CN110616355A - Preparation method of high-silicon aluminum alloy rheological slurry - Google Patents
Preparation method of high-silicon aluminum alloy rheological slurry Download PDFInfo
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Abstract
The invention belongs to the field of semi-solid metal forming, and particularly relates to a preparation method of high-silicon aluminum alloy rheological slurry. The invention aims to solve the technical problem of providing a preparation method of high-silicon aluminum alloy rheological slurry with good refining effect on primary silicon and eutectic silicon. The method comprises a, smearing the aluminum alloy casting paint on the inner wall of a mechanical roller, drying and preheating; b. setting the inclination angle of the mechanical roller relative to the horizontal line of the ground to be 10-60 degrees, and setting the stirring speed to be 10-500 r/min; c. and keeping the melt temperature of the high-silicon aluminum alloy treated by the rare earth element at 30-50 ℃ above the liquidus temperature of the high-silicon aluminum alloy according to different Si contents, quickly pouring into a mechanical roller, and stirring to obtain the high-silicon aluminum alloy rheological slurry. The invention has the function of inhibiting growth in the precipitation process of primary silicon and eutectic silicon, and can further realize the crushing and refining functions of the primary silicon and the eutectic silicon.
Description
Technical Field
The invention belongs to the field of semi-solid metal forming, and particularly relates to a preparation method of high-silicon aluminum alloy rheological slurry.
Background
The piston is one of the most critical moving parts of the engine and is related to various indexes of the engine, such as service life, efficiency, weight and the like. The working environment of the piston is extremely harsh and is subjected to high mechanical and thermal loads. In order to ensure good operation of the engine, extremely high requirements are put on the materials used for the piston: high-temperature strength, low thermal expansion, good wear resistance, corrosion resistance, good thermal conductivity and the like. With the rising of crude oil price, the requirement of social environmental protection and the rapid development of manufacturing technology, under the requirements of energy conservation, weight reduction and environmental protection, materials used in the industrial fields of transportation, aerospace and the like are developed to be light in weight, so as to achieve the purposes of high strength, high efficiency and energy conservation. The high-silicon aluminum alloy has the advantages of small specific gravity, high hardness, good wear resistance, good casting formability, high dimensional stability and the like, has great potential of replacing the traditional steel material to become an engine piston under the requirements of low energy consumption and light weight of material use, and is expected to be widely applied to industries of aerospace, automobiles, ships and the like.
The content of Si element in the high-silicon aluminum alloy is usually 18-30 wt%, and the mechanical property of the high-silicon aluminum alloy is closely related to the content and the shape of the high-silicon aluminum alloy in the alloy. As the content of Si element in the aluminum alloy increases, coarse primary silicon in the shape of five-lobed stars, plates, octahedrons, and other complex morphologies is generally formed in the microstructure of the alloy. These complex shaped, coarse primary silicon severely spall the alloy matrix. Under the action of external force, local stress concentration is easily generated at the tip and the edge part of a coarse primary silicon phase, the plasticity and the wear resistance of the alloy are obviously influenced, and the mechanical property of the alloy is seriously reduced. In addition to forming coarse primary silicon, the Si element also forms needle-shaped and strip-shaped eutectic silicon at the later stage of alloy solidification, and the size and the shape of the eutectic silicon seriously influence the plasticity of the alloy. In addition, during the machining process of various parts made of high-silicon aluminum alloy, hard and brittle coarse primary silicon is easy to peel off under stress, and the wear of a machining tool is accelerated while the smoothness of the surface of a machined part is reduced. The application range of the high-silicon aluminum alloy is limited by the coarse silicon phase in the high-silicon aluminum alloy, so the refining process of the high-silicon aluminum alloy has great significance for the application of the series of alloys.
