CN104057067B - A kind of method suppressing magnesium/Al bimetal liquid-solid composite interfacial brittle compound - Google Patents
A kind of method suppressing magnesium/Al bimetal liquid-solid composite interfacial brittle compound Download PDFInfo
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Abstract
The invention discloses a kind of method suppressing magnesium/Al bimetal liquid-solid composite interfacial brittle compound, feature is to use zincate process and electroplating technology to carry out surface preparation by with the addition of the solid aluminium alloy workpiece that percentage by weight is 7.5% cheap elements Si, then die casting liquid magnesium alloy on solid aluminium alloy workpiece, form the Mg/Al bimetallic plied timber of magnesium cladding aluminum, it is placed in chamber type electric resistance furnace and is incubated 2 3h in 410 430 DEG C, then take out air cooling to room temperature, the Mg/Al bimetallic plied timber that i.e. acquisition Interface Microstructure performance optimizes.The inventive method technique is simple, is adapted to prepare complex-shaped Mg/Al bimetallic plied timber, can be used to produce the parts such as automobile engine cylinder head, crankcase and gear-box.
Description
Technical field
The invention belongs to non-ferrous metals casting method and technology field, be specifically related to suppress magnesium alloy and silicon aluminum alloy
The method of liquid-solid composite interfacial brittle compound.
Background technology
Economizing on resources and reducing environmental pollution is World Auto Industry circle two large problems urgently to be resolved hurrily, automobile light weight
Change is to realize energy-conservation and environmental protection effective way.Automotive light weight technology for save the energy, reduce discharge, realize can
Sustainable development strategy has the most positive meaning.The development of automotive light weight technology technology promote Cast aluminium alloy gold and
The further investigation of magnesium alloy and application, also propose requirements at the higher level to aluminium alloy and magnesium-alloy material quality simultaneously.
As the lightest novel green structural timber, aboundresources, density is low, damping subtracts owing to having for magnesium alloy
Noise reduction capability of shaking is strong and is prone to the advantages such as regeneration, in fields such as Aero-Space, auto industry, telecommunications
Suffer from wide application prospect.The most excellent yet with corrosion resistance of magnesium alloy difference and mechanical behavior under high temperature
Different, cause its application in the field such as automobile and aviation to receive and restrict significantly.Aluminium alloy also has relatively
High specific strength also has good surface modificability, and aluminum surface is easily formed the oxide-film of densification simultaneously, has
Well corrosion resistance.In various light metals, aluminium alloy is still in occupation of leading position at present, if closed by magnesium
Gold and these two kinds of dissimilar metals of aluminium alloy combine, and form magnesium/aluminum plied timber, give full play to both each
From performance advantage, can be more widely used in above multiple fields.
At present, the domestic and international composite joint about Mg/Al bimetal structure is many to be realized by welding method, main
The methods such as gas tungsten arc welding to be had (TIG weldering), Laser Welding, soldering, diffusion welding (DW).But magnesium and aluminum
Chemical property is relatively more active, there will be the defects such as oxidation, crackle and pore in welding process.Simultaneously because aluminum
Alloy and magnesium alloy broadly fall into eutectic alloy, and during composite joint, interface easily produces a large amount of frangible compounds, sternly
Heavily reduce the binding ability of Mg/Al plied timber.
In recent years, BMW AG of Germany develops a kind of Mg/Al bimetal composite first and starts
Machine crankshaft casing.According to U.S.'s " international automobile IEEE technical papers " (SAE Technical Papers,
2006,01,0069) " the Mg-Al composite crankcase of BMW, state-of-the-art light metal casting and manufacturing industry "
(BMW’s Magnesium-Aluminium Composite Crankcase,State-of-the-Art Light Metal
Casting and Manufacturing) middle introduction, the inner liner portion of this Mg/Al compound camshaft casing uses aluminum
Alloy material manufactures, including cylinder barrel working surface, water jacket, crankshaft main bearing pedestal together with its threaded connection place and
Cylinder cap threaded connection place etc..Then magnesium cladding aluminum is formed by pressure casting method diecast magnesium alloy on aluminium alloy lining
Mg/Al compound camshaft casing.This composite structural part gives full play to both aluminium alloy and magnesium alloy
Respective performance advantage.Liner aluminium alloy meets the requirement of engine cylinder-body service behaviour, peripheral magnesium alloy knot
Structure achieves the loss of weight of crankcase.This new method utilizing extrusion process to produce Mg/Al plied timber,
Belonging to " liquid-solid casting combination process ", the mass production that this technique is Mg/Al bimetallic composite component provides
A kind of new approach.
