CN112593129A - ZrB2Ceramic particle modified Al-Zn-Mg-Cu aluminum alloy welding rod and preparation method thereof - Google Patents
ZrB2Ceramic particle modified Al-Zn-Mg-Cu aluminum alloy welding rod and preparation method thereof Download PDFInfo
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- CN112593129A CN112593129A CN202011460933.0A CN202011460933A CN112593129A CN 112593129 A CN112593129 A CN 112593129A CN 202011460933 A CN202011460933 A CN 202011460933A CN 112593129 A CN112593129 A CN 112593129A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
- B23K35/286—Al as the principal constituent
- B23K35/288—Al as the principal constituent with Sn or Zn
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0073—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only borides
Abstract
The invention discloses a ZrB2The ceramic particle modified Al-Zn-Mg-Cu aluminum alloy welding rod comprises the following components in percentage by mass: 4.0-6.7 wt.% Zn, 1.6-2.0 wt.% Mg, 0.5-2.0 wt.% Cu, 0.5-5.0 wt.% ZrB2And the balance is Al. Wherein, said ZrB2From K2ZrF6Powder and KBF4In situ reaction of the powder to form, K2ZrF6Powder and KBF4The mass ratio of the powder is 1:1.13-1: 1.25. The aluminum alloy welding rod provided by the invention is used for carrying out fusion welding on 7055 aluminum alloy which is subjected to spray forming, the strength of a welding joint reaches 296MPa, and the tensile strength of the welding joint after T76 heat treatment is as high as 530MPa, which is about 88% of the strength of a base metal. The method is suitable for welding the 7xxx series high-strength aluminum alloy.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy welding rods, and particularly relates to ZrB2An Al-Zn-Mg-Cu aluminum alloy welding rod modified by ceramic particles and a preparation method thereof.
Background
The aluminum alloy has the advantages of small specific gravity, high specific strength, easy processing and the like, and is widely applied in the fields of aerospace, high-speed ships, railway vehicles and war industry. But the problems of softening and poor plasticity of the aluminum alloy fusion welding joint become the bottleneck restricting the application of the aluminum alloy fusion welding joint. At present, Friction Stir Welding (FSW) is mainly adopted to weld the 7xxx series high-strength aluminum alloy, because FSW has the advantages of small welding heat input, fine weld grains, no need of adding welding wires, small residual stress after welding, small deformation and the like. However, the FSW process is fully mechanized and the workpiece needs to be constrained in a well designed tooling fixture, so it is difficult to weld components of complex shapes. The welding of complex components made of 7xxx series high-strength aluminum alloy must adopt fusion welding. At present, ER5183, ER5356 or ER4043 welding wires are generally adopted to weld 7xxx series aluminum alloys, and the problem of softening of a melting welding head cannot be overcome.
Disclosure of Invention
The invention aims to provide the ZrB with simple preparation process and excellent performance aiming at the problems of tool constraint, incapability of welding shape complex parts and the like of the existing FSW welding process2An Al-Zn-Mg-Cu aluminum alloy welding rod modified by ceramic particles.
The aluminum alloy welding rod can adjust the component proportion according to different aluminum alloy weldments. The welding rod modified by the ceramic particles can introduce the ceramic particles into a welding line as a reinforcing phase, so that the effects of refining crystal grains and pinning dislocation are achieved, and a fusion welding joint with excellent mechanical properties is obtained. The application range of the method is expanded to a great extent, and the method has good application prospect.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
ZrB2Ceramic particle modified Al-Zn-Mg-Cu aluminum alloy welding rodThe weight percentage content is as follows: 4.0-6.7 wt.% Zn, 1.6-2.0 wt.% Mg, 0.5-2.0 wt.% Cu, 0.5-5.0 wt.% ZrB2The balance of Al, the total mass percent content is 100%. Wherein, said ZrB2From K2ZrF6Powder and KBF4In situ reaction of the powder to form, K2ZrF6Powder and KBF4The mass ratio of the powder is 1:1.13-1: 1.25.
More preferably, the Al is pure aluminum with a purity of > 99%, the Mg is pure magnesium with a purity of > 99%, the Zn is pure zinc with a purity of > 99%, and the Cu is pure copper with a purity of > 99%.
Further preferably, K is2ZrF6Purity of (2)>98% of said KBF4Purity of (2)>98％。
In order to achieve the above purpose, the present invention is realized by adopting another technical scheme as follows.
