CN103614596A - High-strength aluminum alloy for electronic product structural component and preparation method therefor - Google Patents
High-strength aluminum alloy for electronic product structural component and preparation method therefor Download PDFInfo
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Abstract
The invention discloses a kind of high-strength aluminum alloy for an electronic product structural component and a preparation method therefor. The high-strength aluminum alloy structural component employs pressure casting molding and the aluminum alloy contains elements of aluminum, zinc and silicon. The hardness is more than 110HV5 and the elongation is more than 1%. The preparation method is as follows: raw materials according to certain ratios are placed in a resistance furnace and smelted, and the smelting temperature is 700-850 DEG C; the raw materials are stirred and mixed fully; after the smelting is finished, the temperature of the molten soup is adjusted to 600-800 DEG C; the alloy molten liquid is subjected to pressure casting into a metal die by utilization of a pressure casting machine, and the high-strength aluminum alloy sample is obtained; the obtained high-strength aluminum alloy is subjected to heat treatment or/and natural aging strengthening treatment. The high-strength aluminum alloy has advantages of excellent castability, high mechanical strength, stable size and the like. The alloy material is suitable for preparing product structural components with a wall thickness of being less than 0.6mm and with high precision, high intensity and high planeness, especially electronic product structural components.
Description
Technical field:
The present invention relates to aluminium alloy technical field, relate in particular to a kind of aldural of manufacturing electronic product structural part and preparation method thereof that is applicable to.
Background technology:
Along with the development of electronic product to miniaturization, intellectuality, lightness direction, the structural part of electronic product has also been proposed to more and more higher requirement.Traditional magnesium, aluminium, zinc, copper alloy are due to some characteristics of material itself, be difficult to meet the demand of electronic product development, for example: although magnesium alloy has light weight, feature that specific tenacity is large, but toughness of material, corrosion resistance and casting ability are relatively poor, be difficult to be less than for the manufacture of wall thickness thin-wall part and the higher product of obdurability of 0.6mm; Although common aluminum alloy good corrosion resistance, and can carry out the surface treatment that color is abundant, the physical strength of cast member is low, and material flowability is poor, is difficult to produce thin-wall part, and the thin-wall part planeness of producing is low; Although zinc alloy has excellent castability, the strength of materials is low, corrosion-resistant, is difficult to for the manufacture of anti-corrosion and high strength structural part; Although copper alloy intensity is high, good corrosion resistance, ability is cast in existence, material cost is high, and Product Precision is lower, the feature that consistence is poor.
The present invention studies discovery, having 110HV5(is the vickers hardness number 110 under 5Kg power condition) above hardness, elongation has the aluminum alloy materials of more than 1% deformability simultaneously, can effectively meet the demand of producing high-precision electronic product, can meet simultaneously electronic product especially thin-wall part electronic product to high-intensity demand.
Summary of the invention:
The object of this invention is to provide a kind of aldural and preparation method thereof, by adjustment, screen the content of Aluminum in Alloy, zinc and silicon, and add appropriate titanium, copper, manganese, magnesium and rare earth element, obtained there is castability excellence, physical strength is high, the aldural of dimensional stabilizing, this alloy material is applicable to manufacture wall thickness and is less than 0.6mm, precision is high, intensity good and planeness is high product structure part, particularly electronic product structural part.
Object of the present invention is achieved through the following technical solutions:
For an aldural for electronic product structural part, described aldural structural part adopts in pressure die casting moulding and alloy and contains aluminium, zinc, element silicon, and the hardness of this aldural is greater than 110HV5 and elongation is greater than 1%.
As technique scheme preferably, the chemical formula of described aldural is: AlaZnbSicMd, wherein M represents the combination of one or more elements in Tei, Cu, Mn, Mg, rare earth element, a, b, c, d are weight percentage, 13 ﹤ b ﹤ 34,2 ﹤ c ﹤ 12,0 ﹤ d ﹤ 6, a is surplus, and in alloy, contains inevitable impurity element.
As technique scheme preferably, in described aldural, the weight percentage of Ti element is less than 2%.
As technique scheme preferably, the weight percentage of described aldural rare earth elements is less than 1%.
As technique scheme preferably, in the impurity element of described aldural, the weight percentage of iron is less than 1%.
As technique scheme preferably, the alloy structure of described aldural has two phases or two weave constructions more than phase.
