CN107385287A - Zirconium is strontium compound microalloyed and the high tough Al-Si-Cu-based cast aluminium alloy gold and preparation method of MnZn alloying - Google Patents
Zirconium is strontium compound microalloyed and the high tough Al-Si-Cu-based cast aluminium alloy gold and preparation method of MnZn alloying Download PDFInfo
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Abstract
A kind of high tough Al Si Cu cast aluminium alloy golds of Zr, Sr combined microalloying and Mn, Zn alloying and preparation method thereof, it is characterised in that：It is mainly by aluminium（Al）, the silicon of mass percent 8.14~8.24%（Si）, 2.22~82.29% bronze medals（Cu）, 0.484~80.489% manganese（Mn）, 1.04~81.05% zinc（Zn）, 0.179~80.183% zirconium（Zr）, 0.043~80.0444% strontium（Sr）With 0.137~80.14% iron（Fe）Composition.Aluminium alloy as-cast structure of the present invention is fine and close, and as cast condition actual measurement room temperature non-notch impact flexibility is 21.659404 J/cm2While its intensity is 247.3 MPa, elongation percentage 12.545455%, the uniform corrosion rate in the 3.5%NaCl aqueous solution at a temperature of 37 DEG C are 0.31993164 mm/y, the manufacture demand of the high tough corrosion-resisting aluminum casting alloy structural member of large-scale complex thin-wall can be met.
Description
Technical field
The present invention relates to a kind of aluminum alloy materials, the tough Al-Si-Cu systems cast aluminium alloy gold of especially a kind of novel high-strength and its
The high tough Al-Si-Cu systems casting aluminium of preparation method, specifically a kind of Zr, Sr combined microalloying and Mn, Zn alloying
Alloy 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, this kind of alloy in the industry
Numbering have：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, limit
It is applied.
It is well known that Al-Si（-Cu）It is the mechanical property and its second phase in organizing of cast aluminium alloy gold（Silicon is equal）'s
Form, size, distribution are closely related.Refinement Si phases are to reduce Si isolating so as to improve Al-Si with respect to matrix Al（-Cu）System's casting
Make the effective way of aluminium alloy capability.Strontium（Sr）Element is a kind of effectively long-acting alterant in aluminium alloy, not only can be with
Effectively refinement Al-Si（-Cu）Be the Si phases in cast aluminium alloy gold, and can be effectively in refining alloy FeSiAl5Deng chemical combination
Thing phase.Zirconium（Zr）Element, manganese（Mn）It is a kind of with the strong element of Al affinity, is added in aluminium alloy, in alloy graining process
Middle zirconium（Zr）Element, manganese（Mn）A1 is formed with Al3Zr、A16The high-melting-point thing phase such as Mn, the follow-up solidification to alloy are played heterogeneous
Forming core acts on, and not only refining alloy as cast condition matrix, promotes tiny equiax crystal to be formed, and improves the mobility of liquid alloy
With Elemental redistribution uniformity, the addition of Mn elements in addition can also reduce liquid aluminium to burn failure caused by casting mould sticking to mould.
Zinc（Zn）It is the element that a kind of fusing point is relatively low and can be completely dissolved in aluminium liquid, zinc（Zn）The addition of element can improve liquid
The mobility of alloy is casting character.Therefore, Zr, Sr combined microalloying and Mn, Zn alloying can not reduce alloy casting
While making the performances such as performance, intensity, the plasticity and toughness of alloy are greatly improved.
Up to the present, there has been no a kind of Zr, Sr combined microalloying and Mn, Zn conjunction with independent intellectual property right in China
The high tough Al-Si-Cu systems cast aluminium alloy gold of aurification and preparation method thereof is available, and this constrains China's height to a certain extent
The manufacturing development of performance cast aluminium alloy gold and products thereof.
The content of the invention
The purpose of the present invention is 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 adds trace zirconium on the basis of Al-Si-Cu systems cast aluminium alloy gold composition design
（Zr）, strontium（Sr）Element and a small amount of manganese（Mn）, zinc（Zn）Element carries out composite alloying, is not reducing alloy casting character（Stream
Dynamic property）While, Si phases and compound phase in efficient refining alloy, plasticity, the toughness of alloy are greatly improved, is obtained a kind of simultaneous
Have excellent casting character and the Al-Si-Cu systems cast aluminium alloy gold of obdurability, while its preparation method is provided.