ZrB2The preparation method of the ceramic particle modified Al-Zn-Mg-Cu aluminum alloy welding rod comprises the following steps:
1. putting Al in a graphite crucible in a resistance furnace, heating to 780-830 ℃, and completely melting;
2. mixing KBF4And K2ZrF6Adding inorganic salt powder with the mass ratio of 1 (1.13-1.25) into the molten aluminum prepared in the step 1, and carrying out in-situ reaction to generate ZrB2Particle, wherein an electromagnetic stirrer is opened in the reaction process, and the electromagnetic frequency is 10 HZ;
3. after the in-situ reaction is carried out for 20-30 min, C accounting for 1 wt.% of the mass of the Al is added2Cl6The powder is used for degassing and purification; and slagging off the melt;
4. after slagging off, when the temperature of the melt is reduced to 740-760 ℃, adding Cu accounting for 0.8 wt.% of the mass of the Al and Zn accounting for 4.5 wt.% of the mass of the Al; after 10min, after Cu and Zn are completely dissolved, C accounting for 1 wt.% of the mass of the Al is added again2Cl6The powder is used for degassing and purifying the composite melt; and slagging off the melt;
5. after the slag is taken off, when the temperature of the melt is reduced to 700-720 ℃, Al is added1.6 wt.% of Mg, and after 10min, C accounting for 1 wt.% of the Al is added again after the Mg is melted2Cl6The powder is used for degassing and purifying the composite melt; and slagging off the melt;
6. after the slag is removed, standing the melt for 10min, pouring the melt into a mold for cooling and solidifying to obtain 0.5-5.0 wt.% of ZrB2Ceramic particle modified Al-Zn-Mg-Cu aluminum alloy ingot and processing the ingot into a welding rod with required size.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention prepares ZrB-containing2An aluminum alloy of ceramic particles is cast and made into a desired size electrode. ZrB prepared by using the method2The ceramic particle modified Al-Zn-Mg-Cu aluminum alloy welding rod performs fusion welding on 7055 aluminum alloy which is formed by spraying, the strength of a welding joint reaches 296MPa, and the tensile strength of the welding joint after T76 heat treatment reaches 530MPa, which is about 88% of the strength of a base material. The method has simple process, can adjust the components of the welding rod according to the components of the weldment, has component controllability, is suitable for welding the 7xxx series high-strength aluminum alloy, and has good application prospect.
Drawings
FIG. 1 is 1.5 wt.% ZrB2The metallographic phase and SEM appearance of the Al-Zn-Mg-Cu aluminum alloy welding rod modified by the ceramic particles are shown as metallographic phase (a); SEM topography (b).
Fig. 2 is a 7055 fusion welded joint metallographic phase.
FIG. 3 is 1.5 wt.% ZrB27055 fusion welding weld joint metallographic phase.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
Raw materials: the matrix material used in the test was pure aluminum (purity)>99%) and pure magnesium (purity)>99%) pureCopper (purity)>99 percent) and pure zinc (purity)>99%) of reaction salt is K2ZrF6(purity of>98％)、KBF4(purity of>98%) powder, C2Cl6And (3) powder. The raw materials are all commercially available.
ZrB2The ceramic particle modified Al-Zn-Mg-Cu aluminum alloy welding rod comprises the following components in percentage by mass: 4.0-6.7 wt.% Zn, 1.6-2.0 wt.% Mg, 0.5-2.0 wt.% Cu, 0.5-5.0 wt.% ZrB2The balance is Al, and the total mass percent content is 100 wt.%. Wherein, said ZrB2From K2ZrF6Powder and KBF4In situ reaction of the powder to form, K2ZrF6Powder and KBF4The mass ratio of the powder is 1:1.13-1: 1.25.
Example 1
ZrB2Al-Zn-Mg-Cu aluminum alloy welding rod with ceramic particles
First, formula
The material comprises the following elements in percentage by mass: zn 4.5 wt.%, Mg 1.6 wt.%, Cu 0.8 wt.%, ZrB2Ceramic particles 0.5 wt.%, with the balance being Al. The total mass percent content is 100 wt.%.
Secondly, the preparation method comprises the following steps:
step 1, putting pure aluminum in a graphite crucible in a resistance furnace, heating to 780 ℃ and completely melting.
Step 2, adding an aluminum foil bag filled with inorganic salt powder with the mass ratio of 1:1.13 into the molten aluminum obtained in the step 1, and carrying out in-situ reaction to generate ZrB2And (3) particles, wherein an electromagnetic stirrer is opened in the reaction process, and the electromagnetic frequency is 10 HZ.
