High-hardness precision aluminum alloy and heat treatment method thereof

Abstract

The invention discloses a high-hardness precision aluminum alloy and a heat treatment method thereof. The heat treatment method of the high-hardness precision aluminum alloy comprises the following steps that a sample machined to the required size is subjected to solution treatment; the sample subjected to solution treatment is subjected to oil quenching, the transfer time of the sample is smaller than or equal to 40 s, the oil tank temperature of oil quenching is 20-50 DEG C, and in the oil quenching process, the stirring rotating speed is 600-900 rpm; draining off the sample subjected to oil quenching and fully removing oil; carrying out aging treatment on the deoiled sample, and cooling to room temperature; and the sample subjected to aging treatment is polished, deoiled and decontaminated, and the high-hardness precision aluminum alloy is obtained. By implementing the method, on the basis of ensuring the product precision, the strength and hardness are greatly improved, the product processing time is shortened, and the loss is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum alloy heat treatment, in particular to a high-hardness precision aluminum alloy and a heat treatment method thereof. BACKGROUND

[0002] Aluminum alloy has the advantages of high specific strength, good performance, and good oxidation effect, and is widely used. For precision machining products, the product tolerance is within 0.05mm or even 0.01mm, and if the product hardness or strength does not meet the standard, it is usually discarded, causing great loss.

[0003] For precision machined parts, multiple machining and multiple annealing are usually used to ensure the precision of product size, but multiple annealing will cause a large decrease in product hardness, and even the product hardness cannot meet the requirements, which easily causes the product to be discarded, and the machining process is multiple, which is low in efficiency. Using high-temperature solid solution, water quenching and multi-stage aging treatment, combined with one-time precision machining can improve product precision, but the process takes a long time and increases the risk of product deformation after machining, resulting in a high product failure rate. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a high-hardness precision aluminum alloy and a heat treatment method thereof, which greatly improves the strength and hardness on the basis of ensuring product precision, shortens the product machining time and reduces the loss.

[0005] In order to solve the above problems, a heat treatment method of a high-hardness precision aluminum alloy is disclosed, comprising the following steps:

[0006] The sample machined to the required size is subjected to solid solution treatment;

[0007] The sample after solid solution treatment is oil quenched, the transfer time of the sample is ≤40s, the oil tank temperature of oil quenching is 20℃-50℃, and the stirring speed during oil quenching is 600rpm-900rpm;

[0008] The oil quenched sample is drained and fully deoiled;

[0009] The deoiled sample is subjected to aging treatment and cooled to room temperature;

[0010] The sample after aging treatment is polished, deoiled and decontaminated to obtain a high-hardness precision aluminum alloy.

[0011] As an improvement of the above technical solution, quenching oil is used for oil quenching, and the quenching oil comprises the following components in mass percentage: 5-10% of a cold catalyst, 0.5-1.5% of a surfactant, 0.5-3% of a dispersing agent, 0.5-2% of a nano molecular sieve, 0.5-1% of an auxiliary antioxidant, and the balance of base oil.

[0012] As the improvement of the above technical scheme, the 40℃ kinematic viscosity of the base oil is 20cSt-40cSt, and the 25℃ thermal conductivity is 0.13W / (m·K)-0.16W / (m·K); the base oil is one or more of paraffin-based mineral oil, synthetic hydrocarbon base oil, polyol ester base oil, and animal and plant oil.

[0013] As the improvement of the above technical scheme, the base oil comprises paraffin-based mineral oil and soybean oil, and the mass ratio of the paraffin-based mineral oil to the soybean oil is 1:(0.25-0.6).

[0014] As the improvement of the above technical scheme, the quenching agent is one or more of petroleum sulfonate, trimethylphenyl phosphate, and polyisobutylene; the surfactant is one or more of imidazoline oleate, polyether-modified siloxane, methyl terpene resin, and oleic acid amide; the dispersant is one or more of polyisobutylene succinimide, polyether amine block copolymer, and maleic anhydride-styrene copolymer; and the auxiliary antioxidant is a phenolic antioxidant and / or an amine antioxidant.

[0015] As the improvement of the above technical scheme, the quenching oil is prepared by the following method:

[0016] Part of the base oil is heated to 70-80℃, the dispersant is added and stirred uniformly, the stirring speed is 3000-5000rpm, and the stirring time is 20-30min;

[0017] The nanometer molecular sieve and the auxiliary antioxidant are added, and ultrasonic treatment is performed, the frequency of the ultrasonic treatment is 35-45kHz, the power density is 1.2-1.6W / mL, and the treatment time is 0.5-1h;

[0018] The quenching agent is added, stirred uniformly, heated to 70-80℃, and kept for 2.5-3h;

[0019] The remaining base oil is added, cooled to 40-50℃, the surfactant is added and stirred for 1-1.5h, and then cooled to room temperature to obtain the quenching oil.