At present, the industry mainly adopts a chemical refining method to carry out modification and refinement treatment on a silicon phase of a eutectic aluminum-silicon alloy, and the main idea is to realize the refinement purpose by adding chemical elements such as rare earth and the like into the alloy. Patent document CN102417998A discloses a hypereutectic silicon refining process, which has a certain refining effect on primary silicon of hypereutectic aluminum-silicon alloy with low silicon content, but has no obvious effect on high silicon content alloy, and only acts on the primary silicon, and has no obvious effect on the deterioration and refining of eutectic silicon.
Such chemical refining methods generally have the defects of short action time, unstable refining effect, serious pollution and the like, and cannot realize the refining requirement on the silicon phase in the high-silicon aluminum alloy. The mechanical stirring method derived from the semi-solid forming technique, which is one of the most effective methods of the semi-solid technique for achieving the purpose of dendrite breaking and grain refinement by applying a mechanical shearing force to a melt during solidification, is one of the most effective methods of the semi-solid forming technique (e.g., chinese patent No. CN 2471450Y; japanese patent No. 1-192447; U.S. patent No. 3958650, 5501266 and 5040589). These methods generally require closed processing in a crucible of a certain capacity, with a limited quality of alloy for a single treatment; in addition, the slurry is in an isothermal heat preservation state in the treatment process, and the driving force for grain growth is large, so that the refining is not facilitated. Furthermore, the above patent methods were designed primarily around primary silicon refinement, and the actual effect was not effective for eutectic silicon.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of high-silicon aluminum alloy rheological slurry with good refining effect on primary silicon and eutectic silicon.
The invention provides a preparation method of high-silicon aluminum alloy rheological slurry, which comprises the following steps:
a. coating the aluminum alloy casting coating on the inner wall of a mechanical roller, drying and preheating;
b. setting the inclination angle of the mechanical roller relative to the horizontal line of the ground to be 10-60 degrees, and setting the stirring speed to be 10-500 r/min;
c. and keeping the temperature of the high-silicon aluminum alloy melt treated by the rare earth element at 30-50 ℃ above the liquidus temperature of the high-silicon aluminum alloy according to different Si contents, quickly pouring the high-silicon aluminum alloy melt into a mechanical roller, and stirring to obtain the high-silicon aluminum alloy rheological slurry.
In the preparation method of the high-silicon aluminum alloy rheological slurry, in the step a, the preheating temperature is 100-300 ℃.
In the preparation method of the rheological slurry of the high-silicon aluminum alloy, in the step c, the high-silicon aluminum alloy melt processed by the rare earth element is prepared by the following steps:
(1) melting the high-silicon aluminum alloy master batch;
(2) stirring the high-silicon aluminum alloy at a temperature which is 50-70 ℃ higher than the liquidus temperature according to different Si contents, and standing for the first time;
(3) setting the temperature of the high-silicon aluminum alloy melt after the first standing in the step (2) to be 30-50 ℃ higher than the liquidus temperature, adding rare earth elements, stirring, and standing for the second time;
(4) and (4) controlling the temperature of the high-silicon aluminum alloy melt after the second standing in the step (3) to be 20-30 ℃ higher than the liquidus temperature, refining, preserving heat, stirring, slagging off, and standing for the third time to obtain the high-silicon aluminum alloy.
Further, in the step (1), the melting is carried out by preheating the high-silicon aluminum alloy for 1.5-2.5 hours to 150-200 ℃ and then melting by using an industrial electric furnace.
Further, in the step (3), the rare earth elements are preheated for 1-2 hours to reach 100-200 ℃ and then added into the high-silicon aluminum alloy melt.
Wherein in the preparation method of the high-silicon aluminum alloy rheological slurry, in the step c,
in the step (2), the first standing time is 10-20 minutes.
In the step (3), the mass of the added rare earth elements accounts for 0.1-5 wt% of the mass of the high-silicon aluminum alloy melt.
In the step (3), the rare earth element is at least one of lanthanum or cerium.
In the step (3), the time for the second standing is 10-20 minutes.