Step 3, after the in-situ reaction is carried out for 20min, C accounting for 1 wt.% of the mass of the pure aluminum is added2Cl6The powder is used for degassing and purification; and skimming the melt.
And 4, step 4: after slagging off, when the temperature of the melt is reduced to 740 ℃, adding pure copper accounting for 0.8 wt.% of the mass of the pure aluminum and pure zinc accounting for 4.5 wt.% of the mass of the pure aluminum; after 10min, after copper and zinc are completely dissolved, C accounting for 1 wt.% of the pure aluminum is added again2Cl6Powder for degassing composite meltPurifying; and skimming the melt.
And 5: after slagging off, when the temperature of the melt is reduced to 700 ℃, adding magnesium accounting for 1.6 wt.% of the mass of the aluminum ingot, and after 10min, adding C accounting for 1 wt.% of the mass of the pure aluminum again after the magnesium is melted2Cl6The powder is used for degassing and purifying the composite melt; and skimming the melt.
Step 6: after the slag is removed, the melt is kept stand for 10min and poured into a mold for cooling and solidification to obtain 0.5 wt.% of ZrB2Ceramic particle modified Al-Zn-Mg-Cu aluminum alloy ingot and processing the ingot into a welding rod with required size.
Third, beneficial effect
To verify the weldability of the wire, the wire produced in example 1 was used with 0.5 wt.% ZrB2The Al-Zn-Mg-Cu aluminum alloy welding rod of the ceramic particles is used for carrying out fusion welding and detection on 7055 aluminum alloy, the strength of a welding joint is 271MPa, T76 heat treatment is carried out on the welding joint, and the strength of the welding joint is 490 MPa.
Example 2
ZrB2Al-Zn-Mg-Cu aluminum alloy welding rod with ceramic particles
First, formula
The material comprises the following elements in percentage by mass: zn 5.4 wt.%, Mg 1.8 wt.%, Cu 1.1 wt.%, ZrB2Ceramic particles 1.0 wt.%, with the balance being Al. The total mass percent content is 100 wt.%.
Secondly, the preparation method comprises the following steps:
step 1, putting pure aluminum in a graphite crucible in a resistance furnace, heating to 800 ℃ and completely melting.
Step 2, adding an aluminum foil bag filled with inorganic salt powder with the mass ratio of 1:1.17 into the molten aluminum prepared in the step 1, and carrying out in-situ reaction to generate ZrB2And (3) particles, wherein an electromagnetic stirrer is opened in the reaction process, and the electromagnetic frequency is 10 HZ.
Step 3, after the in-situ reaction is carried out for 25min, C accounting for 1 wt.% of the mass of the pure aluminum is added2Cl6The powder is used for degassing and purification; and skimming the melt.
And 4, step 4: after the slag is taken off, the temperature of the melt is measuredWhen the temperature is reduced to 750 ℃, adding pure copper accounting for 1.1 wt.% of the mass of the pure aluminum and pure zinc accounting for 5.4 wt.% of the mass of the pure aluminum; after 10min, after copper and zinc are completely dissolved, C accounting for 1 wt.% of the pure aluminum is added again2Cl6The powder is used for degassing and purifying the composite melt; and skimming the melt.
And 5: after slagging off, when the temperature of the melt is reduced to 700 ℃, adding magnesium accounting for 1.8 wt.% of the mass of the aluminum ingot, and after 10min, adding C accounting for 1 wt.% of the mass of the pure aluminum again after the magnesium is melted2Cl6The powder is used for degassing and purifying the composite melt; and skimming the melt.
Step 6: after the slag is removed, the melt is kept stand for 10min and poured into a mold for cooling and solidification to obtain 1.0 wt.% of ZrB2Ceramic particle modified Al-Zn-Mg-Cu aluminum alloy ingot and processing the ingot into a welding rod with required size.
Third, beneficial effect
To verify the weldability of the wire, the wire produced in example 1 was used to contain 1.0 wt.% ZrB2The Al-Zn-Mg-Cu aluminum alloy welding rod of the ceramic particles is used for carrying out fusion welding and detection on 7055 aluminum alloy, the strength of a welding joint is 282MPa, T76 heat treatment is carried out on the welding joint, and the strength of the welding joint is 499 MPa.
Example 3
ZrB2Al-Zn-Mg-Cu aluminum alloy welding rod with ceramic particles
First, formula
The material comprises the following elements in percentage by mass: zn 6.5 wt.%, Mg 1.8 wt.%, Cu 1.7 wt.%, ZrB2Ceramic particles 1.5 wt.%, with Al as the balance. The total mass percent content is 100 wt.%.