A preparation method for the aldural of electronic product structural part, comprises the following steps:
(1) in described aldural, contain aluminium, zinc, element silicon, wherein each element carries out proportioning;
(2) starting material after proportioning are put in resistance smelting furnace and smelted, smelting temperature is 700-850 ℃, and is uniformly mixed, and after having smelted, will melt soup temperature and adjust to 600-800 ℃;
(3) adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to described aldural sample, the aldural sample obtaining is heat-treated and/or natural aging intensive treatment.
As technique scheme preferably, the aldural sample obtaining is heat-treated, thermal treatment temp is lower than 200 ℃, the time is greater than 10 minutes.
As technique scheme preferably, the aldural sample obtaining is carried out to natural aging intensive treatment, the treatment time is greater than 12 hours.
As technique scheme preferably, the aldural sample obtaining is first heat-treated, thermal treatment temp is lower than 200 ℃, the time is greater than 10 minutes, then aldural sample is carried out to natural aging intensive treatment, the treatment time is greater than 12 hours.
Beneficial effect of the present invention is: aldural of the present invention has excellent casting ability, the foundry goods of producing has high planeness and physical strength, by thermal treatment process, can also adjust the mechanical property of material, be convenient to carry out follow-up Shape correction again and mechanical process, but also can be by the effective physical strength of reinforced alloys product of natural aging, thereby make electronic product structural part there is excellent non-deformability.Therefore, aldural of the present invention is suitable to be applied to manufacture wall thickness and to be less than 0.6mm, precision is high, intensity good and planeness is high electronic product structural part, especially the exploitation of low-cost complex precise thin-wall product structural part is had broad prospects.
Pressure die casting is the effective newly net forming method that is used for producing complex precise part in modern industry, and prepared electronic product structural part is that pressure die casting method prepares in the present invention.
Pressure die casting needs material to have high mobility, i.e. castibility, so that produce accurate complicated thin-wall product; The product needed that pressure die casting is produced is deviate from from mould, the friction resistance in the time of need to overcoming product and deviate from from mould, and the more complicated friction resistance of product is larger, and friction resistance can cause the distortion of product conventionally; For foundry goods, conventionally experience the violent temperature drop from high temperature to low temperature, thereby produce the thermal stresses of can not ignore, foundry goods also can produce distortion in various degree after die for molding is taken out; Therefore, the plane precision of product is to weigh Yi Ge manufacturing concern castings production ability important indicator.For cast material, require to have on the one hand high casting intensity, so that opposing deformation of products, can meet the demand of electronic product to high-strength structure part simultaneously, require on the other hand material to there is certain plastic deformation ability, so that foundry goods is carried out to redeformation manufacture, can meet the requirement of electronic product to structural part toughness simultaneously.For metallic substance, hardness corresponding to high intensity,, by the physical strength of hardness number evaluating material, as tensile strength, compressive strength, flexural strength, is therefore a kind of more rationally effectively evaluating means conventionally.
The present invention studies discovery, having 110HV5(is the vickers hardness number 110 under 5Kg power condition) above hardness, elongation has the aluminum alloy materials of more than 1% deformability simultaneously, can effectively meet the demand of producing high-precision electronic product, can meet simultaneously electronic product especially thin-wall part electronic product to high-intensity demand.
Thermal treatment can effectively regulate or improve the mechanical property of cast article, but high-temperature heat treatment, especially high temperature adds the gross distortion that quench treatment can cause product, and can amplify the casting flaw of product.
The present invention studies discovery, lower than the thermal treatments of 200 ℃, can not cause cast product distortion, can not amplify casting flaw yet, therefore the electronic product structural part that adopts aldural of the present invention to produce can carry out 200 ℃ of following low-temperature heat treatment, heat treatment time is greater than 10 minutes, so that regulate and improve the consistence of material property and the elongation index of material; Meanwhile, the aluminium alloy that can carry out natural aging strengthening for some also can carry out natural aging treatment, and the ageing treatment time be greater than 12 hours so that reach the hardness number of requirement of the present invention.
According to the Production requirement of electronic product structural part, also can carry out 200 ℃ of following low-temperature heat treatment and two kinds of combinations of natural aging treatment, to reach the index that requires of the present invention.