In the step (4), the heat preservation time is 5-15 minutes.
In the step (4), the third standing time is 15-25 minutes.
Further, the Si content of the high-silicon aluminum alloy is 18-30 wt%, and the corresponding liquidus temperature is 680-820 ℃.
Wherein, the rare earth lanthanum and cerium are added in a simple substance form or a mixed rare earth form, and the total amount of the rare earth elements is only required to be 0.1-5 wt% of the weight percentage of the alloy melt.
In the preparation method of the high-silicon aluminum alloy rheological slurry, in the step c, the high-silicon aluminum alloy rheological slurry flowing out of the mechanical roller after stirring is stored in a holding furnace, and the furnace temperature is kept at the superheat degree of 5-15 ℃ on the liquid phase line.
Further, the rheological slurry enters a subsequent forming process within 5-10 seconds immediately after entering a heat preservation furnace.
Further, the subsequent forming process comprises the steps of casting to prepare an ingot, and then extruding, forging or rolling to form, or directly casting to form.
The invention has the beneficial effects that:
according to the method, a composite process of mechanical roller stirring and rare earth modification is adopted, and the rare earth elements are added into the high-silicon aluminum alloy, so that the high-silicon aluminum alloy plays a role in inhibiting growth in the precipitation process of primary silicon and eutectic silicon; meanwhile, the crushing and refining of primary silicon and eutectic silicon are further realized by combining the chilling and shearing actions of the mechanical roller. In addition, the shearing action can also realize the dendritic crystal breaking of the aluminum matrix, and further refine the alloy structure. The method for preparing the high-silicon aluminum alloy rheological slurry has high efficiency and short flow, and is suitable for industrial production. The rheological slurry prepared by the method can be used for preparing thixotropic billets, and can also be used for preparing castings with excellent mechanical properties and good surface quality by adopting forming technologies such as differential pressure, extrusion, high-pressure casting and the like. The method is an excellent choice for the industrial batch production of the high-silicon aluminum alloy, and has wide application prospect.
Drawings
FIG. 1 is a microstructure diagram of an untreated direct water quenching Al-18Si alloy.
FIG. 2 is a microstructure diagram of the Al-18Si alloy rheological slurry prepared by the method of the present invention after water quenching.
FIG. 3 is a microstructure diagram of the Al-30Si alloy which is directly quenched with water without treatment.
FIG. 4 is a microstructure diagram of the Al-30Si alloy rheological slurry prepared by the method of the present invention after water quenching.
FIG. 5 is a scanning electron microscope image of deep corrosion of a sample obtained by water quenching the Al-30Si alloy without treatment.
FIG. 6 is a scanning electron microscope image of deep corrosion of a sample obtained after water quenching of Al-30Si alloy rheological slurry prepared by the method of the present invention.
Detailed Description
Aiming at the problems of insufficient refining effect on a silicon phase of a high-silicon aluminum alloy, large primary silicon, large eutectic silicon and the like in the prior art, the inventor conducts rare earth modification in the aluminum-silicon alloy, and then cools a molten metal to be near a liquidus line to conduct mechanical rheological treatment. Firstly, the effect of refining primary silicon is achieved by chilling the melt through the inner wall with the large width of the mechanical roller, and secondly, the concentration difference of a temperature field in the solidification process of the melt tends to be uniform through mechanical shearing force, so that the rare earth elements can better play a role of refining eutectic silicon in the binary eutectic reaction process. Thirdly, the mechanical shearing force generates shearing and stirring effects on the aluminum matrix, so that the growth of dendrites of the aluminum matrix can be inhibited and broken, and the refinement of the high-silicon aluminum alloy is further realized. The method has the advantages of low processing cost, high efficiency, easy implementation, good refining effect of the primary silicon and the eutectic silicon, and is a feasible method for refining the silicon phase of the high-silicon aluminum alloy.
Specifically, the preparation of the high-silicon aluminum alloy rheological slurry comprises the conventional smelting and the subsequent rheological treatment process.