Secondly, the preparation method comprises the following steps:
step 1, putting pure aluminum in a graphite crucible in a resistance furnace, heating to 820 ℃ and completely melting.
Step 2, adding an aluminum foil bag filled with inorganic salt powder with the mass ratio of 1:1.20 into the molten aluminum prepared in the step 1, and carrying out in-situ reaction to generate ZrB2And (3) particles, wherein an electromagnetic stirrer is opened in the reaction process, and the electromagnetic frequency is 10 HZ.
Step 3, after the in-situ reaction is carried out for 25min, C accounting for 1 wt.% of the mass of the pure aluminum is added2Cl6The powder is used for degassing and purification; and skimming the melt.
And 4, step 4: after slagging off, when the temperature of the melt is reduced to 750 ℃, adding pure copper accounting for 1.7 wt.% of the mass of the pure aluminum and pure zinc accounting for 6.5 wt.% of the mass of the pure aluminum; after 10min, after copper and zinc are completely dissolved, C accounting for 1 wt.% of the pure aluminum is added again2Cl6The powder is used for degassing and purifying the composite melt; and skimming the melt.
And 5: after slagging off, when the temperature of the melt is reduced to 720 ℃, adding magnesium accounting for 1.8 wt.% of the mass of the aluminum ingot, and after 10min, adding C accounting for 1 wt.% of the mass of the pure aluminum again after the magnesium is melted2Cl6The powder is used for degassing and purifying the composite melt; and skimming the melt.
Step 6: after the slag is removed, the melt is kept stand for 10min and poured into a mold for cooling and solidification to obtain 1.5 wt.% of ZrB2Ceramic particle modified Al-Zn-Mg-Cu aluminum alloy ingot and processing the ingot into a welding rod with required size. 1.5 wt.% ZrB2The metallographic phase of the Al-Zn-Mg-Cu aluminum alloy electrode modified by the ceramic particles is shown in a figure 1(a), and the SEM appearance is shown in a figure 1 (b).
Third, beneficial effect
To verify the weldability of the wire, the wire produced in example 1 was used to contain 1.5 wt.% ZrB2The Al-Zn-Mg-Cu aluminum alloy welding rod of the ceramic particles is used for carrying out fusion welding and detection on 7055 aluminum alloy, the strength of a welding joint is 310MPa, T76 heat treatment is carried out on the welding joint, and the strength of the welding joint is 524 MPa. The 7055 aluminum alloy fusion welding joint metallographic phase is shown in figure 2; 1.5 wt.% ZrB2The metallographic phase of the-7055 aluminum alloy fusion welded joint is shown in FIG. 3.
Example 4
ZrB2Al-Zn-Mg-Cu aluminum alloy welding rod with ceramic particles
First, formula
The material comprises the following elements in percentage by mass: 6.7 wt.% Zn, 2.0 wt.% Mg, 2.0 wt.% Cu，ZrB23.0 wt.% ceramic particles, with the balance being Al. The total mass percent content is 100 wt.%.
Secondly, the preparation method comprises the following steps:
step 1, putting pure aluminum in a graphite crucible in a resistance furnace, heating to 830 ℃, and completely melting.
Step 2, adding an aluminum foil bag filled with inorganic salt powder with the mass ratio of 1:1.25 into the molten aluminum prepared in the step 1, and carrying out in-situ reaction to generate ZrB2And (3) particles, wherein an electromagnetic stirrer is opened in the reaction process, and the electromagnetic frequency is 10 HZ.
Step 3, after the in-situ reaction is carried out for 30min, C accounting for 1 wt.% of the mass of the pure aluminum is added2Cl6The powder is used for degassing and purification; and skimming the melt.
And 4, step 4: after slagging off, when the temperature of the melt is reduced to 760 ℃, adding pure copper accounting for 2.0 wt.% of the mass of the pure aluminum and pure zinc accounting for 6.7 wt.% of the mass of the pure aluminum; after 10min, after copper and zinc are completely dissolved, C accounting for 1 wt.% of the pure aluminum is added again2Cl6The powder is used for degassing and purifying the composite melt; and skimming the melt.
And 5: after slagging off, when the temperature of the melt is reduced to 720 ℃, adding magnesium accounting for 2.0 wt.% of the mass of the aluminum ingot, and after 10min, adding C accounting for 1 wt.% of the mass of the pure aluminum again after the magnesium is melted2Cl6The powder is used for degassing and purifying the composite melt; and skimming the melt.
