CN113235027B - Deformed magnesium alloy plate with good matching of strength and plasticity and preparation method thereof - Google Patents
Deformed magnesium alloy plate with good matching of strength and plasticity and preparation method thereof Download PDFInfo
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- CN113235027B CN113235027B CN202110557808.XA CN202110557808A CN113235027B CN 113235027 B CN113235027 B CN 113235027B CN 202110557808 A CN202110557808 A CN 202110557808A CN 113235027 B CN113235027 B CN 113235027B
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- 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
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
Abstract
The invention discloses a wrought magnesium alloy plate with good matching of strength and plasticity and a preparation method thereof, wherein the preparation method comprises the following steps: s1, carrying out cryogenic treatment, low-speed rolling and annealing, carrying out cryogenic treatment on the deformed magnesium alloy plate with the non-basal plane texture for 0.5-2 h, carrying out low-speed rolling after the cryogenic treatment is finished, then placing the plate in air to naturally recover to room temperature, and then carrying out recovery annealing treatment and quenching; and S2, carrying out cryogenic treatment, high-speed rolling and annealing, carrying out cryogenic treatment on the deformed magnesium alloy plate subjected to the treatment of S1 for 0.5-2 h, carrying out high-speed rolling after the cryogenic treatment is finished, naturally recovering the deformed magnesium alloy plate to room temperature in the air, carrying out recovery annealing treatment, and quenching to obtain the deformed magnesium alloy plate with good strength and plasticity matching. The method can keep the non-basal plane texture characteristics of the deformed magnesium alloy plate, and simultaneously realize the obvious improvement of the strength by introducing a large number of mutually parallel or crossed {10-12} stretching twin crystals into the plate, thereby finally realizing the good matching of the strength and the plasticity of the non-basal plane texture deformed magnesium alloy plate.
Description
Technical Field
The invention relates to the technical field of metal plate rolling, in particular to a deformed magnesium alloy plate with good matching of strength and plasticity and a preparation method thereof.
Background
Under the large background that the light weight of the component is realized to realize the low emission of carbon dioxide, the deformed magnesium alloy plate with low density, high specific strength and specific stiffness has huge market demand and application prospect in the fields of automobile industry and aerospace. However, the independent slip system of the wrought magnesium alloy plate at room temperature is limited due to the close-packed hexagonal crystal structure of the wrought magnesium alloy plate, so that the wrought magnesium alloy plate has poor room-temperature plastic deformation capability. In addition, the deformed magnesium alloy plate is easy to form a strong basal plane texture in the processing and preparation process, so that the subsequent forming and processing are difficult, and the large-scale application of the deformed magnesium alloy plate is restricted. Therefore, the weak/non-basal surface texture of the deformed magnesium alloy plate is realized by texture regulation and control, and is an important means for improving the room-temperature plastic deformation capability of the deformed magnesium alloy plate.
A new process for regulating magnesium alloy sheet texture of equal-radius angle rolling-continuous bending-annealing (ECAR-CB-A) was developed by Jianan Tu et al in "efficiency of rolling specifications on texture modification and mechanical properties of the AZ31 sheet by a combination of equal-radius angle rolling and continuous bending at high temperature, Journal of alloy and Compound", and succeeded in preparing a very rare special bimodal separated non-base texture in AZ31 magnesium alloy sheet, which is deflected by about 45 degrees from ND to RD. The room temperature IE value of the AZ31 magnesium alloy plate with the special texture reaches 7.4mm, reaches the international first-class level, and is expected to break through the bottleneck of the traditional magnesium alloy plate in the aspect of room temperature plastic forming. However, the research of Denghui Song et al in "Denghui Song et al, Improved stretch format of AZ31 sheet via texture control by inner reducing a connecting channel in an equal channel and rolling, Journal of Materials Processing Technology" shows that the special non-base texture AZ31 magnesium alloy plate prepared by the ECAR-CB-A process shows a remarkable strength reduction phenomenon in mechanical properties, and the yield strength of the plate when the plate is stretched in the rolling direction RD is only about 74MPa, which is obviously lower than that of the commonly used base texture AZ31 magnesium alloy plate.