One of technical scheme is：
The high tough Al-Si-Cu systems cast aluminium alloy gold of a kind of Zr, Sr combined microalloying and Mn, Zn alloying, its feature exist
In：It is mainly by aluminium（Al）, silicon（Si）, copper（Cu）, manganese（Mn）, zinc（Zn）, zirconium（Zr）And strontium（Sr）Composition, wherein, silicon（Si）
Mass percent be 8.14 ~ 8.24 %, copper（Cu）Mass percent be 2.22 ~ 2.29%, manganese（Mn）Mass percent be
0.484 ~ 0.489%, zinc（Zn）Mass percent be 1.04 ~ 1.05%, zirconium（Zr）Mass percent be 0.179 ~ 0.183%,
Strontium（Sr）Mass percent be 0.043 ~ 0.0444%, surplus is aluminium and a small amount of impurity element（As mass percent be 0.137 ~
0.14% iron）, the mass percent sum of each component is 100%.
The two of technical scheme are：
A kind of preparation method of the high tough Al-Si-Cu cast aluminium alloy golds of Zr, Sr combined microalloying and Mn, Zn alloying, its
It is characterized in that its preparation process includes successively：
（1）First, 850 ± 10 DEG C are warming up to after pure Al and Al-Si intermediate alloys are melted, is then sequentially added among Al-Cu
After alloy, Al-Mn intermediate alloys, Al-Zr intermediate alloys and Al-Sr intermediate alloys, intermediate alloy to be added and pure Al melt
Add pure Zn；
（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
Ingot is cast, that is, obtains the high tough Al-Si-Cu systems cast aluminium alloy gold of Zr, Sr combined microalloying and Mn, Zn alloying.
Si mass percent is the quality hundred of Cu in 10.21%, Al-Cu intermediate alloys in described Al-Si intermediate alloys
It is 10.02% to divide the mass percent that ratio is Mn in 50.12%, Al-Mn intermediate alloys, Zr quality hundred in Al-Zr intermediate alloys
It is 9.89% to divide the mass percent that ratio is Sr in 4.11%, Al-Sr intermediate alloys.
Beneficial effects of the present invention：
（1）It is 20.4 J/cm present invention obtains a kind of room temperature non-notch impact flexibility average value2（By GB/T 229-2007
Metal material Charpy pendulum impact test method）, mechanical properties are 247.3 MPa, elongation percentage 7.941%；Hardness is
75.75 HV, electrical conductivity are 31.38508% IACS；It is equal when soaking 93 h 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 0.31993164 mm/y's
High tough 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 trace zirconium（Zr）, strontium（Sr）Element and a small amount of manganese（Mn）, zinc（Zn）Element carries out alloying, is not reducing conjunction
While golden casting character ensures alloy structure densification, Si phases and the compound phase in alloy are efficiently refined, greatly improved
Toughness, intensity and the plasticity of alloy, such as Zr, Sr combined microalloying of the present invention and the high tough Al-Si-Cu of Mn, Zn alloying
Cast aluminium alloy gold（By taking embodiment one as an example）, its impact flexibility, intensity, elongation percentage ratio without Zr, Sr combined microalloying and Mn,
The Al-Si-Cu cast aluminium alloy golds of Zn alloyings（By taking comparative example one as an example）Impact flexibility, intensity, elongation percentage be respectively increased
107.2 %、22.0%、36.4%。
（3）The Si phase sizes of Al-Si-Cu systems of the present invention cast aluminium alloy gold are at 1-2 μm, and shape is in granular form or corynebacterium,
And draw ratio is less than or equal to 2.
（4）Impacted present invention obtains a kind of with stretching fracture in the high tough resistance to of the typical ductile rupture of dimple feature
Corrode Al-Si-Cu systems cast aluminium alloy gold.
（5）The invention discloses a kind of composition and preparation method of high tough Al-Si-Cu cast aluminium alloy golds, to a certain degree
On broken the external technology blockage to high performance casting aluminium alloy, can meet that Chinese large-sized complex thin-wall high-toughness casting aluminium closes
The manufacture demand of golden product.
（6）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 Zr, Sr combined microalloying and the high tough Al-Si-Cu systems of Mn, Zn alloying of the embodiment of the present invention one
The metallographic structure optical microscope photograph of cast aluminium alloy gold.