[0020] As the improvement of the above technical scheme, the wall thickness of the sample is 0.1-0.3mm.

[0021] As the improvement of the above technical scheme, the heating time of the solid solution treatment is 3-8min, the solid solution temperature is 500-550℃, and the holding time is 10-50min.

[0022] As the improvement of the above technical scheme, the aging temperature of the aging treatment is 170-200℃, and the holding time is 4-20h.

[0023] Correspondingly, the application also discloses a high-hardness precision aluminum alloy prepared by the heat treatment method.

[0024] The application has the following beneficial effects:

[0025] The heat treatment method provided by the application can reach the solid solution temperature by rapidly heating the processed precision sample, quench the sample in oil at 20-50 DEG C after heat preservation, and then remove the oil by sufficient oil removal treatment, so that the required hardness and strength are achieved by cooperation with primary aging. After aging, the surface oil and dirt are further removed by polishing, and the required size and surface requirements are achieved. The high-hardness precision aluminum alloy prepared by the heat treatment method has a deformation of less than 5 microns, and the heat treatment process level can reach T6 level. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a flowchart of the heat treatment method of the high-hardness precision aluminum alloy provided by the embodiment of the application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the application more clear, the application is further described in detail below.

[0028] Referring to Figure 1 The application provides a heat treatment method of a high-hardness precision aluminum alloy, which comprises the following steps:

[0029] S1, performing solid solution treatment on a sample processed to a required size.

[0030] It can be understood that the sample is processed to a required size after being cast by using a conventional method. Specifically, aluminum alloy components are weighed and uniformly mixed, melted at 700-800 DEG C, and then cast to obtain the sample.

[0031] In an embodiment, the heating time of the solid solution treatment is 3-8 min, the solid solution temperature is 500-550 DEG C, and the heat preservation time is 10-50 min. The rapid heating to the solid solution temperature makes the aluminum alloy quickly pass through the medium temperature zone (300-450 DEG C) during the solid solution process, reduces the recrystallization time, refines the grain size, and the rapid and uniform heating can reduce the thermal gradient, the residual stress distribution is more uniform after quenching, and the rapid heating also shortens the total exposure time of the aluminum alloy at the solid solution temperature, reduces the risk of grain boundary sliding and high-temperature creep.

[0032] S2, performing oil quenching on the sample after the solid solution treatment, the sample transfer time is less than or equal to 40 s, the oil tank temperature of the oil quenching is 20-50 DEG C, and the stirring speed during the oil quenching is 600-900 rpm.

[0033] Compared with water quenching, the cooling speed of oil quenching is slower, especially in the low temperature stage, which helps to reduce thermal stress and microstructure stress, thereby reducing the risk of deformation and cracking of the sample, and better maintaining the shape and size accuracy of the sample. The microstructure of the sample after oil quenching is more uniform, and the toughness and strength are relatively good, which can prolong the service life of the sample. The transfer time of the sample refers to the time experienced from taking out of the heating furnace to entering the oil tank for oil quenching. In order to ensure the quenching quality, the transfer time should be as short as possible, and the transfer time should not exceed 40s. Lower oil tank temperature can improve the cooling speed, which helps to form finer precipitated phases, and improve the strength and toughness of the alloy. Stirring can ensure that the quenching oil is uniformly distributed in the oil tank, and improve the cooling speed and uniformity.

[0034] The quenching oil will undergo oxidation reaction when it is in contact with the sample under high temperature conditions, which will cause the increase of acid value, the deepening of color, the increase of viscosity, the generation of residual carbon and coke particles, and the defects such as oil sludge, which seriously affect the cooling performance and service life. Although the performance of quenching oil can be improved by adding various additives such as antioxidants, the stability of quenching oil is poor due to the interference between different types of additives, which reduces the performance of quenching oil.

[0035] In one embodiment, quenching oil is used for oil quenching, and the quenching oil comprises the following components in mass percentage: 5-10% of cooling agent, 0.5-1.5% of surfactant, 0.5-3% of dispersant, 0.5-2% of nano molecular sieve, 0.5-1% of auxiliary antioxidant, and the balance of base oil.