The castability of material depends primarily on the weave construction of composition and the material of material, if there is no in the present invention specified otherwise, the percentage composition of each element in alloy is all weight percentage.Aluminum silicon alloy has good castability and corrosion stability, proper amount of silicon content add the mobility that can effectively improve alloy melt, and can reduce the thermal expansivity of material, improve the hot cracking tendency in alloy casting process; Meanwhile, silicon form disperse distribution with hard particles in alloy exists, and can effectively improve the intensity of alloy material; But too high silicone content can make the elongation of material decline to a great extent, reduce the toughness of material; The present invention studies discovery, and the silicone content of 2-12% has best over-all properties to aluminium alloy of the present invention.
In the present invention, zinc element is important alloy element, and it can form two kinds of typical solid solution phases with aluminium element, one is the solid solution phase (a phase) that zinc is dissolved in aluminium mutually, a kind of is the solid solution phase (η phase) that aluminium is dissolved in zinc, and η forms eutectoid with a mutually conventionally mutually, and η phase zinc content is higher, fusing point is low, good fluidity, and a phase fusing point is high, belongs to strengthening phase, first solidify, mobility is relatively poor.The existence of low melting point phase, effectively improved the castability of material, the present invention is by the selection of the low melting point phase of fair amount, allow to adopt the form of pressure die casting to produce the thin-section casting that wall thickness is less than 0.6mm, and traditional cast aluminium alloy can only obtain wall thickness and is greater than the above foundry goods of 0.6mm; A is the solid solution phase of zinc in aluminium mutually, and the zinc content of solid solution is at low temperatures less than the solid solution capacity under hot conditions significantly, therefore be effective sosoloid strengthening phase, the present invention, by reasonably selecting content and the ratio of aluminum and zinc, has obtained the alloy matrix aluminum with high mechanical strength; In the present invention, zinc content is preferably greater than 13% and be less than 34%.
Meanwhile, the present invention, in order further to improve intensity and material metallurgy and the castability of alloy material, has further screened titanium, copper, manganese, magnesium and rare earth element as alloy element.
Copper, in alloy of the present invention, can form CuZn4 phase with zinc element, has 150 Vickers' hardness, belongs to hard crisp phase, has the effect of solution strengthening, can improve hardness and the intensity of alloy, thereby can effectively improve the non-deformability of foundry goods; Meanwhile, can also strengthen the solid solution strengthening effect of aluminium, magnesium, silicon phase, improve the intensity of material.Magnesium elements is the alloy element that effectively improves intensity of aluminum alloy, conventionally forms MgSi phase with silicon, can form effective strengthening phase, and can carry out natural aging strengthening; But low-alloyed creep strength and plasticity can fall in too high Mg content, and increase the hot crackability of alloy.Manganese element can form MnAl6 phase with aluminium element, and being distributed in alloy melt of disperse, stops the recrystallization process of aluminium alloy, plays the effect of crystal grain thinning; Meanwhile, manganese element can with melt in the middle of impurity iron element form (Fe, Mn) Al6 phase, effectively eliminate ferro element.The mechanical property that affects alloy that the meeting of Iron in Aluminium Alloy element is serious, especially the plasticity of material and toughness, simultaneously, iron and aluminium element form Al5Fe2 hard phase, and form scum silica frost, and inclusion is present in visual appearance and the mechanical property that can affect foundry goods in foundry goods, and iron level is preferably less than 1% in the present invention, otherwise can sharply affect plasticity and the toughness of material, and significantly reduce the erosion resistance of material.
Titanium elements can form non-spontaneous TiAl2 nucleus with aluminium element, the effective grain structure of refinement alloy of the present invention, the refinement of crystal grain is conducive to improve plasticity and the toughness of alloy, and can improve stability and the consistence of material property, it is the important alloy element of the present invention, but the mechanical property of the too high meeting of titanium content damaged material, in the present invention, titanium content is preferably less than 2%.Titanium elements adds with the form of aluminium titanium master alloy in the present invention.
Rare earth element is the important alloy element of aluminium alloy, during founding, can effectively reduce the condensate depression of melt, crystal grain thinning, and can reduce alloy melt in obnoxious flavour impurity, lower the surface tension of melt, improve the mobility of material, be conducive to improve the processing performance of material and the mechanical property of material, but during too high levels, again can coarsened grain, the mechanical property of infringement alloy.In the present invention, rare earth element is preferably lanthanum and cerium, and content is preferably and is less than 1%.
