CN112877619A - High tensile strength (CoCrNi) Al3Ti3Preparation method of medium-entropy alloy - Google Patents
High tensile strength (CoCrNi) Al3Ti3Preparation method of medium-entropy alloy Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 65
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- 238000005096 rolling process Methods 0.000 claims abstract description 35
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- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 15
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005097 cold rolling Methods 0.000 claims abstract description 12
- 238000005098 hot rolling Methods 0.000 claims abstract description 12
- 230000032683 aging Effects 0.000 claims abstract description 9
- 238000000265 homogenisation Methods 0.000 claims abstract description 9
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- 230000001276 controlling effect Effects 0.000 abstract 2
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Abstract
The invention discloses (CoCrNi) Al with the tensile strength of 2GPa3Ti3The preparation method of the medium entropy alloy comprises the steps of firstly selecting (CoCrNi) Al3Ti3Medium-entropy alloy hot rolled plate; carrying out homogenization treatment on the hot rolled plate, then carrying out hot rolling again, and cooling to room temperature after rolling to a target thickness; cold rolling the air-cooled plate to a target thickness at room temperature; keeping the temperature of the cold-rolled sheet at a target temperature in a furnace-entering mode to finish annealing, and then performing water quenching to room temperature; and (3) preserving the heat of the annealed plate at the target temperature in a manner of entering the plate into the furnace at the warm temperature, finishing aging heat treatment, and then performing water quenching to room temperature to obtain the medium-entropy alloy with the tensile strength of 2 GPa. According to the invention, by controlling the rolling and heat treatment process parameters and reasonably regulating and controlling the internal structure form of the alloy, the prepared medium-entropy alloy has the advantage of ultrahigh tensile strength, and provides a mechanical property guarantee for the application of the medium-entropy alloy in a high-strength service environment.
Description
Technical Field
The invention relates to the technical field of alloy plate processing, in particular to (CoCrNi) Al with the tensile strength of 2GPa3Ti3A preparation method of the medium entropy alloy.
Background
As is well known, materials are the 'carriers' of scientific products, with the development of society and the advancement of science, the requirements for the materials are higher and higher, and various novel materials are produced. The medium-high entropy alloy is a "newborn" in the field of metal materials in recent years, and the CoCrNi system medium-entropy alloy is a typical representative and is widely noticed by material researchers. The high-temperature-resistant high. However, since the birth of entropy alloys in the CoCrNi system, the plasticity and toughness are always the focus of research, and the research and development on the strength of the alloy are less. So that the application potential of the alloy in a high-strength service environment is limited, which is obviously a waste for the comprehensive performance advantages of the alloy in other aspects.
The concept that the CoCrNi ternary medium entropy alloy is in a single-phase face-centered cubic structure, the CoCrNi medium entropy alloy with the equal atomic ratio is taken as a matrix, and other alloy elements are added into the matrix to realize precipitation strengthening is feasible. At present, Al and Ti are added into the alloy to introduce L12It is an effective way to achieve precipitation strengthening of coherent structural phases, and therefore, in this study, (CoCrNi) Al3Ti3It is very meaningful to research the rolling and heat treatment process parameters of the medium-entropy alloy to achieve the maximum strengthening effect.
Disclosure of Invention
The invention aims to provide (CoCrNi) Al with the tensile strength of 2GPa3Ti3The preparation method of the medium-entropy alloy is based on the concepts of deformation strengthening, fine-grain strengthening and precipitation strengthening, and the CoCrNi-based medium-entropy alloy with high tensile strength is obtained by controlling the technological parameters of rolling and heat treatment.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention discloses (CoCrNi) Al with the tensile strength of 2GPa3Ti3The preparation method of the medium-entropy alloy comprises the following steps:
the method comprises the following steps: selecting (CoCrNi) Al3Ti3Carrying out homogenization annealing treatment on the medium-entropy alloy hot rolled plate;
step two: hot rolling the plate subjected to the homogenizing annealing treatment again, wherein the total reduction is 50-70%, and then air cooling to room temperature;
step three: cold rolling a hot rolled plate at room temperature, wherein the total reduction is 60-75%;
step four: placing the cold-rolled sheet into a heating furnace in a warm-in-furnace mode, preserving heat for a period of time, annealing, and then performing water quenching to room temperature;
step five: and putting the annealed plate into a heating furnace in a manner of entering the heating furnace at a warm temperature for heat preservation for a period of time, carrying out aging treatment, and then carrying out water quenching to room temperature.