[0036] In one embodiment, the base oil has a kinematic viscosity of 20-40 cSt at 40℃, and a thermal conductivity of 0.13-0.16 W / (m·K) at 25℃. Optionally, the base oil can be one or more of paraffin-based mineral oil, synthetic hydrocarbon base oil, polyol ester base oil, and animal and plant oil. The base oil is the main carrier of the quenching oil, and its physical properties directly determine the cooling characteristics. Low viscosity base oil can reduce the viscous resistance in the low temperature zone (<300℃), ensuring stable cooling speed, and high thermal conductivity base oil can reduce the temperature difference between the core and the surface of the sample, thereby reducing the residual stress. Preferably, the base oil comprises paraffin-based mineral oil and soybean oil, and the mass ratio of paraffin-based mineral oil to soybean oil is 1:(0.25-0.6). Paraffin-based mineral oil provides good thermal stability and antioxidant properties, and soybean oil can increase the lubricity and environmental friendliness of the oil product. By optimizing the base oil, optimizing the cooling curve, improving the thermal uniformity, balancing the viscosity and polarity of the compounded base oil, and improving the oxidation stability, the stability of the additives after addition is improved, and the quenching quality is significantly improved.

[0037] The chiller is one or more of petroleum sulfonate, tricresyl phosphate, polyisobutylene. The chiller significantly improves the cooling rate in high temperature zone (> 500℃) by destroying the vapor film and promoting nucleate boiling. Preferably, the chiller includes petroleum sulfonate and polyisobutylene, and the mass ratio of petroleum sulfonate to polyisobutylene is 1: (0.2-0.5). The complex chiller can optimize the cooling curve and avoid local supercooling.

[0038] The surfactant is one or more of imidazoline oleate, polyether modified siloxane, methyl terpene resin, oleic acid amide. The surfactant can regulate the interfacial properties, enhance the wettability, and reduce the generation of quenching bubbles. In addition, the surfactant can also prevent the agglomeration of nanoparticles.

[0039] The dispersant is one or more of polyisobutylene succinimide, polyether amine block copolymer, maleic anhydride-styrene copolymer. The dispersant can ensure the stable suspension of nanomolecular sieves. The dispersant can form an oleophobic layer on the surface of nanoparticles through chemical bonding, improving the compatibility of nanomolecular sieves with base oil.

[0040] The nanomolecular sieve has both chiller and antioxidant functions. The nanomolecular sieve shortens the oxidation induction period by selectively adsorbing free radicals, and under the action of the dispersant, the nanomolecular sieve has good dispersion stability in oil. In addition, at high temperature, the rigid framework structure of the nanomolecular sieve can maintain the stability of the cooling rate. Preferably, the pore size of the nanomolecular sieve is 0.5nm-5nm, and the size is 50nm-100nm. The nanomolecular sieve can be selected from SiO nanomolecular sieve and / or AlO3 nanomolecular sieve. The auxiliary antioxidant can be a phenolic antioxidant and / or an amine antioxidant. The nanomolecular sieve and the auxiliary antioxidant are compounded to improve the antioxidant property and cooling uniformity of the quenching oil.

[0041] The quenching oil provided by the application uses mineral oil and vegetable oil as base oil, and is compounded with chiller, surfactant, dispersant, nanomolecular sieve and auxiliary antioxidant. The quenching oil can significantly improve the surface finish of the workpiece, reduce deformation and cracking, prolong the service life of the oil product, and has good environmental protection and safety while ensuring the cooling performance.

[0042] As an improvement of the above technical solution, the quenching oil is prepared by the following method:

[0043] S21, heat part of the base oil to 70-80℃, add the dispersant and stir uniformly, the stirring speed is 3000-5000rpm, and the stirring time is 20-30min.

[0044] S22, add nanometer molecular sieve and auxiliary antioxidant, ultrasonic treatment, the frequency of ultrasonic treatment is 35 kHz-45 kHz, the power density is 1.2 W / mL-1.6 W / mL, and the treatment time is 0.5 h-1 h.

[0045] S23, add refrigerant, stir uniformly, and heat to 70 DEG C-80 DEG C, and keep for 2.5 h-3 h.

[0046] S24, add the remaining base oil, cool to 40 DEG C-50 DEG C, add surfactant and continue stirring for 1 h-1.5 h, and cool to room temperature, thereby obtaining the quenching oil.

[0047] The preparation method of the quenching oil provided by the application adds the base oil into the system twice, improves the uniformity and stability of the additive in the base oil, improves the use effect of the quenching oil, and prolongs the service life of the quenching oil.