Fig. 2 is Zr, Sr combined microalloying and the high tough Al-Si-Cu systems of Mn, Zn alloying of the embodiment of the present invention one
The metallographic structure electron scanning micrograph of cast aluminium alloy gold.
Fig. 3 is Zr, Sr combined microalloying and the high tough Al-Si-Cu systems of Mn, Zn alloying 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 cast aluminium alloy gold.
Fig. 4 is Zr, Sr combined microalloying and the high tough Al-Si-Cu systems of Mn, Zn alloying of the embodiment of the present invention one
The room temperature tensile test sample Fracture scan electron micrograph of cast aluminium alloy gold.
Fig. 5 is Zr, Sr combined microalloying and the high tough Al-Si-Cu castings of Mn, Zn alloying of the embodiment of the present invention one
Make the corrosion sample surface Scanning Electron microphotograph of aluminium alloy.
Fig. 6 is both Al-Si-Cu systems castings without Zr, Sr combined microalloying or without Mn, Zn alloying of comparative example one
Make the metallographic structure optical microscope photograph of aluminium alloy.
Fig. 7 is both Al-Si-Cu systems castings without Zr, Sr combined microalloying or without Mn, Zn alloying of comparative example one
Make the metallographic structure electron scanning micrograph of aluminium alloy.
Fig. 8 is both Al-Si-Cu systems castings without Zr, Sr combined microalloying or without Mn, Zn alloying of comparative example one
Make the room temperature non-notch impact flexibility performance test fracture surface of sample electron scanning micrograph of aluminium alloy.
Fig. 9 is both Al-Si-Cu systems castings without Zr, Sr combined microalloying or without Mn, Zn alloying of comparative example one
Make the room temperature tensile test sample Fracture scan electron micrograph of aluminium alloy.
Figure 10 is both Al-Si-Cu systems without Zr, Sr combined microalloying or without Mn, Zn alloying of comparative example one
The corrosion sample surface Scanning Electron microphotograph of cast aluminium alloy gold.
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.
The high tough Al-Si-Cu systems cast aluminium alloy gold of a kind of Zr, Sr combined microalloying and Mn, Zn alloying, it is prepared
Method：
First by the pure Al of A00 grades（99.79%Al, 0.14%Fe, 0.04%Si）With Al-Si (89.62 %Al, 10.21%Si,
0.17% Fe, all components of the present invention represent that those skilled in the art can be obtained by regular program using mass percent
To corresponding parts by weight, similarly hereinafter, it is impurity that all components, which are added the part less than 100%) 850 are warming up to after intermediate alloy fusing
± 10 DEG C, then sequentially add Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si) intermediate alloy, Al-Mn
(89.73%Al, 10.02%Mn, 0.19%Fe, 0.06%Si) intermediate alloy, Al-Zr (95.69%Al, 4.11%Zr,
0.20%Fe, 0.10%Si) close among intermediate alloy and Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si)
Gold, intermediate alloy to be added and pure Al add the pure Zn of 1.04 % after melting；After all intermediate alloys and metal molten, regulation
Temperature adds carbon trichloride refining degasification until being escaped without gas to 750 ± 10 DEG C, is removed slag simultaneously after standing 5 ~ 10 min of insulation
Pour into and be preheated in 300 ± 10 DEG C of metal die ingot of casting；A kind of Zr, Sr combined microalloying and Mn, Zn is obtained to close
The high tough Al-Si-Cu systems cast aluminium alloy gold of aurification.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu systems cast aluminium alloy gold of Mn, Zn alloying
It is through compositions such as the actual measurements of spectrum：8.19 %Si, 2.26 %Cu, 0.486 Mn %, 0.0032 %Mg, 1.04 %Zn,
0.181 %Zr, 0.0435 %Sr, 0.138 %Fe, surplus are aluminium and impurity element.Mg therein is institute in intermediate alloy
What the trace impurity contained was formed（Similarly hereinafter）.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds group of Mn, Zn alloying
Knit densification（Fig. 1）, Si phases are tiny, and size is in granular form or corynebacterium in 1 ~ 2 μm, shape, and draw ratio is less than or equal to 2（Figure
1st, Fig. 2）；Room temperature non-notch impact flexibility average value is 21.659404 J/cm2（By GB/T 229-2007 metal material Charpy
Pendulum impact test method）, impact toughness sample fracture is in the typical ductile rupture of dimple feature（Fig. 3）；Intensity is 247.3
MPa, elongation percentage 7.941%, fracture are in the typical ductile rupture of dimple feature（Fig. 4）；Hardness is 75.75 HV, electrical conductivity is
31.38508%；Uniform corrosion rate when soaking 93 h at a temperature of 37 DEG C in the 3.5% NaCl aqueous solution（By GB 1024-88
Uniform Corrosion Method of Laboratory Immersion Test method）It is tiny for 0.31993164 mm/y, corrosion surface Si phase sizes（Figure
5）.
