculated to simplify, the present embodiment does not consider the loss late of element, specific implementation when calculating When can suitably take in plus loss amount.
850 ± 10 DEG C are warming up to after first 773.8g Al-Si intermediate alloys are melted, then sequentially adds 38.91gAl-Cu Intermediate alloy, 41.12 grams of Al-Zr intermediate alloys, 2.53g Al-Sr intermediate alloys and the pure Al of 143.64g A00 grades;Treat institute After having intermediate alloy and metal molten, 750 ± 10 DEG C are adjusted the temperature to, adds carbon trichloride refining degasification until being escaped without gas Go out, removing slag and pour into after 5~10 min of standing insulation is preheated in 300 ± 10 DEG C of metal die ingot of casting;Obtain one The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of kind Zr and Sr combined microalloyings.
The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of the Zr and Sr combined microalloyings of the present embodiment is through spectrum Actually measuring its composition is:7.9 %Si, 1.95 %Cu, 0.169 %Zr, 0.0253 %Sr, 0.133 %Fe, surplus are Aluminium and impurity element.
The high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy payment organization of the Zr and Sr combined microalloyings of the present embodiment causes Close, Si phases are tiny, and size is in granular form or corynebacterium in submicron order, shape, and draw ratio is less than or equal to 2;Room temperature is intact Mouth impact flexibility, impact toughness sample fracture are in the typical ductile rupture feature of dimple feature, intensity, elongation percentage, tensile sample Fracture in the typical ductile rupture feature of dimple feature, hardness, electrical conductivity, soaked in the 3.5% NaCl aqueous solution at a temperature of 37 DEG C The performance parameters such as the bubble uniform corrosion rate of 93 hours are close with embodiment one.
Embodiment five.
Exemplified by being prepared by 1000 grams, calculated to simplify, the present embodiment does not consider the loss late of element, specific implementation when calculating When can suitably take in plus loss amount.
850 ± 10 DEG C are warming up to after first 801.18g Al-Si intermediate alloys are melted, then sequentially adds 42.10gAl- Cu intermediate alloys, 45.50 grams of Al-Zr intermediate alloys, 3.54g Al-Sr intermediate alloys and the pure Al of 107.68g A00 grades;Treat After all intermediate alloys and metal molten, 750 ± 10 DEG C are adjusted the temperature to, adds carbon trichloride refining degasification until not having gas Escape, removing slag and pour into after 5~10 min of standing insulation is preheated in 300 ± 10 DEG C of metal die ingot of casting;Obtain A kind of high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings.
The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of the Zr and Sr combined microalloyings of the present embodiment is through spectrum Actually measuring its composition is:8.18 %Si, 2.11 %Cu, 0.187 %Zr, 0.035 %Sr, 0.153 %Fe, surplus are Aluminium and impurity element.
The high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy payment organization of the Zr and Sr combined microalloyings of the present embodiment causes Close, Si phases are tiny, and size is in granular form or corynebacterium in submicron order, shape, and draw ratio is less than or equal to 2;Room temperature is intact Mouth impact flexibility, impact toughness sample fracture are in the typical ductile rupture feature of dimple feature, intensity, elongation percentage, tensile sample Fracture in the typical ductile rupture feature of dimple feature, hardness, electrical conductivity, soaked in the 3.5% NaCl aqueous solution at a temperature of 37 DEG C The performance parameters such as the bubble uniform corrosion rate of 93 hours are close with embodiment one.
Comparative example one
As shown in Fig. 6,7,8,9,10.
A kind of Al-Si-Cu systems cast aluminium alloy gold without Zr and Sr combined microalloyings, its preparation method:
Exemplified by being prepared by 1Kg:
First by 0.876Kg Al-Si (89.62 %Al, 10.21%Si, 0.17% Fe) intermediate alloy(Si loss late is about 5%)850 ± 10 DEG C are warming up to after fusing, then sequentially adds 0.046Kg Al-Cu (49.62%Al, 50.12%Cu, 0.15% Fe, 0.11%Si) intermediate alloy(Cu loss late is about 6.25%)With the pure Al of 0.078Kg A00 grades(99.79%Al, 0.14%Fe, 0.04%Si);After all intermediate alloys and metal molten, 750 ± 10 DEG C are adjusted the temperature to, adds carbon trichloride Degasification is refined until being escaped without gas, removing slag and pouring into after standing 5~10 min of insulation is preheated to 300 ± 10 DEG C of metal pattern Cast in tool ingot;Obtain a kind of high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings. Obtain a kind of Al-Si-Cu systems cast aluminium alloy gold without Zr and Sr combined microalloyings.
The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold group without Zr and Sr combined microalloyings of this comparative example Knit densification(Fig. 6), Si phases are larger, and size is in micron order, and shape is in strip, and draw ratio is more than 2(Fig. 6, Fig. 7);Room temperature Non-notch impact flexibility average value is 10.45422933J/cm2(Impact and try by GB/T 229-2007 metal materials Charpy pendulu Proved recipe method), the fracture of impact toughness sample is in the typical brittle fracture of Quasi cleavage feature(Fig. 8);Intensity be 202.6805 MPa, Elongation percentage is 5.824 %, and the fracture of tensile sample is in the typical brittle fracture of Quasi cleavage feature(Fig. 9);Its hardness is 75.075HV, electrical conductivity are 33.3342% IACS;93 hours equal is soaked at a temperature of 37 DEG C in the 3.5% NaCl aqueous solution Even corrosion rate(By GB 1024-88 Uniform Corrosion Method of Laboratory Immersion Test methods)For 0.296661583 mm/y, Corrosion surface Si phase sizes are thick(Figure 10).
The Al-Si-Cu systems cast aluminium alloy gold without Zr and Sr combined microalloyings of this comparative example is through the actual measurement of spectrum Its composition is:8.5 %Si, 2.14 %Cu, 0.144%Fe, surplus are aluminium and impurity element.
Only list above the aluminium alloy of several common proportionings with when manufacture method, those skilled in the art can be with Suitably adjusted according to examples detailed above the proportioning of each component and strictly by above-mentioned steps carry out manufacture can obtain preferable Zr and The high tough corrosion-resistant Al-Si of Sr combined microalloyings(-Cu)It is cast aluminium alloy gold.
Part that the present invention does not relate to is same as the prior art or can be realized using prior art.

