CN108823516B - Method for improving needle-shaped iron-rich phase form in aluminum alloy - Google Patents
Method for improving needle-shaped iron-rich phase form in aluminum alloy Download PDFInfo
- Publication number
- CN108823516B CN108823516B CN201810754341.6A CN201810754341A CN108823516B CN 108823516 B CN108823516 B CN 108823516B CN 201810754341 A CN201810754341 A CN 201810754341A CN 108823516 B CN108823516 B CN 108823516B
- Authority
- CN
- China
- Prior art keywords
- aluminum alloy
- iron
- rich phase
- processing
- friction stir
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention provides a method for improving the needle-shaped iron-rich phase form in an aluminum alloy, and relates to the technical field of aluminum alloy modification. A method of improving the morphology of a needle-like iron-rich phase in an aluminum alloy, comprising: and (3) carrying out friction stir processing on the aluminum alloy product or blank to be processed by adopting friction stir processing equipment, carrying out high-temperature heat treatment on the aluminum alloy product or blank subjected to friction stir processing, and then carrying out quenching, aging, processing and surface treatment. The method has controllable process and simple operation, and can well improve the form of the iron-rich phase. The iron-rich phase prepared by the method is uniform in distribution, fine in particles and high in sphericity, and the harm of iron-rich phase to plasticity is greatly reduced.
Description
Technical Field
The invention relates to the technical field of aluminum alloy improvement, in particular to a method for improving the needle-shaped iron-rich phase form in an aluminum alloy.
Background
Fe is one of the most harmful impurity elements in aluminum and aluminum alloy, and because the solubility of Fe in aluminum melt and aluminum solid is nearly 50 times different, Fe in aluminum and aluminum alloy almost exists in the form of iron-rich phase. Compared with an aluminum matrix, the iron-rich phase has the characteristics of high hardness, high brittleness and the like, and is easy to crack in the iron-rich phase when a member is stressed, so that the iron-rich phase becomes a source of member fracture and failure, and the plasticity and the service life of the member are greatly damaged. In addition, the presence of the coarse and needle-like iron-rich phase hinders the flow of the eutectic molten metal, and becomes an important substrate for formation of pores and shrinkage porosity, and both the length dimension and the pore area fraction linearly increase with the increase in Fe content, further deteriorating the performance of the member.
At present, improving the form of the iron-rich phase is the most common means for alleviating the harm. There are two types of common methods available. One is to change the morphological characteristics of the iron-rich phase by changing its crystal structure, and the other is to change the growth rate of the iron-rich phase to improve its morphology. Both methods belong to the field of fusion casting, and have a plurality of related influence factors and obvious difference of influence mechanisms and degrees, so that the problems of segregation and morphological diversity of an iron-rich phase cannot be well solved.
Disclosure of Invention
The invention aims to provide a method for improving the morphology of a needle-like iron-rich phase in an aluminum alloy, which has the advantages of controllable process, simplicity and convenience in operation and capability of well improving the morphology of the iron-rich phase.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a method for improving the needle-shaped iron-rich phase form in an aluminum alloy, which comprises the following steps:
and (3) carrying out friction stir processing on the aluminum alloy product or blank to be processed by adopting friction stir processing equipment, carrying out heat treatment on the aluminum alloy product or blank subjected to friction stir processing, and then carrying out quenching, aging, processing and surface treatment.
The invention has the beneficial effects that:
the method comprises the steps of carrying out large plastic deformation processing on a thick and needle-shaped iron-rich phase by a stirring friction processing method to obtain an iron-rich phase with uniform distribution and fine particles, then carrying out high-temperature heat preservation treatment for a long time to promote passivation and granulation of the iron-rich phase, further improving the form of the iron-rich phase, and preparing the iron-rich phase with uniform distribution, fine particles and high sphericity, wherein the average particle size of the iron-rich phase is not more than 5 mu m, and the sphericity is not less than 0.75. Thereby improving the tensile strength and the elongation of the aluminum alloy and greatly reducing the harm of iron-rich relative plasticity. The method can be used for preparing high-performance aluminum alloy components, and avoids the problem that common aluminum alloy is easy to crack in an iron-rich phase when stressed, so that the plasticity of the components is damaged and the service life of the components is prolonged. The method can be applied to the modification of the aluminum alloy material with the overproof iron content or a large amount of needle-shaped iron-rich phases.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a scanning electron micrograph of an iron-rich phase provided in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The method for improving the morphology of the needle-like iron-rich phase in the aluminum alloy according to the embodiment of the present invention will be specifically described below.