Embodiment two.
The high tough Al-Si-Cu systems cast aluminium alloy gold of a kind of Zr, Sr combined microalloying and Mn, Zn alloying, it is prepared
Method：
First by the pure Al of A00 grades（99.79%Al, 0.14%Fe, 0.04%Si）With Al-Si (89.62 %Al, 10.21%Si,
0.17% Fe, all components of the present invention represent that similarly hereinafter, the part that all components are added less than 100% is using mass percent
Impurity) intermediate alloy fusing after be warming up to 850 ± 10 DEG C, then sequentially add Al-Cu (49.62%Al, 50.12%Cu, 0.15%
Fe, 0.11%Si) intermediate alloy, Al-Mn (89.73%Al, 10.02%Mn, 0.19%Fe, 0.06%Si) intermediate alloy,
Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si) intermediate alloys and Al-Sr (89.86%Al, 9.89%Sr,
0.15%Fe, 0.10%Si) intermediate alloy, add the pure Zn of 1.04 % after intermediate alloy to be added and pure Al thawings；Wait own
After 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 a kind of
The high tough Al-Si-Cu systems cast aluminium alloy gold of Zr, Sr combined microalloying and Mn, Zn alloying.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds warp of Mn, Zn alloying
Spectrum it is actual measurement etc. composition be：8.17 %Si, 2.26 %Cu, 0.4865Mn %, 0.0048%Mg, 1.04 %Zn,
0.182%Zr, 0.04353%Sr, 0.138 %Fe, surplus are aluminium and impurity element.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds group of Mn, Zn alloying
Densification is knitted, Si phases are tiny, and size is in granular form or corynebacterium in 1 ~ 2 μm, shape, and draw ratio is less than or equal to 2；Room temperature is intact
Mouth impact flexibility average value is 21.8824J/cm2（By GB/T 229-2007 metal material Charpy pendulum impact test methods）,
Impact toughness sample fracture is in the typical ductile rupture of dimple feature；Intensity is 241.466MPa, elongation percentage 7.891%, is broken
Mouth is in the typical ductile rupture of dimple feature；Hardness is 74.98HV, electrical conductivity 31.70052%；In the 3.5% NaCl aqueous solution
In uniform corrosion rate when soaking 93 h at a temperature of 37 DEG C（Examination is soaked entirely by GB 1024-88 metal materials laboratory homogeneous corrosion
Proved recipe method）It is tiny for 0.321163 mm/y, corrosion surface Si phase sizes.
Embodiment three.
