A high entropy alloy reinforced aluminum-lithium alloy wire and preparation method thereof

Abstract

The present invention provides a high entropy alloy reinforced aluminum-lithium alloy wire and a preparation method thereof, the preparation method comprising: 1) adopting step-by-step ball milling and smelting of AlTiMgLiV light high entropy alloy to obtain AlTiMgLiV light high entropy alloy particle reinforcement; 2) adopting a continuous casting and extrusion process to obtain AlTiMgLiV high entropy alloy particle reinforced aluminum-lithium alloy wire; 3) annealing the wire and straightening it; 4) stress relief annealing the wire to obtain a high entropy alloy reinforced aluminum-lithium alloy wire. Based on the good interface bonding characteristics of the high entropy alloy reinforcement and the aluminum-lithium alloy, the present invention adopts a continuous casting and extrusion process to improve the yield rate of the high entropy alloy reinforced aluminum-lithium alloy wire, avoids the problem of directly drawing the aluminum-lithium alloy and causing fracture due to low elongation, and finally obtains a high entropy alloy reinforced aluminum-lithium alloy wire dedicated to lightweight aluminum-lithium alloy additive manufacturing, the tensile strength of which is greater than 897MPa, and the elongation at break is more than 15%.

Description

Technical Field

[0001] The present invention belongs to the field of metal-based composite materials and additive manufacturing, and in particular relates to a high-entropy alloy reinforced aluminum-lithium alloy wire and a preparation method thereof. Background Art

[0002] Compared with conventional aluminum alloys, aluminum-lithium alloys reduce the weight of structures by 10% to 20% and increase the stiffness by about 20%. They have a series of advantages such as low density, high elastic modulus, high specific strength and high specific stiffness, which meet the weight reduction needs of weapons and equipment in the aerospace field and have broad application prospects in the aerospace field. However, aluminum-lithium alloys generally have disadvantages such as anisotropy. Particle-reinforced aluminum-based composites can strengthen aluminum alloys and become the research focus of aluminum-based composites.

[0003] At present, the reinforcements used in aluminum-based composite materials mainly include silicon carbide particles, boron nitride particles, etc. Most of them are non-metallic ceramic particles, which are difficult to form a stable and effective metallurgical interface with the aluminum alloy matrix. With the rapid development of additive manufacturing technology, the additive manufacturing technology of arc + wire fused deposition forming is increasingly used in aviation components. Arc + wire additive manufacturing can achieve efficient and near-net forming of metal parts. It does not require mold investment in the early stage, can break through the size specification restrictions, and prepare small batches of components with complex geometric shapes. It has the advantages of high material utilization, short preparation cycle, and rapid response. However, there is a shortage of particle-reinforced aluminum-lithium alloy wires specially used for additive manufacturing. Summary of the invention

[0004] In view of the difficulty in forming a stable and effective metallurgical interface between a ceramic particle reinforcement and an aluminum-lithium alloy matrix, and the shortage of particle-reinforced aluminum-lithium alloy wires specially used for additive manufacturing, the present invention provides a high-entropy alloy reinforced aluminum-lithium alloy wire and a preparation method thereof. The preparation method of the high-entropy alloy particle-reinforced aluminum-lithium alloy wire is simple, the wire has high tensile strength and elongation, and is suitable for large-scale industrial production.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] The present invention provides a method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire, the method comprising the following steps:

[0007] 1) High-purity Al, Ti, V, Mg, and Li single-substance powders are configured according to a molar ratio of 1:1:1:(1-x):x, where x=0.1-0.5; Ti and V are firstly ball-milled at room temperature for 24 hours to prepare Ti and V mixed powders, and then Al, Mg, and Li are ball-milled at low temperature for 24 hours to obtain AlTiMgLiV high-entropy alloy molten metal by step-by-step vacuum melting, and then the AlTiMgLiV high-entropy alloy molten metal is sprayed and atomized to obtain AlTiMgLiV high-entropy alloy particles;

[0008] 2) melting the aluminum-lithium alloy ingot in a high-frequency induction heating furnace, adding a refining agent, and then adding AlTiMgLiV high entropy alloy particles and continuously stirring to obtain a suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy;

[0009] 3) pouring the uniformly mixed alloy suspension into the mold cavity of the casting extruder, and extruding the alloy out of the die hole by rotating the casting extrusion wheel to obtain AlTiMgLiV high entropy alloy particle reinforced aluminum-lithium alloy wire;

[0010] 4) After annealing the wire, straighten it through a drawing die;

[0011] 5) The wire is subjected to stress relief annealing to obtain a high entropy alloy reinforced aluminum-lithium alloy wire.

