A high-entropy alloy consumable electrode rod and a method of making and joining the same

Abstract

The application discloses the technical field of high-entropy alloy preparation and relates to a high-entropy alloy consumable electrode rod, which comprises titanium 35-55 at%, aluminum 25-45 at% and vanadium 15-35 at%, and the rest is inevitable impurity elements, and the oxygen content is less than or equal to 1500 ppm. When the high-entropy alloy consumable electrode rod is prepared, the following steps are included: step 1, preparing raw materials according to the raw material proportion of the high-entropy alloy consumable electrode rod; and step 2, filling the raw materials into a mold and pressing the raw materials into the high-entropy alloy consumable electrode rod. The elongation of the high-entropy alloy consumable electrode rod prepared by the application is obviously improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-entropy alloy preparation, and particularly relates to a Ti-Al-V high-entropy alloy consumable electrode rod and a preparation and connecting method thereof. BACKGROUND

[0002] High-entropy alloy is a new alloy system developed since the 21st century. It breaks the alloy design idea of adding other trace elements to a main alloy element in traditional alloy, and combines several elements according to equal atomic ratio or near equal atomic ratio. The organization and performance of the high-entropy alloy are different from those of the traditional alloy in many aspects. The high-entropy alloy has excellent mechanical properties, friction and wear properties, corrosion resistance, high-temperature resistance and the like, and becomes one of the new materials with the most development potential in the future. Ti-Al alloy (mainly Ti-Al intermetallic compound) is an excellent high-temperature lightweight alloy structural material, and has wide application and development prospect in the fields of aerospace, weapon equipment manufacturing and the like. However, the room temperature plasticity and processing performance of the alloy are poor, and the elongation is generally less than 1%, which seriously limits the process of engineering application. SUMMARY

[0003] The application aims to provide a high-entropy alloy consumable electrode rod to improve the elongation of the high-entropy alloy.

[0004] The high-entropy alloy consumable electrode rod in the application includes titanium 35-55 at%, aluminum 25-45 at% and vanadium 15-35 at%, and the rest is inevitable impurity elements, and the oxygen content is less than or equal to 1500 ppm.

[0005] The application has the beneficial effect that the addition of vanadium elements and the adjustment of the ratio of titanium elements and aluminum elements increase the elongation of the prepared high-entropy alloy consumable electrode rod to 3-5%.

[0006] Based on the high-entropy alloy consumable electrode rod, the application further provides a preparation method of the high-entropy alloy consumable electrode rod, which includes the following steps.

[0007] Step 1: preparing raw materials according to the raw material ratio of the high-entropy alloy consumable electrode rod;

[0008] Step 2: filling the raw materials into a mold and pressing into a high-entropy alloy consumable electrode rod.

[0009] Further, in the raw materials, the titanium is added in the form of pure titanium, the vanadium is added in the form of AlV85 intermediate alloy, and the aluminum is added in the form of pure aluminum and AlV85 intermediate alloy.

[0010] Further, in the raw materials, the titanium is selected from sponge titanium, the vanadium is selected from fine-grained AlV85 intermediate alloy, and the aluminum is selected from pure aluminum beans, aluminum foil and fine-grained AlV85 intermediate alloy.

[0011] Further, the application provides a preparation method of the high-entropy alloy consumable electrode rod, comprising the following steps:

[0012] Step 1, preparation of raw materials: prepare raw materials according to the proportion of the high-entropy alloy consumable electrode rod, wherein titanium is selected from sponge titanium, vanadium is selected from AlV85 intermediate alloy with fine particles, and aluminum is selected from pure aluminum beans, aluminum foil and AlV85 intermediate alloy with fine particles;

[0013] Step 2, loading of raw materials: wrap the AlV85 fine particles prepared in step 1 into an intermediate package in the form of a long strip with aluminum foil; load the mixed and evenly distributed pure aluminum beans and sponge titanium on the lower surface of the inner cavity of the pressing mold, place the intermediate package in the middle of the pressing mold, and then evenly load the remaining pure aluminum beans and sponge titanium around the intermediate package and on the upper surface;

[0014] Step 3, pressing of the electrode rod: load according to the loading sequence of step 2, then cover the upper pressing plate, and press the high-entropy alloy consumable electrode rod under a pressure of 180-250 tons.

[0015] The high-entropy alloy consumable electrode rod is pressed under a pressure of 180-250 tons, which on the one hand ensures the tightness of the high-entropy alloy consumable electrode rod pressing, avoids the problem of easy slagging during the self-consumption (if the high-entropy alloy consumable electrode rod is not pressed tightly, it may be directly broken in the middle in severe cases), and avoids the occurrence of safety accidents and damage to the self-consumption smelting equipment; on the other hand, it avoids increasing the weight of the mold, saves costs, and is more convenient to carry and disassemble.