The high tough Al-Si-Cu systems cast aluminium alloy gold of a kind of Zr, Sr combined microalloying and Mn, Zn alloying, it is prepared
Method：
First by the pure Al of A00 grades（99.79%Al, 0.14%Fe, 0.04%Si）With Al-Si (89.62 %Al, 10.21%Si,
0.17% Fe, all components of the present invention represent that similarly hereinafter, the part that all components are added less than 100% is using mass percent
Impurity) intermediate alloy fusing after be warming up to 850 ± 10 DEG C, then sequentially add Al-Cu (49.62%Al, 50.12%Cu, 0.15%
Fe, 0.11%Si) intermediate alloy, Al-Mn (89.73%Al, 10.02%Mn, 0.19%Fe, 0.06%Si) intermediate alloy,
Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si) intermediate alloys and Al-Sr (89.86%Al, 9.89%Sr,
0.15%Fe, 0.10%Si) intermediate alloy, add 1.05% pure Zn after intermediate alloy to be added and pure Al thawings；Treat it is all in
Between after alloy and metal molten, adjust the temperature to 750 ± 10 DEG C, add carbon trichloride refining degasification until being escaped without gas,
Remove slag and pour into after 5 ~ 10 min of standing insulation and be preheated in 300 ± 10 DEG C of metal die ingot of casting；Obtain a kind of Zr,
The high tough Al-Si-Cu systems cast aluminium alloy gold of Sr combined microalloyings and Mn, Zn alloying.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds warp of Mn, Zn alloying
Spectrum it is actual measurement etc. composition be：8.24 %Si, 2.29%Cu, 0.484Mn %, 0.0029 %Mg, 1.05%Zn,
0.182%Zr, 0.0434 %Sr, 0.138 %Fe, surplus are aluminium and impurity element.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds group of Mn, Zn alloying
Densification is knitted, Si phases are tiny, and size is in granular form or corynebacterium in 1 ~ 2 μm, shape, and draw ratio is less than or equal to 2；Room temperature is intact
Mouth impact flexibility average value is 21.2461J/cm2（By GB/T 229-2007 metal material Charpy pendulum impact test methods）,
Impact toughness sample fracture is in the typical ductile rupture of dimple feature；Intensity is 248.2MPa, elongation percentage 8.022%, fracture
In the typical ductile rupture of dimple feature；Hardness is 75.12 HV, electrical conductivity 31.583572%；In the 3.5% NaCl aqueous solution
In uniform corrosion rate when soaking 93 h at a temperature of 37 DEG C（Examination is soaked entirely by GB 1024-88 metal materials laboratory homogeneous corrosion
Proved recipe method）It is tiny for 0.311289 mm/y, corrosion surface Si phase sizes.
Example IV.
The high tough Al-Si-Cu systems cast aluminium alloy gold of a kind of Zr, Sr combined microalloying and Mn, Zn alloying, it is prepared
Method：
First 850 ± 10 DEG C will be warming up to after the .175 grams of pure Al and 79.726 gram of Al-Si intermediate alloy fusing of A00 class 5s, Ran Houyi
Secondary addition gram 4.429 grams of Al-Cu intermediate alloys, 4.83 grams of Al-Mn intermediate alloys, 4.355 grams of Al-Zr intermediate alloys and 0.435
Gram Al-Sr intermediate alloys, intermediate alloy to be added and pure Al add 1.05 grams of pure Zn after melting；Treat all intermediate alloys and gold
After category fusing, 750 ± 10 DEG C are adjusted the temperature to, addition carbon trichloride refining degasification escapes up to without gas, standing insulation 5 ~
Remove slag and pour into after 10 min and be preheated in 300 ± 10 DEG C of metal die ingot of casting；Obtain the compound micro- conjunction of a kind of Zr, Sr
The high tough Al-Si-Cu systems cast aluminium alloy gold of aurification and Mn, Zn alloying.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds warp of Mn, Zn alloying
Spectrum it is actual measurement etc. composition be：8.14 %Si, 2.22 %Cu, 0.484Mn %, 0.0040%Mg, 1.05 %Zn,
0.179%Zr, 0.043%Sr, 0.137 %Fe, surplus are aluminium and impurity element.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds group of Mn, Zn alloying
Densification is knitted, Si phases are tiny, and size is in granular form or corynebacterium in 1 ~ 2 μm, shape, and draw ratio is less than or equal to 2；Room temperature is intact
Mouth impact flexibility average value is 21.8513J/cm2（By GB/T 229-2007 metal material Charpy pendulum impact test methods）,
Impact toughness sample fracture is in the typical ductile rupture of dimple feature；Intensity is 246.9MPa, elongation percentage 7.982%, fracture
In the typical ductile rupture of dimple feature；Hardness is 76.33 HV, electrical conductivity 32.65813%；In the 3.5% NaCl aqueous solution
In uniform corrosion rate when soaking 93 h at a temperature of 37 DEG C（Examination is soaked entirely by GB 1024-88 metal materials laboratory homogeneous corrosion
Proved recipe method）It is tiny for 0.321473 mm/y, corrosion surface Si phase sizes.
Embodiment five.
