CN111485139A - Al-RE-Y alloy and preparation method thereof - Google Patents

Al-RE-Y alloy and preparation method thereof Download PDF

Info

Publication number
CN111485139A
CN111485139A CN202010357853.6A CN202010357853A CN111485139A CN 111485139 A CN111485139 A CN 111485139A CN 202010357853 A CN202010357853 A CN 202010357853A CN 111485139 A CN111485139 A CN 111485139A
Authority
CN
China
Prior art keywords
alloy
casting
temperature
heat
refining
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010357853.6A
Other languages
Chinese (zh)
Other versions
CN111485139B (en
Inventor
叶兵
谢石华
王立扬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Huaqi Aluminum Technology Co ltd
Shanghai Jiaotong University
Original Assignee
Jiangsu Huaqi Aluminum Technology Co ltd
Shanghai Jiaotong University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Huaqi Aluminum Technology Co ltd, Shanghai Jiaotong University filed Critical Jiangsu Huaqi Aluminum Technology Co ltd
Priority to CN202010357853.6A priority Critical patent/CN111485139B/en
Publication of CN111485139A publication Critical patent/CN111485139A/en
Application granted granted Critical
Publication of CN111485139B publication Critical patent/CN111485139B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys 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
    • C22C1/026Alloys 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

Abstract

The invention provides an Al-RE-Y alloy and a preparation method thereof, wherein the alloy comprises 3-11% of RE, 0.1-5% of Y and the balance of Al and other inevitable impurities in percentage by mass, wherein the RE is at least one element of L a and Ce, after the Al-RE-Y alloy is subjected to pressure casting, the room-temperature tensile strength of a die-cast alloy reaches 235MPa and the elongation is 11%, the high-temperature tensile strength at 250 ℃ reaches 120MPa and the elongation is 19%, after gravity casting, the room-temperature tensile strength reaches 140MPa and the elongation is 14%, and the thermal conductivity coefficient is 175W/(m.K), and the alloy can be used without subsequent heat treatment and meets the high-end requirements of industries such as aerospace, military industry and automobiles on light weight development.