In the present invention, the element fusing points such as copper, silicon, manganese, titanium are significantly higher than the main element aluminum and zinc in alloy, and rare earth element is easy to oxidation, so in the present invention, copper, silicon, manganese, titanium, rare earth preferably adopt the form of master alloy to add, and are uniformly mixed fully in smelting process.
Meanwhile, consider the production cost of material, because highly purified starting material can cause the sharply rising of cost of alloy, so allow in the present invention to contain inevitably a small amount of impurity element in starting material, material purity is preferably greater than 99%.
Accompanying drawing explanation:
Fig. 1 is aldural sample stereographic map of the present invention;
Fig. 2 is embodiment 1 sample microstructure metallograph.
Embodiment:
In order to deepen the understanding of the present invention, below in conjunction with embodiment, the invention will be further described, and this embodiment only, for explaining the present invention, does not form limiting the scope of the present invention.In addition, in this manual, unless otherwise specified, content all represents quality percentage composition.
In the present invention, for the aldural of electronic product structural part, this aldural structural part adopts in pressure die casting moulding and alloy and contains aluminium, zinc, element silicon, and its hardness is greater than 110HV5 and elongation is greater than 1%, embodiment and comparative example is as follows.
Embodiment 1: by Al61Zn30Si6Cu2.8Ti0.1Ce0.1 alloying constituent, carry out alloy proportion, wherein copper, silicon, titanium, rare earth element adopt the form of AlCu, AlSi, AlTi, AlCe to carry out proportioning, other elements adopt the form proportioning of pure metal, and material purity is all greater than 99%.
Starting material after proportioning are put in resistance smelting furnace and smelted, and smelting temperature is 800 ℃, and carries out U and be fully uniformly mixed, and after having smelted, will melt soup temperature and adjust to 750 ℃.
Adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to sample as shown in Figure 1, product design is of a size of 150mm * 100mm * 6mm, and centre portions sheet gauge is 1mm, and foundry goods plane is carried out to 1 reversible deformation shaping.
Sample is carried out respectively to the test of Vickers' hardness, elongation and planeness on sclerometer, tensile testing machine, three-coordinates measuring machine, Vickers' hardness test adopt Shanghai optics electromechanical research 5KG multifunctional manual capstan head digital readout Vicker hardness tester test, test load is 5Kg; Tension test test adopts CTM2500 microcomputer controlled electronic universal tester to carry out Elongation test, during test, Fig. 1 sample is cut into standard model according to GB GB/T228-2002, and during test, rate of extension is 1mm/min, and test span is 50mm; Planeness adopts MQ564 three-coordinates measuring machine to detect, and planeness test is tested product after as cast condition product and shaping respectively; Meanwhile, sample is carried out to machinability processing test.Sample is carried out to microsection analysis, and as shown in Figure 2, test result is listed in table 1 to weave construction.
Embodiment 2: by Al75Zn14Si8Cu2.8Ti0.1Ce0.1 alloying constituent, carry out alloy proportion, wherein copper, silicon, titanium, rare earth element adopt the form of AlCu, AlSi, AlTdi, AlCe to carry out proportioning, other elements adopt the form proportioning of pure metal, and material purity is all greater than 99%.
Starting material after proportioning are put in resistance smelting furnace, smelted, smelting temperature is 800 ℃, and is fully uniformly mixed, and after having smelted, will melt soup temperature and adjust to 750 ℃.
Adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to sample as shown in Figure 1, product design is of a size of 150mm * 100mm * 6mm, and centre portions sheet gauge is 1mm, and foundry goods plane is carried out to 1 reversible deformation shaping.
Sample is carried out respectively to the test of Vickers' hardness, elongation and planeness on sclerometer, tensile testing machine, three-coordinates measuring machine, Vickers' hardness test adopt Shanghai optics electromechanical research 5KG multifunctional manual capstan head digital readout Vicker hardness tester test, test load is 5Kg; Tension test test adopts CTM2500 microcomputer controlled electronic universal tester to carry out Elongation test, during test, Fig. 1 sample is cut into standard model according to GB GB/T228-2002, and during test, rate of extension is 1mm/min, and test span is 50mm; Planeness adopts MQ564 three-coordinates measuring machine to detect, and planeness test is tested product after as cast condition product and shaping respectively; Meanwhile, sample is carried out to machinability processing test, test result is listed in table 1.