Magnalium liquid-solid casting bimetal compound interface the most easily produces frangible compounds.When liquid magnesium and solid aluminium
Compound tense, its interface makes alloying element phase counterdiffusion and enrichment due to heat effect, even more so that solid aluminium alloy
Local, surface is micro-molten, causes being greatly increased containing Al amount in the Mg aluminium alloy of interface.According to Al-Mg alloy
Phasor understands, and after the Mg aluminium alloy solidification that the amount containing Al is high, can produce substantial amounts of fragility in its solidified structure
Compound Al12Mg17And Al3Mg2.These substantial amounts of frangible compounds are it could even be possible to become matrix, seriously
Reduce the bond strength of Mg/Al bimetallic compound interface, considerably increase interfacial brittle.Therefore, research
A kind of method suppressing Mg/Al bimetallic liquid-solid compound interface frangible compounds to be formed, prepares interface cohesion
The Mg/Al bimetallic plied timber of excellent performance, extensively should to magnesium, aluminum and alloy xenogenesis plied timber thereof
With significant.
Summary of the invention
The purpose of the present invention is to propose to a kind of side suppressing Mg/Al bimetallic liquid-solid compound interface frangible compounds
Method, to overcome the shortcoming that existing Mg/Al bimetallic liquid-solid composite joint boundary strength is low, fragility is big, effectively
Reduce the frangible compounds in compound interface, it is thus achieved that the Mg/Al bimetallic plied timber that Interface Microstructure performance optimizes,
The use requirement aborning of Mg/Al xenogenesis composite construction can be met.
The present invention suppresses the method for Mg/Al bimetallic liquid-solid compound interface frangible compounds, it is characterised in that
Concrete operation step is as follows:
The first step, elder generation add cheap elements Si in aluminium alloy: after being completely melt by commercial aluminum alloy, add weight
The industrial crystallization silicon of amount percentage ratio 7.5%, after all dissolving, is stirred, so that its homogenization, then dragging for
Remove the residue on aluminium alloy surface, be poured into immediately in metal mold or sand mold and carry out gravitational casting formation solid aluminium alloy
Workpiece；
Second step, the solid aluminium alloy workpiece of above-mentioned formation use zincate process and electroplating technology carry out surface
Pretreatment: first solid aluminium alloy surface is polishing to surface smoothness >=6 grade, then uses concentration of volume percent
For the alcohol washes of 55%-60%, then clean with distilled water；Again solid aluminium alloy workpiece is soaked in acetone
Carry out ultrasonic waves for cleaning；Again solid aluminium alloy workpiece is put into 60-80 DEG C containing 20g/L sodium hydroxide and 5g/L
The mixed solution of sodium fluoride soaks 5-10s, then takes out in immersion distilled water and clean；Again by solid aluminium alloy
Workpiece is put into by the concentrated nitric acid that concentration expressed in percentage by weight is 65% and Fluohydric acid. that concentration expressed in percentage by weight is 40% with body
Long-pending ratio soaks 5-10s in the mixed solution for 3:1 preparation, clean with distilled water after taking-up；Then by solid aluminium
Alloy workpiece be immersed in 25-30 DEG C containing 320g/L sodium hydroxide, 50g/L zinc oxide, 10g/L tartaric acid
The mixed solution of potassium sodium and 1g/L ferric chloride soaks 30-45s, further takes out and clean with distilled water；Finally will
Solid aluminium alloy workpiece after cleaning put into prepare in advance containing 200g/L potassium chloride, 60g/L zinc chloride and
In the mixed solution of 20g/L boric acid, with current intensity as 0.5-5A/dm2, 20-30 DEG C electroplate 10-15min；
3rd step, it is 3-7 in mass ratio by solid aluminium alloy workpiece and the magnesium alloy through above-mentioned surface preparation:
1 is respectively placed in same two ends sealable external diameter 55mm, internal diameter 50mm, the quartzy tube chamber of long 570mm
(A) both sides in, wherein solid aluminium alloy workpiece (B) is placed on quartz one of tube chamber (A) interior side and may move
Pallet (C) in, magnesium alloy (D) be placed in quartz tube chamber (A) interior opposite side an internal diameter 6-8mm, long 290mm
Little quartz ampoule (E) in, by device two ends seal, first use mechanical pump to quartz tube chamber (A) evacuation be no less than
15min, then use molecular pump to be evacuated to be not less than 5 × 10-3Pa, is re-filled with noble gas Ar extremely afterwards
0-0.12Mpa；
4th step, control are placed in quartz tube chamber (A) resistance furnace (G) heated quartz tube chamber (A) outward to 650 DEG C
～after 700 DEG C, solid aluminium alloy workpiece (B) is moved to quartz tube chamber (A) central authorities and is positioned at little quartz ampoule by mobile pallet (C)