Description

Al-RE-Y alloy and preparation method thereof
Technical Field
The invention relates to an Al-RE-Y alloy and a preparation method thereof, belonging to the field of industrial aluminum alloy and manufacturing thereof.
Background
The aluminum alloy is a general term of alloy taking aluminum as a matrix, has the characteristics of small density and higher strength, and has excellent specific strength. The main alloy systems include Al-Si system, Al-Cu system, Al-Mg system, and the like. The method has wide application in the fields of traffic, automobiles, mechanical manufacturing and aerospace. Particularly, the aluminum alloy used as the heat-resistant aluminum alloy for the conductor needs to have better heat resistance under the condition of ensuring good conductivity and oxidation resistance, so that the current-carrying capacity is improved and the loss is reduced. Heat resistant aluminum alloys for use in mechanical equipment are required to maintain good mechanical properties and creep fatigue resistance at relatively high temperatures. In the automotive industry, the aluminum alloy is often subjected to continuous load and vibration in the service process, which has higher requirements on creep fatigue property of parts, so that the demand of the aluminum alloy with special use requirements is higher and higher.
Rare earth has been an element used for refining and strengthening in aluminum alloys, a high strength Al-Zn-Mg aluminum alloy disclosed in Chinese patent application 201910683881.4 (a high strength aluminum alloy) has a composition of, in percent, 5.3-5.7% of Zn, 2.2-2.6% of Mg, 1.3-1.8% of Cu, 0.2-0.5% of Si, 0.3-0.6% of Fe, 0.2-0.4% of Mn, 0.06-0.2% of Cr, 0.06-0.15% of Ce/L a, 0.2-0.8% of Ag, and the balance Al., wherein 0.06-0.15 wt% of rare earth L a/Ce is added thereto, the formation of a rare earth strengthening phase and a dispersed phase is promoted significantly, the precipitated phase dispersion characteristics in the aluminum alloy are improved, thereby the yield strength and strength are significantly improved, but the addition of L a/Ce is generally only added as a microalloying element, the main addition of Ce is not more than L a rare earth element, the addition of Al-Sc 2, the alloy is not more than the one of the high-Al-Sc addition of the alloy, and Sc 2, wherein the high addition of Sc 2 is not more than the high as an element, and the alloy, wherein the composition disclosed in the composition of the invention is not more than the invention, and the high strength of the alloy is not more than the invention, and the invention, wherein the invention is not more than the invention, and the invention is not applicable to the invention, and the invention, wherein the invention is not applicable to the invention, and the invention is not applicable to the invention, and the invention is applicable to the invention, wherein the invention is not applicable to the invention, and the invention is applicable to.
In the light weight of automobiles, most aluminum-silicon alloy is used, the aluminum-silicon alloy is widely used for producing parts such as engine cylinder bodies, cylinder covers, hubs and the like at present, the alloy is A354, A356 and A380, die casting is compared with common gravity casting, the die casting speed is high, the production rate is high, mechanization and automation are easy to realize, and complicated thin-wall parts are formed, secondly, the die casting part is high in size precision, small in surface roughness, and less or no machining is needed in subsequent machining, in the automobile industry, more than 90% of key structural parts use the A380 alloy suitable for die casting, mainly due to good fluidity and excellent obdurability, but the mechanical property and creep fatigue property of the Al-Si system alloy are rapidly reduced at 200 ℃ and above, the normal use cannot be met, in the Al-RE system alloy taking L a/Ce as a main element, the main phase is Al11RE3 phase, the high-temperature stability is far higher than that of the Si phase, the high-temperature stability is far higher than that of the Al11RE3 phase, the high-Si alloy is disclosed in the Chinese patent 201910650876.3 (a near-Co-Al-Ce-Co-Si high-Si-series alloy) and the production process is still capable of producing the high-Si co-Si alloy with the high tensile strength of 0.00-0.00 and the high-0.00 continuous casting cost of the high-0.00 continuous casting process for producing the high-0.00-0.
The Alloy mentioned in International patent publication WO 2017/007908A1 (castable High temperature Ce-deteriorated Aluminum Alloy) discloses that an Aluminum Alloy containing an X element consisting of Ce or L a, the X content is 5-30 wt%, Al11X3 precipitated phase is formed, the disclosed components include Al-8Ce, Al-10Ce, Al-12Ce, the yield strength is between (6.2-8.5 MPa or 43-59MPa), the elongation is > 8%, the Al-6Ce yield strength is 28-40MPa, the Al-16Ce yield strength is 68-70MPa, the elongation is only 2.0-2.5%, the Al-12Ce-0.4Mg yield strength is 76-79MPa, the elongation is only 2.5-6.0%, the Al-12Ce-0.25Zr yield strength is 45MPa, the Al-12Ce-1.3Ti strength is 43-47MPa, the published results thereof (Z.C.SiC.D, D is 0.8-K, Al-0.7 Al-2 Mg-5 Mg-0.4 Al-2-5 Mg-0.25-Al-2-Al-2-Al-2-Al-2-Al-2-Al-2-Al-2-Al-2-Al-.
Therefore, the development of a high-strength and high-toughness heat-resistant die-casting aluminum alloy is urgently needed; in particular to a high-strength heat-resistant die-casting aluminum alloy suitable for pressure casting.
At present, most heat dissipation devices are made of aluminum alloy, mainly comprising cast aluminum alloy and wrought aluminum alloy, the wrought aluminum alloy is dominant in the preparation of the heat dissipation devices, plate welding is generally adopted or sectional materials are directly utilized, the shapes of the heat dissipation devices are more and more complex along with the requirement of product upgrading, the sectional materials and welding parts cannot meet the requirement, therefore, more and more heat dissipation devices need to be manufactured by a casting method, the conventional cast aluminum alloy does not have good heat conduction performance, for example, the heat conductivity of the cast A380 alloy is 105-108W/(m.K), the heat conductivity of the 6061 wrought aluminum alloy is 151-202W/(m.K), therefore, the heat dissipation performance of a heat dissipation device prepared from aluminum alloy with low heat conductivity is greatly reduced, the actual requirement is difficult to meet under many conditions, the heat conductivity of the cast aluminum alloy is required to be improved on the basis of meeting the requirement of market, the heat conductivity of the cast aluminum alloy is required to be improved on the basis of meeting the requirement of mechanical performance, the heat conductivity of the cast aluminum alloy, the preparation method of a high-strength aluminum alloy anode oxide electrolyte and the high-strength aluminum alloy anode oxide film is still disclosed by 0.0.0-0% of the invention, the following method, the invention is a high-0.0.0.0.0-0 aluminum alloy, the invention has the following problems that the heat-0 corrosion-0 corrosion-0 aluminum alloy anode oxide corrosion-0 alloy, the heat-0 corrosion-0 alloy anode film is still produced by the present invention, the heat-0 aluminum alloy, the heat-0 corrosion-0 aluminum alloy anode of the invention, the following heat-0 aluminum alloy, the invention has the following heat-0 alloy, the invention is still has the following method for producing the heat-0 aluminum alloy, the heat-0 aluminum alloy, the invention has the following high-0 aluminum alloy, the invention has the heat-0 alloy, the following high-0 aluminum alloy, the invention has the following heat-0 alloy, the following problems of the heat-0 alloy, the invention is not easy-0 aluminum alloy, the invention has the.