[0016] Based on the high-entropy alloy consumable electrode rod prepared above, the application further provides a connecting method of the high-entropy alloy consumable electrode rod, comprising the following steps:

[0017] Step 1, preparation of aluminum liquid: melt the pure aluminum block into aluminum liquid;

[0018] Step 2, preparation of electrode rod: butt joint multiple high-entropy alloy consumable electrode rods together, wrap the bottom and side of the high-entropy alloy consumable electrode rod with an aluminum plate with a thickness of 0.6-1 mm, and leave a gap between the adjacent two high-entropy alloy consumable electrode rods;

[0019] Step 3, connection of electrode rod: add aluminum liquid into the aluminum plate until the aluminum liquid completely solidifies, realizing the connection of the high-entropy alloy consumable electrode rod.

[0020] The traditional welding method can only connect the periphery of the electrode rod, but cannot connect the inside, so that the side edge arcing and electrode rod falling off phenomenon easily occur in the vacuum self-consumption smelting process, causing safety accidents. In the present application, the all-around connection of the electrode rod is carried out by using the solidification process of the aluminum liquid, which can avoid the above problems and has important progress significance. Specifically, (1) the self-consumption electrode rod is connected by the way of molten raw material, which reduces the pollution of welding wire to the alloy composition during welding; (2) the electrode rod is connected by using pure aluminum liquid from liquid to solid, which avoids the hollow phenomenon in the middle position of the electrode rod connected by welding method, and the sudden fracture caused by loose connection during smelting process; (3) the connection surface is smooth without protrusion, which reduces the side edge arcing phenomenon caused by welding scar and other protrusions.

[0021] Further, when the aluminum plate wraps the bottom and side surface of the high-entropy alloy self-consumption electrode rod, the aluminum plate is tightly combined with the high-entropy alloy self-consumption electrode rod. The tight combination of the aluminum plate and the high-entropy alloy self-consumption electrode rod can effectively prevent the side edge arcing phenomenon of the touch wall during the self-consumption process.

[0022] Further, the gap between the two adjacent high-entropy alloy self-consumption electrode rods is 4-6mm. If the distance between the two adjacent high-entropy alloy self-consumption electrode rods is too large, it is easy to cause composition deviation, and if the distance is too small, the connection is not firm, and it is easy to break and cause danger; the distance of 4-6mm can better achieve balance.

[0023] Further, when the pure aluminum block is melted into the aluminum liquid, the temperature of the aluminum liquid is 680-700℃. If the temperature of the aluminum liquid is too high, the aluminum plate is easy to be burned through, causing the aluminum liquid to flow out and causing the danger of side edge arcing; the aluminum liquid temperature of 680-700℃ can better solve this problem. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The macroscopic morphology graph of the alloy ingot obtained by vacuum self-consumption smelting of the high-entropy alloy self-consumption electrode rod prepared in Example 2;

[0025] Figure 2 The microstructure morphology graph of the alloy ingot. Figure 1 DETAILED DESCRIPTION

[0026] The following will be further described in detail through specific embodiments:

[0027] Example 1

[0028] A high-entropy alloy self-consumption electrode rod, which comprises the following raw materials: titanium 35at%, aluminum 35at%, vanadium 30at%, and the rest is inevitable impurity elements, and the oxygen content is ≤1500ppm. The preparation includes the following steps: ​

[0029] Step 1, raw material ratio: according to the size of the Ti-Al-V high-entropy alloy consumable electrode rod required, 1500g is calculated, the required weight of titanium is 606g, the required weight of vanadium is 552.6g, and the required weight of aluminum is 341.4g;

[0030] Step 2, raw material preparation: titanium in the raw material is added in the form of titanium sponge, the weight of titanium sponge is 606g, vanadium is added in the form of AlV85 intermediate alloy, the weight of AlV85 intermediate alloy is 650g, that is, the weight of aluminum element in AlV85 intermediate alloy is 97.4g; the weight of vanadium element is 552.6g, and the addition of aluminum is in the form of pure aluminum beans and aluminum foil, and the weight of pure aluminum beans and aluminum foil is 244g;

[0031] Step 3, loading of raw materials: the AlV85 fine particles prepared in step 2 are wrapped with thin aluminum foil into a strip-shaped ladle; the pure aluminum beans and titanium sponge are mixed uniformly, a layer of mixed pure aluminum beans and titanium sponge is loaded on the lower surface of the pressing mold, the ladle is placed in the middle of the pressing mold, and the remaining pure aluminum beans and titanium sponge are loaded around the ladle and on the upper surface;

[0032] Step 4, pressing of electrode rod: loading according to the loading sequence in step 3, tightening the 6 fastening bolts of the pressing mold, covering the upper pressing plate; then pressing on the 200-ton hydraulic machine, and repeating the pressing twice to obtain the high-entropy alloy consumable electrode rod.

[0033] Example 2, a connecting method of high-entropy alloy consumable electrode rod, comprising the following steps:

[0034] Step 1, aluminum liquid preparation: put the pure aluminum block into the crucible, put the crucible into the induction furnace for heating, so that the pure aluminum block is melted into aluminum liquid, and the aluminum liquid temperature is tested to be 680℃;

[0035] Step 2, electrode rod preparation: butt joint two high-entropy alloy consumable electrode rods prepared in example 1, reserve a distance of 5mm between the two electrode rods, wrap the bottom and side of the high-entropy alloy consumable electrode rod with a thin aluminum plate with a thickness of 0.8mm, and the thin aluminum plate is in close contact with the electrode rod;

[0036] Step 3, electrode rod connection: the molten aluminum liquid is scooped into the aluminum plate with a zinc oxide coated and baked preheated spoon, and the two sections of electrode rods are connected by using the solidification process of aluminum liquid from liquid to solid, thereby realizing the connection of the high-entropy alloy consumable electrode rod.