[0048] S3, drain and fully remove oil from the oil-quenched sample.

[0049] Specifically, the sample can be washed after preliminary oil draining to fully remove oil, ensure the cleanliness of the sample surface, and avoid subsequent processing pollution or performance degradation. The preliminary oil draining can be gravity draining, that is, the oil-drained sample is placed at an inclination of 15 DEG -30 DEG, the surface-attached quenching oil is naturally flowed and drained by gravity, and the draining time is 5 min-10 min. The washing can use a washing liquid, and the washing liquid can be selected from carbon-hydrogen solvents, trichloroethylene solvents or sodium hydroxide alkaline washing liquid. The washing temperature is 40 DEG C-80 DEG C, and the washing time is 1 min-5 min.

[0050] S4, age the oil-removed sample, and cool to room temperature.

[0051] In one embodiment, the aging temperature of the aging treatment is 170 DEG C-200 DEG C, and the holding time is 4 h-20 h. Preferably, the aging temperature is 180 DEG C-190 DEG C, and the holding time is 4 h-10 h. In combination with rapid solid solution and oil quenching, only first-stage aging is needed, which is simple and efficient, improves the dimensional stability of the sample on the basis of retaining strength and hardness.

[0052] S5, polish the aged sample to remove oil and dirt, thereby obtaining the high-hardness precision aluminum alloy.

[0053] In one embodiment, the sample can be polished and deoiled and decontaminated by magnetic force polishing. Specifically, a stainless steel needle is used as the polishing material, the diameter of the stainless steel needle is 0.4mm-0.7mm, the length of the stainless steel needle is 4mm-6mm, the motor frequency is 30Hz-50Hz, the rotating speed is 50r / min-60r / min, the polishing time is 1min-4min, and only water-based polishing liquid containing a small amount of surfactant is added during the process, so that a sample with a bright, flat and uniform surface is obtained.

[0054] The heat treatment method of the high-hardness precision aluminum alloy provided by the application is particularly suitable for thin-walled 6-series alloys. In one embodiment, the wall thickness of the sample is 0.1mm-0.3mm, and exemplary wall thicknesses are 0.12mm, 0.15mm, 0.18mm, 0.2mm or 0.25mm, but the application is not limited thereto. Thin-walled alloys are prone to deformation during heat treatment due to thermal stress, non-uniformity of phase transformation, cooling rate gradient and other reasons. However, by using the heat treatment method provided by the application, the solid solution temperature is quickly reached, the high-temperature residence time is reduced, the grain growth is inhibited, the sample is quenched in oil at 20℃-50℃ after holding, the quenching process is controllable, the residual stress is significantly reduced, and then the sample is subjected to sufficient deoiling treatment, and the required hardness and strength are achieved through primary aging. After aging, the sample is polished to further remove surface oil and dirt, and the required size and surface requirements are achieved. The high-hardness precision aluminum alloy prepared by the heat treatment method provided by the application has a deformation amount of <5μm, and the heat treatment process level can reach T6 level.

[0055] By using the heat treatment method of the high-hardness precision aluminum alloy provided by the application, the sample has good size stability, a deformation amount of <5μm, and can meet the requirements of precision aluminum alloys, and the heat treatment process level can reach T6 level. Specifically, the tensile strength of 6061 alloy is above 300MPa, the yield strength is above 250MPa, and the hardness is above 110HV, the tensile strength of 6063 alloy is above 210MPa, the yield strength is above 180MPa, and the hardness is above 90HV.

[0056] Correspondingly, the application also discloses a high-hardness precision aluminum alloy prepared by the heat treatment method.

[0057] The application will be further described below by means of specific examples:

[0058] Example 1

[0059] The application provides a heat treatment method of a high-hardness precision aluminum alloy, which comprises the following steps:

[0060] S1, a sample processed to a required size is subjected to solid solution treatment.

[0061] The alloy composition of the 6061 aluminum alloy is Al-0.9Mg-0.7Si-0.3Cu-0.05Cr, and the wall thickness is 0.15mm.

[0062] The heating time of the solid solution treatment is 5min, the solid solution temperature is 530℃, and the holding time is 30min.

[0063] S2, the sample after solid solution treatment is oil quenched, the transfer time of the sample is ≤30s, the oil tank temperature of the oil quenching is 20℃, and the stirring speed during the oil quenching is 800rpm.

[0064] The quenching oil is a quenching oil commonly used in the art.

[0065] S3, the oil quenched sample is drained and fully deoiled.