There is therefore also a great need to develop a corrosion resistant aluminium alloy with high thermal conductivity suitable for gravity casting.
Disclosure of Invention
The invention provides an Al-RE-Y alloy and a preparation method thereof, aiming at solving the problem that the application of the existing cast rare earth aluminum alloy is greatly limited because the performance of the cast aluminum alloy such as A380 and the like cannot be achieved due to insufficient obdurability and heat resistance, and the alloy has the room-temperature tensile strength of 235MPa and the elongation of 11 percent after pressure casting; the tensile strength of the high-temperature tensile reaches 120MPa at 250 ℃, and the elongation is 19 percent; after the alloy is cast by gravity, the tensile strength at room temperature reaches 140MPa, and the elongation reaches 14 percent; the thermal conductivity coefficient reaches 175W/(m.K).
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides an Al-RE-Y alloy which comprises the following elements in percentage by mass: 3-11% of RE, 0.1-5% of Y, and the balance of Al element and inevitable impurity elements.
Preferably, the Al-RE-Y alloy comprises the following elements in mass percent: 8-10% of RE, 0.1-3% of Y, and the balance of Al element and inevitable impurity elements.
Preferably, the component of RE is one or a combination of two of L a and Ce.
Compared with the prior art, one of the innovative ideas of the Al-RE-Y-Mg alloy suitable for pressure/gravity casting provided by the invention is that Y element and Ce/L a element are mixed, Y and Ce/L a are cheap rare earth elements, on one hand, the mixing of Y element and L a/Ce element can fine grains well, and meanwhile, the morphology of Al11RE3 phase can be changed from semi-strip shape to fiber shape, so that the segregation of Al11RE3 phase in pure Al-L a/Ce alloy is improved, the structure is more uniform, the performance is better, on the other hand, the mixed addition overcomes the defect that primary Al11RE3 phase is generated when the RE content is higher than 8%, the elongation and the strength of the alloy are greatly improved, and the addition range of the rare earth content is expanded.
The invention provides the second innovative idea of the Al-RE-Y-Mg alloy suitable for pressure/gravity casting, which is that the amount of the strengthening phase is increased by the mixed addition of rare earth elements and Y for the first time, so that the content of the Al11RE3 phase with high heat resistance is more, finer and more uniform in distribution, and the effect of high heat resistance can be exerted, the Al11RE3 phase can be refined by adding Zr, but the addition amount of the Zr cannot exceed 0.3 wt.%, otherwise, a primary Al3Zr phase can be generated, but the content of the added Y can be mixed with L a/Ce, a corresponding primary phase cannot be generated, the RE content is increased from 8% to 16% (RE + Y), the content of the strengthening phase is greatly increased, and the fluidity and the casting performance are not influenced.
The invention provides the third innovative idea of the Al-RE-Y-Mg alloy suitable for pressure/gravity casting, which is as follows: on one hand, the RE element and the Y element have no solubility in aluminum, all intermetallic compounds are generated, and the pure aluminum and the rare earth intermetallic compounds have good heat conductivity, so that the high heat conductivity of the aluminum alloy is ensured. On the other hand, through the mixing of RE and Y elements, the intermetallic compound is refined, so that the aluminum matrix is communicated, and the heat-conducting property of the aluminum matrix is also improved.
The invention also provides a preparation method of the Al-RE-Y alloy, which comprises the following steps:
s1, removing oxide layers of the industrial pure aluminum ingot, the Al-RE and Al-Y intermediate alloy, drying and preheating to 200 ℃; properly considering the burning loss, calculating the consumption of the required raw materials according to the components of the Al-RE-Y alloy and the stoichiometric ratio;
s2, melting an industrial pure aluminum ingot accounting for 25% of the height of the crucible into a molten pool at 720 ℃, and adding the rest industrial pure aluminum ingot;
s3, after the industrial pure aluminum ingot is completely melted, heating to 750 ℃, adding Al-RE and Al-Y intermediate alloy for 2-4 times, keeping the temperature constant at 750 ℃, and stirring until the industrial pure aluminum ingot is completely melted;
s4, preserving heat for 30min, adding a refining agent for refining, raising the temperature of the furnace to 750 ℃, preserving heat, standing for 10-20 min to promote impurity settlement and obtain an aluminum alloy melt;
and S5, cooling the aluminum alloy melt to a casting temperature, skimming surface scum, pressing the melt into a die preheated to 180-250 ℃ by a die casting machine or pouring the melt into the die by gravity casting, and cooling to obtain the Al-RE-Y alloy.
Further, in step S1, removing oxide layers of the aluminum ingot, the magnesium ingot, the Al-RE intermediate alloy and the Al-Y intermediate alloy, drying and preheating to 190-210 ℃; and calculating the required dosage. The aluminum ingot is an industrial pure aluminum ingot, and the magnesium ingot is an industrial pure magnesium ingot.
Further, in step S1, the Al-RE intermediate alloy is Al-20Ce, Al-20L a or a mixed rare earth intermediate alloy of Al and Ce, L a, and the Al-Y intermediate alloy is Al-10Y.
Further, in step S2, after an aluminum ingot 25% of the height of the crucible is melted into a molten pool at 720 ℃, the remaining aluminum ingot is added.
Further, in step S3, the Al-RE and Al-Y master alloys are added for 2-4 times.
Further, in the step S4, when the pressure casting scheme is adopted, 40 to 60 minutes before pressure casting, adding a refining agent for refining after the alloy is completely melted, raising the furnace temperature to 750 ℃, preserving the temperature, standing for 10 to 20 minutes to promote the sedimentation of inclusions, and obtaining an aluminum alloy melt;