The high tough Al-Si-Cu systems cast aluminium alloy gold of a kind of Zr, Sr combined microalloying and Mn, Zn alloying, it is prepared
Method：
First 850 ± 10 DEG C will be warming up to after the 3.905 grams of pure Al and 80.705 gram of Al-Si intermediate alloy fusings of A00 grades, Ran Houyi
Secondary addition gram 4.569 grams of Al-Cu intermediate alloys, 4.88 grams of Al-Mn intermediate alloys, 4.452 grams of Al-Zr intermediate alloys and 0.449
Gram Al-Sr intermediate alloys, intermediate alloy to be added and pure Al add 1.04 grams of pure Zn after melting；Treat all intermediate alloys and gold
After category fusing, 750 ± 10 DEG C are adjusted the temperature to, addition carbon trichloride refining degasification escapes up to without gas, standing insulation 5 ~
Remove slag and pour into after 10 min and be preheated in 300 ± 10 DEG C of metal die ingot of casting；Obtain the compound micro- conjunction of a kind of Zr, Sr
The high tough Al-Si-Cu systems cast aluminium alloy gold of aurification and Mn, Zn alloying.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds warp of Mn, Zn alloying
Spectrum it is actual measurement etc. composition be：8.24 %Si, 2.29 %Cu, 0.489Mn %, 0.0049%Mg, 1.05 %Zn,
0.183%Zr, 0.0444Sr, 0.14 %Fe, surplus are aluminium and impurity element.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds group of Mn, Zn alloying
Densification is knitted, Si phases are tiny, and size is in granular form or corynebacterium in 1 ~ 2 μm, shape, and draw ratio is less than or equal to 2；Room temperature is intact
Mouth impact flexibility average value is 22.0156J/cm2（By GB/T 229-2007 metal material Charpy pendulum impact test methods）,
Impact toughness sample fracture is in the typical ductile rupture of dimple feature；Intensity is 247.4MPa, elongation percentage 8.143%, fracture
In the typical ductile rupture of dimple feature；Hardness is 76.39 HV, electrical conductivity 30.95743%；In the 3.5% NaCl aqueous solution
In uniform corrosion rate when soaking 93 h at a temperature of 37 DEG C（Examination is soaked entirely by GB 1024-88 metal materials laboratory homogeneous corrosion
Proved recipe method）It is tiny for 0.326498 mm/y, corrosion surface Si phase sizes.
Embodiment six.
The high tough Al-Si-Cu systems cast aluminium alloy gold of a kind of Zr, Sr combined microalloying and Mn, Zn alloying, it is prepared
Method：
First 850 ± 10 DEG C will be warming up to after the .496 grams of pure Al and 80.313 gram of Al-Si intermediate alloy fusing of A00 class 4s, Ran Houyi
Secondary addition gram 4.449 grams of Al-Cu intermediate alloys, 4.850 grams of Al-Mn intermediate alloys, 4.404 grams of Al-Zr intermediate alloys and 0.443
Gram Al-Sr intermediate alloys, intermediate alloy to be added and pure Al add 1.045 grams of pure Zn after melting；Treat all intermediate alloys and
After metal molten, 750 ± 10 DEG C are adjusted the temperature to, carbon trichloride refining degasification is added until being escaped without gas, stands insulation 5
Remove slag and pour into after ~ 10 min and be preheated in 300 ± 10 DEG C of metal die ingot of casting；It is compound micro- to obtain a kind of Zr, Sr
The high tough Al-Si-Cu systems cast aluminium alloy gold of alloying and Mn, Zn alloying.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds warp of Mn, Zn alloying
Spectrum it is actual measurement etc. composition be：8.20%Si, 2.25 %Cu, 0.486Mn %, 0.0039%Mg, 1.045 %Zn,
0.181%Zr, 0.0438Sr, 0.139 %Fe, surplus are aluminium and impurity element.
Zr, Sr combined microalloying of the present embodiment and the high tough Al-Si-Cu cast aluminium alloy golds group of Mn, Zn alloying
Densification is knitted, Si phases are tiny, and size is in granular form or corynebacterium in 1 ~ 2 μm, shape, and draw ratio is less than or equal to 2；Room temperature is intact
Mouth impact flexibility average value is 22.6848J/cm2（By GB/T 229-2007 metal material Charpy pendulum impact test methods）,
Impact toughness sample fracture is in the typical ductile rupture of dimple feature；Intensity is 246.9MPa, elongation percentage 7.8985%, fracture
In the typical ductile rupture of dimple feature；Hardness is 74.32 HV, electrical conductivity 33.11254%；In the 3.5% NaCl aqueous solution
In uniform corrosion rate when soaking 93 h at a temperature of 37 DEG C（Examination is soaked entirely by GB 1024-88 metal materials laboratory homogeneous corrosion
Proved recipe method）It is tiny for 0.299835 mm/y, corrosion surface Si phase sizes.