Embodiment 3: by Al61Zn30Si6Cu2.8Ti0.1Ce0.1 alloying constituent, carry out alloy proportion, wherein copper, silicon, titanium, rare earth element adopt the form of AlCu, AlSi, AlTi, AlCe to carry out proportioning, other elements adopt the form proportioning of pure metal, and material purity is all greater than 99%.
Starting material after proportioning are put in resistance smelting furnace, smelted, smelting temperature is 800 ℃, and is fully uniformly mixed, and after having smelted, will melt soup temperature and adjust to 750 ℃.
Adopt pressure die-casting machine, by above-mentioned alloy melt die casting in metal die, obtain sample as shown in Figure 1, product design is of a size of 150mm * 100mm * 6mm, and centre portions sheet gauge is 1mm, then sample is carried out to 180 ℃, the thermal treatment of 30 minutes, after thermal treatment, the hardness of material is reduced to 120Hv5 from 150Hv5, and elongation is increased to 2% from 1.1%, and the redeformation that can more be conducive to carry out product is processed.
Sample is carried out respectively to the test of Vickers' hardness, elongation and planeness on sclerometer, tensile testing machine, three-coordinates measuring machine, Vickers' hardness test adopt Shanghai optics electromechanical research 5KG multifunctional manual n capstan head digital readout Vicker hardness tester test, test load is 5Kg; Tension test test adopts CTM2500 microcomputer controlled electronic universal tester to carry out Elongation test, during test, Fig. 1 sample is cut into standard model according to GB GB/T228-2002, and during test, rate of extension is 1mm/min, and test span is 50mm; Planeness adopts MQ564 three-coordinates measuring machine to detect, and planeness test is tested product after as cast condition product and shaping respectively; Meanwhile, sample is carried out to machinability processing test.After having tested, sample is being carried out to reversible deformation shaping once, and then carrying out planeness test, test result is listed in table 1.
Embodiment 4: by Al71Zn20Si6Cu2.8Ti0.1Ce0.1 alloying constituent, carry out alloy proportion, wherein copper, silicon, titanium, rare earth element adopt the form of AlCu, AlSi, AlTi, AlCe to carry out proportioning, other elements adopt the form proportioning of pure metal, and material purity is all greater than 99%.
Starting material after proportioning are put in resistance smelting furnace, smelted, smelting temperature is 800 ℃, and is fully uniformly mixed, and after having smelted, will melt soup temperature and adjust to 750 ℃.
Adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to sample as shown in Figure 1, product design is of a size of 150mm * 100mm * 6mm, and centre portions sheet gauge is 1mm.
Sample is carried out respectively to the test of Vickers' hardness, elongation and planeness on sclerometer, tensile testing machine, three-coordinates measuring machine, Vickers' hardness test adopt Shanghai optics electromechanical research 5KG multifunctional manual capstan head digital readout Vicker hardness tester test, test load is 5Kg; Tension test test adopts CTM2500 microcomputer controlled electronic universal tester to carry out Elongation test, during test, Fig. 1 sample is cut into standard model according to GB GB/T228-2002, and during test, rate of extension is 1mm/min, and test span is 50mm; Planeness adopts MQ564 three-coordinates measuring machine to carry out n detection, and planeness test is tested product after as cast condition product and shaping respectively; Meanwhile, sample is carried out to machinability processing test, test result is listed in table 1.
Then sample is carried out to natural aging intensive treatment, the treatment time is 48 hours, then sample is carried out to hardness and planeness test, and hardness has 120HV5 to rise to 150HV5, and planeness does not change substantially.
Embodiment 5: by Al71Zn20Si6Cu2Ti0.5Mg0.2Mn0.10.1La0.1 alloying constituent, carry out alloy proportion, wherein copper, silicon, titanium, manganese, rare earth element adopt the form of AlCu, AlSi, AlTi, AlMn, AlLa to carry out proportioning, other elements adopt the form proportioning of pure metal, and material purity is all greater than 99%.
Starting material after proportioning are put in resistance smelting furnace, smelted, smelting temperature is 800 ℃, and is fully uniformly mixed, and after having smelted, will melt soup temperature and adjust to 750 ℃.
Adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to sample as shown in Figure 1, product design is of a size of 150mm * 100mm * 6mm, and centre portions sheet gauge is 1mm.