further, in step S4, the refining agent comprises, by mass: 55% KCl, 30% NaCl, 15% BaCl2
Further, in step S4, the amount of the refining agent added is 1.0 to 2.5% of the total weight of the raw material.
Further, in step S4, the refining temperature is 720 to 750 ℃, and the stirring time for the refining treatment is 10 to 15 min.
Further, in step S5, the casting temperature is 700-740 ℃.
Further, in step S5, the die casting speed is 1-8 m/S.
The preparation method of the Al-RE-Y alloy provided by the invention has the beneficial effects that: (1) RE and Y are added in the form of intermediate alloy, elements easy to burn and damage are not contained, the components are easy to control, and the smelting process is simple and easy to control; (2) the refining treatment adopts MgCl-free2The special refining agent further reduces the burning loss of the rare earth Y in the refining process; (3) the subsequent heat treatment is not required,and (4) Ce, L a and Y belong to cheap rare earth elements, are suitable for mass production and meet industrial requirements.
Compared with the prior art, the invention has the following beneficial effects:
1) the Al-RE-Y alloy is obtained by pressure casting, the room temperature tensile strength reaches 235MPa, and the elongation is 11%; after the heat preservation is carried out for 200 hours at 250 ℃, the high-temperature tensile strength reaches 120MPa, the elongation is 19 percent, the comprehensive performance is excellent, particularly the elongation is high, and a casting is used for replacing a forging or a section;
2) the Al-RE-Y alloy is obtained by gravity casting, has the advantages of high heat conduction and corrosion resistance, room temperature tensile strength of 140MPa, elongation of 14 percent, heat conductivity of 175W/(m.K), and excellent comprehensive performance;
3) the preparation method provided by the invention has the advantages of simple process, high efficiency, suitability for large-scale production and the like, and meets the high-end requirements of aerospace, military industry, automobiles and other industries on light weight development.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a metallographic structure diagram of a high-toughness heat-resistant Al-RE-Y alloy obtained by pressure casting in example 3;
FIG. 2 is a metallographic structure diagram of a high thermal conductivity and corrosion resistance Al-RE-Y alloy obtained by gravity casting in example 3;
FIG. 3 is a metallographic structure diagram of an alloy obtained by gravity casting in comparative example 1.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
The Al-RE-Y alloy comprises the following components in percentage by weight: according to the theoretical mixture ratio, 11 wt% of Ce, 5 wt% of Y, and the balance of Al element and inevitable impurity elements.
The preparation method comprises (1) properly considering burning loss, and calculating the required raw material amount according to the Al-RE-Y alloy components and the stoichiometric ratio; removing oxide layers of industrial pure aluminum ingots, Al-20Ce and Al-10Y intermediate alloys, drying and preheating to 200 ℃; calculating the consumption of the required raw materials according to the components and the stoichiometric ratio of the alloy; (2) melting an industrial pure aluminum ingot accounting for 25% of the height of the crucible into a molten pool at 720 ℃, and adding the rest aluminum ingot; (3) after the aluminum ingot is completely melted, heating to 750 ℃, adding Al-20Ce and Al-10Y intermediate alloy for 2-4 times, keeping the temperature constant at 750 ℃, and stirring until the aluminum ingot is completely melted; (4) 40-60 minutes before gravity/pressure casting, adding a refining agent accounting for 1 percent of the weight of the raw materials for refining after the alloy is completely melted, wherein the refining temperature is 730 ℃, the stirring time of the refining treatment is 10min, and the refining agent comprises the following components in percentage by mass: 55% KCl, 30% NaCl, 15% BaCl2Raising the furnace temperature to 750 ℃, preserving the temperature and standing for 10 minutes to promote the settlement of impurities to obtain an aluminum alloy melt; (5) cooling the aluminum alloy melt to 720 ℃, skimming surface scum, pressing the melt into a metal mold preheated to 180 ℃ by a die casting machine, and obtaining the high-strength high-toughness heat-resistant die-casting Al-RE-Y alloy at a die casting speed of 4 m/s; or pouring the melt into a metal mold preheated to 250 ℃ through gravity casting to obtain the gravity-cast high-heat-conductivity corrosion-resistant Al-RE-Y alloy.
Respectively carrying out a-room temperature tensile test on the prepared high-strength high-toughness heat-resistant die-casting Al-RE-Y alloy; b, carrying out high-temperature tensile property test at 250 ℃ after 200-hour heat exposure treatment at 250 ℃. In the embodiment, the room-temperature tensile strength, the yield strength and the elongation percentage of the high-strength and high-toughness heat-resistant Al-RE-Y alloy are 255MPa, 155MPa and 7.5 percent; the tensile strength at high temperature of 250 ℃ is 140MPa, and the elongation is 15%.
Respectively carrying out a-room temperature tensile test on the prepared gravity casting high-thermal-conductivity corrosion-resistant Al-Ce-Y alloy; b. and testing the thermal conductivity coefficient at room temperature. In the embodiment, the room-temperature tensile strength, yield strength and elongation percentage of the gravity-cast high-thermal-conductivity corrosion-resistant Al-Ce-Y alloy are 150MPa, 80MPa and 11.0 percent respectively; the thermal conductivity is 160W/(m.K).
Example 2
The Al-RE-Y alloy consists of (by weight) L a3 wt%, Y0.2 wt%, and Al element and inevitable impurity element in balance.
The preparation method comprises the steps of (1) properly considering burning loss, calculating the consumption of required raw materials according to the components and the stoichiometric ratio of the Al-RE-Y alloy, removing oxide layers of an industrial pure aluminum ingot, Al-20L a and Al-10Y intermediate alloy, drying and preheating to 200 ℃, calculating the consumption of the required raw materials according to the components and the stoichiometric ratio of the alloy, (2) melting the industrial pure aluminum ingot accounting for 25% of the height of a crucible into a molten pool at 720 ℃, adding the rest aluminum ingot, (3) heating to 750 ℃ after the aluminum ingot is completely melted, adding the Al-20L a and the Al-10Y intermediate alloy for 2-4 times, keeping the temperature constant at 750 ℃, stirring until the alloy is completely melted, keeping the temperature for 30 minutes, (4) heating to 750 ℃ before pressure casting for 40-60 minutes, adding a refining agent accounting for 2% of the weight of the raw materials for refining at 750 ℃, wherein the stirring time for refining is 15 minutes, and the refining agent comprises 55% of KCl, 30% of NaCl and 15% of BaCl by mass2Raising the furnace temperature to 750 ℃, preserving the temperature and standing for 10 minutes to promote the settlement of impurities to obtain an aluminum alloy melt; (5) cooling the aluminum alloy melt to 740 ℃, skimming surface scum, pressing the melt into a metal mold preheated to 200 ℃ by a die casting machine, and obtaining the high-strength high-toughness heat-resistant die-casting Al-RE-Y alloy at the die casting speed of 2 m/s; or pouring the melt into a metal mold preheated to 200 ℃ through gravity casting to obtain the gravity-cast high-heat-conductivity corrosion-resistant Al-RE-Y alloy.