[0066] S4, the deoiled sample is subjected to aging treatment and cooled to room temperature.

[0067] The aging temperature of the aging treatment is 180℃, the holding time is 10h, and the air cooling is to room temperature.

[0068] S5, the sample after aging treatment is polished, deoiled and decontaminated, and a high-hardness precision aluminum alloy is obtained.

[0069] Example 2

[0070] The embodiment provides a heat treatment method of a high-hardness precision aluminum alloy, which is different from the embodiment 1 in that the quenching oil comprises the following components in percentage by mass: 8% of a chillant, 0.8% of a surfactant, 1% of a dispersant, 1.5% of a nano molecular sieve, 0.5% of an auxiliary antioxidant, and the balance of base oil.

[0071] The base oil has a kinematic viscosity of 30cSt at 40℃ and a thermal conductivity of 0.14W / (m·K) at 25℃, and comprises paraffin-based mineral oil and soybean oil in a mass ratio of 1:0.3. The chillant comprises petroleum sulfonate and polyisobutylene in a mass ratio of 1:0.2. The surfactant is a polyether-modified siloxane. The dispersant is polyisobutylene succinimide. The nano molecular sieve is selected from SiO nano molecular sieves. The auxiliary antioxidant is a phenolic antioxidant.

[0072] The quenching oil is prepared by the following method:

[0073] S21, a part of the base oil is heated to 75℃, the dispersant is added and stirred uniformly, the stirring speed is 4000rpm, and the stirring time is 25min.

[0074] S22, the nano molecular sieve and the auxiliary antioxidant are added and ultrasonically treated, the frequency of the ultrasonic treatment is 40kHz, the power density is 1.4W / mL, and the treatment time is 0.6h.

[0075] S23, add the refrigerant, stir until uniform, and warm to 75℃ for 2.5h.

[0076] S24, add the remaining base oil, cool to 40℃, add the surfactant, continue stirring for 1.2h, and cool to room temperature to obtain the quenching oil.

[0077] The rest is the same as in Example 1.

[0078] Example 3

[0079] The present example provides a heat treatment method for a high-hardness precision aluminum alloy, comprising the following steps:

[0080] S1, subject the sample machined to the required size to solid solution treatment.

[0081] The alloy composition is 6063 aluminum alloy with Al-0.55Mg-0.4Si, and the wall thickness is 0.2mm.

[0082] The temperature rising time for the solid solution treatment is 5min, the solid solution temperature is 520℃, and the holding time is 15min.

[0083] S2, subject the sample after the solid solution treatment to oil quenching, the sample transfer time is ≤40s, the oil tank temperature for the oil quenching is 30℃, and the stirring speed during the oil quenching is 900rpm.

[0084] The quenching oil is a conventional quenching oil in the art.

[0085] S3, drain and thoroughly remove oil from the sample after the oil quenching.

[0086] S4, subject the sample after the oil removal to aging treatment, and cool to room temperature.

[0087] The aging temperature for the aging treatment is 190℃, the holding time is 4h, and the air cooling is to room temperature.

[0088] S5, polish, remove oil and remove dirt from the sample after the aging treatment to obtain the high-hardness precision aluminum alloy.

[0089] Example 4

[0090] The present example provides a heat treatment method for a high-hardness precision aluminum alloy, which differs from Example 3 in that the quenching oil comprises the following components in mass percentage: refrigerant 5%, surfactant 0.6%, dispersant 0.8%, nano molecular sieve 1.2%, auxiliary antioxidant 0.5%, and the rest is base oil.

[0091] The base oil has a kinematic viscosity of 32 cSt at 40 DEG C and a thermal conductivity of 0.145 W / (m*K) at 25 DEG C, and includes paraffin-based mineral oil and soybean oil in a mass ratio of 1:0.25. The refrigerant includes petroleum sulfonate and polyisobutylene in a mass ratio of 1:0.25. The surfactant is a polyether-modified siloxane. The dispersant is polyisobutylene succinimide. The nano molecular sieve is SiO nano molecular sieve. The auxiliary antioxidant is a phenolic antioxidant.

[0092] The quenching oil is prepared by the following method:

[0093] S21, a part of the base oil is heated to 75 DEG C, the dispersant is added and stirred uniformly, the stirring speed is 4000 rpm, and the stirring time is 25 min.

[0094] S22, the nano molecular sieve and the auxiliary antioxidant are added, and ultrasonic treatment is performed, the frequency of the ultrasonic treatment is 40 kHz, the power density is 1.4 W / mL, and the treatment time is 0.6 h.