(E) after the underface of loophole is preheating to design temperature 550 DEG C-580 DEG C, then by the graphite in little quartz ampoule (E)
The liquid magnesium alloy (D) of fusing is squeezed and drops on solid aluminium alloy workpiece (B) by " piston " (F), it is achieved the double gold of Mg/Al
Belong to liquid-solid composite, with will this Mg/Al bimetallic plied timber air cooling zone of moving to quartz ampoule intracavity side cold
But to less than 100 DEG C, it is thus achieved that the Mg/Al bimetallic plied timber that interface cohesion is good；
5th step, the Mg/Al bimetallic plied timber of above-mentioned formation is again heated to 410 DEG C-430 DEG C, protects
Temperature 2-3h, then takes out Mg/Al bimetallic plied timber air cooling to room temperature, i.e. obtains Interface Microstructure performance excellent
The Mg/Al bimetallic plied timber changed.
Compared with existing Mg/Al bimetallic plied timber, the above-mentioned process of the present invention is due at aluminium alloy
The cheap elements Si of middle interpolation, utilizes Si Yu Mg to form Mg at compound interface2Si continuous phase, thus effectively suppress
The generation of Mg/Al bimetallic liquid-solid compound interface frangible compounds, forms good metallurgical bonding interface.Simultaneously
Continuous N g can be made by heat treatment method2Si phase in version is tiny, subglobose Mg2Si phase, it is achieved that boundary
The solution strengthening in face, the final Interface Microstructure performance that obtains obtains the bimetallic joint product of optimization.With other
Mg/Al welding method is compared, and uses the inventive method that the shear strength of combination interface can be made to bring up to
74.5MPa, it is possible to meet the use requirement to Mg/Al bimetallic composite component in commercial production.Side of the present invention
Method technological operation simplicity, low cost, practical, can be used for preparing complex-shaped Mg/Al bimetallic cladding
Material.The present invention adds the content percentage by weight preferably Si7.5% of Si in solid aluminium alloy workpiece can be made
The Mg/Al bimetallic plied timber obtained has higher comprehensive mechanical property.
The method of this suppression Mg/Al bimetallic liquid-solid compound interface frangible compounds that the present invention proposes, it sets
Meter theoretical foundation be in solid aluminium alloy addition silicon addition, formed aluminum silicon binary alloy (hypoeutectic or
Transcocrystallized Al-Si alloy)；When liquid Mg is combined the solid aluminium alloy containing Si, due to interface thermal diffusion (or office
Portion is micro-molten) caused, the Si in aluminium alloy can diffuse in Mg aluminium alloy so that in the Mg aluminium alloy of interface
Si content is greatly increased.According to " Si-Ca alloy in solidification principle and China's " Special Processes of Metal Castings and non-ferrous alloy "
On AM60 magnesium alloy in course of solidification and the impact of microscopic structure " research shows: during the solidification of Mg aluminium alloy containing Si,
Mg2Si meets and first separates out from Mg aluminium alloy.And according to Britain's " material journal " (Acta Materialia,
2007,55,3815-3823) " crystal structure of β ' phase in Al-Mg-Si alloy " (The crystal structure
Ofthe β ' phase in Al Mg Si alloys) research show Mg2There is good coherence pair in Si phase and solid aluminum
Should be related to, Mg2(001) interface of Si forms coherent boundary with Al (100) interface.Therefore, Mg/Al circle
First the Mg separated out when solidifying containing Si liquid magnesium alloy at face2Si meets and depends on the continuous of aluminum interface formation strip
Mg2Si layer.This strip continuous N g2Si layer forms a barrier, can effectively hinder Al in solid aluminium alloy
Element is to the diffusion of Mg aluminium alloy side, thus reduces measuring containing Al in the Mg aluminium alloy of interface so that it is solidification
After the frangible compounds that separates out in interface greatly reduce, thus interfacial brittle can be reduced.It should be noted that
Although strip continuous N g2Si layer effectively prevents the precipitation of frangible compounds, but interface strip continuous N g2Si
Layer also has adverse influence to Interface Microstructure and performance, if by strip continuous N g2Si phase in version isolates for group's ball
Mg2Si phase, it will improve the microstructure and property at interface further.On the one hand strip can be made even by heat treatment
Continuous Mg2Si phase in version is tiny, subsphaeroidal and the Mg of Dispersed precipitate2Si granule, on the other hand can realize interface
Aluminum, the solution strengthening of magnesium matrix, thus improve the bond strength at interface.Finally made by above-mentioned invention design
The structure property at Mg/Al liquid-solid composite interface is optimized, thus improves the shear strength of combination interface.