Respectively carrying out a-room temperature tensile test on the prepared high-strength high-toughness heat-resistant die-casting Al-RE-Y alloy; b, carrying out high-temperature tensile property test at 250 ℃ after 200-hour heat exposure treatment at 250 ℃. In the embodiment, the room-temperature tensile strength of the high-strength and high-toughness heat-resistant Al-RE-Y alloy is 215MPa, the yield strength is 115MPa, and the elongation is 18.8%; the tensile strength at high temperature of 250 ℃ is 80MPa, and the elongation is 25%.
Respectively carrying out a-room temperature tensile test on the prepared gravity casting high-thermal-conductivity corrosion-resistant Al-Ce-Y alloy; b. and testing the thermal conductivity coefficient at room temperature. In the embodiment, the tensile strength of the gravity-cast high-thermal-conductivity corrosion-resistant Al-Ce-Y alloy at room temperature is 110MPa, the yield strength is 59MPa, and the elongation is 19.0%; the thermal conductivity is 195W/(m.K).
Example 3
The Al-RE-Y alloy consists of (by weight) L a 5 wt%, Ce 3 wt%, Y3 wt%, and Al and inevitable impurity elements in balance.
The preparation method comprises the steps of (1) properly considering burning loss, calculating the consumption of required raw materials according to the Al-RE-Y alloy components and the stoichiometric ratio, removing oxide layers of an industrial pure aluminum ingot, Al-20L a, Al-20Ce and Al-10Y intermediate alloy, drying and preheating to 200 ℃, calculating the consumption of the required raw materials according to the components and the stoichiometric ratio of the alloy, (2) melting the industrial pure aluminum ingot accounting for 25% of the height of a crucible into a molten pool at 720 ℃, adding the rest aluminum ingot, (3) heating to 750 ℃ after the aluminum ingot is completely melted, adding Al-20L a, Al-20Ce and Al-10Y intermediate alloy for 2-4 times, keeping the temperature constant at 750 ℃, stirring until the alloy is completely melted and preserving heat for 30 minutes, (4) heating to 750 ℃ before pressure casting for 40-60 minutes, adding 1.5% of a refining agent according to the weight of the alloy for refining, wherein the refining temperature is 740 ℃, the stirring time for refining is 12 minutes, and the components of the refining agent are NaCl, 55% by mass, 15% of BaCl and 15% by mass2Raising the furnace temperature to 750 ℃, preserving the temperature and standing for 10 minutes to promote the settlement of impurities to obtain an aluminum alloy melt; (5) cooling the aluminum alloy melt to 720 ℃, skimming surface scum, pressing the melt into a metal mold preheated to 250 ℃ by a die casting machine, and obtaining the high-strength high-toughness heat-resistant die-casting Al-RE-Y alloy at the die casting speed of 1 m/s; or pouring the melt into a metal mold preheated to 250 ℃ through gravity casting to obtain the gravity-cast high-heat-conductivity corrosion-resistant Al-RE-Y alloy.
Respectively carrying out a-room temperature tensile test on the prepared high-strength high-toughness heat-resistant die-casting Al-RE-Y alloy; b, carrying out high-temperature tensile property test at 250 ℃ after 200-hour heat exposure treatment at 250 ℃. In the embodiment, the room-temperature tensile strength of the high-strength and high-toughness heat-resistant Al-RE-Y alloy is 235MPa, the yield strength is 125MPa, and the elongation is 11%; the tensile strength at high temperature of 250 ℃ is 120MPa, and the elongation is 19%. The metallographic structure of the die casting alloy is shown in fig. 1, eutectic Al11RE3 phase in the structure is uniformly and finely distributed, and a primary Al11RE3 phase hardly exists, so that the alloy has good heat resistance and strength. The presence of rosette pure aluminum dendrites in the crystalline phase provides the alloy with high toughness.
Respectively carrying out a-room temperature tensile test on the prepared gravity casting high-thermal-conductivity corrosion-resistant Al-Ce-Y alloy; b. and testing the thermal conductivity coefficient at room temperature. In the embodiment, the room-temperature tensile strength of the gravity-cast high-thermal-conductivity corrosion-resistant Al-Ce-Y alloy is 140MPa, the yield strength is 85MPa, and the elongation is 14.0%; thermal conductivity 175W/(m.K). As shown in FIG. 2, the metallurgical structure of the alloy is such that the primary Al11RE3 phase is hardly present in the structure and the aluminum dendrites are dendritic. The Al11RE3 phase in the eutectic structure is uniformly distributed and has certain dendritic characteristics. This allows the Al in the alloy to be connected with each other, and has excellent heat conductivity and good elongation.
Example 4
The Al-RE-Y alloy consists of 8 wt% L a, 1 wt% Ce, 2 wt% Y, and Al element and inevitable impurity element for the rest.
The preparation method comprises the steps of (1) properly considering burning loss, calculating the consumption of required raw materials according to the Al-RE-Y alloy components and the stoichiometric ratio, removing oxide layers of an industrial pure aluminum ingot, Al-20L a, Al-20Ce and Al-10Y intermediate alloy, drying and preheating to 200 ℃, calculating the consumption of the required raw materials according to the components and the stoichiometric ratio of the alloy, (2) melting the industrial pure aluminum ingot accounting for 25% of the height of a crucible into a molten pool at 720 ℃, adding the rest aluminum ingot, (3) heating to 750 ℃ after the aluminum ingot is completely melted, adding Al-20L a, Al-20Ce and Al-10Y intermediate alloy for 2-4 times, keeping the temperature constant at 750 ℃, stirring until the alloy is completely melted and preserving heat for 30 minutes, (4) heating to 750 ℃ before pressure casting for 40-60 minutes, adding 2.5% of a refining agent according to the weight of the alloy for refining, wherein the refining temperature is 750 ℃, the stirring time for refining is 10 minutes, and the components of the refining agent are NaCl, 55%, 15% and 15% of BaCl in mass percentage2The furnace temperatureHeating to 750 ℃, preserving heat and standing for 10 minutes to promote the settlement of impurities to obtain an aluminum alloy melt; (5) cooling the aluminum alloy melt to 720 ℃, skimming surface scum, pressing the melt into a metal mold preheated to 240 ℃ by a die casting machine, and obtaining the high-strength high-toughness heat-resistant die-casting Al-RE-Y alloy at the die casting speed of 5 m/s; or pouring the melt into a metal mold preheated to 240 ℃ through gravity casting to obtain the gravity-cast high-heat-conductivity corrosion-resistant Al-RE-Y alloy.
