CN104762568A - Aluminum alloy refiner material and preparation method thereof - Google Patents

Abstract

The invention provides an aluminum alloy refiner. The aluminum alloy refiner is an amorphous alloy and is characterized by comprising the following components in parts by mole: 40-60 parts of Zr, 25-45 parts of Cu, 1-15 parts of Al, 1-10 parts of Pd and 1-10 parts of Nb. The refiner can well refine grains. The mechanical properties of the alloy are enhanced to some extent. The intermediate alloy enhances the strength and plasticity of the alloy. The refined A356 aluminum alloy is very suitable for manufacturing automobile wheels.

Description

A kind of aluminum alloy refiner material and preparation method thereof

technical field

The invention relates to the field of aluminum alloy smelting, in particular to an alloy refiner material for refining aluminum alloy.

Background technique

Aluminum is the most abundant metal element in the earth's crust; aluminum has low density, high plasticity, good ductility, good casting performance, dense oxide film protection on the surface, and good corrosion resistance. Casting aluminum alloy is to add other metal or non-metallic elements on the basis of pure aluminum, which not only maintains the basic properties of pure aluminum, but also makes the aluminum alloy have good comprehensive properties due to the effect of alloying and heat treatment. Aluminum-silicon casting alloys use silicon as the main secondary element, and the amount of Si is generally controlled at 4% to 22%. Al-Si alloys have good casting properties (such as fluidity, shrinkage, thermal cracking resistance, air tightness wait). A356 alloy belongs to the Al-Si series alloy. Because of its excellent comprehensive performance, it is widely used in casting various shell parts, automobile wheels, aircraft pump bodies, aircraft accessories, automobile gearboxes, car floor accessories, etc.

At present, in the international automobile industry, A356 aluminum alloy is often used to cast various wheels. A356 aluminum alloy is an Al-Si-Mg alloy, and its main structure is primary α-Al and eutectic structure (α-Al+eutectic silicon), in which the eutectic silicon presents a coarse acicular shape, and this coarse acicular structure will Severe cleaving of the matrix reduces the mechanical properties of the alloy. Therefore, it is necessary to carry out modification treatment to improve the structure and morphology of the alloy, thereby improving the mechanical properties of the alloy. The present invention is exactly to develop novel modificator. Therefore, there is an urgent need for a refiner that meets the chemical requirements of A356.2 alloy, improves its structure and further improves its mechanical properties, so that it can meet the requirements of wheel production.

Contents of the invention

Therefore, the object of the present invention is to provide a refiner that meets the chemical requirements of A356.2 alloy and improves its structure and further improves its mechanical properties so that it can meet the requirements of wheel production.

In order to realize above object of the invention, the present invention provides following technical scheme:

In one aspect of the present invention, an aluminum alloy refiner is provided, characterized in that the aluminum alloy refiner includes 40-60 parts of Zr, 25-45 parts of Cu , an amorphous alloy of 1-15 parts of Al, 1-10 parts of Pd and 1-10 parts of Nb.

In a preferred aspect of the present invention, the aluminum alloy refiner includes 50 parts of Zr, 35 parts of Cu, 7 parts of Al, 5 parts of Pd and 3 parts of Nb in terms of the amount of substances.

In a preferred aspect of the present invention, the aluminum alloy refiner is prepared by rapid cooling.

In a preferred aspect of the present invention, the rapid cooling is prepared by melting zirconium, copper, aluminum, palladium and niobium at a temperature of 900-1000° C. and using a single-roll stripping machine.