The smelting process comprises the following steps:
preheating the high-silicon aluminum alloy master batch for 1.5-2 hours to 150-200 ℃, and melting the alloy by using a crucible resistance furnace or other industrial electric furnaces. And stirring the molten high-silicon aluminum alloy at the temperature 50-70 ℃ higher than the liquidus temperature after the high-silicon aluminum alloy is melted, and standing for 10-20 minutes for the first time. According to the invention, the temperature change of the liquidus line of the high-silicon aluminum alloy is large along with the difference of the Si content, and the liquidus line temperature corresponding to the aluminum-silicon alloy with the Si content of 18-30 wt% in the high-silicon aluminum alloy is 680-820 ℃. Preheating a rare earth element (at least one of lanthanum or cerium) for 1-2 hours to reach 100-200 ℃, setting the temperature of the high-silicon aluminum alloy melt to be 30-50 ℃ higher than the liquidus temperature, adding the rare earth element according to 0.1-5 wt% of the mass of the high-silicon aluminum alloy melt, fully stirring to enable the alloy components to be uniform, and standing for 10-20 minutes for the second time. And then, controlling the temperature of the high-silicon aluminum alloy melt to be 20-30 ℃ higher than the liquidus temperature for refining, keeping the temperature for 5-15 minutes, stirring, slagging off, and standing for 15-25 minutes for the third time to obtain the high-silicon aluminum alloy melt treated by the rare earth elements.
The subsequent rheological treatment process comprises the following steps:
preheating a mechanical roller: and (3) coating the aluminum alloy casting coating on the inner wall of the mechanical roller, drying, preheating at 100-300 ℃, and ensuring drying.
And (3) rheological refining treatment: setting the inclination angle of the mechanical roller relative to the horizontal line of the ground to be 10-60 degrees, setting the stirring speed to be 10-500 r/min, keeping the temperature of the high-silicon aluminum alloy melt processed by the rare earth element above the liquid phase line temperature of the high-silicon aluminum alloy by 30-50 ℃ according to different Si contents, rapidly conveying the high-silicon aluminum alloy melt into the mechanical roller through a quantitative pouring system, and stirring to obtain the high-silicon aluminum alloy rheological slurry.
Slurry storage and forming: and loading the high-silicon aluminum alloy rheological slurry flowing out of the roller after stirring by using a temperature-controllable heat preservation furnace, and keeping the temperature of the heat preservation furnace at 5-15 ℃ of superheat degree according to the high-silicon alloy with different Si contents. The high-silicon aluminum alloy rheological slurry can not stay in a holding furnace for too long time, and needs to be transported and conveyed within 5-10 seconds to enter subsequent forming procedures such as high-pressure, low-pressure, extrusion casting and the like. Besides casting and forming, the high-silicon aluminum alloy rheological slurry can also be directly poured into a metal ingot mold to prepare an alloy ingot, and then plastic processing procedures such as extrusion, forging, rolling and the like are carried out.
The working mechanism of the invention is as follows:
the precipitation of the silicon phase in the high-silicon aluminum alloy is mainly divided into two stages, namely, in the initial stage of solidification, primary silicon is precipitated from a melt and grows in a small plane form with an irregular shape, and in the second stage of binary and ternary eutectic reaction along with the reduction of the temperature of the melt, Si and Al or Cu are solidified together to form a eutectic structure. Rare earth elements (lanthanum and cerium) are added into the high-silicon melt, and the rare earth elements can be partially gathered at the solidification front when a primary silicon phase is separated out to block the growth of the primary silicon phase, and can limit the migration and diffusion of melt solute at the solidification front during eutectic reaction, so that the effect of refining eutectic silicon is achieved. The invention adopts mechanical roller stirring to quench and refine primary silicon on the one hand, and can also ensure that the rare earth elements are uniformly distributed and the temperature field is uniformly distributed in the alloy eutectic reaction process, thereby further enhancing the refining effect of rare earth.