The present invention uses zincic acid by with the addition of the solid aluminium alloy workpiece that percentage by weight is 7.5% cheap elements Si
Salt technique and electroplating technology carry out surface preparation, then die casting liquid magnesium alloy on solid aluminium alloy workpiece,
Form the Mg/Al bimetallic plied timber of magnesium cladding aluminum, be placed in chamber type electric resistance furnace in 410-430 DEG C of insulation
2-3h, then takes out air cooling and simply, is adapted to prepare complex-shaped Mg/Al bimetallic to room temperature, technique
Plied timber, can be used to produce the parts such as automobile engine cylinder head, crankcase and gear-box.
Accompanying drawing explanation
Fig. 1 is magnesium/Al bimetal liquid-solid composite experimental provision schematic diagram.
Fig. 2 is that SIRION200 scanning electron microscope (SEM) observes lower AZ31/A380 liquid-solid composite interface
Microstructure picture.
Fig. 3 is through 420 DEG C, micro-group of the AZ31/A380 liquid-solid composite interface after insulation 3h Isothermal treatment
Knit photo.
Fig. 4 is that SIRION200 scanning electron microscope (SEM) observes lower AZ31/AlSi17 liquid-solid composite interface
Microstructure picture.
Fig. 5 is through 430 DEG C, is incubated the micro-of the AZ31/AlSi17 liquid-solid composite interface after 2h Isothermal treatment
Macrograph.
Detailed description of the invention
By the following examples and combine accompanying drawing implementing process and the effect of the present invention are further elaborated.
The term used, in addition to having additionally explanation, is typically what those of ordinary skill in the art can be generally understood that
Implication.
Embodiment 1:
By the 2g solid aluminium alloy workpiece of the magnesium alloy (AZ31) of 300mg with 20mmx15mmx4mm, (Asia is altogether
Brilliant alusil alloy A380, the mass fraction of Si is 7.5%) carry out liquid-solid composite connection, specifically comprise the following steps that
Before carrying out liquid-solid composite, first to the addition of the cheap element that percentage by weight is 7.5% in aluminium alloy
The surface of the solid aluminium alloy workpiece of Si carries out pretreatment: first polish smooth with levigator, to surface smoothness 6
Level, is then the alcohol washes of 60% with concentration of volume percent, then cleans 10s with distilled water；Again by solid
Al alloy parts soaks the ultrasonic waves for cleaning carried out in acetone 5 minutes；Again solid aluminium alloy workpiece is immersed temperature
Degree is to soak 10s in the mixed solution containing 20g/L sodium hydroxide and 5g/L sodium fluoride of 60 DEG C, then takes out
5s is cleaned with distilled water；Again solid aluminium alloy workpiece is put into by the concentrated nitric acid that concentration expressed in percentage by weight is 65% and
Concentration expressed in percentage by weight be 40% the mixed solution prepared with volume ratio for 3:1 of Fluohydric acid. in soak 10s, take out
5s is cleaned afterwards with distilled water；Then solid aluminium alloy workpiece is immersed in 25 DEG C containing 320g/L sodium hydroxide,
The mixed solution of 50g/L zinc oxide, 10g/L sodium potassium tartrate tetrahydrate and 1g/L ferric chloride soaks 30s, then takes
Go out and clean 5s with distilled water；Solid aluminium alloy workpiece after finally cleaning puts into containing of preparing in advance
In the mixed solution of 200g/L potassium chloride, 60g/L zinc chloride and 20g/L boric acid, with current intensity it is
0.5A/dm2, 20 DEG C electroplate 15min.