In a preferred aspect of the present invention, the aluminum alloy refiner is prepared by the following method:

(1) Mix pure metal zirconium, copper, aluminum, palladium and niobium in a certain proportion, pre-evacuate to below 10 ^-3 Pa in a vacuum electric arc furnace, and fill with argon (preferably, partial pressure 0.02-0.05MPa) Then smelting is carried out, and the smelting is repeated 5 times to obtain a master alloy with uniform composition; and

(2) The master alloy described in step (1) is broken into small pieces, placed in a quartz tube, pre-evacuated to below ^10-3 Pa by a single-roller stripping machine, and filled with argon (preferably, a partial pressure of 0.05- 0.1MPa) and then use induction heating to melt the master alloy in the quartz tube, the temperature of the liquid alloy is 900-1000°C, adjust the rotation speed of the copper roller to 3000-4000r/min, and spray the liquid alloy onto the surface of the copper roller with argon gas to obtain Amorphous alloy ribbon.

In another aspect of the present invention, there is also provided a method for preparing the aforementioned aluminum alloy refiner, characterized in that the method comprises the steps of:

(1) Mix pure metal zirconium, copper, aluminum, palladium and niobium in a certain proportion, pre-evacuate to below 10 ^-3 Pa in a vacuum electric arc furnace, and fill with argon (preferably, partial pressure 0.02-0.05MPa) Then smelting is carried out, and the smelting is repeated 5 times to obtain a master alloy with uniform composition; and

(2) The master alloy described in step (1) is broken into small pieces, placed in a quartz tube, pre-evacuated to below ^10-3 Pa by a single-roller stripping machine, and filled with argon (preferably, a partial pressure of 0.05- 0.1MPa) and then use induction heating to melt the master alloy in the quartz tube, the temperature of the liquid alloy is 900-1000°C, adjust the rotation speed of the copper roller to 3000-4000r/min, and spray the liquid alloy onto the surface of the copper roller with argon gas to obtain Amorphous alloy ribbon.

In other aspects of the present invention, the following technical solutions are also provided:

In one aspect of the present invention, a method for smelting aluminum alloy is provided, which is characterized in that the method includes the step of using a refiner to treat the aluminum alloy, and the refiner is zirconium-copper-aluminum-palladium- A niobium amorphous alloy, characterized in that the amorphous alloy includes 40-60 parts of Zr, 25-45 parts of Cu, 1-15 parts of Al, 1-10 parts of Pd and 1-10 parts of Nb; preferably, the amorphous alloy includes 50 parts of Zr, 35 parts of Cu, 7 parts of Al, 5 parts of Pd and 3 parts of Nb in terms of the amount of substances.

In a preferred aspect of the present invention, the zirconium-copper-aluminum-palladium-niobium amorphous alloy is prepared by rapid cooling; preferably, the rapid cooling is to combine zirconium, copper, aluminum, palladium and niobium Melted at a temperature of and prepared by a single-roll belt spinner.

In a preferred aspect of the present invention, the zirconium-copper-aluminum-palladium-niobium amorphous alloy is prepared by the following method:

(1) Mix pure metal zirconium, copper, aluminum, palladium and niobium in a certain proportion, pre-evacuate in a vacuum electric arc furnace to below 10 ^-3 Pa, fill it with argon (partial pressure 0.02-0.05MPa) and then smelt , repeated smelting 5 times to obtain a master alloy with uniform composition; and

(2) Break the master alloy described in step (1) into small pieces, place it in a quartz tube, pre-evacuate it to below ^10-3 Pa with a single-roller stripping machine, and fill it with argon (partial pressure 0.05-0.1MPa) Finally, the master alloy in the quartz tube is melted by induction heating, the temperature of the liquid alloy is 900-1000°C, the rotation speed of the copper roller is adjusted to 3000-4000r/min, and the liquid alloy is sprayed onto the surface of the copper roller with argon gas to obtain an amorphous state alloy strip.

In a preferred aspect of the present invention, during the refinement treatment, zirconium-copper-aluminum-palladium-niobium amorphous alloy is added according to 0.15-0.80wt% of the weight of the aluminum alloy to be treated.

In a preferred aspect of the present invention, the refining process includes the steps of: (1) melting the aluminum alloy to be processed at 750-800 degrees Celsius, and removing slag and gas; and (2) according to the weight of the aluminum alloy to be processed 0.15-0.80 wt% of the zirconium-copper-aluminum-palladium-niobium amorphous alloy is added, kept for 5-120 minutes, and degassed.

