CN110899712A - Aluminum-iron-containing high-entropy alloy suitable for additive manufacturing and modification method thereof - Google Patents
Aluminum-iron-containing high-entropy alloy suitable for additive manufacturing and modification method thereof Download PDFInfo
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- CN110899712A CN110899712A CN201911306381.5A CN201911306381A CN110899712A CN 110899712 A CN110899712 A CN 110899712A CN 201911306381 A CN201911306381 A CN 201911306381A CN 110899712 A CN110899712 A CN 110899712A
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Abstract
The invention provides a method for modifying high-entropy alloy containing aluminum and iron components and suitable for additive manufacturing, which comprises the following steps: s1: preparing materials, namely preparing high-purity metal and beryllium, wherein the high-purity metal is 4-5 of aluminum, iron, cobalt, chromium, nickel, manganese and titanium, and the aluminum and iron elements account for 40-50% of the weight of the high-entropy alloy; s2: smelting and atomizing to prepare powder, namely smelting high-purity metal and beryllium and then atomizing to prepare powder to obtain powder. The smelting temperature is 1100-1300 ℃, the temperature is kept for 15-35 min, and after modification, atomization is carried out, wherein the beryllium is high-purity beryllium beads. The modification method of the aluminum-iron-based high-entropy alloy powder material is simple, modification can be completed only by adding beryllium as a modified alloy element in the process of preparing the aluminum-iron-based high-entropy alloy powder, and the modification cost is low; the amorphous structure can be obtained by using the modified aluminum-iron-based high-entropy alloy powder material for additive manufacturing, the density of the formed high-entropy alloy product can reach more than 99.9 percent, and the requirement of high-entropy alloy additive manufacturing is met.
Description
Technical Field
The invention relates to the field of additive manufacturing, in particular to a high-entropy alloy modification method suitable for additive manufacturing and containing aluminum-iron components and a high-entropy alloy.
Background
High-entropy Alloys (HEA) are Alloys formed from five or more metals in equal or approximately equal amounts. High entropy alloys are considered to be of considerable interest in material science and engineering, since they may have many desirable properties. The main metal components in the prior art alloys may be only one to two. For example, iron-based alloys are obtained by adding trace elements to improve their properties. In the conventional concept, the material is embrittled as the number of types of metals added to the alloy increases, but the high-entropy alloy is different from the conventional alloy in that a plurality of types of metals are not embrittled, and is a new material.
Due to the unique properties of the high-entropy alloy, a rapid solidification mode is often used for preparing raw materials in a preparation process, such as an atomization powder preparation process, and then an alloy ingot is prepared by using a powder metallurgy method. Form a high-entropy alloy material with an amorphous structure, and obtain high mechanical property and hardness. As the rapid solidification structure can be obtained by the additive manufacturing process, the additive manufacturing can be used as a forming mode of the high-entropy alloy. However, in the additive manufacturing process, the change of a molten pool caused by the movement of light spots has a crystallization effect on the high-entropy alloy in a nearby range, so that the high-entropy alloy amorphous structure is difficult to obtain by using the traditional aluminum-iron-based high-entropy alloy system powder material for additive manufacturing.
Disclosure of Invention
The invention provides a modification method for aluminum-and-iron-containing high-entropy alloy powder, which is used for solving the problem that an amorphous structure is difficult to obtain after an aluminum-iron-based high-entropy alloy system powder material is subjected to additive manufacturing and molding, and meets the requirement of high-entropy alloy additive manufacturing.
In order to achieve the aim, the invention provides a method for modifying a high-entropy alloy containing aluminum and iron components and suitable for additive manufacturing, which comprises the following steps:
s1: preparing materials, namely preparing high-purity metal and beryllium, wherein the high-purity metal is 4-5 of aluminum, iron, cobalt, chromium, nickel, manganese and titanium, and the aluminum and iron elements account for 40-50% of the weight of the high-entropy alloy;
s2: smelting and atomizing to prepare powder, namely smelting high-purity metal and beryllium and then atomizing to prepare powder to obtain powder.