Fig. 1 is magnesium/Al bimetal liquid-solid composite experimental provision schematic diagram.Experimental provision is as shown in fig. 1: will pass through
The solid aluminium alloy workpiece of above-mentioned surface preparation and magnesium alloy are respectively placed in the sealable external diameter in same two ends
55mm, internal diameter 50mm, long 570mm quartzy tube chamber (A) in both sides, wherein solid aluminium alloy workpiece (B) is put
In quartz tube chamber (A) in a moveable pallet (C) of side, magnesium alloy (D) is placed in quartz tube chamber (A)
One internal diameter 8mm of interior opposite side, long 290mm little quartz ampoule (E) in, by device two ends seal, first use
Mechanical pump is to quartz tube chamber (A) evacuation 15min, then uses molecular pump to be evacuated to 5 × 10-3Pa, fills the most again
Enter noble gas Ar (percentage by volume 99.99%) to 0.12Mpa.Control to be placed in stone by computer program again
English tube chamber (A) resistance furnace (G) heated quartz tube chamber (A) outward is to after 700 DEG C, and solid aluminium is closed by mobile pallet (C)
Metal working part (B) moves to quartz tube chamber (A) central authorities and is positioned at the underface of little quartz ampoule (E) loophole and is preheating to design temperature
After 580 DEG C, then dropped in crowded for the liquid magnesium alloy (D) of fusing by the graphite " piston " (F) in little quartz ampoule (E)
On solid aluminium alloy workpiece (B), it is achieved Mg/Al bimetallic liquid-solid composite, with will this Mg/Al bimetallic cladding
Material moves to the air cooling zone of quartz ampoule intracavity side and is cooled to less than 100 DEG C, it is thus achieved that the Mg/Al that interface cohesion is good
Bimetallic plied timber.
The Mg/Al bimetallic plied timber of above-mentioned formation being again heated to 420 DEG C, is incubated 3h, insulation completes
After, take out Mg/Al bimetallic plied timber air cooling to room temperature, the i.e. Mg/Al of acquisition Interface Microstructure performance optimization
Bimetallic plied timber.
Fig. 2 is that SIRION200 scanning electron microscope (SEM) observes lower AZ31/A380 liquid-solid composite interface
Microphotograph, as can be seen from the figure defines a continuous print black bar in the interface near solid aluminum side
Shape Mg2Si phase, and define a small amount of dendritic crystalline frangible compounds in the boundary zone near magnesium alloy side.
Fig. 3 is through 420 DEG C, micro-group of the AZ31/A380 liquid-solid composite interface after insulation 3h Isothermal treatment
Knit photo, it can be seen that with micro-group of the most thermally treated AZ31/A380 bimetallic plied timber
Knit figure (Fig. 2) to compare, interface continuous print strip Mg2Si phase is dissolved, and is changed into tiny, subsphaeroidal
Mg2Si phase.The Mg of these Dispersed precipitate2Si phase serves the effect of interface enhancing, to the combination improving interface
Intensity is favourable.The shear strength of the Mg/Al bimetallic plied timber finally obtained is 73MPa.If
The percentage by weight adding Si in solid aluminium alloy workpiece is changed, in the range of 410-430 DEG C in the range of 7.5%-17%
Change the heating-up temperature of heat treatment, the effect identical with the above results can be obtained.