In a preferred aspect of the present invention, the melting temperature in step (1) is 790 degrees Celsius, and zirconium-copper-aluminum-palladium-niobium amorphous alloy is added in step (2) according to 0.20wt% of the weight of the aluminum alloy to be treated.

In a preferred aspect of the present invention, the melting temperature in step (1) is 790 degrees Celsius, and zirconium-copper-aluminum-palladium-niobium amorphous alloy is added in step (2) according to 0.60wt% of the weight of the aluminum alloy to be treated.

In a preferred aspect of the present invention, step (2) is incubated for 5-120 minutes; for example, incubated for 5, 10, 30, 45 or 60 minutes.

In other aspects of the present invention, the aluminum alloy prepared by the aforementioned method is also provided.

In other aspects of the present invention, the use of the above-mentioned aluminum alloy in casting aluminum alloy wheels is also provided.

In other aspects of the present invention, the following technical solutions are provided:

In one aspect of the present invention, there is provided a process for modifying A356 aluminum alloy by adding zirconium-copper-aluminum-palladium-niobium amorphous strip master alloy, which is characterized in that: comprising the following steps:

Step 1, using a single-roller stripping machine to prepare zirconium-copper-aluminum-palladium-niobium amorphous strips: according to the atomic percentage of Zr is 40%-60%, the atomic percentage of Cu is 25%-45%, and the atomic percentage of Al The percentage is 1%-15%, the atomic percentage of Pd is 1%-10%, and the atomic percentage of Nb is 1%-10%. The raw material is configured, and the raw material is first melted in a non-consumable arc melting furnace, and then Putting the smelted alloy in a single-roll stripping machine to prepare zirconium-copper-aluminum-palladium-niobium amorphous strips;

Step 2, smelting and refining: A356 aluminum alloy is used as the alloy raw material, and the chemical composition requirements of A356 aluminum alloy are shown in Table 1, and the zirconium-copper-aluminum-palladium-niobium amorphous strip obtained in step 1 is used as the master alloy. Put the A356 aluminum alloy into a resistance furnace for melting, the melting temperature is 750-800°C, put the alloy raw material at this melting temperature and keep it warm for 30-50min until the A356 alloy raw material is completely melted, remove the slag and stir for 30S, and then pass in Ar gas and N ₂ or other inert gas for 3-30 minutes for degassing, slag removal after 5-15 minutes of heat preservation; add the zirconium-copper-aluminum-palladium-niobium amorphous strip prepared in step 1 according to the mass percentage of the alloy raw material at 0.2-0.6% , keep warm at 750-800°C for 5-120 minutes; during the heat preservation process, pass Ar gas, N ₂ or other inert gas for 3-30 minutes to degas, after the heat preservation is over, remove the slag and stir for 3-5 minutes, then take out the crucible and put it in the air.

Step 3. Gravity casting: When the temperature of the aluminum melt is 700-750°C, remove the slag, cast the aluminum melt into a cast iron mold preheated to 200°C, and form an aluminum alloy rod after natural air cooling;

Step 4, heat treatment: heat treatment the aluminum alloy bar in the cast iron mold, including,

Solution treatment: keep the aluminum alloy bar in a heat treatment furnace at 535±5°C for 2 to 6 hours, and transfer it to hot water at 70-90°C within 20 seconds for quenching treatment. Stay in the water for 2-5 minutes and take it out;

Aging treatment: After the quenching treatment, transfer the bar to a heat treatment furnace between 130-160°C for 3-12 hours, then air-cool.

In one aspect of the present invention, the application of the A356 aluminum alloy prepared according to the above-mentioned process method for modifying the A356 aluminum alloy with zirconium-copper-aluminum-palladium-niobium amorphous strip master alloy in the manufacture of automobile wheels is provided.