[0012] Preferably, the purity of the Al, Ti, V, Mg and Li single powders in step 1) is 99.99%.

[0013] Preferably, in step 1), the ball milling speed of the high-speed room temperature ball milling is 1400-1600 rpm, the ball-to-material ratio is 3:3-3:1, the low-temperature ball milling medium is liquid nitrogen, the low temperature is -80°C to -196°C, the ball milling speed is 400-600 rpm, the ball-to-material ratio is 3:3-3:1, and the ball milling abrasive is Φ5 mm corundum.

[0014] Preferably, the step-by-step vacuum melting in step 1) comprises: firstly fully melting and alloying the Ti and V mixed powders at a temperature of 1400-1500°C, and then adding the Al, Mg and Li mixed powders at a temperature of 1000-1200°C, and obtaining the AlTiMgLiV high entropy alloy molten metal after Al, Ti, V, Mg and Li are completely alloyed.

[0015] Preferably, in step 1), the spraying atomizing gas is argon, the gas pressure is 0.8-1.2 MPa, the deposition distance is 80-100 cm, and the AlTiMgLiV high entropy alloy particles are spherical in shape with a particle size of 80-120 μm.

[0016] Preferably, the aluminum-lithium alloy ingot grade described in step 2) is 2195, the refining agent is aluminum-zirconium alloy, the melting temperature is 750-850°C, the stirring method is magnetic stirring, and the mass percentage of AlTiMgLiV high entropy alloy particles in the suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy is 10-35%.

[0017] Preferably, the pouring temperature in step 3) is 750-850°C, the cooling water flow rate is 12-18 L / min, the casting wheel speed is 8-12 r / min, and the casting die hole diameter is Φ1.8±0.1 mm.

[0018] Preferably, the annealing temperature in step 4) is 400-450° C., and the diameter of the die hole of the drawing die is Φ1.8±0.05 mm.

[0019] Preferably, the stress relief annealing temperature in step 5) is 300-400° C., and the holding time is 24 hours.

[0020] The present invention also provides a high entropy alloy reinforced aluminum-lithium alloy wire, which is prepared by the above preparation method.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention uses AlTiMgLiV lightweight high entropy alloy particles as reinforcement. On the one hand, the reinforcement will not significantly increase the density of the aluminum-lithium alloy matrix, ensuring the lightweight of the composite material; on the other hand, the reinforcement has good wettability with the aluminum-lithium matrix, and the interface bonding strength between the reinforcement and the aluminum-lithium matrix is ​​high after alloying, solving the problem of poor interface bonding between existing ceramic particle reinforcements and the matrix.

[0023] (2) The present invention adopts step-by-step ball milling and smelting of AlTiMgLiV lightweight high entropy alloy, which solves the problem of easy combustion, oxidation and volatilization of Mg and Li in the smelting process.

[0024] (3) The present invention adopts a continuous casting and extrusion process to form the wire, which solves the problem of difficulty in forming the aluminum-lithium alloy wire, improves the yield rate of high-entropy alloy reinforced aluminum-lithium alloy wire, and avoids the problem of direct drawing of aluminum-lithium alloy resulting in breakage due to low elongation.

[0025] (4) The high-entropy alloy reinforced aluminum-lithium alloy wire prepared by the present invention utilizes the characteristics of AlTiMgLiV high-entropy alloy reinforcement body strength, plasticity and toughness to solve the problem of low comprehensive mechanical properties of aluminum-lithium alloy wire, and finally obtains high-entropy alloy reinforced aluminum-lithium alloy wire specially used for lightweight aluminum-lithium alloy additive manufacturing, whose tensile strength is greater than 897MPa and elongation at break is greater than 15%. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a physical picture of the high entropy alloy reinforced aluminum-lithium alloy wire prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the present invention, "room temperature" may be 25°C±5°C.