Embodiment 2:
The magnesium alloy (AZ31) of 300mg is (the most common with the 2g solid aluminium alloy workpiece of 20mmx15mmx4mm
Brilliant alusil alloy AlSi17, is 17% containing Si mass fraction) carry out liquid-solid composite connection, specifically comprise the following steps that
Before carrying out liquid-solid composite, first to the addition of the cheap element that percentage by weight is 17% in aluminium alloy
The surface of the solid aluminium alloy workpiece of Si carries out pretreatment: first polish smooth with levigator, to surface smoothness 6
Level, is then the alcohol washes of 59% with concentration of volume percent, then cleans 10s with distilled water；Again by solid
Al alloy parts soaks the ultrasonic waves for cleaning carried out in acetone 5 minutes；Again solid aluminium alloy workpiece is immersed temperature
Degree is to soak 10s in the mixed solution containing 20g/L sodium hydroxide and 5g/L sodium fluoride of 60 DEG C, then takes out
5s is cleaned with distilled water；Again solid aluminium alloy workpiece is put into by the concentrated nitric acid that concentration expressed in percentage by weight is 65% and
Concentration expressed in percentage by weight be 40% the mixed solution prepared with volume ratio for 3:1 of Fluohydric acid. in soak 10s, take out
10s is cleaned afterwards with distilled water；Then solid aluminium alloy workpiece is immersed in 30 DEG C containing 320g/L hydroxide
The mixed solution of sodium, 50g/L zinc oxide, 10g/L sodium potassium tartrate tetrahydrate and 1g/L ferric chloride soaks 45s,
Further take out and clean 10s with distilled water；Solid aluminium alloy workpiece after finally cleaning puts into containing of preparing in advance
Have in the mixed solution of 200g/L potassium chloride, 60g/L zinc chloride and 20g/L boric acid, with current intensity be
5A/dm2, 30 DEG C electroplate 10min.
Can by being respectively placed in same two ends through the solid aluminium alloy workpiece of above-mentioned surface preparation and magnesium alloy
Seal external diameter 55mm, internal diameter 50mm, long 570mm quartzy tube chamber (A) in both sides, wherein solid aluminium alloy
Workpiece (B) is placed in a moveable pallet (C) of quartz tube chamber (A) interior side, and magnesium alloy (D) is placed in quartz
One internal diameter 8mm of tube chamber (A) interior opposite side, long 290mm little quartz ampoule (E) in, by device two ends seal,
First employing mechanical pump is to quartz tube chamber (A) evacuation 15min, then uses molecular pump to be evacuated to 5 × 10-3Pa, it
After be re-filled with noble gas Ar (percentage by volume 99.99%) to 0.12Mpa.Controlled by computer program again
Being placed in quartz tube chamber (A) outer resistance furnace (G) heated quartz tube chamber (A) to after 700 DEG C, mobile pallet (C) will be solid
Body Al alloy parts (B) moves to quartz tube chamber (A) central authorities and is positioned at the underface of little quartz ampoule (E) loophole and is preheating to set
After fixed temperature 550 DEG C, then by the graphite " piston " (F) in little quartz ampoule (E) by the liquid magnesium alloy (D) of fusing
Squeezing drops on solid aluminium alloy workpiece (B), it is achieved Mg/Al bimetallic liquid-solid composite, with will the double gold of this Mg/Al
Genus plied timber moves to the air cooling zone of quartz ampoule intracavity side and is cooled to less than 100 DEG C, it is thus achieved that interface cohesion is good
Mg/Al bimetallic plied timber.
The Mg/Al bimetallic plied timber of above-mentioned formation being again heated to 430 DEG C, is incubated 2h, insulation completes
After, take out Mg/Al bimetallic plied timber air cooling to room temperature, the i.e. Mg/Al of acquisition Interface Microstructure performance optimization
Bimetallic plied timber.
Fig. 4 is that SIRION200 scanning electron microscope (SEM) observes lower AZ31/AlSi17 liquid-solid composite interface
Microstructure picture, as can be seen from the figure defining a continuous print near the interface of solid aluminum side
Black bar Mg2Si phase, and define a small amount of dendritic crystalline fragility chemical combination in the boundary zone near magnesium alloy side
Thing.
Fig. 5 is through 430 DEG C, is incubated the micro-of the AZ31/AlSi17 liquid-solid composite interface after 2h Isothermal treatment
Macrograph, it can be seen that aobvious with the most thermally treated AZ31/AlSi17 bimetallic plied timber
Micro-assembly robot figure (Fig. 4) is compared, continuous print Mg in interface2Si phase in version is tiny, subsphaeroidal and Dispersed precipitate
Mg2Si granule.The Mg of these Dispersed precipitate2Si granule serves the effect of interface enhancing, to the knot improving interface
It is favourable for closing intensity.The shear strength of the Mg/Al bimetallic plied timber finally obtained is 74.5MPa.As
In the range of 550-580 DEG C, change the preheating temperature of solid aluminium alloy workpiece, in 2-3h, change the guarantor of heat treatment
The temperature time, the effect identical with above-mentioned experimental result can be obtained.
