CN106676332A - Aluminum alloy composite refining-modifying agent and preparing method and application thereof - Google Patents

Aluminum alloy composite refining-modifying agent and preparing method and application thereof Download PDF

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Publication number
CN106676332A
CN106676332A CN201610931746.3A CN201610931746A CN106676332A CN 106676332 A CN106676332 A CN 106676332A CN 201610931746 A CN201610931746 A CN 201610931746A CN 106676332 A CN106676332 A CN 106676332A
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alterant
alloys
alloy
composite
passed
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丁俭
苗赛男
夏兴川
姜珊
赵维民
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Hebei University of Technology
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Hebei University of Technology
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/06Making alloys with the use of special agents for refining or deoxidising
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium

Abstract

The invention relates to an Al-Sr-La composite refining-modifying agent. The refining-modifying agent comprises, by mass percent, 1%-9% of Sr, 2%-12% of La and the balance Al. A refining agent of the Al-Sr-La composite refining-modifying agent is composed of Al-Sr-La, an Al-Sr intermediate alloy and an Al-La intermediate alloy serve as raw materials, and the preparing cost of the composite refining-modifying agent is greatly reduced. Meanwhile, the characteristics that the Al-Sr has a modifying function on an A356.2 aluminum alloy and the Al-La has a refining function are utilized in a modifying agent, and A356.2 aluminum alloys different in modifying and refining matched degree can be obtained by controlling the mass ratio of the two intermediate alloys in the composite refining-modifying agent.