The present invention will be further illustrated by the following specific examples.
The raw materials and equipment used in the examples of the present invention were known products and were obtained by purchasing commercially available products. The aluminum alloy casting coating used in the present invention is a coating of common general knowledge of those skilled in the art. The liquidus temperature corresponding to the aluminum-silicon alloy with the Si content of 18-30 wt% in the high-silicon aluminum alloy adopted by the embodiment of the invention is 680-820 ℃.
Example 1 preparation of primary silicon refining and rheological slurries of Al-18Si alloys
Preheating the Al-18Si alloy for 1.5-2 hours to 150-200 ℃, and then melting the alloy by adopting an industrial electric furnace. And stirring the molten alloy at the temperature 50-70 ℃ higher than the liquidus temperature after the alloy is melted, and standing for 10-20 minutes for the first time. Preheating rare earth lanthanum for 1-2 hours to reach 100-200 ℃, setting the temperature of the Al-18Si alloy melt to be 30-50 ℃ higher than the liquidus temperature, adding lanthanum according to 1 wt% of the mass of the Al-18Si alloy melt, fully stirring, and standing for 10-20 minutes for the second time. And then, controlling the temperature of the Al-18Si alloy melt to be 800 ℃ for refining, keeping the temperature for 5-15 minutes, stirring, slagging off, and standing for 10 minutes for the third time.
The temperature of the Al-18Si alloy melt is reduced to 750 ℃, the inclination angle of the mechanical roller relative to the horizontal line of the ground is set to be 60 ℃, and the rotating speed is 150 r/min. Coating the aluminum alloy casting coating on the inner wall of a mechanical roller, drying, preheating at 300 ℃, pouring the refined Al-18Si alloy melt into the mechanical roller at 750 ℃ for rheological treatment, and directly quenching the treated melt in water for tissue observation.
As is apparent from FIGS. 1 and 2, after the treatment by the method of the present invention, the primary silicon size of the Al-18Si alloy is significantly refined, the average particle size is refined from 25 microns to 14 microns, and the edges and corners of the crystal grains are smooth, so that the method is very suitable for subsequent die-casting formation.
EXAMPLE 22 preparation of Primary silicon Fining and rheological slurries of Al-18Si alloys
Preheating the Al-18Si alloy for 1.5-2 hours to 150-200 ℃, and then melting the alloy by adopting an industrial electric furnace. And stirring the molten alloy at the temperature 50-70 ℃ higher than the liquidus temperature after the alloy is melted, and standing for 10-20 minutes for the first time. Preheating rare earth cerium for 1-2 hours to reach 100-200 ℃, setting the temperature of the Al-18Si alloy melt to be 30-50 ℃ higher than the liquidus temperature, adding cerium according to 0.1 wt% of the mass of the Al-18Si alloy melt, fully stirring, and standing for 10-20 minutes for the second time. And then, controlling the temperature of the Al-18Si alloy melt to be 780 ℃ for refining, keeping the temperature for 5-15 minutes, stirring, slagging off, and standing for 15 minutes for the third time.
The temperature of the Al-18Si alloy melt is reduced to 770 ℃, the inclination angle of the mechanical roller relative to the horizontal line of the ground is 10 ℃, and the rotating speed is 10 r/min. Coating the aluminum alloy casting coating on the inner wall of a mechanical roller, drying, preheating at 300 ℃, pouring the refined Al-18Si alloy melt into the mechanical roller at 770 ℃ for rheological treatment, and directly die-casting the treated melt to obtain the high-silicon aluminum alloy casting.