[0029] Example 1

[0030] The present embodiment provides a method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire, comprising the following steps:

[0031] 1) Al, Ti, V, Mg, and Li single powders with a purity of 99.99% are configured in a molar ratio of 1:1:1:0.9:0.1, and Φ5 mm corundum is used as a ball milling abrasive. Ti and V are first ball milled at 1600 rpm for 24 hours at room temperature to prepare Ti and V mixed powders, and the ball-to-material ratio is 3:3. Al, Mg, and Li are then ball milled in liquid nitrogen at -80°C and 400 rpm for 24 hours, and the ball-to-material ratio is 3:3. The Ti and V mixed powders are first fully melted and alloyed at 1400°C, and then Al, Mg, and Li mixed powders are added at 1000°C. After Al, Ti, V, Mg, and Li are completely alloyed, they are spray-atomized and deposited under argon atmosphere protection, with a gas pressure of 0.8 MPa and a deposition distance of 80 cm to obtain spherical AlTiMgLiV high entropy alloy particles with a particle size of about Φ35 to 85 μm;

[0032] 2) melting the 2195 aluminum-lithium alloy ingot in a high-frequency induction heating furnace, adding a refining agent aluminum-zirconium alloy, the melting temperature is 750° C., and then adding 10% of AlTiMgLiV high entropy alloy particles and continuously magnetically stirring to obtain a suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy;

[0033] 3) pouring the uniformly mixed alloy suspension into the mold cavity of the casting extruder, the pouring temperature is 750° C., the cooling water flow rate is set to 12 L / min, the casting extrusion wheel speed is 8 r / min, and the alloy is extruded through a die hole with a diameter of Φ1.8±0.1 mm by rotating the casting extrusion wheel to obtain an aluminum-lithium alloy wire reinforced with AlTiMgLiV high entropy alloy particles;

[0034] 4) After annealing the wire at 400°C, the wire is straightened by passing through a drawing die with a die hole diameter of Φ1.8±0.05mm;

[0035] 5) The wire is subjected to stress relief annealing at 300°C with a holding time of 24 hours.

[0036] The high entropy alloy reinforced aluminum-lithium alloy wire prepared in this embodiment is as follows Figure 1 The high entropy alloy reinforced aluminum-lithium alloy wire prepared in this embodiment was tested according to GB / T 10573-1989 non-ferrous metal filament tensile test method and the measured tensile strength and elongation are listed in Table 1.

[0037] Example 2

[0038] The present embodiment provides a method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire, comprising the following steps:

[0039] 1) Al, Ti, V, Mg, and Li single powders with a purity of 99.99% are configured in a molar ratio of 1:1:1:0.7:0.3, and Φ5 mm corundum is used as a ball milling abrasive. Ti and V are first ball milled at 1400 rpm for 24 hours at room temperature to prepare Ti and V mixed powders, and the ball-to-material ratio is 3:2. Al, Mg, and Li are then ball milled in liquid nitrogen at -196°C and 600 rpm for 24 hours, and the ball-to-material ratio is 3:2. The Ti and V mixed powders are first fully melted and alloyed at 1500°C, and then Al, Mg, and Li mixed powders are added at 1200°C. After Al, Ti, V, Mg, and Li are completely alloyed, they are spray-atomized and deposited under argon atmosphere protection, with a gas pressure of 1.0 MPa and a deposition distance of 90 cm to obtain spherical AlTiMgLiV high entropy alloy particles with a particle size of about Φ35 to 85 μm;

[0040] 2) melting the 2195 aluminum-lithium alloy ingot in a high-frequency induction heating furnace, adding a refining agent aluminum-zirconium alloy, the melting temperature is 800° C., and then adding 20% ​​of AlTiMgLiV high entropy alloy particles and continuously magnetically stirring to obtain a suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy;

[0041] 3) pouring the uniformly mixed alloy suspension into the mold cavity of the casting extruder, the pouring temperature is 850° C., the cooling water flow rate is set to 15 L / min, the casting extrusion wheel speed is 10 r / min, and the alloy is extruded into a die hole with a diameter of Φ1.8±0.1 mm by rotating the casting extrusion wheel to obtain AlTiMgLiV high entropy alloy particle reinforced aluminum-lithium alloy wire;

[0042] 4) After annealing the wire at 450°C, the wire is straightened by passing through a drawing die with a die hole diameter of Φ1.8±0.05mm;

[0043] 5) The wire is subjected to stress relief annealing at 350°C with a holding time of 24 hours.