Description

A kind of aluminium alloy compound refinement-alterant and its preparation method and application
Technical field:
The invention belongs to the design of cast aluminium alloy gold composition and manufacture field, specially a kind of preparation side of A356.2 aluminium alloys Method and its composite refining-alterant for using.
Background technology:
Recently as increasingly increasing for China haze pollution, people to the serious hope of clean air and blue sky and white cloud also increasingly Deepen.The quick increase of automobile pollution and exhaust emissions amount is considered as a main cause for causing haze to pollute.Research Show that the deadweight for reducing automobile can reduce its energy resource consumption and can be effectively reduced its exhaust emissions amount again.Therefore, how Realizing the lightweight of automobile becomes the emphasis of scientific research personnel's research.At present the approach of automobile lightweight mainly has two: One is the design and optimization of automobile entirety and component structural, and two is to adopt lightweight structural material.Wherein structure design and optimization Premised on must be to ensure overall construction intensity, this requires more succinct structure design, and needs corresponding lightweight knot Premised on structure material.In existing lightweight structural material, A356.2 aluminium alloys are widely used with its excellent combination property On automotive hub, the weight of wheel hub is considerably reduced.Because the Eutectic Silicon in Al-Si Cast Alloys in as cast condition A356.2 aluminium alloy is presented tip-angled shape, The mechanical property of alloy can greatly be deteriorated.Therefore, in order to improve its mechanical property, existing production technology Al-Ti- is adopted more B and Al-Sr intermediate alloys are refined to it and gone bad respectively, and using effect is preferable.Through years of researches and application, Al- Ti-B and Al-Sr is larger to the further raising difficulty of A356.2 Mechanical Properties of Aluminum Alloys, and due to there is B with Sr elements " poisoning " phenomenon, has directly influenced the further optimization that aluminum alloy junction component is particularly in aluminium alloy wheel hub performance, also limits The further raising of aluminium alloy wheel hub effects of energy saving and emission reduction.
For case above, scientific research personnel constantly carries out the exploitation of New Refiners and alterant, in the hope of further raising The mechanical property of A356.2 aluminium alloys.CN104894405A discloses a kind of using Al-La amorphous alloys refinement A356 aluminum The method of thick tissue in alloy, the method can effectively refine a-Al, but poor to the modification effect of Eutectic Silicon in Al-Si Cast Alloys in alloy, and Al-La non-crystaline amorphous metals are first prepared, complex process is relatively costly, is unfavorable for industrialization promotion and application;CN103589916A is public Opened a kind of fining agent suitable in A356.2 aluminium alloys and preparation method thereof, the fining agent can effective refining alloy, but its In cause its relatively costly comprising Sc elements;CN103173663A discloses a kind of suitable for the compound thin of A356.2 aluminium alloys Change-alterant, the composite refining-alterant can once realize the refinement to alloy and go bad, but wherein there is also B and Sr " poisoning " phenomenon of element, limits its further raising to alloy mechanical property.As fully visible, still lacking at present can be big Amplitude improves A356.2 Mechanical Properties of Aluminum Alloys and process is simple composite refining-alterant with low cost.
The present invention develops a kind of new composite refining-change suitable for A356.2 aluminium alloys to solve problem above Matter agent, good and stable rotten and refining effect can be produced to alloy and its mechanical property can be increased substantially simultaneously.
The content of the invention
The purpose of the present invention is the deficiency for current A356.2 aluminium alloy capabilities, there is provided a kind of aluminium alloy compound refinement- Alterant.The fining agent consists of Al-Sr-La, is, with Al-Sr, Al-La intermediate alloy as raw material, greatly reduce compound The preparation cost of refinement-alterant.Meanwhile, the alterant has metamorphism, Al-La using Al-Sr to A356.2 aluminium alloys With refining effect, two kinds of intermediate alloy mass ratioes in control composite refining-alterant can be passed through, so as to obtain it is rotten with The different A356.2 aluminium alloys of refinement degree of cooperation.
The technical scheme is that:
A kind of Al-Sr-La composite refinings-alterant, the quality percentage composition of the refinement-alterant is Sr 1~9%, La 2~12%, remaining is Al.
The preparation method of described Al-Sr-La composite refinings-alterant, comprises the following steps:
First, carry out pretreatment, according to the composition and ratio of refinement-alterant, by Al-Sr, Al-La intermediate alloy ingot and After pure Al ingots cutting, polished, polish to remove the oxide skin on surface, dried after cleaning, weighed;
Secondly, melting is carried out in crucible electrical resistance furnace:Fine aluminium block is placed in graphite crucible, is placed at 730-750 DEG C Resistance furnace in;Its surface scale is removed after pure Al is completely melt, load weighted Al-Sr intermediate alloys are added afterwards;Protect After warm 20-40min, Al-La intermediate alloys are added;After intermediate alloy is completely melt, with graphite stirring rod mechanical agitation 5- 10min makes alloy mix homogeneously;Furnace temperature is down to into 710-730 DEG C, 10-15min is stood, after removing surface scum, to molten metal In be passed through high-purity argon gas 2-3min and carry out refine;After standing 3-5min, surface scum is removed, and molten metal is poured in mould, Al-Sr-La composite refinings-alterant required for obtaining;
Described Al-Sr is preferably Al-10Sr alloys;Al-La is preferably Al-20La alloys.
The application process of described Al-Sr-La composite refinings-alterant, comprises the following steps:
Pretreatment is carried out first, is cut and polished after A356.2 aluminium alloys and Al-Sr-La composite refinings-alterant, throws Light is dried again with removing the oxide skin on surface after cleaning, is weighed;