[0095] S23, the refrigerant is added, stirred uniformly, heated to 75 DEG C, and kept for 2.5 h.

[0096] S24, the remaining base oil is added, cooled to 40 DEG C, the surfactant is added and stirred for 1.2 h, and then cooled to room temperature to obtain the quenching oil.

[0097] The rest is the same as example 3.

[0098] Examples 1-4 are detected, and the specific results are as follows:

[0099]

[0100] The above is the preferred embodiment of the application. It should be noted that for those skilled in the art, without departing from the principles of the application, a number of improvements and refinements can be made, which are also considered within the scope of protection of the application.

Claims

1. A heat treatment method of a high-hardness precision aluminum alloy, characterized by, The method comprises the following steps: a sample machined to a required size is subjected to solid solution treatment; the sample after the solid solution treatment is oil quenched, the sample transfer time is less than or equal to 40s, the oil tank temperature of the oil quenching is 20-50 DEG C, and the stirring speed during the oil quenching is 600-900 rpm; the sample after the oil quenching is drained and fully deoiled; the sample after the deoiling is subjected to aging treatment and cooled to room temperature; the sample after the aging treatment is polished, deoiled and decontaminated, thereby obtaining a high-hardness precision aluminum alloy.

2. The heat treatment method of a high-hardness precision aluminum alloy according to claim 1, characterized by, The oil quenching is performed by using a quenching oil, the quenching oil comprises the following components in percentage by mass: 5-10% of a quenching agent, 0.5-1.5% of a surfactant, 0.5-3% of a dispersant, 0.5-2% of a nano molecular sieve, 0.5-1% of an auxiliary antioxidant, and the balance of base oil.

3. The heat treatment method of a high-hardness precision aluminum alloy according to claim 2, characterized by, The base oil has a 40 DEG C kinematic viscosity of 20-40 cSt and a 25 DEG C thermal conductivity of 0.13-0.16 W / (m*K); the base oil is one or more of a paraffin-based mineral oil, a synthetic hydrocarbon base oil, a polyhydric alcohol ester base oil and a plant oil.

4. The heat treatment method of a high-hardness precision aluminum alloy according to Claim 3, characterized by, The base oil comprises a paraffin-based mineral oil and soybean oil, and the mass ratio of the paraffin-based mineral oil to the soybean oil is 1:(0.25-0.6).

5. The heat treatment method of a high-hardness precision aluminum alloy according to Claim 2, characterized by, The quenching agent is one or more of petroleum sulfonate, trimethylphenyl phosphate and polyisobutylene; the surfactant is one or more of imidazoline oleate, polyether-modified siloxane, methyl terpene resin and oleic acid amide; the dispersant is one or more of polyisobutylene succinimide, polyether amine block copolymer and maleic anhydride-styrene copolymer; and the auxiliary antioxidant is a phenolic antioxidant and / or an amine antioxidant.

6. The heat treatment method of a high-hardness precision aluminum alloy according to Claim 2, characterized by, The quenching oil is prepared by the following method: a part of the base oil is heated to 70-80 DEG C, the dispersant is added and stirred uniformly, the stirring speed is 3000-5000 rpm, and the stirring time is 20-30 min; the nano molecular sieve and the auxiliary antioxidant are added and subjected to ultrasonic treatment, the frequency of the ultrasonic treatment is 35-45 kHz, the power density is 1.2-1.6 W / mL, and the treatment time is 0.5-1 h; the quenching agent is added, stirred uniformly, heated to 70-80 DEG C, and kept for 2.5-3 h; the remaining base oil is added, cooled to 40-50 DEG C, the surfactant is added and continuously stirred for 1-1.5 h, and then cooled to room temperature, thereby obtaining the quenching oil.

7. The heat treatment method of a high-hardness precision aluminum alloy according to Claim 1, characterized by, The sample has a wall thickness of 0.1-0.3 mm.

8. The heat treatment method of a high-hardness precision aluminum alloy according to Claim 1, characterized by, The solid solution treatment has a heating time of 3-8 min, a solid solution temperature of 500-550 DEG C, and a holding time of 10-50 min.

9. The heat treatment method of a high-hardness precision aluminum alloy according to Claim 1, characterized by, The aging treatment has an aging temperature of 170-200 DEG C and a holding time of 4-20 h.

10. A high hardness precision aluminum alloy, characterized by comprising, in mass %, The heat treatment method is prepared by any one of claims 1-9.

Images