[0044] The high entropy alloy reinforced aluminum-lithium alloy wire prepared in this example was tested and the measured tensile strength and elongation are listed in Table 1.

[0045] Example 3

[0046] The present embodiment provides a method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire, comprising the following steps:

[0047] 1) Al, Ti, V, Mg, and Li single-substance powders with a purity of 99.99% are configured in a molar ratio of 1:1:1:0.5:0.5, and Φ5 mm corundum is used as a ball milling abrasive. Ti and V are first ball milled at room temperature at 1600 rpm for 24 hours to prepare Ti and V mixed powders, and the ball-to-material ratio is 3:3. Al, Mg, and Li are then ball milled in liquid nitrogen at -80°C and 600 rpm for 24 hours, and the ball-to-material ratio is 3:3. The Ti and V mixed powders are first fully melted and alloyed at 1500°C, and then Al, Mg, and Li mixed powders are added at 1200°C. After Al, Ti, V, Mg, and Li are completely alloyed, they are spray-atomized and deposited under argon atmosphere protection, with a gas pressure of 1.2 MPa and a deposition distance of 100 cm to obtain spherical AlTiMgLiV high entropy alloy particles with a particle size of about Φ35 to 85 μm;

[0048] 2) melting the 2195 aluminum-lithium alloy ingot in a high-frequency induction heating furnace, adding a refining agent aluminum-zirconium alloy, the melting temperature is 850° C., and then adding 30% of AlTiMgLiV high entropy alloy particles and continuously magnetically stirring to obtain a suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy;

[0049] 3) pouring the uniformly mixed alloy suspension into the mold cavity of the casting extruder, the pouring temperature is 800° C., the cooling water flow rate is set to 18 L / min, the casting extrusion wheel speed is 12 r / min, and the alloy is extruded through a die hole with a diameter of Φ1.8±0.1 mm by rotating the casting extrusion wheel to obtain an aluminum-lithium alloy wire reinforced with AlTiMgLiV high entropy alloy particles;

[0050] 4) After annealing the wire at 450°C, the wire is straightened by passing through a drawing die with a die hole diameter of Φ1.8±0.05mm;

[0051] 5) The wire is subjected to stress relief annealing at 400°C with a holding time of 24 hours.

[0052] The high entropy alloy reinforced aluminum-lithium alloy wire prepared in this example was tested and the measured tensile strength and elongation are listed in Table 1.

[0053] Example 4

[0054] The present embodiment provides a method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire, comprising the following steps:

[0055] 1) Al, Ti, V, Mg, and Li single-substance powders with a purity of 99.99% are configured in a molar ratio of 1:1:1:0.5:0.5, and Φ5 mm corundum is used as a ball milling abrasive. Ti and V are first ball milled at room temperature at 1500 rpm for 24 hours to prepare Ti and V mixed powders, and the ball-to-material ratio is 3:1. Al, Mg, and Li are then ball milled in liquid nitrogen at -196°C and 500 rpm for 24 hours, and the ball-to-material ratio is 3:1. After the Ti and V mixed powders are fully melted and alloyed at 1450°C, Al, Mg, and Li mixed powders are added at 1100°C. After Al, Ti, V, Mg, and Li are completely alloyed, they are spray-atomized and deposited under argon atmosphere protection, with a gas pressure of 1.2 MPa and a deposition distance of 100 cm to obtain spherical AlTiMgLiV high entropy alloy particles with a particle size of about Φ35 to 85 μm;

[0056] 2) melting the 2195 aluminum-lithium alloy ingot in a high-frequency induction heating furnace, adding a refining agent aluminum-zirconium alloy, the melting temperature is 750° C., and then adding 35% of AlTiMgLiV high entropy alloy particles and continuously magnetically stirring to obtain a suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy;