Example 3 preparation of Al-30Si alloy Primary silicon refinement and rheological slurries
Preheating the Al-30Si alloy for 1.5-2 hours to 150-200 ℃, and then melting the alloy by adopting an industrial electric furnace. And stirring the molten alloy at the temperature 50-70 ℃ higher than the liquidus temperature after the alloy is melted, and standing for 10-20 minutes for the first time. Preheating rare earth lanthanum for 1-2 hours to reach 100-200 ℃, setting the temperature of the Al-30Si alloy melt to be 30-50 ℃ higher than the liquidus temperature, adding lanthanum according to 3 wt% of the mass of the Al-30Si alloy melt, fully stirring, and standing for 10-20 minutes for the second time. And then, controlling the temperature of the Al-30Si alloy melt to 850 ℃ for refining, keeping the temperature for 5-15 minutes, stirring, slagging off, and standing for 15 minutes for the third time.
The temperature of the Al-30Si alloy melt is adjusted to 850 ℃, the inclination angle of the mechanical roller relative to the horizontal line of the ground is set to be 45 ℃, and the rotating speed is 90 r/min. Coating the aluminum alloy casting coating on the inner wall of a mechanical roller, drying, preheating at 300 ℃, pouring the refined Al-30Si alloy melt into the mechanical roller at 850 ℃ for rheological treatment, and directly quenching the treated melt in water for tissue observation.
As is apparent from FIGS. 3 and 4, after the treatment by the method of the present invention, the primary silicon size of the Al-30Si alloy is significantly refined, the average particle size is refined from 28 microns to 15 microns, the edges and corners of the crystal grains are smooth, and the method is very suitable for subsequent die-casting forming. As seen in the pictures of the deep corrosion scanning electron microscope in FIGS. 5 and 6, the morphology of the Al-30Si alloy eutectic silicon treated by the method of the invention is changed from a thick continuous sheet shape to a fine and separated fibrous shape, and the change of the morphology can obviously improve the strength and toughness of the aluminum-silicon alloy, thereby being very beneficial to improving the service performance of subsequent formed products.
Example 4
Preheating the Al-30Si alloy for 1.5-2 hours to 150-200 ℃, and then melting the alloy by adopting an industrial electric furnace. And stirring the molten alloy at the temperature 50-70 ℃ higher than the liquidus temperature after the alloy is melted, and standing for 10-20 minutes for the first time. Preheating the rare earth lanthanum for 1-2 hours to reach 100-200 ℃, setting the temperature of the Al-30Si alloy melt to be 30-50 ℃ higher than the liquidus temperature, adding the rare earth lanthanum according to 5 wt% of the mass of the Al-30Si alloy melt, fully stirring, and standing for 10-20 minutes for the second time. And then, controlling the temperature of the Al-30Si alloy melt to 850 ℃ for refining, keeping the temperature for 5-15 minutes, stirring, slagging off, and standing for 15 minutes for the third time.
The temperature of the Al-30Si alloy melt is adjusted to 860 ℃, the inclination angle of the mechanical roller relative to the horizontal line of the ground is set to be 60 ℃, and the rotating speed is 350 r/min. Coating the aluminum alloy casting coating on the inner wall of a mechanical roller, drying, preheating at 300 ℃, pouring the refined Al-30Si alloy melt into the mechanical roller at 860 ℃ for rheological treatment, and directly die-casting the treated melt to obtain the high-silicon aluminum alloy casting.
Claims (10)
1. The preparation method of the high-silicon aluminum alloy rheological slurry is characterized by comprising the following steps of: the method comprises the following steps:
a. coating the aluminum alloy casting coating on the inner wall of a mechanical roller, drying and preheating;
b. setting the inclination angle of the mechanical roller relative to the horizontal line of the ground to be 10-60 degrees, and setting the stirring speed to be 10-500 r/min;
c. and keeping the melt temperature of the high-silicon aluminum alloy treated by the rare earth element at 30-50 ℃ above the liquidus temperature of the high-silicon aluminum alloy according to different Si contents, quickly pouring into a mechanical roller, and stirring to obtain the high-silicon aluminum alloy rheological slurry.