Secondly, melting is carried out in crucible electrical resistance furnace:A356.2 aluminium alloys are placed in the graphite crucible cleaned out, and Graphite crucible is placed in 730-750 DEG C of resistance furnace;After A356.2 aluminium alloys are completely melt, surface scum is removed, to metal High-purity argon gas 2-3min is passed through in liquid, and molten metal is stirred continuously with breather during argon is passed through;Stand 3- After 5min, the scum silica frost on surface is removed again, the Al-Sr-La for accounting for that A356.2 aluminium alloy qualities fraction is 0.1%-5% is added afterwards Composite refining-alterant;After insulation 3-5min, high-purity argon gas 3min is passed through in molten metal, and is being passed through the process of argon Middle breather is stirred continuously;Stand and remove after 3-5min surface scum and molten metal is poured in cast iron die, finally To modified A356.2 aluminium alloys;
It should be noted that from metal derby is begun place into whole casting process is completed, to continue to be passed through height in resistance furnace Pure argon is as protective gas preventing material oxidation scaling loss.
Compared with prior art, marked improvement of the invention is as follows:
(1) refinement-alterant in the present invention can be gone bad, be refined simultaneously to A356.2 aluminium alloys, and be passed through Refinement-alterant it is pre-prepared so as to Elemental redistribution is more uniform, can also play the maximum effect of effective element;
(2) Al-Sr-La composite refinings-alterant of the invention makes raw material with Al-Sr, Al-La intermediate alloy as raw material More simplify, preparation process is simple, be easy to operation, be conducive to industrially spread to use;
(3) can be while good rotten, refining effect be realized, it is to avoid industry at present conventional Al-Ti-B, Al-Sr " poisoning " phenomenon of refinement-alterant;
(4) difference can be obtained by the mass ratio of Al-Sr, Al-La intermediate alloy in change composite refining-alterant Sr:Al-Sr-La composite refinings-the alterant of La ratios, realizes to alloy refinement and rotten precise control, different obtaining Degree carries out different degrees of rotten to Eutectic Silicon in Al-Si Cast Alloys while refinement, and then regulate and control the intensity and elongation percentage of alloy.
Description of the drawings
Fig. 1 is respectively Al-6Sr-7La in embodiment two and adds A356.2 aluminium alloys with Al-Ti-B, Al-Sr in comparative example Afterwards, 100 times of metallographs under as cast condition, wherein, Fig. 1 a are that A356.2 is adding Al-6Sr-7La refinements-alterant in embodiment two Metallograph after process, Fig. 1 b are metallographics of the A356.2 after adding Al-Ti-B, Al-Sr refinement-alterant to process in comparative example Figure;
Fig. 2 is respectively Al-6Sr-7La in embodiment two and adds A356.2 aluminium alloys with Al-Ti-B, Al-Sr in comparative example Afterwards, 500 times of metallographs under as cast condition, wherein, Fig. 2 a are that A356.2 is adding Al-6Sr-7La refinements-alterant in embodiment two Metallograph after process, Fig. 1 b are metallographics of the A356.2 after adding Al-Ti-B, Al-Sr refinement-alterant to process in comparative example Figure.
Specific embodiment
Embodiment one
1st, smelting technology:
1) according to the mass percent of each component element in subject alloy:Sr 1%, La 12%, remaining is matched somebody with somebody for Al Than and get the raw materials ready;Cut and polished after Al-10Sr, Al-20La intermediate alloy ingot and fine aluminium ingot, polish to remove the oxygen on surface Change skin, then cleaned in ultrasonic wave concussion device with acetone, dried afterwards, weighed;
2) resistance furnace is warming up to into 740 DEG C, after temperature stabilization, fine aluminium block is placed in the graphite crucible cleaned out In, in being placed in resistance furnace.Its surface scum is removed after pure Al blocks are completely melt, the load weighted Al- of step 1 is added afterwards 10Sr intermediate alloys;
3) it is incubated after 20min, adds the load weighted Al-20La intermediate alloys of step 1;
4) after intermediate alloy is completely melt, with graphite stirring rod mechanical agitation 5min alloy mix homogeneously is made;
5) furnace temperature is down to into 720 DEG C, stands 10min, after removing surface scum, high-purity argon gas 3min is passed through in molten metal Carry out refine;
6) stand after 3min, remove surface scum, and molten metal is poured in cast iron die, obtain Al-1Sr-12La and answer Close refinement-alterant.
It should be noted that from Al-Sr intermediate alloys are initially added into whole casting process is completed, to continue toward resistance furnace In be passed through high-purity argon gas as protective gas to prevent material oxidation scaling loss.
2nd, refinement-modification process:
1) cut and polished after A356.2 aluminium alloys and Al-Sr-La composite refinings-alterant, polish to remove surface Oxide skin, cleaned in ultrasonic wave concussion device with acetone, dried again afterwards, weigh.Weighing mass fraction is 0.5% Al-Sr-La alloy blocks, remaining is A356.2 aluminium alloys;
2) resistance furnace is warming up to into 730 DEG C, A356.2 aluminium alloys is placed in the graphite earthenware cleaned out after temperature stabilization In crucible, and graphite crucible is placed in resistance furnace;
3) after A356.2 aluminium alloys are completely melt, surface scum is removed, high-purity argon gas 3min is passed through in molten metal, and And it is stirred continuously molten metal with breather during argon is passed through;
4) scum silica frost for removing surface after 5min again is stood, load weighted Al-Sr-La composite refinings-rotten is added afterwards Agent;
5) it is incubated after 3min, high-purity argon gas 3min is passed through in molten metal, and with ventilation during argon is passed through Pipe is stirred continuously;
6) stand and remove after 3min surface scum and molten metal is poured in cast iron die;
7) metal derby of one piece of 1cmx1cmx1cm is cut after ingot casting cooling, after producing metallographic specimen, is with volume fraction 0.05% HF corrosion.
Embodiment two
1st, smelting technology:
1) according to the mass percent of each component element in subject alloy:Sr 6%, La 7%, remaining carries out proportioning for Al And get the raw materials ready;Cut and polished after Al-10Sr, Al-20La intermediate alloy ingot and fine aluminium ingot, polish to remove the oxidation on surface Skin, is then cleaned with acetone in ultrasonic wave concussion device, is dried again afterwards, is weighed;
2) with embodiment one;
3) with embodiment one;
4) with embodiment one;
5) with embodiment one;
6) with embodiment one;