Claims (1)
1. the method suppressing Mg/Al bimetallic liquid-solid compound interface frangible compounds, its feature exists
As follows in concrete operation step:
The first step, elder generation add cheap elements Si in aluminium alloy: after being completely melt by commercial aluminum alloy, add weight
The industrial crystallization silicon of amount percentage ratio 7.5%, after all dissolving, is stirred, so that its homogenization, then dragging for
Remove the residue on aluminium alloy surface, be poured into immediately in metal mold or sand mold and carry out gravitational casting formation solid aluminium alloy
Workpiece；
Second step, the solid aluminium alloy workpiece of above-mentioned formation use zincate process and electroplating technology carry out surface
Pretreatment: first solid aluminium alloy surface is polishing to surface smoothness >=6 grade, then uses concentration of volume percent
For the alcohol washes of 55%-60%, then clean with distilled water；Again solid aluminium alloy workpiece is soaked in acetone
Carry out ultrasonic waves for cleaning；Again solid aluminium alloy workpiece is put into 60-80 DEG C containing 20g/L sodium hydroxide and 5g/L
The mixed solution of sodium fluoride soaks 5-10s, then takes out in immersion distilled water and clean；Again by solid aluminium alloy
Workpiece is put into by the concentrated nitric acid that concentration expressed in percentage by weight is 65% and Fluohydric acid. that concentration expressed in percentage by weight is 40% with body
Long-pending ratio soaks 5-10s in the mixed solution for 3:1 preparation, clean with distilled water after taking-up；Then by solid aluminium
Alloy workpiece be immersed in 25-30 DEG C containing 320g/L sodium hydroxide, 50g/L zinc oxide, 10g/L tartaric acid
The mixed solution of potassium sodium and 1g/L ferric chloride soaks 30-45s, further takes out and clean with distilled water；Finally will
Solid aluminium alloy workpiece after cleaning put into prepare in advance containing 200g/L potassium chloride, 60g/L zinc chloride and
In the mixed solution of 20g/L boric acid, with current intensity as 0.5-5A/dm2, 20-30 DEG C electroplate 10-15min；
3rd step, it is 3-7 in mass ratio by solid aluminium alloy workpiece and the magnesium alloy through above-mentioned surface preparation:
1 is respectively placed in same two ends sealable external diameter 55mm, internal diameter 50mm, the quartzy tube chamber of long 570mm
(A) both sides in, wherein solid aluminium alloy workpiece (B) is placed on quartz one of tube chamber (A) interior side and may move
Pallet (C) in, magnesium alloy (D) be placed in quartz tube chamber (A) interior opposite side an internal diameter 6-8mm, long 290mm
Little quartz ampoule (E) in, by device two ends seal, first use mechanical pump to quartz tube chamber (A) evacuation be no less than
15min, then use molecular pump to be evacuated to be not less than 5 × 10-3Pa, is re-filled with noble gas Ar extremely afterwards
0-0.12Mpa；
4th step, control are placed in quartz tube chamber (A) resistance furnace (G) heated quartz tube chamber (A) outward to 650 DEG C
～after 700 DEG C, solid aluminium alloy workpiece (B) is moved to quartz tube chamber (A) central authorities and is positioned at little quartz ampoule by mobile pallet (C)
(E) after the underface of loophole is preheating to design temperature 550 DEG C-580 DEG C, then by the graphite in little quartz ampoule (E)
The liquid magnesium alloy (D) of fusing is squeezed and drops on solid aluminium alloy workpiece (B) by " piston " (F), it is achieved the double gold of Mg/Al
Belong to liquid-solid composite, with will this Mg/Al bimetallic plied timber air cooling zone of moving to quartz ampoule intracavity side cold
But to less than 100 DEG C, it is thus achieved that the Mg/Al bimetallic plied timber that interface cohesion is good；
5th step, the Mg/Al bimetallic plied timber of above-mentioned formation is again heated to 410 DEG C-430 DEG C, protects
Temperature 2-3h, then takes out Mg/Al bimetallic plied timber air cooling to room temperature, i.e. obtains Interface Microstructure performance excellent
The Mg/Al bimetallic plied timber changed.
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| CN106270461A (en) * | 2015-06-04 | 2017-01-04 | 东营市泰达石油装备有限责任公司 | A kind of synthesis technique of wearing composite material |
| CN105817607A (en) * | 2016-05-30 | 2016-08-03 | 合肥工业大学 | Method for raising combination intensity of liquid and solid compound interface of aluminum/copper double metal |
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