Respectively carrying out a-room temperature tensile test on the prepared high-strength high-toughness heat-resistant die-casting Al-RE-Y alloy; b, carrying out high-temperature tensile property test at 250 ℃ after 200-hour heat exposure treatment at 250 ℃. In the embodiment, the room-temperature tensile strength of the high-strength and high-toughness heat-resistant Al-RE-Y alloy is 225MPa, the yield strength is 120MPa, and the elongation is 12%; the tensile strength at high temperature of 250 ℃ is 112MPa, and the elongation is 20%.
Respectively carrying out a-room temperature tensile test on the prepared gravity casting high-thermal-conductivity corrosion-resistant Al-Ce-Y alloy; b. and testing the thermal conductivity coefficient at room temperature. In the embodiment, the room-temperature tensile strength of the gravity-cast high-thermal-conductivity corrosion-resistant Al-Ce-Y alloy is 125MPa, the yield strength is 71MPa, and the elongation is 16.0%; thermal conductivity 181W/(m.K)
Example 5
The Al-RE-Y alloy consists of (by weight) L a 11 wt%, Y1 wt%, and Al element and inevitable impurity element in balance.
The preparation method comprises the steps of (1) properly considering burning loss, calculating the consumption of required raw materials according to the components and the stoichiometric ratio of the Al-RE-Y alloy, removing oxide layers of an industrial pure aluminum ingot, Al-20L a and Al-10Y intermediate alloy, drying and preheating to 200 ℃, calculating the consumption of the required raw materials according to the components and the stoichiometric ratio of the alloy, (2) melting the industrial pure aluminum ingot accounting for 25% of the height of a crucible into a molten pool at 720 ℃, adding the rest aluminum ingot, (3) heating to 750 ℃ after the aluminum ingot is completely melted, adding the Al-20L a and the Al-10Y intermediate alloy for 2-4 times, keeping the temperature constant at 750 ℃, stirring until the alloy is completely melted, keeping the temperature for 30 minutes, (4) refining by adding a refining agent accounting for 40-60 minutes before pressure casting, and adding the refining agent accounting for 1% of the weight of the raw materials after the alloy is completely melted, wherein the refining temperature is highAnd (2) stirring for 10min at the temperature of 720 ℃, wherein the refining agent comprises the following components in percentage by mass: 55% KCl, 30% NaCl, 15% BaCl2Raising the furnace temperature to 750 ℃, preserving the temperature and standing for 10 minutes to promote the settlement of impurities to obtain an aluminum alloy melt; (5) cooling the aluminum alloy melt to 740 ℃, skimming surface scum, pressing the melt into a metal mold preheated to 250 ℃ by a die casting machine, and obtaining the high-strength high-toughness heat-resistant die-casting Al-RE-Y alloy at the die casting speed of 8 m/s; or pouring the melt into a metal mold preheated to 250 ℃ through gravity casting to obtain the gravity-cast high-heat-conductivity corrosion-resistant Al-RE-Y alloy.
Respectively carrying out a-room temperature tensile test on the prepared high-strength high-toughness heat-resistant die-casting Al-RE-Y alloy; b, carrying out high-temperature tensile property test at 250 ℃ after 200-hour heat exposure treatment at 250 ℃. In the embodiment, the room-temperature tensile strength of the high-strength and high-toughness heat-resistant Al-RE-Y alloy is 230MPa, the yield strength is 130MPa, and the elongation is 11.5%; the tensile strength at high temperature of 250 ℃ is 120MPa, and the elongation is 19%.
Respectively carrying out a-room temperature tensile test on the prepared gravity casting high-thermal-conductivity corrosion-resistant Al-Ce-Y alloy; b. and testing the thermal conductivity coefficient at room temperature. In the embodiment, the room-temperature tensile strength of the gravity-cast high-thermal-conductivity corrosion-resistant Al-Ce-Y alloy is 125MPa, the yield strength is 73MPa, and the elongation is 15.0%; the thermal conductivity is 180W/(m.K).
Comparative example 1
The comparative example provides an alloy having, in theoretical proportions, 2 wt% L a, 3 wt% Ce, 0.2 wt% Sc, and the balance Al and unavoidable impurity elements, and having substantially the same composition as that of example 2, except that in example 3, inexpensive Y is replaced with expensive 0.2 wt% Sc.
Respectively carrying out a-room temperature tensile test on the prepared pressure casting alloy; b, carrying out high-temperature tensile property test at 250 ℃ after 200-hour heat exposure treatment at 250 ℃. In the comparative example, the tensile strength of the alloy at room temperature is 230MPa, the yield strength is 118MPa, and the elongation is 5.2 percent; the tensile strength at high temperature of 250 ℃ is 92MPa, and the elongation is 8.5%.
Respectively carrying out a-room temperature tensile test on the prepared gravity casting alloy; b. testing the heat conductivity coefficient at room temperature; c.600 ℃ solution treatment followed by T6 aging at 350 ℃ was followed by further room temperature tensile testing. In the comparative example, the tensile strength of the alloy at room temperature is 110MPa, the yield strength is 65MPa, and the elongation is 5.0 percent; thermal conductivity 152W/(m.K). The room-temperature tensile strength of the T6 aged state is 204MPa, the yield strength is 151MPa, and the elongation is 4.1%.
The metallographic structure of the alloy is shown in FIG. 3, the primary Al11RE3 phase is hardly contained in the structure, but the eutectic phase is segregated and discontinuous, is mostly in the form of lath, and seriously reduces the elongation of the alloy, and the alloy shows heat treatment strengthening after being subjected to T6 heat treatment, and the principle of the heat treatment is that the added Sc element is dissolved into α -Al aluminum matrix to form a dispersed precipitation phase Al matrix during the heat treatment3Sc, which improves strength but is disadvantageous in elongation, is a typical precipitation-strengthening phase behavior. And the Al-RE-Y alloy containing Y shows that Al11RE3 phase is uniformly refined and distributed, the elongation is excellent, and the performance temperature in the heat treatment process is not improved or reduced, particularly the elongation is not reduced. While the price of 0.2 wt.% Sc in this comparative example is more than 5 times higher than 3 wt.% Y in example 3.
The above description is a detailed description of specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims (10)