The method for improving the needle-shaped iron-rich phase form in the aluminum alloy provided by the embodiment of the invention comprises the following steps:
the aluminum alloy material is cast into an aluminum alloy product or blank by a casting method, and the product or blank can be a blank or a product. The invention selects A356 aluminum alloy with iron content of 0.9 wt.% and 6061 aluminum alloy with iron content of 0.6 wt.%, as shown in Table 1:
TABLE 1 composition of aluminum alloy (wt.%)
Processing the area of the aluminum alloy product or the blank to be processed, which needs to be modified, into a plane, and fixing the blank or the member to be modified on the friction stir processing equipment by using a clamp. And installing a stirring head with corresponding size and shape, and performing friction stir processing. The invention controls the organization and the performance of a processing area by adjusting the parameters of the rotating speed of the main shaft, the processing speed, the lapping rate, the processing times, the rotating sequence of the main shaft and the like.
The experimental research of the inventor shows that the rotating speed of a main shaft of the friction stir processing equipment is 500-3000 rpm, and the processing speed is 10-500 mm/min. The overlap ratio of the friction stir processing is 0-100%. The number of times of friction stir processing is 1 to 3. When the friction stir processing equipment is used for processing for multiple times, the rotation sequence of the main shaft is the same rotation direction or the two rotation directions are changed alternately.
In the friction stir processing process, under the combined action of forging force of a shaft shoulder and shearing stress generated by intense stirring of a stirring needle with a thread, thick and needle-shaped iron-rich phases generate stress concentration to bend and break, meanwhile, iron-rich phases which are overlapped or connected mutually collide mutually to break, and the form of the iron-rich phases is changed into a short rod-shaped iron-rich phase with a sharp-angle characteristic from long strips and needles.
After stirring and rubbing, putting the aluminum alloy product or blank into a heat treatment furnace, and preserving heat for 6-50 hours at the temperature of 520-560 ℃. A large number of crystal defects such as dislocation and the like are gathered at a sharp corner of the iron-rich phase subjected to stirring friction, the iron-rich phase belongs to a high-energy micro-region, and elements such as Fe, Si and the like in the iron-rich phase in the region are migrated in the heat treatment process, so that granulation and passivation of the iron-rich phase are promoted. The spherical or nearly spherical iron-rich phase with high sphericity is formed, and the structural uniformity of the aluminum alloy is greatly improved, so that the tensile strength and the elongation of the aluminum alloy are improved.
After the heat treatment is finished, quenching, aging, processing and surface treatment are carried out, and the iron-rich phase is obtained. Quenching, aging, machining and surface treatment in the embodiment of the invention are all general treatment methods in the technical field, the specific process steps are set according to actual needs, and the invention does not limit the process steps.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
This example provides an iron-rich phase, which is prepared by the following method to improve the morphology of needle-like iron-rich phase in aluminum alloy:
and (3) casting the No. 1 aluminum alloy material into an aluminum alloy blank by a casting method.
Processing the area to be modified into a plane, and fixing the blank to be modified on the friction stir processing equipment by using a clamp.
Installing the stirring head with corresponding size and shape, performing friction stir processing, and adjusting processing parameters as follows: the rotating speed of the main shaft is 500rpm, the processing speed is 15mm/min, the lap joint rate is 100 percent, and the processing times are 1.
And after the stirring and rubbing processing is finished, putting the blank into a heat treatment furnace, heating to 540 ℃, and preserving heat for 50 hours.
After the high-temperature heat preservation treatment is finished, quenching, aging, processing and surface treatment are carried out to obtain an iron-rich phase with uniform distribution, small size and high sphericity, and a high-performance aluminum alloy member is prepared.