Sample is carried out respectively to the test of Vickers' hardness, elongation and planeness on sclerometer, tensile testing machine, three-coordinates measuring machine, Vickers' hardness test adopt Shanghai optics electromechanical research 5KG multifunctional manual capstan head digital readout Vicker hardness tester test, test load is 5Kg; Tension test test adopts CTM2500 microcomputer controlled electronic universal tester to carry out Elongation test, during test, Fig. 1 sample is cut into standard model according to GB GB/T228-2002, and during test, rate of extension is 1mm/min, and test span is 50mm; Planeness adopts MQ564 three-coordinates measuring machine to detect, and planeness test is tested product after as cast condition product and shaping respectively; Meanwhile, sample is carried out to machinability processing test, test result is listed in table 1.
Then sample is handled as follows to technique, to improve sample plane degree and the strength of materials: first sample is carried out to 180 ℃, the thermal treatment of 50 minutes, then tested for hardness value and elongation are respectively 112HV5 and 2.5%; Sample is carried out to reversible deformation shaping 1 time; Test planeness drops to 100um by 180um.Then sample is carried out to natural aging intensive treatment, the treatment time is 48 hours, then sample is carried out to hardness and planeness test, and hardness rises to 155HV5 by 112HV5 again, and planeness does not change substantially.
Comparative example 1: carry out alloy proportion by Al93.5Si5Cu1Mg0.5 alloying constituent, wherein copper, element silicon adopt the form of AlCu, AlSi to carry out proportioning, and other elements adopt the form proportioning of pure metal, and material purity is all greater than 99%.
Starting material after proportioning are put in resistance smelting furnace, smelted, smelting temperature is 800 ℃, and is fully uniformly mixed, and after having smelted, will melt soup temperature and adjust to 750 ℃.
Adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to sample as shown in Figure 1, product design is of a size of 150mm * 100mm * 6mm, and centre portions sheet gauge is 1mm, and foundry goods plane is carried out to 1 reversible deformation shaping.
Sample is carried out respectively to the test of Vickers' hardness, elongation and planeness on sclerometer, tensile testing machine, three-coordinates measuring machine, Vickers' hardness test adopt Shanghai optics electromechanical research 5KG multifunctional manual capstan head digital readout Vicker hardness tester test, test load is 5Kg; Tension test test adopts CTM2500 microcomputer controlled electronic universal tester to carry out Elongation test, during test, Fig. 1 sample is cut into standard model according to GB GB/Ts228-2002, and during test, rate of extension is 1mm/min, and test span is 50mm; Planeness adopts MQ564 three-coordinates measuring machine to detect, and planeness test is tested product after as cast condition product and shaping respectively; Meanwhile, sample is carried out to machinability processing test, test result is listed in table 1.
From test result, can find out, there is serious distortion in product, and product has lower physical strength.
Comparative example 2: carry out alloy proportion by Al61Zn22Si14Cu2.8Ti0.1Ce0.1 alloying constituent, wherein copper, silicon, titanium, rare earth element adopt the form of AlCu, AlSi, AlTi, AlCe to carry out proportioning, other elements adopt the form proportioning of pure metal, and material purity is all greater than 99%.
Starting material after proportioning are put in resistance smelting furnace, smelted, smelting temperature is 800 ℃, and is fully uniformly mixed, and after having smelted, will melt soup temperature and adjust to 750 ℃.
Adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to sample as shown in Figure 1, product design is of a size of 150mm * 100mm * 6mm, and centre portions sheet gauge is 1mm, and foundry goods plane is carried out to 1 reversible deformation shaping.
Sample is carried out respectively to the test of Vickers' hardness, elongation and planeness on sclerometer, tensile testing machine, three-coordinates measuring machine, Vickers' hardness test adopt Shanghai optics electromechanical research 5KG multifunctional manual capstan head digital readout Vicker hardness tester test, test load is 5Kg; Tension test test adopts CTM2500 microcomputer controlled electronic universal tester to carry out Elongation test, during test, Fig. 1 sample is cut into standard model according to GB GB/T228-2002, and during test, rate of extension is 1mm/min, and test span is 50mm; Planeness adopts MQ564 three-coordinates measuring machine to detect, and planeness test is tested product after as cast condition product and shaping respectively; Meanwhile, sample is carried out to machinability processing test, test result is listed in table 1.