In one aspect of the present invention, a process method for modifying A356 aluminum alloy with zirconium-copper-aluminum-palladium-niobium amorphous strip master alloy is provided, comprising the following steps: preparing zirconium-copper- Aluminum-palladium-niobium amorphous strip: A356 aluminum alloy is used as the alloy raw material, zirconium-copper-aluminum-palladium-niobium amorphous strip is used as the intermediate alloy, and the mass percentage of the alloy raw material is 0.2-0.6%. The master alloy is smelted by putting the aluminum alloy in a resistance furnace at a melting temperature of 750-800°C, adding the master alloy and keeping it warm for 5-120 minutes; gravity casting and heat treatment. Adding zirconium-copper-aluminum-palladium-niobium amorphous strips as the master alloy of the A356 aluminum alloy, compared with the A356 aluminum alloy without the master alloy, the grains are refined, the eutectic silicon structure is more dispersed and uniform, and the mechanical properties are improved. A certain improvement.

In the present invention, by adopting zirconium-copper-aluminum-palladium-niobium amorphous strip master alloy as the modifier of A356 aluminum alloy, not only the crystal grains can be finely refined, but also the mechanical properties of the alloy have been improved to a certain extent, such as As shown in Figure 3, the medium-gold alloy improves the strength and plasticity of the alloy, and the refined A356 aluminum alloy is very suitable for manufacturing automobile wheels.

Description of drawings

Below, describe embodiment of the present invention in detail in conjunction with accompanying drawing, wherein:

Fig. 1 is the as-cast metallographic structure diagram of adding zirconium-copper-aluminum-palladium-niobium amorphous strip master alloy in A356 aluminum alloy in embodiment 1-5 of the present invention, wherein, (a) is the casting state of embodiment 1 State metallographic structure figure, (b) is the cast state metallographic structure figure of embodiment 2, (c) is the cast state metallographic structure figure of embodiment 3, (d) is the cast state metallographic structure figure of embodiment 4 , (e) is the as-cast metallographic structure diagram of embodiment 5.

Fig. 2 is the metallographic structure diagram of the heat treatment state of adding zirconium-copper-aluminum-palladium-niobium amorphous strip master alloy in the A356 aluminum alloy of the embodiment 1-5 of the present invention, wherein, (a) is the heat treatment of the embodiment 1 State metallographic structure chart, (b) is the heat treatment state metallographic structure figure of embodiment 2, (c) is the heat treatment state metallographic structure figure of embodiment 3, (d) is the heat treatment state metallographic structure figure of embodiment 4 , (e) is the metallographic structure diagram of the heat treatment state of embodiment 5.

Fig. 3 is the mechanical performance diagram of adding zirconium-copper-aluminum-palladium-niobium amorphous strip intermediate alloy in A356 aluminum alloy in Example 1-5 of the present invention, wherein, (a) is tensile strength; (b) is Yield strength; (c) is elongation.

Figure 4 is the DSC and XRD patterns of Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous strips added in the present invention, wherein (a) is a DSC pattern and (b) is an XRD pattern.

Detailed ways

The detailed content of the present invention is introduced below through the examples, and the examples are provided for the convenience of understanding, and are by no means limiting the present invention.

The invention proposes a zirconium-copper-aluminum-palladium-niobium amorphous strip as an intermediate alloy to modify the A356 aluminum alloy, which improves the strength and plasticity of the alloy, and the processed A356 aluminum alloy can be used in the manufacture of automobiles wheel.