Example 2
This example provides an iron-rich phase, which is prepared by the following method to improve the morphology of needle-like iron-rich phase in aluminum alloy:
casting the No. 1 aluminum alloy material into an aluminum alloy product by a casting method;
processing the area to be modified into a plane, and fixing the member to be modified on the friction stir processing equipment by using a clamp;
installing the stirring head with corresponding size and shape, performing friction stir processing, and adjusting processing parameters as follows: the rotation speed of the main shaft is 1500rpm, the processing speed is 150mm/min and is 70 percent, the processing times are 2 times, and the main shaft rotates anticlockwise.
After the stirring and rubbing processing is finished, putting the blank into a heat treatment furnace, heating to 560 ℃, and preserving heat for 6 hours;
after the high-temperature heat preservation treatment is finished, quenching, aging, processing and surface treatment are carried out to obtain an iron-rich phase with uniform distribution, small size and high sphericity, and a high-performance aluminum alloy member is prepared.
Example 3
This example provides an iron-rich phase, which is prepared by the following method to improve the morphology of needle-like iron-rich phase in aluminum alloy:
and casting the 2# aluminum alloy material into an aluminum alloy blank by a casting method.
And processing the area to be modified into a plane, and fixing the piece to be modified on the friction stir processing equipment by using a clamp.
Installing the stirring head with corresponding size and shape, performing friction stir processing, and adjusting processing parameters as follows: the rotating speed of the main shaft is 1000rpm, the processing speed is 200mm/min, the lapping rate is 0 percent, the processing times are 2 times, and the rotating direction of the main shaft is firstly anticlockwise and then clockwise.
After the stirring and rubbing processing is finished, the blank is put into a heat treatment furnace, heated to 520 ℃, and kept warm for 12 hours.
After the high-temperature heat preservation treatment is finished, quenching, aging, processing and surface treatment are carried out to obtain an iron-rich phase with uniform distribution, small size and high sphericity, and a high-performance aluminum alloy member is prepared.
Example 4
This example provides an iron-rich phase, which is prepared by the following method to improve the morphology of needle-like iron-rich phase in aluminum alloy:
and casting the 2# aluminum alloy material into an aluminum alloy blank by a casting method.
And processing the area to be modified into a plane, and fixing the piece to be modified on the friction stir processing equipment by using a clamp.
Installing the stirring head with corresponding size and shape, performing friction stir processing, and adjusting processing parameters as follows: the rotating speed of the main shaft is 3000rpm, the processing speed is 500mm/min, the lapping rate is 50 percent, the processing times are 3 times, and the rotating direction of the main shaft is always kept anticlockwise.
And after the stirring and rubbing processing is finished, putting the blank into a heat treatment furnace, heating to 530 ℃, and preserving heat for 20 hours.
After the high-temperature heat preservation treatment is finished, quenching, aging, processing and surface treatment are carried out to obtain an iron-rich phase with uniform distribution, small size and high sphericity, and a high-performance aluminum alloy member is prepared.
Example 5
This example provides an iron-rich phase, which is prepared by the following method to improve the morphology of needle-like iron-rich phase in aluminum alloy:
and casting the 2# aluminum alloy material into an aluminum alloy blank by a casting method.
Processing the area to be modified into a plane, and fixing the blank to be modified on the friction stir processing equipment by using a clamp.
Installing the stirring head with corresponding size and shape, performing friction stir processing, and adjusting processing parameters as follows: the rotating speed of the main shaft is 500rpm, the processing speed is 15mm/min, the lap joint rate is 100 percent, and the processing times are 1.
And after the stirring and rubbing processing is finished, putting the blank into a heat treatment furnace, heating to 540 ℃, and preserving heat for 50 hours.
After the high-temperature heat preservation treatment is finished, quenching, aging, processing and surface treatment are carried out to obtain an iron-rich phase with uniform distribution, small size and high sphericity, and a high-performance aluminum alloy member is prepared.
Comparative example 1
This comparative example provides the iron-rich phase of example 1 without friction stir processing.
Comparative example 2
This comparative example provides the iron-rich phase of example 2 without friction stir processing.
Comparative example 3
This comparative example provides the iron-rich phase of example 3 without friction stir processing.