As is well known, the reduction of the strength of the magnesium alloy sheet restricts the application range of the formed part, which means that although the special non-basal plane texture can significantly improve the room-temperature plastic deformation capability of the sheet and basically eliminate the adverse effect of the basal plane texture on the room-temperature plastic deformation capability of the sheet, if the strength of the sheet cannot be effectively improved, a high-performance magnesium alloy sheet with matched strength and plasticity cannot be prepared, and further, the requirement of industrial application cannot be met.
Disclosure of Invention
The invention aims to provide a wrought magnesium alloy plate with good matching between strength and plasticity and a preparation method thereof, which can realize the obvious improvement of the strength by introducing a large amount of mutually parallel or crossed {10-12} tensile twin crystals into the plate while keeping the non-basal plane texture characteristics of the wrought magnesium alloy plate, and finally realize the good matching between the strength and the plasticity of the non-basal plane texture wrought magnesium alloy plate.
The preparation method of the wrought magnesium alloy plate with good matching of strength and plasticity comprises the following steps:
s1, carrying out cryogenic treatment, low-speed rolling and annealing;
s11, carrying out subzero treatment on the deformed magnesium alloy plate with the non-basal plane texture for 0.5-2 h;
s12, carrying out low-speed rolling after the cryogenic treatment, wherein the rolling deformation is 2.5-5%, and the rolling speed is 0.1-0.5 m/S;
s13, placing the steel plate in the air to naturally return to the room temperature, then carrying out recovery annealing treatment and quenching;
s2, carrying out cryogenic treatment, high-speed rolling and annealing;
s21, carrying out subzero treatment on the deformed magnesium alloy plate processed by the S1 for 0.5-2 h;
s22, carrying out high-speed rolling after the cryogenic treatment, wherein the rolling deformation is 2.5-5%, and the rolling speed is 5-10 m/S;
and S23, placing the magnesium alloy plate in the air to naturally return to the room temperature, then carrying out recovery annealing treatment and quenching to obtain the deformed magnesium alloy plate with good matching of strength and plasticity.
Further, the cryogenic treatment of S11 and S21 is carried out by placing the wrought magnesium alloy plate in a liquid nitrogen environment.
Further, the annealing temperature of the recovery annealing treatment in the S13 is 80-120 ℃, and the annealing heat preservation time is 0.5-1 h.
Further, the annealing temperature of the recovery annealing treatment in the S23 is 140-180 ℃, and the annealing heat preservation time is 0.5-2 h.
The deformed magnesium alloy sheet material with good matching of strength and plasticity is prepared by the method.
Compared with the prior art, the invention has the following beneficial effects.
1. According to the invention, a large amount of dislocation motions are activated in the deformed magnesium alloy plate with the non-basal plane texture through cryogenic treatment and low-speed rolling, and a large amount of dislocation substructures are introduced into the deformed magnesium alloy plate in cooperation with subsequent annealing treatment, so that more nucleation sites are provided for the introduction of {10-12} stretching twin crystals. Then, by deep cooling treatment and high-speed rolling, a large number of mutually parallel or crossed {10-12} stretching twin crystals are introduced while dislocation motion is effectively inhibited, and subsequent annealing treatment is matched, so that the dislocation density is remarkably reduced under the condition of ensuring no crystal grain recrystallization, and finally the non-basal texture deformed magnesium alloy plate containing a large number of mutually parallel or crossed {10-12} stretching twin crystals is obtained. By introducing a large number of mutually parallel or crossed {10-12} stretching twin crystals, the stretching yield stress of the non-basal texture deformed magnesium alloy plate along the RD direction is improved, meanwhile, the plasticity performance is not obviously changed, and the good matching of the strength and the plasticity of the non-basal texture deformed magnesium alloy plate is realized.
2. The method adopts liquid nitrogen to carry out cryogenic treatment on the magnesium alloy plate, the liquid nitrogen is a byproduct in the oxygen generation industry, and has the advantages of low price, wide raw material source, energy conservation, easy storage and transportation, stable chemical performance, no toxicity, no pollution and extremely low cost compared with the conventional heat treatment.
3. The invention can realize low-speed rolling and high-speed rolling by adopting a common rolling mill, has simple and safe operation and is beneficial to large-scale industrial application.