1. An Al-RE-Y alloy characterized by: comprises the following elements in percentage by mass: 3-11% of RE, 0.1-5% of Y, and the balance of Al element and inevitable impurity elements.
2. The Al-RE-Y alloy of claim 1, wherein: comprises the following elements in percentage by mass: 8-10% of RE, 0.1-3% of Y, and the balance of Al element and inevitable impurity elements.
3. The Al-RE-Y alloy according to claim 1 or 2, wherein the RE has a composition of one or a combination of two of Ce and L a.
4. The method for producing an Al-RE-Y alloy according to any one of claims 1 to 3, wherein: the method comprises the following steps:
s1, removing oxide layers of the industrial pure aluminum ingot, the Al-RE and Al-Y intermediate alloy, drying and preheating to 200 ℃; properly considering the burning loss, calculating the consumption of the required raw materials according to the components of the Al-RE-Y alloy and the stoichiometric ratio;
s2, melting an industrial pure aluminum ingot which accounts for 22-28% of the height of the crucible into a molten pool at 715-725 ℃, and adding the rest of the industrial pure aluminum ingot;
s3, after the industrial pure aluminum ingot is completely melted, heating to 750 ℃, adding Al-RE and Al-Y intermediate alloy in batches, keeping the temperature constant at 750 ℃, and stirring until the industrial pure aluminum ingot is completely melted;
s4, preserving heat for 30min, adding a refining agent for refining, raising the temperature of the furnace to 750 ℃, preserving heat, standing for 10-20 min to promote impurity settlement and obtain an aluminum alloy melt;
and S5, cooling the aluminum alloy melt to a casting temperature, skimming surface scum, pressing the melt into a die preheated to 180-250 ℃ by a die casting machine or pouring the melt into the die by gravity casting, and cooling to obtain the Al-RE-Y alloy.
5. The method of claim 4, wherein in step S1, the Al-RE master alloy is Al-20Ce, Al-20L a or a mischmetal master alloy of Al and Ce, L a, and the Al-Y master alloy is Al-10Y.
6. The method of producing the Al-RE-Y alloy according to claim 4, wherein: in step S4, the refining agent comprises the following components in percentage by mass: 55% KCl, 30% NaCl, 15% BaCl2
7. The method of producing the Al-RE-Y alloy according to claim 4, wherein: in the step S4, the addition amount of the refining agent is 1.0-2.5% of the total weight of the raw materials.
8. The method of producing the Al-RE-Y alloy according to claim 4, wherein: and step S4, wherein the refining temperature is 720-750 ℃, and the stirring time of the refining treatment is 10-15 min.
9. The method of producing the Al-RE-Y alloy according to claim 4, wherein: in the step S5, the casting temperature is 700-740 ℃.
10. The method of producing the Al-RE-Y alloy according to claim 4, wherein: in step S5, the die casting speed is 1-8 m/S.
CN202010357853.6A 2020-04-29 2020-04-29 Al-RE-Y alloy and preparation method thereof Active CN111485139B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010357853.6A CN111485139B (en) 2020-04-29 2020-04-29 Al-RE-Y alloy and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010357853.6A CN111485139B (en) 2020-04-29 2020-04-29 Al-RE-Y alloy and preparation method thereof