[0037] The high-entropy alloy consumable electrode rod connected in example 2 is subjected to three times of vacuum consumable smelting, and the macroscopic morphology diagram of the obtained alloy ingot is shown in Figure 2. Figure 1The microstructure morphology of the alloy ingot is shown in the attached Figure 2 The microstructure morphology of the alloy ingot is shown in the attached Figure 1 The microstructure morphology of the alloy ingot is shown in the attached Figure 2 It can be seen that the surface quality of the alloy ingot is good, the shrinkage cavity is shallow, and there is no visible shrinkage, porosity and other defects in the interior of the ingot.

[0038] The composition and microstructure of the alloy ingot at different positions are tested, the composition fluctuation is within the design allowable range, the deviation of each position is small, and the microstructure is uniform, and the specific parameters are shown in Table 1:

[0039] Table 1 Alloy composition of Ti-Al-V alloy ingot (wt. %)

[0040]

[0041] The above-mentioned is only an embodiment of the present application, and the specific structure and characteristics of the scheme known in the art are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A method of joining high-entropy alloy consumable electrode rods, characterized by: The method comprises the following steps: Step 1, preparation of aluminum liquid: melt pure aluminum blocks into aluminum liquid; Step 2, preparation of electrode rods: butt joint multiple high-entropy alloy consumable electrode rods together, wrap the bottom and side of the high-entropy alloy consumable electrode rods with aluminum plates with a thickness of 0.6-1 mm, and leave a gap between the two adjacent high-entropy alloy consumable electrode rods; the high-entropy alloy consumable electrode rod comprises titanium 35-55 at%, aluminum 25-45 at% and vanadium 15-35 at%, and the rest is inevitable impurity elements, and the oxygen content is ≤1500 ppm; Step 3, connection of electrode rods: add the aluminum liquid into the aluminum plate until the aluminum liquid completely solidifies, and realize the connection of the high-entropy alloy consumable electrode rods.

2. The connecting method of high-entropy alloy consumable electrode rod according to claim 1, characterized in that: When the aluminum plate wraps the bottom and side of the high-entropy alloy consumable electrode rod, the aluminum plate is ensured to be tightly combined with the high-entropy alloy consumable electrode rod.

3. The method of claim 2, wherein the method further comprises: The gap between the two adjacent high-entropy alloy consumable electrode rods is 4-6 mm. ​ 4. The connecting method of high-entropy alloy consumable electrode rod according to claim 3, characterized in that: When the pure aluminum blocks are melted into the aluminum liquid, the temperature of the aluminum liquid is 680-700℃.

5. The method of joining high-entropy alloy consumable electrode rods according to any one of claims 1 to 4, characterized in that: The high-entropy alloy consumable electrode rod is prepared by the following method: Step 1: prepare raw materials according to the raw material ratio of the high-entropy alloy consumable electrode rod; Step 2: fill each raw material into a mold and press into a high-entropy alloy consumable electrode rod.

6. The joining method of high-entropy alloy consumable electrode rods according to claim 5, characterized in that: In the raw materials, titanium is added in the form of pure titanium, vanadium is added in the form of AlV85 intermediate alloy, and aluminum is added in the form of pure aluminum and AlV85 intermediate alloy.

7. The method of joining high-entropy alloy consumable electrode rods according to claim 6, characterized in that: In the raw materials, titanium is selected as sponge titanium, vanadium is selected as AlV85 intermediate alloy with fine particles, and aluminum is selected as pure aluminum beans, aluminum foil and AlV85 intermediate alloy with fine particles.

8. The method of joining high-entropy alloy consumable electrode rods according to claim 7, characterized in that: The method comprises the following steps: Step 1, preparation of raw materials: prepare raw materials according to the ratio of the high-entropy alloy consumable electrode rod, wherein titanium is selected as sponge titanium, vanadium is selected as AlV85 intermediate alloy with fine particles, and aluminum is selected as pure aluminum beans, aluminum foil and AlV85 intermediate alloy with fine particles; Step 2, filling of raw materials: wrap the AlV85 fine particles prepared in step 1 into a long strip-shaped intermediate package with aluminum foil; fill the pure aluminum beans and sponge titanium mixed and evenly on the lower surface of the inner cavity of the pressing mold, place the intermediate package in the pressing mold, and then evenly fill the remaining pure aluminum beans and sponge titanium around the intermediate package and on the upper surface; Step 3, pressing of electrode rods: fill according to the filling sequence of step 2, then cover the upper pressing plate, and press it into a high-entropy alloy consumable electrode rod under a pressure of 180-250 tons.

Images