[0057] 3) pouring the uniformly mixed alloy suspension into the mold cavity of the casting extruder, the pouring temperature is 800° C., the cooling water flow rate is set to 18 L / min, the casting extrusion wheel speed is 12 r / min, and the alloy is extruded through a die hole with a diameter of Φ1.8±0.1 mm by rotating the casting extrusion wheel to obtain AlTiMgLiV high entropy alloy particle reinforced aluminum-lithium alloy wire;

[0058] 4) After annealing the wire at 430°C, the wire is straightened by passing through a drawing die with a die hole diameter of Φ1.8±0.05mm;

[0059] 5) The wire is subjected to stress relief annealing at 400°C with a holding time of 24 hours.

[0060] The high entropy alloy reinforced aluminum-lithium alloy wire prepared in this example was tested and the measured tensile strength and elongation are listed in Table 1.

[0061] Comparative Example 1

[0062] This comparative example provides a method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire, comprising the following steps:

[0063] 1) Al, Ti, V, Mg, and Li single-substance powders with a purity of 99.99% are configured in a molar ratio of 1:1:1:0.4:0.6, and Φ5 mm corundum is used as a ball milling abrasive. Ti and V are first ball milled at 1300 rpm for 24 hours at room temperature to prepare Ti and V mixed powders, and the ball-to-material ratio is 3:1. Al, Mg, and Li are then ball milled in liquid nitrogen at -80°C and 300 rpm for 24 hours, and the ball-to-material ratio is 3:1. The Ti and V mixed powders are first fully melted and alloyed at 1600°C, and then Al, Mg, and Li mixed powders are added at 1300°C. After Al, Ti, V, Mg, and Li are completely alloyed, they are spray-atomized and deposited under argon atmosphere protection, with a gas pressure of 1.3 MPa and a deposition distance of 120 cm to obtain spherical AlTiMgLiV high entropy alloy particles with a particle size of about Φ100 to 300 μm;

[0064] 2) melting the 2195 aluminum-lithium alloy ingot in a high-frequency induction heating furnace, adding a refining agent aluminum-zirconium alloy, the melting temperature is 850° C., and then adding 40% of AlTiMgLiV high entropy alloy particles and continuously magnetically stirring to obtain a suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy;

[0065] 3) pouring the uniformly mixed alloy suspension into the mold cavity of the casting extruder, the pouring temperature is 800° C., the cooling water flow rate is set to 18 L / min, the casting extrusion wheel speed is 12 r / min, and the alloy is extruded through a die hole with a diameter of Φ1.8±0.1 mm by rotating the casting extrusion wheel to obtain an aluminum-lithium alloy wire reinforced with AlTiMgLiV high entropy alloy particles;

[0066] 4) After annealing the wire at 450°C, the wire is straightened by passing through a drawing die with a die hole diameter of Φ1.8±0.05mm;

[0067] 5) The wire is subjected to stress relief annealing at 400°C with a holding time of 24 hours.

[0068] The high entropy alloy reinforced aluminum-lithium alloy wire prepared in this comparative example was tested and the measured tensile strength and elongation are listed in Table 1.

[0069] Comparative Example 2

[0070] This comparative example provides a method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire, comprising the following steps:

[0071] 1) Al, Ti, V, Mg, and Li single-substance powders with a purity of 99.99% are configured in a molar ratio of 1:1:1:0.95:0.05, and Φ5 mm corundum is used as a ball milling abrasive. Ti and V are first ball milled at 1700 rpm for 24 hours at room temperature to prepare Ti and V mixed powders, and the ball-to-material ratio is 3:1. Al, Mg, and Li are ball milled in liquid nitrogen at -80°C and 700 rpm for 24 hours, and the ball-to-material ratio is 3:1. The Ti and V mixed powders are first fully melted and alloyed at 1300°C, and then Al, Mg, and Li mixed powders are added at 900°C. After Al, Ti, V, Mg, and Li are completely alloyed, they are spray-atomized and deposited under argon atmosphere protection, with a gas pressure of 0.7 MPa and a deposition distance of 70 cm to obtain non-spherical AlTiMgLiV high entropy alloy particles with a particle size of 75 to 100 μm;