This embodiment finally obtains Al-6Sr-7La composite refinings-alterant, it should be noted that from being initially added into fine aluminium Block to whole casting process is completed will continue that high-purity argon gas are passed through toward resistance furnace as protective gas to prevent material oxidation from burning Damage.
2nd, refinement-modification process:With embodiment one.
Fig. 1 a and Fig. 2 a are respectively and are added Al-6Sr-7La refinement-alterants obtained in the present embodiment with 0.5% content Enter to after A356.2 aluminium alloys, 100 times of as cast condition A356.2 aluminium alloy with 500 times of metallographic structure photos.By Fig. 1 a and Fig. 1 b Contrast as can be seen that the Al-Ti-B, Al-Sr refinement-metamorphic phase ratio the most frequently used with current factory, is carried out with Al-6Sr-7La The A356.2 aluminium alloy secondary dendrite arm spacings of fine degenerate are less, i.e. the thinning effect of α-Al is better;By Fig. 2 a and figure The contrast of 2b is as can be seen that compared with the most frequently used Al-Ti-B, Al-Sr refinement-alterant of current factory, use Al-6Sr-7La The fibrelike eutectic silicon size for carrying out the A356.2 aluminium alloys of fine degenerate is shorter, and the trend toward ball-type transition becomes apparent from.
Embodiment three
1st, smelting technology:
1) according to the mass percent of each component element in subject alloy:Sr 9%, La 2%, remaining carries out proportioning for Al And get the raw materials ready;Cut and polished after Al-10Sr, Al-20La intermediate alloy ingot, polish to remove the oxide skin on surface, Ran Houyong Acetone is cleaned in ultrasonic wave concussion device, is dried again afterwards, is weighed;
2) resistance furnace is warming up to into 740 DEG C, after temperature stabilization, the load weighted Al-10Sr intermediate alloys of step 1 is placed in In the graphite crucible cleaned out, in being placed in resistance furnace;
3) with embodiment one;
4) with embodiment one;
5) with embodiment one;
6) with embodiment one;
This embodiment finally obtains Al-9Sr-2La composite refinings-alterant, it should be noted that from being initially added into fine aluminium Block to whole casting process is completed will continue that high-purity argon gas are passed through toward resistance furnace as protective gas to prevent material oxidation from burning Damage.
2nd, refinement-modification process:With embodiment one.
Comparative example
1) cut and polished after A356.2 aluminium alloys and Al-Ti-B, Al-Sr intermediate alloy, polish to remove surface Oxide skin, is then cleaned with acetone in ultrasonic wave concussion device, is dried again afterwards, is weighed.Weigh mass fraction to be respectively 0.2% Al-Ti-B, Al-Sr alloy block, remaining is A356.2 aluminium alloys;
2) resistance furnace is warming up to into 730 DEG C, the load weighted A356.2 aluminium alloys of step 1 is placed in into cleaning after temperature stabilization In clean graphite crucible, and graphite crucible is placed in resistance furnace;
3) after A356.2 aluminium alloys are completely melt, surface scum is removed, high-purity argon gas 3min is passed through in molten metal, and And it is stirred continuously molten metal with breather during argon is passed through;
4) scum silica frost for removing surface after 5min again is stood, is added closed in the middle of load weighted Al-Ti-B, Al-10Sr afterwards Gold;
5) it is incubated after 3min, high-purity argon gas 3min is passed through in molten metal, and with ventilation during argon is passed through Pipe is stirred continuously;
6) stand and remove after 3min surface scum and molten metal is poured in cast iron die.
Fig. 1 b and Fig. 2 b are respectively and are added Al-Ti-B, Al-Sr intermediate alloy in this comparative example with 0.2% content respectively Enter to after A356.2 aluminium alloys, 100 times of as cast condition A356.2 aluminium alloy with 500 times of metallographic structure photos.As can be seen from the figure Secondary dendrite arm spacing is less, i.e. the thinning effect of α-Al is preferable;Eutectic Silicon in Al-Si Cast Alloys in A356.2 aluminium alloys is also by traditional tip-angled shape It is longer bacillar structure to go bad.
Table 1 represents the rotten A356.2 aluminium alloys with Al-6Sr-7La fine degenerates of Al-Ti-B, Al-Sr composite refining Secondary dendrite arm spacing value.
Table 1
Table 1 intuitively shows the rotten casting with Al-6Sr-7La fine degenerates of Jing Al-Ti-B, Al-Sr composite refining respectively The secondary dendrite arm spacing value of state A356.2 aluminium alloy, can be seen that and current industry from the change of secondary dendrite arm spacing value in table 1 In Al-Ti-B, Al-Sr composite refining metamorphic phase ratio for commonly using, the thinning effect of Al-6Sr-7La is slightly excellent.In view of Al-Ti-B, " poisoning " phenomenon of B and Sr elements during Al-Sr composite refinings are rotten, therefore the development prospect of Al-Sr-La refinement-alterants is more It is good.
Can be seen that from embodiment one to embodiment three by the contrast between each embodiment result, Sr is in Al-Sr-La Shared ratio gradually increases in refinement-alterant, i.e. Sr and La ratios so far gradually increase.Through fine degenerate The secondary dendrite arm spacing of A356.2 aluminium alloys increases successively, and the form of Eutectic Silicon in Al-Si Cast Alloys is gradually transitioned into elongated fiber by tip-angled shape Shape, ultimately forms tiny graininess.I.e. thinning effect gradually weakens, and modification effect gradually strengthens.Namely A356.2 aluminium alloys Intensity reduce successively, toughness increases successively.In other words, Sr is improved:The ratio of La can carry heavy alloyed modification effect;Reduce Sr:The ratio of La can carry heavy alloyed thinning effect, can pass through quantitative adjusting Sr:The ratio of La can realize the change to alloy The quantitative control of matter and thinning effect, so as to realize the regulation and control of the mechanical property to alloy.In actual application, can basis Local environment determines the height of material requested strength and toughness, so as to select properly mixed Al-Sr-La refinements-alterant.
By above-mentioned Binding experiment accompanying drawing, invention has been described, but it is only that part is real to be embodied as case above Test, be not the practical range for limiting the present invention.The person skilled of this area is according to the present invention or without departing from this In the case of invention objective, the equivalent deformation for being carried out and relevant modifications, all within protection scope of the present invention.
Unaccomplished matter of the present invention is known technology.