Drawings
FIG. 1 is a microscopic morphology of a wrought magnesium alloy plate with good strength and plasticity matching according to the present invention;
FIG. 2 is a schematic texture diagram of a wrought magnesium alloy plate with a good strength and plasticity match according to the present invention;
FIG. 3 is a mechanical behavior diagram of a wrought magnesium alloy sheet material with good matching between strength and plasticity according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The first embodiment is a method for preparing a wrought magnesium alloy plate with good matching of strength and plasticity, which comprises the following steps:
s1, carrying out cryogenic treatment, low-speed rolling and annealing;
s11, placing the non-basal texture AZ31 magnesium alloy plate in a liquid nitrogen environment for cryogenic treatment for 0.5h, wherein the initial thickness of the non-basal texture AZ31 magnesium alloy plate is 1.2 mm;
s12, immediately carrying out low-speed rolling on the plate after the cryogenic treatment, wherein the rolling deformation is 3%, and the rolling speed is 0.2 m/S;
and S13, placing the steel plate in the air to naturally recover to room temperature, then carrying out recovery annealing treatment, wherein the annealing temperature is 85 ℃, the annealing heat preservation time is 0.5h, and quenching. By means of cryogenic treatment and low-speed rolling, a large amount of dislocation motion is activated in the deformed magnesium alloy plate with the non-basal plane texture, subsequent recovery annealing treatment is matched, a large amount of dislocation substructures are introduced into the deformed magnesium alloy plate, and more nucleation sites are provided for introduction of {10-12} stretching twin crystals.
S2, carrying out cryogenic treatment, high-speed rolling and annealing;
s21, placing the AZ31 magnesium alloy plate processed by the S1 in a liquid nitrogen environment for cryogenic treatment for 0.5 h;
s22, immediately carrying out high-speed rolling on the plate after the cryogenic treatment, wherein the rolling deformation is 3%, and the rolling speed is 5 m/S;
s23, placing the alloy plate in the air to naturally recover to room temperature, then carrying out recovery annealing treatment at the annealing temperature of 140 ℃ for 1h, and quenching to obtain the AZ31 magnesium alloy plate with good matching of strength and plasticity. By means of deep cooling treatment and high-speed rolling, a large number of mutually parallel or crossed {10-12} stretching twin crystals are introduced while dislocation movement is effectively inhibited, subsequent annealing treatment is matched, dislocation density is remarkably reduced under the condition that no crystal grain recrystallization occurs, and finally the non-basal texture deformed magnesium alloy plate containing a large number of mutually parallel or crossed {10-12} stretching twin crystals is obtained. By introducing a large number of mutually parallel or crossed {10-12} stretching twin crystals, the tensile yield stress of the non-basal texture deformed magnesium alloy plate in the RD direction is improved, meanwhile, the plasticity performance is not obviously changed, and the good matching of the strength and the plasticity of the non-basal texture deformed magnesium alloy plate is realized.
Referring to FIG. 1, microscopic morphology observation is carried out on the AZ31 magnesium alloy sheet material with good matching of strength and plasticity, crystal grains still present isometric crystal characteristics in the sheet material, and simultaneously, a large number of {10-12} tensile twin crystals which are parallel or crossed with each other appear in the crystal grains.
Referring to fig. 2, the texture characteristics of the AZ31 magnesium alloy sheet with good matching strength and plasticity were observed, and the sheet still exhibited the typical bimodal separation special non-basal plane texture characteristics.
And (3) analyzing the mechanical properties of the prepared AZ31 magnesium alloy plate with good matching strength and plasticity, and taking a basal texture AZ31 magnesium alloy plate and a non-basal texture AZ31 magnesium alloy plate as comparative examples. Referring to fig. 3, compared with the comparative example, the strength index of the plate prepared in the first example is significantly improved, the tensile yield strength stress in the RD direction is up to about 175MPa, the plasticity index is not significantly changed, the breaking elongation in the RD direction is about 18%, and the good matching of the strength and the plasticity of the non-basal texture deformed magnesium alloy plate is realized.