Wherein the content of the first and second substances,
the homogenizing annealing temperature in the step one is 1150-1200 ℃, the heat preservation time is 2-6 h, and the cooling mode is air cooling.
And step two, the hot rolling initial rolling temperature is 1100-1150 ℃, the final rolling temperature is 950-1000 ℃, the rolling reduction is divided into 2 passes, and the reduction of each pass is 25-35%.
And thirdly, cold rolling is divided into 3 passes, and the reduction of each pass is 20-25%.
And fourthly, the annealing temperature is 800 ℃, and the heat preservation time is 1-2 h.
And fifthly, the aging treatment temperature is 600-700 ℃, and the heat preservation time is 4-8 h.
The invention has the beneficial effects that the grain size, the content and the appearance of the educt are reasonably controlled by simple rolling and heat treatment processes, and the (CoCrNi) Al is obviously improved3Ti3The tensile strength of the medium-entropy alloy promotes the application of the CoCrNi alloy in a high-strength service environment.
Drawings
FIG. 1 shows cold rolled (CoCrNi) Al provided in example 13Ti3Drawing plots of medium entropy alloys.
FIG. 2 shows (CoCrNi) Al prepared by the preparation method of 800 ℃ aging treatment provided in example 23Ti3Drawing plots of medium entropy alloys.
FIG. 3 shows a composition of (CoCrNi) Al with a tensile strength of 2GPa, according to example 3 of the present invention3Ti3A drawing curve diagram of the medium-entropy alloy prepared by the preparation method of the medium-entropy alloy.
FIG. 4 shows a composition of (CoCrNi) Al with a tensile strength of 2GPa, according to example 4 of the present invention3Ti3A drawing curve diagram of the medium-entropy alloy prepared by the preparation method of the medium-entropy alloy.
FIG. 5 shows a composition of (CoCrNi) Al with a tensile strength of 2GPa, according to example 5 of the present invention3Ti3A drawing curve diagram of the medium-entropy alloy prepared by the preparation method of the medium-entropy alloy.
Detailed Description
The invention discloses (CoCrNi) Al with the tensile strength of 2GPa3Ti3The preparation method of the medium-entropy alloy comprises the following steps:
the method comprises the following steps: selecting (CoCrNi) Al3Ti3Carrying out homogenization annealing treatment on the medium-entropy alloy hot rolled plate;
step two: hot rolling the plate subjected to the homogenizing annealing treatment again, wherein the total reduction is 50-70%, and then air cooling to room temperature;
step three: cold rolling a hot rolled plate at room temperature, wherein the total reduction is 60-75%;
step four: placing the cold-rolled sheet into a heating furnace in a warm-in-furnace mode, preserving heat for a period of time, annealing, and then performing water quenching to room temperature;
step five: and putting the annealed plate into a heating furnace in a manner of entering the heating furnace at a warm temperature for heat preservation for a period of time, carrying out aging treatment, and then carrying out water quenching to room temperature.
Wherein the content of the first and second substances,
the homogenizing annealing temperature in the step one is 1150-1200 ℃, the heat preservation time is 2-6 h, and the cooling mode is air cooling.
And step two, the hot rolling initial rolling temperature is 1100-1150 ℃, the final rolling temperature is 950-1000 ℃, the rolling reduction is divided into 2 passes, and the reduction of each pass is 25-35%.
And thirdly, cold rolling is divided into 3 passes, and the reduction of each pass is 20-25%.
And fourthly, the annealing temperature is 800 ℃, and the heat preservation time is 1-2 h.