[0072] 2) melting the 2195 aluminum-lithium alloy ingot in a high-frequency induction heating furnace, adding a refining agent aluminum-zirconium alloy, the melting temperature is 750° C., and then adding 8% of AlTiMgLiV high entropy alloy particles and continuously stirring with magnetic stirring to obtain a suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy;

[0073] 3) pouring the uniformly mixed alloy suspension into the mold cavity of the casting extruder, the pouring temperature is 900° C., the cooling water flow rate is set to 20 L / min, the casting extrusion wheel speed is 14 r / min, and the alloy is extruded through a die hole with a diameter of Φ1.8±0.1 mm by rotating the casting extrusion wheel to obtain an aluminum-lithium alloy wire reinforced with AlTiMgLiV high entropy alloy particles;

[0074] 4) After annealing the wire at 500°C, the wire is straightened by passing through a drawing die with a die hole diameter of Φ1.8±0.05mm;

[0075] 5) The wire is subjected to stress relief annealing at 450°C with a holding time of 24 hours.

[0076] The high entropy alloy reinforced aluminum-lithium alloy wire prepared in this comparative example was tested and the measured tensile strength and elongation are listed in Table 1.

[0077] Comparative Example 3

[0078] A method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire comprises the following steps:

[0079] 1) Al, Ti, V, Mg, and Li single-substance powders with a purity of 99.99% are configured in a molar ratio of 1:1:1:0.95:0.05, and Φ5 mm corundum is used as a ball milling abrasive. Ti and V are first ball milled at 1700 rpm for 24 hours at room temperature to prepare Ti and V mixed powders, and the ball-to-material ratio is 3:3. Al, Mg, and Li are then ball milled in liquid nitrogen at -80°C and 700 rpm for 24 hours, and the ball-to-material ratio is 3:3. The Ti and V mixed powders are first fully melted and alloyed at 1300°C, and then Al, Mg, and Li mixed powders are added at 900°C. After Al, Ti, V, Mg, and Li are completely alloyed, they are spray-atomized and deposited under argon atmosphere protection, with a gas pressure of 0.7 MPa and a deposition distance of 70 cm to obtain non-spherical AlTiMgLiV high entropy alloy particles with a particle size of 75 to 100 μm;

[0080] 2) melting the 2195 aluminum-lithium alloy ingot in a high-frequency induction heating furnace, adding a refining agent aluminum-zirconium alloy, the melting temperature is 750° C., and then adding 8% of AlTiMgLiV high entropy alloy particles and continuously stirring with magnetic stirring to obtain a suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy;

[0081] 3) pouring the uniformly mixed alloy suspension into the mold cavity of the casting extruder, the pouring temperature is 900° C., the cooling water flow rate is set to 10 L / min, the casting extrusion wheel speed is 6 r / min, and the alloy is extruded through a die hole with a diameter of Φ1.8±0.1 mm by rotating the casting extrusion wheel to obtain an aluminum-lithium alloy wire reinforced with AlTiMgLiV high entropy alloy particles;

[0082] 4) After annealing the wire at 350°C, the wire is straightened by passing through a drawing die with a die hole diameter of Φ1.8±0.05mm;

[0083] 5) The wire is subjected to stress relief annealing at 250°C with a holding time of 24 hours.

[0084] The high entropy alloy reinforced aluminum-lithium alloy wire prepared in this comparative example was tested and the measured tensile strength and elongation are listed in Table 1.

[0085] The 2195 aluminum-lithium alloy wire specially used for additive manufacturing needs to meet higher quality requirements. The dimensional accuracy should be controlled within -0.01~0mm, the surface should be bright and scratch-free, the surface oil content should not be higher than 0.2mg / L, the relaxation diameter should be controlled within 500~600mm, and the warpage should not exceed 25mm.