Embodiment 1: A kind of Zr-Cu-Al-Pd-Nb amorphous strip intermediate alloy modification processing method of A356 aluminum alloy, its steps are as follows:

Step 1, using a single-roller stripping machine to prepare zirconium-copper-aluminum-palladium-niobium amorphous strips: according to the atomic percentage of Zr is 50%, the atomic percentage of Cu is 35%, the atomic percentage of Al is 7%, Pd The atomic percent of Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous strip master alloy was prepared with 5 atomic percent and 3 atomic percent of Nb. The process is as follows: pure metal zirconium, copper, aluminum, palladium and niobium are mixed in a certain proportion, pre-evacuated in a vacuum electric arc furnace to below 10 ^-3 Pa, filled with argon (partial pressure 0.02-0.05MPa) and then smelted , repeated smelting 5 times to obtain a master alloy with uniform composition; the master alloy was broken into small pieces, placed in a quartz tube, pre-evacuated to below 10 ^-3 Pa by a single-roller stripping machine, and filled with argon (partial pressure 0.05 -0.1MPa), melt the master alloy in the quartz tube by induction heating, the temperature of the liquid alloy is 900-1000°C, adjust the rotation speed of the copper roller to 3000-4000r/min, spray the liquid alloy onto the surface of the copper roller with argon gas, and make Amorphous alloy strips were obtained. Fig. 4 shows the DSC pattern and XRD pattern of the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous strips. The DSC chart and XRD chart show that the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ master alloy of the present invention is an amorphous alloy.

Step 2: Smelting and refining: the alloy raw material is A356 aluminum alloy, and the master alloy is the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous ribbon master alloy prepared in Step 1. Melting in a resistance furnace, the melting temperature is 790°C, put A356 aluminum alloy at this temperature and keep it warm for 35 minutes to ensure that the A356 aluminum alloy is completely melted, remove the slag and stir for 30 seconds, inject Ar gas for 3 minutes to degas, remove the slag after holding for 5 minutes, add A356 aluminum alloy with 0.2wt% Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous strip master alloy was kept at 790°C for 5 minutes; After the slag was stirred for 3-5 minutes, the crucible was taken out and placed in the air.

Step 3. Gravity casting: When the temperature of the aluminum melt is 750°C, remove the slag, cast the aluminum melt into a cast iron mold preheated to 200°C, and cool it naturally to form a bar.

Step 4: Carry out T6 heat treatment to the bar in the cast iron mold (i.e. aging treatment after solution treatment), wherein the solution treatment is that the bar is kept in a heat treatment furnace at 540°C for 2 hours, and heated in hot water at 80°C Perform quenching treatment. For aging treatment, after the quenching treatment is completed, the bar is transferred to a heat treatment furnace at 150°C for 12 hours and then air-cooled.

Step 4, heat treatment: heat treatment the aluminum alloy bar in the cast iron mold, including,

Solution treatment: keep the aluminum alloy bar in a heat treatment furnace at 540°C for 2 hours, transfer it to hot water at 80°C within 20 seconds for quenching, and stay in hot water for 2-5 minutes take out;

Aging treatment: After the quenching treatment, transfer the bar to a heat treatment furnace at 150°C for 12 hours, then air cool.

Utilize Olympus metallographic microscope GX51 to carry out metallographic detection to the sample that step 3 obtains, as shown in (a) among Fig. 1, carry out metallographic detection to the sample that step 4 makes, as shown in Fig. 2 As shown in (a), utilize the WDW-200,000 mechanical testing machine tensile rate to be 0.1mm/min to carry out tensile mechanical property test to the sample that step 4 makes, as shown in Fig. 3 (a), (b) and (c) shown.

Embodiment 2: A kind of Zr-Cu-Al-Pd-Nb amorphous strip intermediate alloy modification processing method of A356 aluminum alloy, its steps are as follows:

Step 1: Prepare the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous ribbon master alloy, the same as in the first embodiment.

Step 2: smelting and refining. The difference between this step 2 and step 2 in Example 1 is that the holding time at 790° C. is changed from 5 minutes to 10 minutes after adding the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous ribbon master alloy.

Step three, gravity casting, same as embodiment one.

Step 4: Carry out T6 heat treatment to the bar in the cast iron mold, same as in Example 1.