And fifthly, the aging treatment temperature is 600-700 ℃, and the heat preservation time is 4-8 h.
Example 1
1) Selecting (CoCrNi) Al with the thickness of 10mm3Ti3And (3) carrying out homogenizing annealing on the medium-entropy alloy hot rolled plate, namely putting the hot rolled plate into a heating furnace for 2h at the annealing temperature of 1200 ℃, and then carrying out air cooling to room temperature.
2) And (3) hot rolling the plate after the homogenization annealing again, wherein the initial rolling temperature is 1100 ℃, the final rolling temperature is 980 ℃, the total deformation is 50%, the rolling is divided into 2 passes, the reduction of each pass is 25%, the plate is rolled to the thickness of 5mm, and then the plate is air-cooled to the room temperature.
3) And (3) cold rolling a hot rolled plate with the thickness of 5mm to the thickness of 2mm, wherein the total deformation is 60%, the rolling reduction of each pass is 20%, and the total deformation is divided into 3 passes.
The tensile test is that the experimental alloy is processed into a tensile sample with the gauge length of 25mm and the gauge width of 6mm by adopting the standard of ASTM E8/E8M-2013a, and the tensile test is carried out on a UTM5305 electronic universal tester at room temperature, and the tensile speed is 2 mm/min. The tensile test results are shown in FIG. 1, cold rolled (CoCrNi) Al3Ti3The tensile strength of the medium-entropy alloy plate sample is only 1805 MPa.
Example 2
1) Selecting (CoCrNi) Al with the thickness of 10mm3Ti3And (3) carrying out homogenizing annealing on the medium-entropy alloy hot rolled plate, namely putting the hot rolled plate into a heating furnace for 2h at the annealing temperature of 1200 ℃, and then carrying out air cooling to room temperature.
2) And (3) hot rolling the plate after the homogenization annealing again, wherein the initial rolling temperature is 1100 ℃, the final rolling temperature is 980 ℃, the total deformation is 50%, the rolling is divided into 2 passes, the reduction of each pass is 25%, the plate is rolled to the thickness of 5mm, and then the plate is air-cooled to the room temperature.
3) And (3) cold rolling a hot rolled plate with the thickness of 5mm to the thickness of 2mm, wherein the total deformation is 60%, the rolling reduction of each pass is 20%, and the total deformation is divided into 3 passes.
4) The furnace temperature of the box-type resistance furnace is firstly raised to 800 ℃, then the cold-rolled sheet is put into the furnace for aging treatment, the heat preservation time is 8 hours, and then the water quenching is carried out to the room temperature.
The tensile test is that the experimental alloy is processed into a tensile sample with the gauge length of 25mm and the gauge width of 6mm by adopting the standard of ASTM E8/E8M-2013a, and the tensile test is carried out on a UTM5305 electronic universal tester at room temperature, and the tensile speed is 2 mm/min. The tensile test results are shown in FIG. 2, and (CoCrNi) Al after aging treatment by holding at 800 ℃ for 8h after rolling3Ti3The tensile strength of the medium entropy alloy is 1536 MPa.
Example 3
1) Selecting (CoCrNi) Al with the thickness of 10mm3Ti3And (3) carrying out homogenizing annealing on the medium-entropy alloy hot rolled plate, namely putting the hot rolled plate into a heating furnace for 2h at the annealing temperature of 1200 ℃, and then carrying out air cooling to room temperature.
2) And (3) hot rolling the plate after the homogenization annealing again, wherein the initial rolling temperature is 1100 ℃, the final rolling temperature is 980 ℃, the total deformation is 50%, the rolling is divided into 2 passes, the reduction of each pass is 25%, the plate is rolled to the thickness of 5mm, and then the plate is air-cooled to the room temperature.
3) And (3) cold rolling a hot rolled plate with the thickness of 5mm to the thickness of 2mm, wherein the total deformation is 60%, the rolling reduction of each pass is 20%, and the total deformation is divided into 3 passes.