[0086] Table 1: Properties of high entropy alloy reinforced aluminum-lithium alloy wires in the embodiments of the present invention and the comparative examples

[0087]

[0088]

[0089] It can be seen from the above embodiments and comparative examples that the high entropy alloy reinforced aluminum-lithium alloy provided by the present invention is used as a special wire for additive manufacturing, and no cracks are generated on its surface, and it has good mechanical properties, and its tensile strength can reach up to 897MPa, and its elongation after fracture is more than 15%.

[0090] The above are preferred embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire, the method comprising the following steps: 1) High-purity Al, Ti, V, Mg, and Li single-substance powders are configured according to a molar ratio of 1:1:1:(1-x):x, where x=0.1-0.5; Ti and V are firstly ball-milled at room temperature for 24 hours to prepare Ti and V mixed powders; Al, Mg, and Li are then ball-milled at low temperature for 24 hours; AlTiMgLiV high-entropy alloy molten metal is obtained by step-by-step vacuum melting; and the AlTiMgLiV high-entropy alloy molten metal is then spray-atomized and deposited to obtain AlTiMgLiV high-entropy alloy particles; 2) After melting the aluminum-lithium alloy ingot in a high-frequency induction heating furnace, a refining agent is added, and then AlTiMgLiV high entropy alloy particles are added and continuously stirred to obtain a suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy, wherein the mass percentage of AlTiMgLiV high entropy alloy particles in the suspension of AlTiMgLiV high entropy alloy particles and aluminum-lithium alloy is 10-35%; 3) pouring the uniformly mixed alloy suspension into the mold cavity of the casting extruder, and extruding the alloy out of the die hole by rotating the casting extrusion wheel to obtain AlTiMgLiV high entropy alloy particle reinforced aluminum-lithium alloy wire; 4) After annealing the wire, straighten it through a drawing die; 5) The wire is subjected to stress relief annealing to obtain high entropy alloy reinforced aluminum-lithium alloy wire.

2. The method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire according to claim 1, characterized in that: The purity of the Al, Ti, V, Mg and Li single powders described in step 1) is 99.99%.

3. The method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire according to claim 1, characterized in that: Step 1) The ball milling speed of the medium- and high-speed room-temperature ball milling is 1400-1600 rpm, the ball-to-material ratio is 3:3-3:1, the cryogenic ball milling medium is liquid nitrogen, the cryogenic temperature is -80°C--196°C, the ball milling speed is 400-600 rpm, the ball-to-material ratio is 3:3-3:1, and the ball milling abrasive is Φ5 mm corundum.

4. The method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire according to claim 1, characterized in that: The stepwise vacuum melting described in step 1) includes: firstly fully melting and alloying Ti and V mixed powders at a temperature of 1400-1500°C, and then adding Al, Mg, and Li mixed powders at a temperature of 1000-1200°C, and obtaining AlTiMgLiV high entropy alloy molten metal after Al, Ti, V, Mg, and Li are completely alloyed.

5. The method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire according to claim 1, characterized in that: In step 1), the spraying atomizing gas is argon, the gas pressure is 0.8-1.2 MPa, the deposition distance is 80-100 cm, and the AlTiMgLiV high entropy alloy particles are spherical in shape with a particle size of 80-120 µm.

6. The method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire according to claim 1, characterized in that: The aluminum-lithium alloy ingot in step 2) is of grade 2195, the refining agent is aluminum-zirconium alloy, the melting temperature is 750-850° C., and the stirring method is magnetic stirring.

7. The method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire according to claim 1, characterized in that: The pouring temperature described in step 3) is 750~850℃, the cooling water flow rate is 12~18 L / min, the casting wheel speed is 8~12 r / min, and the casting die hole diameter is Φ1.8±0.1 mm.

8. The method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire according to claim 1, characterized in that: The annealing temperature described in step 4) is 400-450°C, and the die hole diameter of the drawing die is Φ1.8±0.05 mm.

9. The method for preparing a high entropy alloy reinforced aluminum-lithium alloy wire according to claim 1, characterized in that: The stress relief annealing temperature in step 5) is 300-400°C, and the holding time is 24 h.

10. A high entropy alloy reinforced aluminum-lithium alloy wire, prepared by the preparation method of a high entropy alloy reinforced aluminum-lithium alloy wire according to any one of claims 1 to 9.

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