Metallographic detection is carried out to the sample obtained in step 3, as shown in (b) in Figure 1, metallographic detection is carried out to the sample obtained in step 4, as shown in (b) in Figure 2, for step 4 The prepared samples were tested for tensile mechanical properties, as shown in (a), (b) and (c) in Figure 3.

Embodiment 3: A kind of Zr-Cu-Al-Pd-Nb amorphous strip master alloy modification processing method of A356 aluminum alloy, its steps are as follows:

Step 1: Prepare the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous ribbon master alloy, the same as in the first embodiment.

Step 2, smelting and refining, the difference between this step 2 and step 2 in Example 1 is that the holding time at 790° C. is changed from 5 min to 30 min after adding the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous strip master alloy.

Step three, gravity casting, same as embodiment one.

Step 4: Carry out T6 heat treatment to the bar in the cast iron mold, same as in Example 1.

Metallographic detection is carried out to the sample obtained in step 3, as shown in (c) in Figure 1, metallographic detection is carried out to the sample obtained in step 4, as shown in (c) in Figure 2, for step 4 The prepared samples were tested for tensile mechanical properties, as shown in (a), (b) and (c) in Figure 3.

Embodiment 4: A kind of Zr-Cu-Al-Pd-Nb amorphous strip master alloy modification processing method of A356 aluminum alloy, its steps are as follows:

Step 1: Prepare the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous ribbon master alloy, the same as in the first embodiment.

Step 2: smelting and refining. The difference between this step 2 and step 2 in Example 1 is that the holding time at 790° C. is changed from 5 min to 45 min after adding the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous ribbon master alloy.

Step three, gravity casting, same as embodiment one.

Step 4: Carry out T6 heat treatment to the bar in the cast iron mold, same as in Example 1.

Metallographic detection is carried out to the sample that step 3 obtains, as shown in (d) among Fig. 1, the sample that step 4 makes is carried out metallographic detection, as shown in (d) among Fig. 2, to step 4 The prepared samples were tested for tensile mechanical properties, as shown in (a), (b) and (c) in Figure 3.

Embodiment 5: A kind of Zr-Cu-Al-Pd-Nb amorphous strip master alloy modification processing method of A356 aluminum alloy, its steps are as follows:

Step 1: Prepare the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous ribbon master alloy, the same as in the first embodiment.

Step 2, smelting and refining, the difference between this step 2 and step 2 in Example 1 is that the holding time at 790°C is changed from 10 min to 60 min after adding the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous strip master alloy.

Step three, gravity casting, same as embodiment one.

Step 4: Carry out T6 heat treatment to the bar in the cast iron mold, same as in Example 1.

Metallographic detection is carried out to the sample obtained in step 3, as shown in (e) in Figure 1, metallographic detection is carried out to the sample obtained in step 4, as shown in (e) in Figure 2, for step 4 The prepared samples were tested for tensile mechanical properties, as shown in (a), (b) and (c) in Figure 3.

Embodiment 6: A kind of Zr-Cu-Al-Pd-Nb amorphous stripe intermediate alloy modification processing method of A356 aluminum alloy, its steps are as follows:

Step 1: Prepare the Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ amorphous ribbon master alloy, the same as in the first embodiment.

Step 2, smelting and refining, the difference between this step 2 and step 2 in Example 1 is that the quality of the intermediate alloy of Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃ is changed from 0.2wt% of A356 aluminum alloy to 0.6 wt%.

Step three, gravity casting, same as embodiment one.

Step 4: Carry out T6 heat treatment to the bar in the cast iron mold, same as in Example 1.