2. The preparation method of the high-silicon aluminum alloy rheological slurry according to claim 1, characterized by comprising the following steps: in the step c, the high-silicon aluminum alloy melt treated by the rare earth element is prepared by the following steps:
(1) melting the high-silicon aluminum alloy master batch;
(2) stirring the high-silicon aluminum alloy at a temperature which is 50-70 ℃ higher than the liquidus temperature according to different Si contents, and standing for the first time;
(3) setting the temperature of the high-silicon aluminum alloy melt after the first standing in the step (2) to be 30-50 ℃ higher than the liquidus temperature, adding rare earth elements, stirring, and standing for the second time;
(4) and (4) controlling the temperature of the high-silicon aluminum alloy melt after the second standing in the step (3) to be 20-30 ℃ higher than the liquidus temperature, refining, preserving heat, stirring, slagging off, and standing for the third time to obtain the high-silicon aluminum alloy.
3. The preparation method of the high-silicon aluminum alloy rheological slurry according to claim 1, characterized by comprising the following steps: in the step a, the preheating temperature is 100-300 ℃.
4. The preparation method of the high-silicon aluminum alloy rheological slurry according to claim 2, characterized by comprising the following steps of: in the step (1), the melting is carried out by preheating the high-silicon aluminum alloy for 1.5-2.5 hours to 150-200 ℃ and then melting by using an industrial electric furnace.
5. The preparation method of the high-silicon aluminum alloy rheological slurry according to claim 2, characterized by comprising the following steps of: in the step (3), the rare earth elements are preheated for 1-2 hours to reach 100-200 ℃ and then added into the high-silicon aluminum alloy melt.
6. The preparation method of the high-silicon aluminum alloy rheological slurry according to claim 2, characterized by comprising the following steps of: in step c, at least one of the following is satisfied:
in the step (2), the first standing time is 10-20 minutes;
in the step (3), the mass of the added rare earth element accounts for 0.1-5 wt% of the mass of the high-silicon aluminum alloy melt;
in the step (3), the rare earth element is at least one of lanthanum or cerium;
in the step (3), the time for the second standing is 10-20 minutes;
in the step (4), the heat preservation time is 5-15 minutes;
in the step (4), the third standing time is 15-25 minutes.
7. The method for preparing the rheological slurry of the high-silicon aluminum alloy according to claim 1 or 2, wherein the method comprises the following steps: the Si content in the high-silicon aluminum alloy is 18-30 wt%, and the corresponding liquidus temperature is 680-820 ℃.
8. The preparation method of the high-silicon aluminum alloy rheological slurry according to claim 1, characterized by comprising the following steps: and c, storing the high-silicon aluminum alloy rheological slurry flowing out of the mechanical roller after stirring in a heat preservation furnace, and keeping the furnace temperature at the 5-15 ℃ superheat degree on the liquid phase line.
9. The method for preparing the rheological slurry of the high-silicon aluminum alloy according to claim 8, characterized by comprising the following steps: and immediately carrying out a subsequent forming process within 5-10 seconds after the rheological slurry enters the heat preservation furnace.
10. The method for preparing the rheological slurry of the high-silicon aluminum alloy according to claim 9, characterized by comprising the following steps: and the subsequent forming process comprises the steps of casting to prepare an ingot, and then extruding, forging or rolling to form or directly casting to form.
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| CN103934437A (en) * | 2014-04-01 | 2014-07-23 | 上海交通大学 | Preparation method for primary-silicon-refinement high-silicon aluminum alloy rheological slurry |
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|---|---|---|---|---|
| CN102965551A (en) * | 2012-11-26 | 2013-03-13 | 中国铝业股份有限公司 | Hypereutectic aluminium-silicon alloy and preparation method thereof |
| CN103934437A (en) * | 2014-04-01 | 2014-07-23 | 上海交通大学 | Preparation method for primary-silicon-refinement high-silicon aluminum alloy rheological slurry |
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