Step 6: after the slag is removed, the melt is kept stand for 10min and poured into a mold for cooling and solidification to obtain 3.0 wt.% of ZrB2Ceramic particle modified Al-Zn-Mg-Cu aluminum alloy ingot and processing the ingot into a welding rod with required size.
Third, beneficial effect
To verify the weldability of the wire, the wire produced in example 1 was used with 3.0 wt.% ZrB2The Al-Zn-Mg-Cu aluminum alloy welding rod of the ceramic particles performs fusion welding and detection on 7055 aluminum alloy, the strength of a welding joint is 284MPa, and T76 heat treatment is performed on the welding joint, and the strength of the welding joint is 486 MPa.
Those skilled in the art will appreciate that the above embodiments are merely exemplary embodiments and that various changes, substitutions, and alterations can be made without departing from the spirit and scope of the invention.
Claims (8)
1. ZrB2The ceramic particle modified Al-Zn-Mg-Cu aluminum alloy welding rod is characterized by comprising the following components in percentage by mass: 4.0-6.7 wt.% Zn, 1.6-2.0 wt.% Mg, 0.5-2.0 wt.% Cu, 0.5-5.0 wt.% ZrB2The balance of Al, the total mass percent content is 100%; wherein, said ZrB2From K2ZrF6Powder and KBF4The powder is prepared by the in-situ reaction according to the mass ratio of 1 (1.13-1.25).
2. A ZrB according to claim 12The Al-Zn-Mg-Cu aluminum alloy welding rod modified by ceramic particles is characterized in that Al has purity>99% pure aluminium.
3. A ZrB according to claim 12The Al-Zn-Mg-Cu aluminum alloy welding rod modified by ceramic particles is characterized in that Mg has purity>99% pure magnesium.
4. A ZrB according to claim 12The Al-Zn-Mg-Cu aluminum alloy welding rod modified by ceramic particles is characterized in that Zn has purity>99% pure zinc.
5. A ZrB according to claim 12The Al-Zn-Mg-Cu aluminum alloy welding rod modified by ceramic particles is characterized in that the Cu has purity>99% pure copper.
6. A ZrB according to claim 12The Al-Zn-Mg-Cu aluminum alloy welding rod modified by ceramic particles is characterized in that K is2ZrF6Purity of (2)>98％。
7. A ZrB according to claim 12The Al-Zn-Mg-Cu aluminum alloy welding rod modified by ceramic particles is characterized in that the KBF is4Purity of (2)>98％。
8. A ZrB according to any one of claims 1-72The preparation method of the ceramic particle modified Al-Zn-Mg-Cu aluminum alloy welding rod is characterized by comprising the following steps of:
(1) putting Al in a graphite crucible in a resistance furnace, heating to 780-830 ℃, and completely melting;
(2) mixing KBF4And K2ZrF6Adding inorganic salt powder with the mass ratio of 1 (1.13-1.25) into the molten aluminum prepared in the step 1, and carrying out in-situ reaction to generate ZrB2Particle, wherein an electromagnetic stirrer is opened in the reaction process, and the electromagnetic frequency is 10 HZ;
(3) after the in-situ reaction is carried out for 20-30 min, C accounting for 1 wt.% of the mass of the Al is added2Cl6The powder is used for degassing and purification; and slagging off the melt;
(4) after slagging off, when the temperature of the melt is reduced to 740-760 ℃, adding Cu accounting for 0.8 wt.% of the mass of the Al and Zn accounting for 4.5 wt.% of the mass of the Al; after 10min, after Cu and Zn are completely dissolved, C accounting for 1 wt.% of the mass of the Al is added again2Cl6The powder is used for degassing and purifying the composite melt; and slagging off the melt;
(5) after slagging off, when the temperature of the melt is reduced to 700-720 ℃, adding Mg accounting for 1.6 wt.% of the mass of the Al, and after 10min, adding C accounting for 1 wt.% of the mass of the Al again after the Mg is melted2Cl6The powder is used for degassing and purifying the composite melt; and slagging off the melt;
(6) and after slagging off, standing the melt for 10min, pouring the melt into a mold for cooling and solidification to obtain an Al-Zn-Mg-Cu aluminum alloy cast ingot modified by 0.5-5.0 wt.% of ZrB2 ceramic particles, and processing the cast ingot into a welding rod with a required size.
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