Comparative example 4
This comparative example provides the iron-rich phase of example 4 without friction stir processing.
Comparative example 5
This comparative example provides the iron-rich phase of example 5 without friction stir processing.
Selecting the iron-rich phases provided by the examples 1-5 and the comparative examples 1-5, and respectively carrying out morphological test and statistics on the iron-rich phases, wherein the results are as follows:
TABLE 2 statistical table of morphological characteristics of iron-rich phase
As is clear from Table 2, in examples 1 to 5, the average length of the iron-rich phase after friction stir reduction was at least 66% and the roundness was at least 310% higher than in comparative examples 1 to 5. Among them, the friction stir processing of the a356 aluminum alloy having 0.9 wt.% of iron content No. 1 is more effective. The average length of the iron-rich phase is reduced by at least 93%, and the roundness is increased by at least 700%. The method for improving the needle-like iron-rich phase morphology in the aluminum alloy provided in examples 1 to 4 has a significant improvement effect. Wherein the average particle size of the iron-rich phase provided in examples 1 to 5 is not more than 5 μm, and the sphericity is not less than 0.75. It is demonstrated that the fine-size, highly spherical iron-rich phase can be obtained by the method of improving the morphology of the acicular iron-rich phase in the aluminum alloy provided in examples 1 to 5.
The microscopic morphology analysis of the iron-rich phase obtained in example 1 is shown in the figure. As can be seen from fig. 1, the iron-rich phase obtained in example 1 was uniformly distributed, fine in size, and high in sphericity.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (2)
1. A method for improving the needle-like iron-rich phase morphology in aluminum alloy is characterized by comprising the following steps:
processing a region of an aluminum alloy product or blank to be processed, which needs to be modified, into a plane, and then fixing the aluminum alloy product or blank to be processed on friction stir processing equipment;
the friction stir processing equipment is adopted to carry out friction stir processing on an aluminum alloy product or blank to be processed, the rotating speed of a main shaft of the friction stir processing equipment is 500-3000 rpm, the processing speed is 10-500 mm/min, the lap joint rate of the friction stir processing is 50-100%, the processing times are 1-3 times, and the rotating sequence of the main shaft is in the same rotating direction when the friction stir processing equipment is used for processing for multiple times;
and (3) preserving the heat of the aluminum alloy product or blank subjected to friction stir processing at 520-560 ℃ for 6-50 hours for heat treatment, and then quenching, aging, processing and surface treatment.
2. The method for improving the morphology of needle-like iron-rich phases in aluminum alloys according to claim 1, characterized in that the aluminum alloy product or blank to be processed is obtained by casting molding by a casting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810754341.6A CN108823516B (en) | 2018-07-10 | 2018-07-10 | Method for improving needle-shaped iron-rich phase form in aluminum alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810754341.6A CN108823516B (en) | 2018-07-10 | 2018-07-10 | Method for improving needle-shaped iron-rich phase form in aluminum alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108823516A CN108823516A (en) | 2018-11-16 |
| CN108823516B true CN108823516B (en) | 2020-01-17 |
Family
ID=64136955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810754341.6A Active CN108823516B (en) | 2018-07-10 | 2018-07-10 | Method for improving needle-shaped iron-rich phase form in aluminum alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108823516B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111690851A (en) * | 2020-08-10 | 2020-09-22 | 广东省材料与加工研究所 | Iron-rich phase reinforced aluminum matrix composite material and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105568036A (en) * | 2015-12-30 | 2016-05-11 | 合肥工业大学 | Preparing method of high-silicon aluminum composite material |
| CN107214231A (en) * | 2017-06-16 | 2017-09-29 | 广东工业大学 | A kind of processing method for improving aluminum alloy plate materials deep drawability |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4033793A (en) * | 1975-09-15 | 1977-07-05 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Aluminium alloys |