Through the above Examples 1-6 and Figure 1, Figure 2, and Figure 3, it can be seen that the addition of Zr-Cu-Al-Pd-Nb amorphous strip master alloy, the α-Al phase appears to be refined, and the modified The mechanical properties of A356 have been improved to a certain extent. Comparing Figure 1 and Figure 2, it can be seen that the eutectic silicon phase in the eutectic structure after heat treatment transforms from elongated and aggregated spherical to nearly spherical and diffusely distributed in the α-Al matrix phase. Comparing (a), (b), (c), (d), and (e) in Figure 1, it can be seen that in (c), that is, the dendrite structure of Example 3 is the thickest, and the primary dendrite and the secondary dendrite The lengths are higher than other structures. Figure 3 shows that the tensile strength and yield strength of (c) are both very low, but the elongation of the material is increased, which shows that the growth of dendrites reduces the tensile strength and yield strength of the material But it can improve the plasticity of the material. The general requirements for the mechanical properties of A356 aluminum alloy for automobile wheels are: tensile strength Rm>220MPa, yield strength Rp0.2>180MPa, elongation As>7%. Examples 1, 2, and 4 meet this requirement, and the implementation The mechanical properties of Example 1 are the best when the holding time is prolonged for 5 minutes. With the extension of the holding time, the mechanical properties first decrease and then increase, but the plasticity of the material shows the opposite trend. With the extension of the holding time, the plasticity first increases and then decreases. It is in line with the general law that the tensile strength increases and the plasticity decreases.

The preparation method of the present invention has the following advantages:

(1) A new type of amorphous master alloy is adopted. The DSC and XRD of Figure 4 show that this strip is an amorphous alloy. The use of an amorphous alloy makes the metallographic structure of the final product more uniform.

(2) The master alloy is added in the form of strips, which dissolves rapidly in the molten aluminum and can be distributed evenly and dispersedly after proper mechanical stirring.

(3) The grains of A356 aluminum alloy treated with Zr-Cu-Al-Pd-Nb amorphous strip intermediate alloy are uniform and fine, and the alloy elements are uniformly dispersed in the aluminum matrix, which is helpful to improve the mechanical properties of A356 aluminum alloy.

(4) Adding the Zr-Cu-Al-Pd-Nb amorphous ribbon intermediate alloy, when the as-cast structure is kept warm for 30 minutes, the dendrites are the largest and the thickest.

(5) The mechanical property of embodiment 1 heat preservation 5min is the best, along with the prolongation of heat preservation time, the phenomenon that mechanical property appears to decrease first and then increases, but the plasticity of material shows opposite trend, with the prolongation of heat preservation time, plasticity improves first This is in line with the general rule that the tensile strength increases and the plasticity decreases.

At the same time, the inventor also prepared and tested the zirconium-copper-aluminum-palladium-niobium amorphous alloy of the following composition:

(A) 40 parts of Zr, 45 parts of Cu, 1 part of Al, 10 parts of Pd and 1 part of Nb

(B) 60 parts of Zr, 25 parts of Cu, 15 parts of Al, 1 part of Pd and 10 parts of Nb

(C) 52 parts of Zr, 29 parts of Cu, 7 parts of Al, 7 parts of Pd and 3 parts of Nb

(D) 57 parts of Zr, 41 parts of Cu, 12 parts of Al, 5 parts of Pd and 1 part of Nb

The results show that under the conditions of Example 1, the amorphous alloys of the above groups:

(1) The tensile strength Rm of the aluminum alloy produced by the treatment is higher than 230MPa, and the Rm value of the amorphous alloy of group (B) is the highest, which is 283MPa;

(2) The yield strength of the aluminum alloy produced by the treatment is higher than Rp0.2180MPa, and the value of group (D) is the highest, which is 220.1MPa;

(3) The elongation As of the aluminum alloy produced by the treatment is higher than 7.0%, and the elongation value of group (A) is the highest, which is 10.625%.

The present invention is described through the above examples in combination with the accompanying drawings, but the above examples are only for better introduction of this experiment and do not limit the implementation scope of the present invention. All equivalent deformations and related modifications made according to the present invention or without departing from the experimental purpose of this invention are within the scope of protection of the present invention.