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 and Mn, Zn alloying, it is prepared
Method：
First by the pure Al of A00 grades（99.79%Al, 0.14%Fe, 0.04%Si and Al-Si (89.62 %Al, 10.21%Si,
0.17% Fe, all components of the present invention represent that similarly hereinafter, the part that all components are added less than 100% is using mass percent
Impurity) intermediate alloy fusing after be warming up to 850 ± 10 DEG C, then add Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe,
0.11%Si) intermediate alloy, intermediate alloy to be added and pure Al add pure Zn after melting；Treat that all intermediate alloys and metal melt
After change, 750 ± 10 DEG C are adjusted the temperature to, carbon trichloride refining degasification is added until being escaped without gas, stands insulation 5 ~ 10
Remove slag and pour into after min and be preheated in 300 ± 10 DEG C of metal die ingot of casting；One kind is obtained without the compound micro- conjunction of Zr and Sr
The Al-Si-Cu systems cast aluminium alloy gold of aurification.
The Al-Si-Cu systems cast aluminium alloy gold without Zr and Sr combined microalloyings of this comparative example through spectrum it is actual measurement into
It is divided into：8.5 %Si, 2.14 %Cu, 0.144%Fe, surplus are aluminium and impurity element.
The high tough Al-Si-Cu cast aluminium alloy golds without Zr, Sr combined microalloying and Mn, Zn alloying of this comparative example
And preparation method thereof dense structure（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 10.45422933 (14.09636)（By GB/T 229-2007 gold
Belong to material Charpy pendulum impact test method）, fracture is in the typical brittle fracture of Quasi cleavage feature（Fig. 8）；Intensity is 202.68
MPa, elongation percentage 5.824%, fracture are in the typical brittle fracture of Quasi cleavage feature（Fig. 9）；Hardness is 70.75HV, electrical conductivity
For 33.9224%；Average homogeneous corrosion rate after 93 h is soaked at a temperature of 37 DEG C in the 3.5% NaCl aqueous solution（By GB
1024-88 Uniform Corrosion Method of Laboratory Immersion Test methods）For 0.296661583 mm/y, corrosion surface Si phase sizes
It is thick（Figure 10）.
Part that the present invention does not relate to is identical with existing technology or can be realized using prior art.
Claims (3)
1. the high tough Al-Si-Cu systems cast aluminium alloy gold of a kind of Zr, Sr combined microalloying and Mn, Zn alloying, its feature exist
In：It is mainly by aluminium（Al）, silicon（Si）, copper（Cu）, manganese（Mn）, zinc（Zn）, zirconium（Zr）And strontium（Sr）Composition, wherein, silicon（Si）
Mass percent be 8.14~8.24 %, copper（Cu）Mass percent be 2.22~2.29%, manganese（Mn）Mass percent
For 0.484~0.489%, zinc（Zn）Mass percent be 1.04~1.05%, zirconium（Zr）Mass percent for 0.179~
0.183%, strontium（Sr）Mass percent be 0.043~0.0444%, 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 Al-Si-Cu systems casting of Zr, Sr combined microalloying and Mn, Zn alloying described in claim 1
The preparation method of aluminium alloy, it is characterized in that its preparation process includes successively：
（1）First, 850 ± 10 DEG C are warming up to after pure Al and Al-Si intermediate alloys are melted, is then sequentially added among Al-Cu
After alloy, Al-Mn intermediate alloys, Al-Zr intermediate alloys and Al-Sr intermediate alloys, intermediate alloy to be added and pure Al melt
Add pure Zn；
（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
Ingot is cast, that is, obtains the high tough Al-Si-Cu systems cast aluminium alloy gold of Zr, Sr combined microalloying and Mn, Zn alloying.
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 Mn in 50.12%, Al-Mn intermediate alloys
The mass percent that mass percent for Zr in 10.02%, Al-Zr intermediate alloys is Sr in 4.11%, Al-Sr intermediate alloys is
9.89%。
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