Claims (3)

1. high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of a kind of Zr and Sr combined microalloyings and preparation method thereof, its It is characterised by:It is mainly by aluminium(Al), silicon(Si), copper(Cu), zirconium(Zr)And strontium(Sr)Composition, wherein, silicon(Si)Quality hundred It is 7.9~8.18 % to divide ratio, copper(Cu)Mass percent be 1.95~2.11%, zirconium(Zr)Mass percent for 0.169~ 0.187%, strontium(Sr)Mass percent be 0.0253~0.035%, surplus is aluminium and a small amount of impurity element, the quality of each component Percentage sum is 100%.
A kind of 2. high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of the Zr and Sr combined microalloyings described in claim 1 Preparation method, it is characterized in that its preparation process includes successively:
(1)First, will Al-Si intermediate alloys fusing after be warming up to 850 ± 10 DEG C, then sequentially add Al-Cu intermediate alloys, Al-Zr intermediate alloys, Al-Sr intermediate alloys and pure Al;
(2)Secondly, after all intermediate alloys and metal molten, 750 ± 10 DEG C are adjusted the temperature to, carbon trichloride refining is added and removes Gas escapes up to without gas, removes slag after 5~10 min of standing insulation and pours into be preheated in 300 ± 10 DEG C of metal die and pours Cast ingot, you can obtain the high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings.
3. preparation method according to claim 2, it is characterized in that in described Al-Si intermediate alloys Si mass percent The mass percent that mass percent for Cu in 10.21%, Al-Cu intermediate alloys is Zr in 50.12%, Al-Zr intermediate alloys Mass percent for Sr in 4.11%, Al-Sr intermediate alloys is 9.89%.
CN201710639442.4A 2017-07-31 2017-07-31 The high tough corrosion-resistant Al Si Cu cast aluminium alloy golds and preparation method of a kind of Zr and Sr combined microalloyings Pending CN107447137A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110592440A (en) * 2019-08-27 2019-12-20 江苏大学 Short-process preparation method of high-performance and high-stability Al-Si-Cu series cast aluminum alloy component
CN110592439A (en) * 2019-08-27 2019-12-20 江苏大学 High-plasticity Al-Si-Cu series cast aluminum alloy and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101775529A (en) * 2010-01-11 2010-07-14 北京科技大学 High-strength cast aluminum-silicon alloy for engine body and preparation method thereof
CN106947892A (en) * 2017-05-12 2017-07-14 南通江中光电有限公司 A kind of high tough anticorrosion aluminium material and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101775529A (en) * 2010-01-11 2010-07-14 北京科技大学 High-strength cast aluminum-silicon alloy for engine body and preparation method thereof
CN106947892A (en) * 2017-05-12 2017-07-14 南通江中光电有限公司 A kind of high tough anticorrosion aluminium material and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110592440A (en) * 2019-08-27 2019-12-20 江苏大学 Short-process preparation method of high-performance and high-stability Al-Si-Cu series cast aluminum alloy component
CN110592439A (en) * 2019-08-27 2019-12-20 江苏大学 High-plasticity Al-Si-Cu series cast aluminum alloy and preparation method thereof

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Application publication date: 20171208