4) The furnace temperature of the box-type resistance furnace is firstly raised to 800 ℃, then the cold-rolled sheet is put into the furnace for annealing treatment, the heat preservation time is 1h, and then the water quenching is carried out to the room temperature.
5) The furnace temperature of the box-type resistance furnace is firstly increased to 700 ℃, then the annealed plate is put into the furnace for aging treatment, the heat preservation time is 4 hours, and then the ultrahigh tensile strength entropy alloy can be obtained by water quenching to the room temperature.
Tensile test for the experimental alloy a tensile test specimen with a gauge length of 25mm and a gauge width of 6mm was processed using ASTM E8/E8M-2013a standard and subjected to UTM5The room temperature tensile test was carried out in a 305 electronic universal tester at a tensile rate of 2 mm/min. The tensile test results are shown in figure 3, and the (CoCrNi) Al is rolled, annealed at 800 ℃ for 1h, and aged at 700 ℃ for 4h3Ti3The tensile strength of the medium-entropy alloy is 2100 MPa. Compared with examples 1 and 2, the invention is shown to effectively improve (CoCrNi) Al3Ti3Tensile strength of the medium entropy alloy.
Example 4
1) Selecting (CoCrNi) Al with the thickness of 10mm3Ti3And (3) carrying out homogenizing annealing on the medium-entropy alloy hot rolled plate, namely putting the hot rolled plate into a heating furnace for 2h at the annealing temperature of 1200 ℃, and then carrying out air cooling to room temperature.
2) And (3) hot rolling the plate after the homogenization annealing again, wherein the initial rolling temperature is 1100 ℃, the final rolling temperature is 980 ℃, the total deformation is 50%, the rolling is divided into 2 passes, the reduction of each pass is 25%, the plate is rolled to the thickness of 5mm, and then the plate is air-cooled to the room temperature.
3) And (3) cold rolling a hot rolled plate with the thickness of 5mm to the thickness of 2mm, wherein the total deformation is 60%, the rolling reduction of each pass is 20%, and the total deformation is divided into 3 passes.
4) The furnace temperature of the box-type resistance furnace is firstly raised to 800 ℃, then the cold-rolled sheet is put into the furnace for annealing treatment, the heat preservation time is 1h, and then the water quenching is carried out to the room temperature.
5) The temperature of a box-type resistance furnace is firstly raised to 600 ℃, then the annealed plate is put into the furnace for aging treatment, the heat preservation time is 8 hours, and then water quenching is carried out to the room temperature, so as to obtain the ultrahigh tensile strength entropy alloy.
The tensile test is that the experimental alloy is processed into a tensile sample with the gauge length of 25mm and the gauge width of 6mm by adopting the standard of ASTM E8/E8M-2013a, and the tensile test is carried out on a UTM5305 electronic universal tester at room temperature, and the tensile speed is 2 mm/min. The tensile test results are shown in figure 4, and the (CoCrNi) Al is rolled, annealed at 800 ℃ for 1h, and aged at 600 ℃ for 8h3Ti3The tensile strength of the medium entropy alloy is 2158 MPa. Compared with examples 1 and 2, the invention is shown to effectively improve (CoCrNi) Al3Ti3Tensile strength of the medium entropy alloy.
Example 5
1) Selecting (CoCrNi) Al with the thickness of 10mm3Ti3And (3) carrying out homogenizing annealing on the medium-entropy alloy hot rolled plate, namely putting the hot rolled plate into a heating furnace for 2h at the annealing temperature of 1200 ℃, and then carrying out air cooling to room temperature.
2) And (3) hot rolling the plate after the homogenization annealing again, wherein the initial rolling temperature is 1100 ℃, the final rolling temperature is 980 ℃, the total deformation is 50%, the rolling is divided into 2 passes, the reduction of each pass is 25%, the plate is rolled to the thickness of 5mm, and then the plate is air-cooled to the room temperature.
3) And (3) cold rolling a hot rolled plate with the thickness of 5mm to the thickness of 2mm, wherein the total deformation is 60%, the rolling reduction of each pass is 20%, and the total deformation is divided into 3 passes.
4) The furnace temperature of the box-type resistance furnace is firstly raised to 800 ℃, then the cold-rolled sheet is put into the furnace for annealing treatment, the heat preservation time is 1h, and then the water quenching is carried out to the room temperature.
5) The furnace temperature of the box-type resistance furnace is firstly increased to 650 ℃, then the annealed plate is put into the furnace for aging treatment, the heat preservation time is 6h, and then the ultrahigh tensile strength entropy alloy can be obtained by water quenching to the room temperature.
The tensile test is that the experimental alloy is processed into a tensile sample with the gauge length of 25mm and the gauge width of 6mm by adopting the standard of ASTM E8/E8M-2013a, and the tensile test is carried out on a UTM5305 electronic universal tester at room temperature, and the tensile speed is 2 mm/min. The tensile test results are shown in figure 4, and the (CoCrNi) Al is rolled, annealed at 800 ℃ for 1h, and aged at 650 ℃ for 6h3Ti3The tensile strength of the medium entropy alloy is 2066 MPa. Compared with examples 1 and 2, the invention is shown to effectively improve (CoCrNi) Al3Ti3Tensile strength of the medium entropy alloy.
The foregoing is merely to aid in understanding the invention and is not to be construed as limiting thereof. It will be obvious to those skilled in the art that various changes and equivalents may be made without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. (CoCrNi) Al with tensile strength of 2GPa3Ti3The preparation method of the medium entropy alloy is characterized by comprising the following steps:
the method comprises the following steps: selecting (CoCrNi) Al3Ti3Carrying out homogenization annealing treatment on the medium-entropy alloy hot rolled plate;
step two: hot rolling the plate subjected to the homogenizing annealing treatment again, wherein the total reduction is 50-70%, and then air cooling to room temperature;
step three: cold rolling a hot rolled plate at room temperature, wherein the total reduction is 60-75%;
step four: placing the cold-rolled sheet into a heating furnace in a warm-in-furnace mode, preserving heat for a period of time, annealing, and then performing water quenching to room temperature;
step five: and putting the annealed plate into a heating furnace in a manner of entering the heating furnace at a warm temperature for heat preservation for a period of time, carrying out aging treatment, and then carrying out water quenching to room temperature.
2. A (CoCrNi) Al according to claim 1 having a tensile strength of up to 2GPa3Ti3The preparation method of the medium-entropy alloy is characterized in that the homogenizing annealing temperature in the step one is 1150-1200 ℃, the heat preservation time is 2-6 h, and the cooling mode is air cooling.
3. A (CoCrNi) Al according to claim 1 having a tensile strength of up to 2GPa3Ti3The preparation method of the medium-entropy alloy is characterized in that the hot rolling initial rolling temperature in the step two is 1100-1150 ℃, the final rolling temperature is 950-1000 ℃, the rolling is divided into 2 passes, and the reduction of each pass is 25-35%.
4. A (CoCrNi) Al according to claim 1 having a tensile strength of up to 2GPa3Ti3The preparation method of the medium-entropy alloy is characterized in that the cold rolling in the step three is divided into 3 passes, and the reduction of each pass is 20-25%.
5. A (CoCrNi) Al according to claim 1 having a tensile strength of up to 2GPa3Ti3The preparation method of the medium-entropy alloy is characterized in that the annealing temperature in the step four is 800 ℃, and the heat preservation time is 1-2 hours.
6. A (CoCrNi) Al according to claim 1 having a tensile strength of up to 2GPa3Ti3The preparation method of the medium-entropy alloy is characterized in that the aging treatment temperature in the fifth step is 600-700 ℃, and the heat preservation time is 4-8 h.
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| CN115927944A (en) * | 2022-11-21 | 2023-04-07 | 广东省科学院中乌焊接研究所 | Medium-entropy alloy and preparation method thereof |
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Application publication date: 20210601 |