-
2018
- 2018-07-10 CN CN201810754341.6A patent/CN108823516B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105568036A (en) * | 2015-12-30 | 2016-05-11 | 合肥工业大学 | Preparing method of high-silicon aluminum composite material |
| CN107214231A (en) * | 2017-06-16 | 2017-09-29 | 广东工业大学 | A kind of processing method for improving aluminum alloy plate materials deep drawability |
Non-Patent Citations (2)
| Title |
|---|
| 压下量及时效对搅拌摩擦加工6061 铝合金组织和力学性能的影响;李亨等;《材料热处理学报》;20180430;第39卷(第4期);第63-69页 * |
| 搅拌摩擦加工对过共晶Al-Si-Fe合金组织及性能的影响;陆常翁等;《材料导报B：研究篇》;20140330;第28卷(第3期);第107-110页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108823516A (en) | 2018-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Skryabin et al. | Investigation of the effect of thin films of aluminum nitride on the stone-like destruction of cast steel | |
| Wang et al. | La2O3 effects on TZM alloy recovery, recrystallization and mechanical properties | |
| Zhang et al. | Grain refining performance for Al and Al–Si alloy casts by addition of equal-channel angular pressed Al–5 mass% Ti alloy | |
| CN110438387B (en) | Silicide precipitation strengthening refractory high-entropy alloy and preparation method thereof | |
| TW201936939A (en) | Metal wire, saw wire, cutting apparatus, and method of manufacturing metal wire | |
| CN108823516B (en) | Method for improving needle-shaped iron-rich phase form in aluminum alloy | |
| CN113604695B (en) | Method for optimizing additive manufacturing of titanium alloy structure by adding rare earth alloy | |
| Nie et al. | Microstructure and tensile properties of SiC nanoparticles reinforced magnesium matrix composite prepared by multidirectional forging under decreasing temperature conditions | |
| Demakov et al. | Effect of annealing temperature on the texture of copper wire | |
| CN111074131B (en) | Thermal mechanical treatment method of eutectic high-entropy alloy | |
| Zhang et al. | Effect of duplex aging on microstructure and mechanical properties of near-β titanium alloy processed by isothermal multidirectional forging | |
| CN108913959B (en) | Plastic processing method for improving iron-rich phase form in aluminum alloy | |
| CN109207826B (en) | Deformation-resistant tungsten plate and preparation method thereof | |
| Sheng et al. | Microstructure evolution of Al–Sr master alloy during continuous extrusion | |
| Cao et al. | Tensile behavior of cast γ-TiAl alloys with varied boride morphologies | |
| CN113936880B (en) | High-strength R-T-B rare earth permanent magnet and preparation method thereof | |
| CN111155060A (en) | Method for manufacturing cobalt target blank | |
| CN113528992B (en) | Heat treatment method for optimizing mechanical properties of GH3536 nickel-based high-temperature alloy manufactured by additive manufacturing | |
| Su et al. | Effect of heat treatment on microstructures and mechanical properties in a full lamellar PM TiAl alloy | |
| CN110607487B (en) | ODS-Fe3Al alloy, alloy product and preparation method thereof | |
| Chang et al. | Modification Mechanism and Uniaxial Fatigue Performances of A356. 2 Alloy Treated by Al-Sr-La Composite Refinement-Modification Agent | |
| Akama et al. | Aging Behavior of Ultrafine-Grained Al–Mg–Si–X (X= Cu, Ag, Pt, Pd) Alloys Produced by High-Pressure Torsion | |
| Ma et al. | Influence of 2D forging processes and boron contents on the microstructures and mechanical properties of near α titanium alloys | |
| Koprowski et al. | Thermal stability of AA1050 aluminum alloy after equal channel angular pressing | |
| CN115992329B (en) | Tungsten rod blank and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510000 363 Changxin Road, Tianhe District, Guangzhou, Guangdong. Patentee after: Institute of materials and processing, Guangdong Academy of Sciences Address before: 510000 363 Changxin Road, Tianhe District, Guangzhou, Guangdong. Patentee before: Guangdong Institute Of Materials And Processing |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221111 Address after: 510651 No. 363, Changxin Road, Guangzhou, Guangdong, Tianhe District Patentee after: Institute of new materials, Guangdong Academy of Sciences Address before: 510000 363 Changxin Road, Tianhe District, Guangzhou, Guangdong. Patentee before: Institute of materials and processing, Guangdong Academy of Sciences |