From test result, can find out, product is because hardness is larger, and intensity is higher, although product as cast condition planeness is higher, is difficult to shaping, and product is easy to cracking in moulding and shaping process, in smear metal processing test, be difficult to carry out tapping processing, Cutting Tool Damage is serious.
Comparative example 3: carry out alloy proportion by Anl60Zn30Si6Cu2.8Ti0.1Ce1.1 alloying constituent, wherein copper, silicon, titanium, rare earth element adopt AlCu, AlSi, AlTi, AlCe form to carry out proportioning, other elements adopt the form proportioning of pure metal, and material purity is all greater than 99%.
Starting material after proportioning are put in resistance smelting furnace, smelted, smelting temperature is 800 ℃, and is fully uniformly mixed, and after having smelted, will melt soup temperature and adjust to 750 ℃.
Adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to sample as shown in Figure 1, product design is of a size of 150mm * 100mm * 6mm, and centre portions sheet gauge is 1mm, and foundry goods plane is carried out to 1 reversible deformation shaping.
Sample is carried out respectively to the test of Vickers' hardness, elongation and planeness on sclerometer, tensile testing machine, three-coordinates measuring machine, Vickers' hardness test adopt Shanghai optics electromechanical research 5KG multifunctional manual capstan head digital readout Vicker hardness tester test, test load is 5Kg; Tension test test adopts CTM2500 microcomputer controlled electronic universal tester to carry out Elongation test, during test, Fig. 1 sample is cut into standard model according to GB GB/T228-2002, and during test, rate of extension is 1mm/min, and test span is 50mm; Planeness adopts MQ564 three-coordinates measuring machine to detect, and planeness test is tested product after as cast condition product and shaping respectively; Meanwhile, sample is carried out to machinability processing test, test result is listed in table 1.
From test result, can find out, product is because hardness is larger, and intensity is higher, although product as cast condition planeness is higher, is difficult to shaping, and product is easy to cracking in moulding and shaping process, Cutting Tool Damage is serious, and toughness of products is lower simultaneously, easily produces and falls the product defectses such as cracking.
Comparative example 4: carry out alloy proportion by Al66Zn30Si1Cu2.8Ti0.1Ce0.1 alloying constituent, wherein copper, silicon, titanium, rare earth element adopt AlCu, AlSi, AlTi, AlCe form to carry out proportioning, other elements adopt the form proportioning of pure metal, and material purity is all greater than 99%.
Starting material after proportioning are put in resistance smelting furnace, smelted, smelting temperature is 800 ℃, and is fully uniformly mixed, and after having smelted, will melt soup temperature and adjust to 750 ℃.
Adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to sample as shown in Figure 1, product design is of a size of 150mm * 100mm * 6mm, and centre portions sheet gauge is 1mm, and foundry goods plane is carried out to 1 reversible deformation shaping.
Sample is carried out respectively to the test of Vickers' hardness, elongation and planeness on sclerometer, tensile testing machine, three-coordinates measuring machine, Vickers' hardness test adopt Shanghai optics electromechanical research 5KG multifunctional manual capstan head digital readout Vicker hardness tester test, test load is 5Kg; Tension test test adopts CTM2500 microcomputer controlled electronic universal tester to carry out Elongation test, during test, Fig. 1 sample is cut into standard model according to GB GB/T228-2002, and during test, rate of extension is 1mm/min, and test span is 50mm; Planeness adopts MQ564 three-coordinates measuring machine to detect, and planeness test is tested product after as cast condition product and shaping respectively; Meanwhile, sample is carried out to machinability processing test, test result is listed in table 1.
Test result shows that hardness and the planeness of product have all shown good characteristic, and product has good plastic deformation ability and Research on Cutting Characteristics.But find, under same casting technological parameter condition, it is complete that product is difficult to moulding, easily produces casting flaw, thereby affect the appearance looks elegant of product, and be difficult to produce thinner foundry goods in die cast process.
Comparative example 5: carry out alloy proportion by Al61Zn27Si6Cu2.8Ti3.1Ce0.1 alloying constituent, wherein copper, silicon, titanium, rare earth element adopt AlCu, AlSi, AlTi, AlCe form to carry out proportioning, other elements adopt the form proportioning of pure metal, and material purity is all greater than 99%.
Starting material after proportioning are put in resistance smelting furnace, smelted, smelting temperature is 800 ℃, and is fully uniformly mixed, and after having smelted, will melt soup temperature and adjust to 750 ℃.
Adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to sample as shown in Figure 1, product design is of a size of 150mm * 100mm * 6mm, and centre portions sheet gauge is 1mm, and foundry goods plane is carried out to 1 reversible deformation shaping.
Sample is carried out respectively to the test of Vickers' hardness, elongation and planeness on sclerometer, tensile testing machine, three-coordinates measuring machine, Vickers' hardness test adopt Shanghai optics electromechanical research 5KG multifunctional manual capstan head digital readout Vicker hardness tester test, test load is 5Kg; Tension test test adopts CTM2500 microcomputer controlled electronic universal tester to carry out Elongation test, during test, Fig. 1 sample is cut into standard model according to GB GB/T228-2002, and during test, rate of extension is 1m/min, and test span is 50mm; Planeness adopts MQ564 three-coordinates measuring machine to detect, and planeness test is tested product after as cast condition product and shaping respectively; Meanwhile, sample is carried out to machinability processing test, test result is listed in table 1.
Test result shows that hardness and the planeness of product have all shown good characteristic, but product plastic deformation ability sharply worsens, and product is difficult to cutting, and the consistence of product is also greatly affected.
From embodiments of the invention and comparative example, can find out, aldural of the present invention has excellent casting ability, the foundry goods of producing has high planeness and physical strength, by thermal treatment process, can also adjust the mechanical property of material, be convenient to carry out follow-up Shape correction again and mechanical process, but also can be by the effective physical strength of reinforced alloys product of natural aging, thereby make electronic product structural part there is excellent non-deformability.Therefore, the suitable electronic product structural part that is applied to of aldural of the present invention, especially has broad prospects to the exploitation of low-cost complex precise thin-wall product structural part.
Table 1
Claims (10)
1. the aldural for electronic product structural part, it is characterized in that: described aldural structural part adopts in pressure die casting moulding and alloy and contains aluminium, zinc, element silicon, and the hardness of this aldural is greater than 110HV5 and elongation is greater than 1%.
2. a kind of aldural for electronic product structural part according to claim 1, it is characterized in that: the chemical formula of described aldural is: AlaZnbSicMd, wherein M represents the combination of one or more elements in Ti, Cu, Mn, Mg, rare earth element, a, b, c, d are weight percentage, 13 ﹤ b ﹤ 34,2 ﹤ c ﹤ 12,0 ﹤ d ﹤ 6, a is surplus, and in alloy, contains inevitable impurity element.
3. a kind of aldural for electronic product structural part according to claim 2, is characterized in that: in described aldural, the weight percentage of Ti element is less than 2%.
4. a kind of aldural for electronic product structural part according to claim 2, is characterized in that: the weight percentage of described aldural rare earth elements is less than 1%.
5. a kind of aldural for electronic product structural part according to claim 2, is characterized in that: in the impurity element of described aldural, the weight percentage of iron is less than 1%.
6. a kind of aldural for electronic product structural part according to claim 2, is characterized in that: the alloy structure of described aldural has two phases or two weave constructions more than phase.
7. for a preparation method for the aldural of electronic product structural part, it is characterized in that: comprise the following steps:
(1) in described aldural, contain aluminium, zinc, element silicon, wherein each element carries out proportioning;
(2) starting material after proportioning are put in resistance smelting furnace and smelted, smelting temperature is 700-850 ℃, and is uniformly mixed, and after having smelted, will melt soup temperature and adjust to 600-800 ℃;
(3) adopt pressure die-casting machine, above-mentioned alloy melt die casting, in metal die, is obtained to described aldural sample, the aldural sample obtaining is heat-treated and/or natural aging intensive treatment.
8. the preparation method of a kind of aldural according to claim 7, is characterized in that: the aldural sample obtaining is heat-treated, and thermal treatment temp is lower than 200 ℃, and the time is greater than 10 minutes.
9. the preparation method of a kind of aldural according to claim 7, is characterized in that: the aldural sample obtaining is carried out to natural aging intensive treatment, and the treatment time is greater than 12 hours.
10. the preparation method of a kind of aldural according to claim 7, it is characterized in that: the aldural sample obtaining is first heat-treated, thermal treatment temp is lower than 200 ℃, time is greater than 10 minutes, then aldural sample is carried out to natural aging intensive treatment, the treatment time is greater than 12 hours.
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