Claims (4)

1. a kind of Al-Sr-La composite refinings-alterant, it is characterized by the quality percentage composition of the refinement-alterant be Sr 1~ 9%, La 2~12%, remaining is Al.
2. the preparation method of Al-Sr-La composite refinings-alterant as claimed in claim 1, it is characterized by including following step Suddenly:
First, pretreatment is carried out, according to the composition and ratio of refinement-alterant, by Al-Sr, Al-La intermediate alloy ingot and pure Al After ingot cutting, polished, polish to remove the oxide skin on surface, dried after cleaning, weighed;
Secondly, melting is carried out in crucible electrical resistance furnace:Fine aluminium block is placed in graphite crucible, is placed at 730-750 DEG C Resistance furnace in;Its surface scale is removed after pure Al is completely melt, load weighted Al-Sr intermediate alloys are added afterwards;Protect After warm 20-40min, Al-La intermediate alloys are added;After intermediate alloy is completely melt, with graphite stirring rod mechanical agitation 5- 10min makes alloy mix homogeneously;Furnace temperature is down to into 710-730 DEG C, 10-15min is stood, after removing surface scum, to molten metal In be passed through high-purity argon gas 2-3min and carry out refine;After standing 3-5min, surface scum is removed, and molten metal is poured in mould, Al-Sr-La composite refinings-alterant required for obtaining.
3. the preparation method of Al-Sr-La composite refinings-alterant as claimed in claim 1, it is characterized by described Al-Sr Preferably Al-10Sr alloys;Al-La is preferably Al-20La alloys.
4. the application process of Al-Sr-La composite refinings-alterant as claimed in claim 1, it is characterized by including following step Suddenly:
Carry out pretreatment first, cut polished after A356.2 aluminium alloys and Al-Sr-La composite refinings-alterant, polish with The oxide skin on surface is removed, is dried again after cleaning, weighed;
Secondly, melting is carried out in crucible electrical resistance furnace:A356.2 aluminium alloys are placed in the graphite crucible cleaned out, and Graphite crucible is placed in 730-750 DEG C of resistance furnace;After A356.2 aluminium alloys are completely melt, surface scum is removed, to metal High-purity argon gas 2-3min is passed through in liquid, and molten metal is stirred continuously with breather during argon is passed through;Stand 3- After 5min, the scum silica frost on surface is removed again, the Al-Sr-La for accounting for that A356.2 aluminium alloy qualities fraction is 0.1%-5% is added afterwards Composite refining-alterant;After insulation 3-5min, high-purity argon gas 3min is passed through in molten metal, and is being passed through the process of argon Middle breather is stirred continuously;Stand and remove after 3-5min surface scum and molten metal is poured in cast iron die, finally To modified A356.2 aluminium alloys.
CN201610931746.3A 2016-10-25 2016-10-25 Aluminum alloy composite refining-modifying agent and preparing method and application thereof Pending CN106676332A (en)

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CN106014594A (en) * 2016-06-17 2016-10-12 安徽天祥空调科技有限公司 Integrally formed water chamber for automobile radiator

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