Claims (10)

1. an aluminium alloy fining agent, is characterized in that, is the non-crystaline amorphous metal of the Nb of Pd and 1-10 part of Al, 1-10 part of Cu, 1-15 part of Zr, 25-45 part comprising 40-60 part in the aluminium alloy fining agent that amount of substance mark is described.

2. aluminium alloy fining agent according to claim 1, is characterized in that, described aluminium alloy fining agent is following one:

Described non-crystaline amorphous metal, in amount of substance mark, comprises the Nb of the Zr of 50 parts, the Cu of 35 parts, the Al of 7 parts, 5 parts Pd and 3 part;

Described non-crystaline amorphous metal, in amount of substance mark, comprises the Nb of the Zr of 40 parts, the Cu of 45 parts, the Al of 1 part, 10 parts Pd and 1 part;

Described non-crystaline amorphous metal, in amount of substance mark, comprises the Nb of the Zr of 60 parts, the Cu of 25 parts, the Al of 15 parts, 1 part Pd and 10 part;

Described non-crystaline amorphous metal, in amount of substance mark, comprises the Nb of the Zr of 52 parts, the Cu of 29 parts, the Al of 7 parts, 7 parts Pd and 3 part; And

Described non-crystaline amorphous metal, in amount of substance mark, comprises the Nb of the Zr of 57 parts, the Cu of 41 parts, the Al of 12 parts, 5 parts Pd and 1 part.

3. the aluminium alloy fining agent described in claim 1 or 2, is characterized in that, described aluminium alloy fining agent is prepared by cooling fast.

4. aluminium alloy fining agent according to claim 3, is characterized in that, described quick cooling is melted at the temperature of 900-1000 DEG C zirconium, copper, aluminium, palladium and niobium, and gets rid of band machine by single roller and be prepared from.

5. the aluminium alloy fining agent described in claim 1 or 2, is characterized in that, described aluminium alloy fining agent is prepared by following method:

(1) pure metal zirconium, copper, aluminium, palladium and niobium are mixed by a certain percentage, forvacuum to 10 in vacuum arc fumace ^-3below Pa, carries out melting after being filled with argon gas, melt back 5 times, the mother alloy of obtained uniform composition; And

(2) mother alloy described in step (1) is broken into fritter, is placed in silica tube, single roller gets rid of the forvacuum to 10 of band machine ^-3below Pa, melted by the mother alloy in silica tube with induction heating after being filled with argon gas, liquid alloy temperature is 900-1000 DEG C, and adjustment copper roller rotating speed 3000-4000r/min, is ejected to copper roller surface with argon gas by liquid alloy, obtained noncrystalline alloy strip.

6. aluminium alloy fining agent according to claim 5, is characterized in that, in step (1), the dividing potential drop of argon gas is 0.02-0.05MPa.

7. aluminium alloy fining agent according to claim 5, is characterized in that, in step (2), the dividing potential drop of argon gas is 0.05-0.1MPa.

8. the method for the zirconium-copper-aluminium-palladium-niobium non-crystaline amorphous metal of preparation according to any one of claim 1-7, it is characterized in that, described method comprises step:

(1) pure metal zirconium, copper, aluminium, palladium and niobium are mixed by a certain percentage, forvacuum to 10 in vacuum arc fumace ^-3below Pa, carries out melting after being filled with argon gas, melt back 5 times, the mother alloy of obtained uniform composition; And

(2) mother alloy described in step (1) is broken into fritter, is placed in silica tube, single roller gets rid of the forvacuum to 10 of band machine ^-3below Pa, melted by the mother alloy in silica tube with induction heating after being filled with argon gas, liquid alloy temperature is 900-1000 DEG C, and adjustment copper roller rotating speed 3000-4000r/min, is ejected to copper roller surface with argon gas by liquid alloy, obtained noncrystalline alloy strip.

9. method according to claim 8, is characterized in that, in step (1), the dividing potential drop of argon gas is 0.02-0.05MPa.

10. method according to claim 8, is characterized in that, in step (2), the dividing potential drop of argon gas is 0.05-0.1MPa.