In a second embodiment, a method for manufacturing a wrought magnesium alloy plate with good matching between strength and plasticity comprises the following steps:
s1, carrying out cryogenic treatment, low-speed rolling and annealing;
s11, placing the non-basal texture AZ61 magnesium alloy plate in a liquid nitrogen environment for subzero treatment for 1h, wherein the initial thickness of the non-basal texture AZ61 magnesium alloy plate is 2.5 mm;
s12, immediately carrying out low-speed rolling on the plate after the cryogenic treatment, wherein the rolling deformation is 4%, and the rolling speed is 0.4 m/S;
s13, placing the steel plate in the air to naturally return to the room temperature, then carrying out recovery annealing treatment, wherein the annealing temperature is 100 ℃, the annealing heat preservation time is 1h, and quenching.
S2, carrying out cryogenic treatment, high-speed rolling and annealing;
s21, placing the AZ61 magnesium alloy plate processed by the S1 in a liquid nitrogen environment for subzero treatment for 1 h;
s22, immediately carrying out high-speed rolling on the plate after the cryogenic treatment, wherein the rolling deformation is 4%, and the rolling speed is 7 m/S;
s23, placing the alloy plate in the air to naturally recover to room temperature, then carrying out recovery annealing treatment, wherein the annealing temperature is 170 ℃, the annealing heat preservation time is 1h, and quenching to obtain the AZ61 magnesium alloy plate with good matching of strength and plasticity.
EBSD characterization analysis is carried out on the prepared AZ61 magnesium alloy plate, while the characteristic of typical double-peak separated special non-basal plane texture is maintained, a large number of mutually parallel or crossed {10-12} stretching twin crystals also exist in the crystal grains, the RD direction stretching yield stress is successfully increased from about 135MPa to about 263MPa through the preparation method, the RD direction breaking elongation is not significantly changed and is about 15%, and the purpose of good matching of the strength and the plasticity of the non-basal plane texture deformed magnesium alloy plate is successfully achieved.
Claims (3)
1. The preparation method of the deformed magnesium alloy plate with good matching of strength and plasticity is characterized by comprising the following steps:
s1, carrying out cryogenic treatment, low-speed rolling and annealing;
s11, carrying out subzero treatment on the deformed magnesium alloy plate with the non-basal plane texture for 0.5-2 h;
s12, carrying out low-speed rolling after the cryogenic treatment, wherein the rolling deformation is 2.5-5%, and the rolling speed is 0.1-0.5 m/S;
s13, placing the steel plate in air to naturally recover to room temperature, then carrying out recovery annealing treatment, wherein the annealing temperature of the recovery annealing treatment is 80-120 ℃, the annealing heat preservation time is 0.5-1 h, and quenching;
s2, carrying out cryogenic treatment, high-speed rolling and annealing;
s21, carrying out subzero treatment on the deformed magnesium alloy plate processed by the S1 for 0.5-2 h;
s22, carrying out high-speed rolling after the cryogenic treatment, wherein the rolling deformation is 2.5-5%, and the rolling speed is 5-10 m/S;
s23, placing the magnesium alloy plate in the air to naturally recover to room temperature, then carrying out recovery annealing treatment, wherein the annealing temperature of the recovery annealing treatment is 140-180 ℃, the annealing heat preservation time is 0.5-2 h, and quenching to obtain the deformed magnesium alloy plate with good matching of strength and plasticity.
2. The method for preparing a wrought magnesium alloy plate with good matching of strength and plasticity according to claim 1, wherein the method comprises the following steps: the subzero treatment of S11 and S21 is carried out by placing the deformed magnesium alloy plate in a liquid nitrogen environment.
3. A wrought magnesium alloy sheet with good matching of strength and plasticity prepared by the method of claim 1 or 2.
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| CN113943907B (en) * | 2021-10-14 | 2022-03-25 | 安徽工业大学 | Preparation method of magnesium alloy plate strip with gradient heterogeneous structure |
| CN115896655A (en) * | 2022-11-15 | 2023-04-04 | 重庆理工大学 | Multi-element blending structure deformation magnesium alloy plate and preparation method thereof |
| CN115747690A (en) * | 2022-11-29 | 2023-03-07 | 西安交通大学 | Preparation method of close-packed hexagonal metal material containing ultrahigh-density twin crystals |
| CN115742485A (en) * | 2022-11-29 | 2023-03-07 | 重庆理工大学 | Boron carbide reinforced Mg-Al-Ta layered composite board and preparation method thereof |
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