Publications (2)

Publication Number Publication Date
CN111485139A true CN111485139A (en) 2020-08-04
CN111485139B CN111485139B (en) 2022-04-22

Family

ID=71813206

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010357853.6A Active CN111485139B (en) 2020-04-29 2020-04-29 Al-RE-Y alloy and preparation method thereof

Country Status (1)

Country Link
CN (1) CN111485139B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105463269A (en) * 2015-12-01 2016-04-06 上海交通大学 High-strength and high-corrosion-resistance cast aluminum alloy and pressure casting preparation method thereof
CN108220693A (en) * 2017-12-28 2018-06-29 上海交通大学 A kind of Heat-resistant aluminum alloy of big content of rare earth and preparation method thereof
CN108642338A (en) * 2018-06-28 2018-10-12 太仓新浏精密五金有限公司 Pack alloy
CN109972003A (en) * 2019-04-03 2019-07-05 上海交通大学 High-elongation heat-resisting aluminium alloy and preparation method thereof suitable for gravitational casting
CN110343912A (en) * 2019-07-18 2019-10-18 上海交通大学 A kind of rare-earth heat-resistant aluminium alloy conductor material and preparation method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105463269A (en) * 2015-12-01 2016-04-06 上海交通大学 High-strength and high-corrosion-resistance cast aluminum alloy and pressure casting preparation method thereof
CN108220693A (en) * 2017-12-28 2018-06-29 上海交通大学 A kind of Heat-resistant aluminum alloy of big content of rare earth and preparation method thereof
CN108642338A (en) * 2018-06-28 2018-10-12 太仓新浏精密五金有限公司 Pack alloy
CN109972003A (en) * 2019-04-03 2019-07-05 上海交通大学 High-elongation heat-resisting aluminium alloy and preparation method thereof suitable for gravitational casting
CN110343912A (en) * 2019-07-18 2019-10-18 上海交通大学 A kind of rare-earth heat-resistant aluminium alloy conductor material and preparation method

Also Published As

Publication number Publication date
CN111485139B (en) 2022-04-22

Similar Documents

Publication Publication Date Title
CN108300907B (en) Al-Mn-Si-Mg alloy material and preparation method thereof
WO2011035652A1 (en) High-strength heat-proof aluminum alloy material containing lithium and rare earth and producing method thereof
CN109881062B (en) High-strength, high-toughness and high-modulus extrusion casting magnesium alloy and preparation method thereof
CN109881063B (en) High-strength, high-toughness and high-modulus die-casting magnesium alloy and preparation method thereof
CN111690849A (en) Refining method of iron-rich phase in Al-Si series die-casting aluminum alloy and alloy
CN111321326B (en) Al-RE-Y-Mg alloy and preparation method thereof
CN111378875B (en) High-thermal-conductivity corrosion-resistant Al-RE-Y-Zr alloy suitable for gravity casting and preparation method thereof
CN111378878B (en) High-ductility non-heat-treatment die-casting aluminum alloy and preparation method thereof
CN102002617B (en) Cast aluminum alloy for automobile and preparation method thereof
CN109930045B (en) High-strength-toughness heat-resistant Mg-Gd alloy suitable for gravity casting and preparation method thereof
CN111101031B (en) Al-Mg2Si-Mg-Mn-Y-B high-strength and high-toughness aluminum alloy and preparation method thereof
WO2011035654A1 (en) High-strength heat-proof aluminum alloy material containing beryllium and rare earth and producing method thereof
CN111411268B (en) High-strength-toughness heat-resistant Al-RE-Y-Zr alloy suitable for pressure casting and preparation method thereof
JP3346186B2 (en) Aluminum alloy material for casting and forging with excellent wear resistance, castability and forgeability, and its manufacturing method
CN113969366A (en) High-strength and high-toughness cast aluminum alloy and preparation method thereof
EP0559694B1 (en) Method of preparing improved hyper-eutectic alloys and composites based thereon
CN112921209B (en) Ultrahigh-heat-conductivity high-plasticity medium-strength aluminum alloy and preparation method thereof
CN112941377B (en) Er-containing cast heat-resistant Al-Si-Cu-Mg alloy
CN111485130B (en) Al-RE-Y alloy refiner and continuous casting and rolling preparation method thereof
CN112609109A (en) Ce-Mg-containing high-strength heat-resistant aluminum alloy and preparation method thereof
CN112695234A (en) Corrosion-resistant aluminum alloy and preparation method thereof
CN110387490B (en) Cast aluminum-silicon alloy with high heat conductivity and preparation method thereof
CN111485139B (en) Al-RE-Y alloy and preparation method thereof
CN109807302B (en) High-strength high-toughness heat-resistant die-casting Mg-Gd alloy and preparation method thereof
WO2020052129A1 (en) Rare-earth aluminum alloy material having high ductility and high strength and preparation method therefor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant