CN113798495B - High-entropy alloy sintering molding process with equivalent conversion of double elements - Google Patents
High-entropy alloy sintering molding process with equivalent conversion of double elements Download PDFInfo
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Abstract
The invention discloses a double-element equivalent transformerThe exchanged high-entropy alloy sintering molding process is implemented according to the following steps: step 1, weighing and mixing Co, cr, fe, ni, cu, ti simple substance powder according to equal atomic percentage, and preparing CoCrFeNi (CuTi) with different proportion components x High entropy alloy powder, wherein x = 0.2-1.0; step 2, placing the high-entropy alloy powder configured in the step 1 into a ball milling tank for high-energy ball milling to prepare mixed high-entropy alloy powder with uniform required components and different proportion components; step 3, carrying out vacuum hot-press sintering or rapid hot-press sintering molding on the mixed high-entropy alloy powder obtained in the step 2, and demoulding after the mixed high-entropy alloy powder is sintered and cooled to obtain (CuTi) x High-entropy alloy block with equivalent transformation of double elements. The preparation method is simple, the production cost is low, and the obtained high-entropy alloy has high density and uniform structure.
Description
Technical Field
The invention belongs to the technical field of high-entropy alloy preparation processes, and relates to a sintering and forming process of a dual-element equivalent transformation high-entropy alloy.
Background
The high-entropy alloy is a novel alloy derived in the development process of amorphous alloy, and has excellent properties such as high hardness, high corrosion resistance, high wear resistance, high oxidation resistance and the like, so that the high-entropy alloy is widely focused by material researchers. In 1995, she Junwei taught the design concept of multi-principal element high-entropy alloy: the alloy elements are generally more than or equal to 5 elements, the atomic percentage of each element is 5% -35%, and the entropy value is more than 1.61R. The novel alloy design concept breaks through the design concept of a single principal element of the traditional alloy, and creates a novel idea in the field of alloy design. Conventional alloy design concepts consider that the more alloy components, the more likely intermetallic or complex phases are formed. However, studies have shown that alloy compositions composed of a plurality of main elements produce a high entropy effect which promotes the formation of solid solution phases having a body-centered cubic or face-centered cubic, etc., suppresses the formation of intermetallic compounds, and even favors the formation of amorphous structures.
The preparation process of the high-entropy alloy can be mainly divided into four types, namely a mechanical alloying method, a powder metallurgy method, a vacuum melting method and a laser cladding method, however, the methods such as the vacuum melting method and the laser cladding method are only suitable for laboratory researches, have a series of defects of huge cost, complex equipment, complex process, unavoidable tissue segregation and the like, have larger influence on the future commercial development of the high-entropy alloy, limit the batch production of the high-entropy alloy and are not beneficial to the application of the high-entropy alloy. However, the mechanical alloying method is often combined with the powder metallurgy method, and can effectively improve tissue segregation, has low production cost, can be produced in a large scale, and the like, so that the exploration of the sintering process by adopting vacuum hot pressing and rapid hot pressing sintering is important for the mass production of the future high-entropy alloy.
Disclosure of Invention
The invention aims to provide a double-element equivalent transformation high-entropy alloy sintering molding process, which has the advantages of simple preparation method, low production cost, high density and uniform structure of the obtained high-entropy alloy.
The technical scheme adopted by the invention is that the high-entropy alloy sintering molding process with equivalent conversion of double elements is implemented according to the following steps:
step 1, weighing and mixing Co, cr, fe, ni, cu, ti simple substance powder according to equal atomic percentage, and preparing CoCrFeNi (CuTi) with different proportion components x High entropy alloy mixed powder, wherein x=0.2-1.0;
step 2, placing the high-entropy alloy mixed powder prepared in the step 1 into a ball milling tank for high-energy ball milling to prepare mixed high-entropy alloy powder with uniform required components and different proportion components;
step 3, carrying out vacuum hot-press sintering or rapid hot-press sintering molding on the mixed high-entropy alloy powder obtained in the step 2, and demoulding after the mixed high-entropy alloy powder is sintered and cooled to obtain (CuTi) x High-entropy alloy block with equivalent transformation of double elements.
The present invention is also characterized in that,
the Co, cr, fe, ni, cu, ti simple substance powder in the step 1 is powder with the purity of 99 percent and the particle size of 40-48 um.
In the step 2, the mass ratio of the ball materials is 8-12 during ball milling: 1, the rotating speed of the ball mill is 200-400 r/min, and the ball milling time is 20-24 h.
The grinding balls are divided into three grinding balls of large, medium and small sizes with diameters of 9.5mm, 5mm and 3mm during ball milling in the step 2; the mass ratio of the large, medium and small grinding balls is 2:3:5.
the vacuum degree of the vacuum hot-pressed sintering in the step 3 is 1.5x10 -2 pa, sintering pressure is 30-40 MPa, sintering temperature is 1050-1200 ℃, and heat preservation time is 30-60 min.
The vacuum hot-pressed sintering is specifically as follows:
pre-pressing the mixed high-entropy alloy powder obtained in the step 2 in a graphite grinding tool, placing the graphite grinding tool in a sintering furnace, applying pressure to 30-40 Mpa, and vacuumizing to a vacuum degree of 1.5x10 -2 pa; raising the temperature from room temperature to 300 ℃ at a heating rate of 10 ℃/min, and preserving the temperature at 300 ℃ for 10min; then the temperature is increased from 300 ℃ to 1050 ℃ to 1200 ℃ at the heating rate of 10 ℃/min, and the temperature is kept for 30 to 60 minutes.
The vacuum degree of the rapid hot pressing sintering in the step 3 is 1.2pa, the sintering pressure is 30-40 MPa, the sintering temperature is 950-1050 ℃, and the heat preservation time is 30-60 min.
The rapid hot press sintering in the step 3 specifically comprises the following steps: pre-pressing the mixed high-entropy alloy powder obtained in the step 2 in a graphite grinding tool, and then placing the graphite grinding tool in a sintering furnace to apply pressure to 30-40 MPa; vacuumizing to a vacuum degree of 1.2pa; raising the temperature from room temperature to 300 ℃ at a heating rate of 100 ℃/min, and preserving the temperature at 300 ℃ for 10min; then the temperature is raised from 300 ℃ to 950 ℃ to 1050 ℃ at the heating rate of 100 ℃/min, and the temperature is kept for 30 to 60 minutes.
The beneficial effects of the invention are as follows:
the invention can rapidly prepare the needed high-entropy alloy block with high density, has low preparation cost and simple equipment operation, and is suitable for industrialized mass production.
The alloy block prepared by the method has uniform and effective tissue components, and component segregation is avoided.
Drawings
Fig. 1 is a metallographic structure diagram and SEM scan diagram of a CoCrFeNi (CuTi) X high-entropy alloy bulk material of example 3 of the present invention, x=0.4;
fig. 2 is a metallographic structure diagram and SEM scan diagram of a CoCrFeNi (CuTi) X high-entropy alloy bulk material of example 5 of the present invention, x=0.4;
fig. 3 is a metallographic structure diagram and SEM scan diagram of a CoCrFeNi (CuTi) X high-entropy alloy bulk material of example 6 of the present invention, x=0.4;
FIG. 4 is a graph of optimum sintering temperature versus time for sintering using vacuum hot pressing in accordance with the present invention;
FIG. 5 is a graph of optimum sintering temperature versus time for rapid hot press sintering in accordance with the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention discloses a sintering and forming process of a double-element equivalent transformed high-entropy alloy, which is implemented according to the following steps:
step 1, weighing and mixing Co, cr, fe, ni, cu, ti simple substance powder with purity of 99% and particle size of 40-48 um according to equal atomic percentage, and preparing CoCrFeNi (CuTi) with different proportion components x High entropy alloy powder, wherein x = 0.2-1.0;
step 2, placing the high-entropy alloy powder configured in the step 1 into a ball milling tank for high-energy ball milling, wherein the mass ratio of ball materials is 8-12 during ball milling: 1, the rotating speed of the ball mill is 200-400 r/min, the ball milling time is 20-24 h, and the grinding balls are divided into three grinding balls with the diameters of 9.5mm, 5mm and 3mm, namely a large grinding ball, a medium grinding ball and a small grinding ball; the mass ratio of the large, medium and small grinding balls is 2:3:5, preparing mixed high-entropy alloy powder with uniform required components and different proportion components;
step 3, carrying out vacuum hot-press sintering or rapid hot-press sintering molding on the mixed high-entropy alloy powder obtained in the step 2, and demoulding after the mixed high-entropy alloy powder is sintered and cooled to obtain (CuTi) x High-entropy alloy blocks with equivalent transformation of double elements;
in the case of vacuum hot press sintering, the vacuum degree of the vacuum hot press sintering is 1.5x10 -2 pa, sintering pressure is 30-40 MPa, sintering temperature is 1050-1200 ℃, heat preservation time is 30-60 min, and the method specifically comprises the following steps:
pre-pressing the mixed high-entropy alloy powder obtained in the step 2 in a graphite grinding tool, placing the graphite grinding tool in a sintering furnace, applying pressure to 30-40 Mpa, and vacuumizing to a vacuum degree of 1.5x10 -2 pa; raising the temperature from room temperature to 300 ℃ at a heating rate of 10 ℃/min, and preserving the temperature at 300 ℃ for 10min; then the temperature is increased from 300 ℃ to 1050 ℃ to 1200 ℃ at the heating rate of 10 ℃/min, and the temperature is kept for 30 to 60 minutes.
If the rapid hot-pressing sintering is performed, the vacuum degree of the rapid hot-pressing sintering is 1.2pa, the sintering pressure is 30-40 MPa, the sintering temperature is 950-1050 ℃, and the heat preservation time is 30-60 min, and specifically comprises: pre-pressing the mixed high-entropy alloy powder obtained in the step 2 in a graphite grinding tool, and then placing the graphite grinding tool in a sintering furnace to apply pressure to 30-40 MPa; vacuumizing to a vacuum degree of 1.2pa; raising the temperature from room temperature to 300 ℃ at a heating rate of 100 ℃/min, and preserving the temperature at 300 ℃ for 10min; then the temperature is raised from 300 ℃ to 950 ℃ to 1050 ℃ at the heating rate of 100 ℃/min, and the temperature is kept for 30 to 60 minutes.
Example 1
CoCrFeNi (CuTi) for alloy composition x=0.4 x And (5) carrying out sintering comparison test on the high-entropy alloy powder.
Co powder, cr powder, fe powder, ni powder, cu powder and Ti powder with the purity of 99 percent and the grain diameter of 44um are taken as raw materials, weighed and mixed according to the equal atomic ratio to prepare high-entropy alloy mixed powder with the proportion of Co to Cr to Fe to Ni to Cu to Ti=1:1:1:0.4:0.4, and then ball-milled for 20-24 hours in a ball mill. Placing the mixed powder into a mould, vibrating uniformly and prepressing, placing the mould into the furnace chamber of a vacuum hot-pressing sintering furnace for pressure sintering, maintaining the pressure in the sintering process at 30-40 MPa, and vacuumizing to the vacuum degree of 1.5x10 -2 pa, then raising the temperature from room temperature to 300 ℃ at a heating rate of 10 ℃/min, and preserving the temperature at 300 ℃ for 10min; then the temperature is increased from 300 ℃ to 1050 ℃ at the heating rate of 10 ℃/min, and the temperature is kept for 60min, and then the pressure is reduced; sequentially carrying out surface grinding and deburring treatment on the prepared blank, and obtaining CoCrFeNi (CuTi) with x=0.4 of vacuum hot-pressed sintering x High entropy alloy block.
Wherein the addition amount of the process control agent in the ball milling process is 0.6-1.2%, and the mass ratio of the ball materials is 8-12: 1, wherein the grinding balls are divided into three grinding balls of large, medium and small sizes and have diameters of 9.5mm, 5mm and 3 mm; the mass ratio of the large grinding ball to the medium grinding ball to the small grinding ball is 2:3:5.
x=0.4CoCrFeNi(CuTi) x Carrying out tissue and performance test on the high-entropy alloy material sample after polishing, wherein the obtained technical parameters are shown in table 1;
TABLE 1 results of Performance test of high entropy alloy materials prepared in example 1
Example 2
CoCrFeNi (CuTi) for alloy composition x=0.4 x And (5) carrying out sintering comparison test on the high-entropy alloy powder.
Co powder, cr powder, fe powder, ni powder, cu powder and Ti powder with the purity of 99 percent and the grain diameter of 44um are taken as raw materials, weighed and mixed according to the equal atomic ratio to prepare high-entropy alloy mixed powder with the proportion of Co to Cr to Fe to Ni to Cu to Ti=1:1:1:0.4:0.4, and then ball-milled for 20-24 hours in a ball mill. Placing the mixed powder into a mould, vibrating uniformly and prepressing, placing the mould into the furnace chamber of a vacuum hot-pressing sintering furnace for pressure sintering, maintaining the pressure in the sintering process at 30-40 MPa, and vacuumizing to the vacuum degree of 1.5x10 -2 pa, then raising the temperature from room temperature to 300 ℃ at a heating rate of 10 ℃/min, and preserving the temperature at 300 ℃ for 10min; then the temperature is increased from 300 ℃ to 1100 ℃ at the heating rate of 10 ℃/min, and the temperature is kept for 60min, and then the pressure is reduced; sequentially carrying out surface grinding and deburring treatment on the prepared blank, and obtaining CoCrFeNi (CuTi) with x=0.4 of vacuum hot-pressed sintering x High entropy alloy block.
Wherein the addition amount of the process control agent in the ball milling process is 0.6-1.2%, and the mass ratio of the ball materials is 8-12: 1, wherein the grinding balls are divided into three grinding balls of large, medium and small sizes and have diameters of 9.5mm, 5mm and 3 mm; the mass ratio of the large grinding ball to the medium grinding ball to the small grinding ball is 2:3:5.
CoCrFeNi (CuTi) with x=0.4 x Carrying out tissue and performance test on the high-entropy alloy material sample after polishing, wherein the obtained technical parameters are shown in Table 2;
TABLE 2 Performance test results of high entropy alloy materials prepared in example 1
Example 3
CoCrFeNi (CuTi) for alloy composition x=0.4 x And (5) carrying out sintering comparison test on the high-entropy alloy powder.
Co powder, cr powder, fe powder, ni powder, cu powder and Ti powder with the purity of 99 percent and the grain diameter of 44um are taken as raw materials, weighed and mixed according to the equal atomic ratio to prepare high-entropy alloy mixed powder with the proportion of Co to Cr to Fe to Ni to Cu to Ti=1:1:1:0.4:0.4, and then ball-milled for 20-24 hours in a ball mill. Placing the mixed powder into a mould, vibrating uniformly and prepressing, placing the mould into the furnace chamber of a vacuum hot-pressing sintering furnace for pressure sintering, maintaining the pressure in the sintering process at 30-40 MPa, and vacuumizing to the vacuum degree of 1.5x10 -2 pa, then raising the temperature from room temperature to 300 ℃ at a heating rate of 10 ℃/min, and preserving the temperature at 300 ℃ for 10min; then the temperature is increased from 300 ℃ to 1150 ℃ at the heating rate of 10 ℃/min, and the temperature is kept for 60min, and then the pressure is reduced; and sequentially carrying out surface grinding and deburring treatment on the prepared blank to prepare the CoCrFeNi (CuTi) x high-entropy alloy block with x=0.4 sintered by vacuum hot pressing.
Wherein the addition amount of the process control agent in the ball milling process is 0.6-1.2%, and the mass ratio of the ball materials is 8-12: 1, wherein the grinding balls are divided into three grinding balls of large, medium and small sizes and have diameters of 9.5mm, 5mm and 3 mm; the mass ratio of the large grinding ball to the medium grinding ball to the small grinding ball is 2:3:5.
CoCrFeNi (CuTi) with x=0.4 x Carrying out tissue and performance test on the high-entropy alloy material sample after polishing, wherein the obtained technical parameters are shown in Table 3;
TABLE 3 Performance test results of high entropy alloy materials prepared in example 1
Example 4
CoCrFeNi (CuTi) for alloy composition x=0.4 x And (5) carrying out sintering comparison test on the high-entropy alloy powder.
Co powder, cr powder, fe powder, ni powder, cu powder and Ti powder with the purity of 99 percent and the grain diameter of 44um are taken as raw materials, weighed and mixed according to the equal atomic ratio to prepare high-entropy alloy mixed powder with the proportion of Co to Cr to Fe to Ni to Cu to Ti=1:1:1:0.4:0.4, and then ball-milled for 20-24 hours in a ball mill. Placing the mixed powder into a mould, vibrating uniformly and prepressing, placing the mould into the furnace chamber of a vacuum hot-pressing sintering furnace for pressure sintering, maintaining the pressure in the sintering process at 30-40 MPa, and vacuumizing to the vacuum degree of 1.5x10 -2 pa, then raising the temperature from room temperature to 300 ℃ at a heating rate of 10 ℃/min, and preserving the temperature at 300 ℃ for 10min; then the temperature is increased from 300 ℃ to 1200 ℃ at the heating rate of 10 ℃/min, and the temperature is kept for 60min, and then the pressure is reduced; sequentially carrying out surface grinding and deburring treatment on the prepared blank, and obtaining CoCrFeNi (CuTi) with x=0.4 of vacuum hot-pressed sintering x High entropy alloy block.
Wherein the addition amount of the process control agent in the ball milling process is 0.6-1.2%, and the mass ratio of the ball materials is 8-12: 1, wherein the grinding balls are divided into three grinding balls of large, medium and small sizes and have diameters of 9.5mm, 5mm and 3 mm; the mass ratio of the large grinding ball to the medium grinding ball to the small grinding ball is 2:3:5.
CoCrFeNi (CuTi) with x=0.4 x Performing tissue and performance tests after polishing the high-entropy alloy material sample, wherein the obtained technical parameters are shown in Table 4;
TABLE 4 Performance test results of the high entropy alloy materials prepared in example 1
Example 5
CoCrFeNi (CuTi) for alloy composition x=0.4 x And (5) carrying out sintering comparison test on the high-entropy alloy powder.
Co powder, cr powder and Fe powder with the purity of 99 percent and the grain diameter of 44um are adoptedThe high-entropy alloy powder is prepared by weighing and mixing Ni powder, cu powder and Ti powder as raw materials according to an equal atomic ratio, preparing high-entropy alloy mixed powder with the ratio of Co to Cr to Fe to Ni to Cu to Ti=1:1:1:1:0.4:0.4, and then ball milling for 20-24 hours in a ball mill. Placing the mixed powder into a mould, vibrating uniformly and prepressing, placing the mould into a furnace chamber of a rapid hot-pressing sintering furnace for pressure sintering, maintaining the pressure at 30-40 MPa in the sintering process, vacuumizing to a vacuum degree of 1.2pa, then heating from room temperature to 300 ℃ at a heating rate of 100 ℃/min, and preserving heat at 300 ℃ for 10min; then heating from 300 ℃ to 1000 ℃ at a heating rate of 100 ℃/min, and continuously pressurizing and cooling after heat preservation for 30 min; sequentially carrying out surface grinding and deburring treatment on the prepared blank, and obtaining CoCrFeNi (CuTi) with x=0.4 of vacuum hot-pressed sintering x High entropy alloy block.
Wherein the addition amount of the process control agent in the ball milling process is 0.6-1.2%, and the mass ratio of the ball materials is 8-12: 1, wherein the grinding balls are divided into three grinding balls of large, medium and small sizes and have diameters of 9.5mm, 5mm and 3 mm; the mass ratio of the large grinding ball to the medium grinding ball to the small grinding ball is 2:3:5.
CoCrFeNi (CuTi) with x=0.4 x Carrying out tissue and performance test on the high-entropy alloy material sample after polishing, wherein the obtained technical parameters are shown in Table 5;
TABLE 5 results of Performance test of high entropy alloy materials prepared in example 1
Example 6
CoCrFeNi (CuTi) for alloy composition x=0.4 x And (5) carrying out sintering comparison test on the high-entropy alloy powder.
Co powder, cr powder, fe powder, ni powder, cu powder and Ti powder with the purity of 99 percent and the grain diameter of 44um are taken as raw materials, weighed and mixed according to the equal atomic ratio to prepare high-entropy alloy mixed powder with the proportion of Co to Cr to Fe to Ni to Cu to Ti=1:1:1:0.4:0.4, and then ball-milled for 20-24 hours in a ball mill. Placing the mixed powder into a mould, vibrating uniformly and prepressing, and placing the mould into a rapid hot-pressing sintering furnaceThe pressure sintering is carried out in the furnace chamber, the pressure is maintained at 30-40 MPa in the sintering process, the vacuum is pumped to 1.2pa, then the temperature is raised to 300 ℃ from room temperature at the heating rate of 100 ℃/min, and the heat is preserved for 10min at 300 ℃; then heating from 300 ℃ to 1000 ℃ at a heating rate of 100 ℃/min, and continuously pressurizing and cooling after heat preservation for 60min; sequentially carrying out surface grinding and deburring treatment on the prepared blank, and obtaining CoCrFeNi (CuTi) with x=0.4 of vacuum hot-pressed sintering x High entropy alloy block.
Wherein the addition amount of the process control agent in the ball milling process is 0.6-1.2%, and the mass ratio of the ball materials is 8-12: 1, wherein the grinding balls are divided into three grinding balls of large, medium and small sizes and have diameters of 9.5mm, 5mm and 3 mm; the mass ratio of the large grinding ball to the medium grinding ball to the small grinding ball is 2:3:5.
CoCrFeNi (CuTi) with x=0.4 x The high-entropy alloy material sample is subjected to tissue and performance test after being ground and polished, and the obtained technical parameters are shown in Table 6;
TABLE 6 Performance test results of high entropy alloy materials prepared in example 1
CoCrFeNi (CuTi) of example 3, example 5 and example 6 where x=0.4 x The metallographic OM and SEM pictures of the high-entropy alloy are shown in figures 1, 2 and 3; wherein a in fig. 1, 2 and 3 is a gold phase diagram, and b in fig. 1, 2 and 3 is an SEM diagram; wherein fig. 1 (a) and (b) are the microstructure of example 3, fig. 2 (a) and (b) are the microstructure of example 5, and fig. 3 (a) and (b) are the microstructure of example 6, and it can be seen from fig. 1, fig. 2 and fig. 3 that x= CoCrFeNi (CuTi) of 0.4 x The high-entropy alloy block has a very uniform structure and higher density, and the optimal sintering temperature of the vacuum hot-press sintering is about 150 ℃ higher than that of the rapid hot-press sintering, which is probably related to the heating modes of two devices.
The dual-element equivalent-conversion high-entropy alloy vacuum hot-press sintering and rapid hot-press sintering molding process adopts two sintering furnaces for sintering, so that high-entropy alloy powder which is uniformly mixed by ball milling is sintered and molded under the combined action of heat and force, thereby obtaining an optimal sintering process and preparing alloy blocks with various components. The high-entropy alloy block prepared by the method has high density, uniform components, fine grains and low cost, can meet the large-scale industrialization requirement, and has important research guiding value for the future industrial development of the high-entropy alloy.
The invention is a high-entropy alloy vacuum hot-press sintering and rapid hot-press sintering molding process with short flow, low cost, difficult oxidation of powder, high density, effective control of grain size, uniform components and large scale.
The preparation method provided by the invention is simple, high in density, low in production cost, uniform in structure and capable of effectively avoiding component segregation, and the CoCrFeNi-based high-entropy alloy block material with high hardness and toughness can be obtained at a low sintering temperature.
Claims (1)
1. A sintering and forming method of a double-element equivalent transformed high-entropy alloy is characterized by comprising the following steps:
step 1, weighing and mixing Co, cr, fe, ni simple substance powder according to equal atomic percentage, weighing and mixing Cu and Ti simple substance powder according to equal atomic percentage, and preparing CoCrFeNi (CuTi) with different proportion components x High entropy alloy powder, wherein x = 0.2-1.0; co, cr, fe, ni, cu, ti the simple substance powder has the purity of 99 percent and the particle diameter of 40um-48 um;
step 2, placing the high-entropy alloy powder configured in the step 1 into a ball milling tank for high-energy ball milling to prepare mixed high-entropy alloy powder with uniform required components and different proportion components; the ball mass ratio during ball milling is 8-12: 1, the rotating speed of the ball mill is 200-400 r/min, and the ball milling time is 20-24 h; the grinding balls are divided into three grinding balls of large, medium and small sizes with diameters of 9.5mm, 5mm and 3mm during ball milling; the mass ratio of the large grinding ball to the medium grinding ball to the small grinding ball is 2:3:5, a step of;
step 3, carrying out vacuum hot-press sintering or rapid hot-press sintering molding on the mixed high-entropy alloy powder obtained in the step 2, and demoulding after the mixed high-entropy alloy powder is sintered and cooled to obtain a CuTi dual-element equivalent transformed high-entropy alloy block;
the vacuum hot-pressed sintering is specifically as follows:
pre-pressing the mixed high-entropy alloy powder obtained in the step 2 in a graphite die, placing the graphite die in a sintering furnace, applying pressure to 30-40 Mpa, and vacuumizing to a vacuum degree of 1.5x10 -2 pa; raising the temperature from room temperature to 300 ℃ at a heating rate of 10 ℃/min, and preserving the temperature at 300 ℃ for 10min; then the temperature is increased from 300 ℃ to 1050 ℃ to 1200 ℃ at the heating rate of 10 ℃/min, and the temperature is kept for 30 to 60 minutes;
the rapid hot press sintering in the step 3 specifically comprises the following steps: pre-pressing the mixed high-entropy alloy powder obtained in the step 2 in a graphite die, and then placing the pre-pressed powder in a sintering furnace to apply pressure to 30-40 MPa; vacuumizing to a vacuum degree of 1.2pa; raising the temperature from room temperature to 300 ℃ at a heating rate of 100 ℃/min, and preserving the temperature at 300 ℃ for 10min; then the temperature is raised from 300 ℃ to 950 ℃ to 1050 ℃ at the heating rate of 100 ℃/min, and the temperature is kept for 30 to 60 minutes.
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| CN202110927526.4A CN113798495B (en) | 2021-08-12 | 2021-08-12 | High-entropy alloy sintering molding process with equivalent conversion of double elements |
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