Further, before preparing the high-purity metal, removing an oxide layer on the surface of the high-purity metal, and drying for later use. The method for removing the surface oxide layer may be a removing method known in the art, such as cutting to remove the surface oxide layer. The drying method can adopt drying modes such as air drying, vacuum drying and the like.
Furthermore, the removing mode of the surface oxide layer is grinding and polishing, and the vacuum drying mode is drying for 2-4 h at 120 ℃ in a vacuum drying oven.
Furthermore, the smelting temperature is 1100-1300 ℃, and atomization is carried out after the temperature is kept for 15-35 min for modification.
Further, the beryllium is high-purity beryllium beads.
Furthermore, the smelting adopts a step-by-step smelting mode, high-purity metal is firstly added into a crucible of a smelting chamber to be completely molten, heat preservation is carried out, and beryllium is then added. In this step, the dried raw material is added to a crucible of a melting chamber, and beryllium beads are put into a secondary feed opening.
Further, the smelting temperature of the high-purity metal in the smelting step is 1100-1300 ℃.
Furthermore, beryllium beads are added after the high-purity metal is completely melted and the temperature is kept for 15-30 min. The beryllium beads are added from a secondary feeding port.
And further, after beryllium is added, the temperature is kept for 5-30min, and then atomization is started.
Further, the atomizing step comprises: pouring the smelted metal into a tundish, wherein the temperature of the tundish is 1050-.
Further preferably, the temperature of the tundish is 1000 ℃ ± 20 ℃.
Further, vacuum and/or inert gas means may be employed in the melting and atomizing chambers to prevent oxidation of the metal. Optionally, the melting chamber and the atomizing chamber are evacuated, the pressure in the melting chamber and the atomizing chamber is lower than 50Pa, preferably lower than 15Pa, further lower than 10Pa, and then argon is introduced to atmospheric pressure.
Further, the step S2 is followed by a powder classifying step S3:
s3: and classifying the powder material according to the requirement of additive manufacturing powder, and obtaining a beryllium modified high-entropy alloy powder finished product after screening.
Further, the upper limit and the lower limit of the powder classification are respectively 15 microns and 53 microns of the finished modified high-entropy alloy powder.
Further, the powder fraction is sieved through a vibrating sieving machine.
Further, metal additive manufacturing equipment is adopted to perform additive manufacturing processing on the modified high-entropy alloy powder finished product to obtain a modified high-entropy alloy, and the density of the obtained molded sample piece can reach more than 99.9%.
Furthermore, the processing parameters of the metal additive manufacturing equipment are laser power of 270-.
Furthermore, the processing parameters of the metal additive manufacturing equipment are that the laser power is 300W, the powder laying layer thickness is 30 micrometers, the laser scanning speed is 1200mm/s, the lap joint rate is 50%, and the scanning interval is 100 micrometers.
Furthermore, the mechanical property of the high-entropy alloy is improved by carrying out heat treatment on the high-entropy alloy.
Further, after heat treatment is carried out for 0.5h to 1h at the temperature of 700 ℃ to 900 ℃, cold water quenching is carried out, and finally the mechanical property of the high-entropy alloy can reach more than 1100MPa, and the hardness is more than 520HV
Furthermore, after the heat treatment is carried out for 0.5h at the temperature of 800 ℃, the alloy is quenched by cold water, and finally the mechanical property of the high-entropy alloy can reach more than 1200Mpa and the hardness is more than 530 HV.
Furthermore, the invention also provides high-entropy alloy powder, which comprises 4 to 5 of aluminum, iron, cobalt, chromium, nickel, manganese and titanium, wherein the aluminum and iron elements account for 40 to 50 percent of the weight of the high-entropy alloy; wherein the mass fraction ratio of iron to beryllium is 7:1-9: 1.
Further, the mass fraction ratio of iron to beryllium is 8: 1.
After the scheme is adopted, the invention has the beneficial effects that:
1. the modification method of the aluminum-iron-based high-entropy alloy powder material is simple, modification can be completed only by adding beryllium as a modified alloy element in the process of preparing the aluminum-iron-based high-entropy alloy powder, and the modification cost is low;
2. amorphous structures can be obtained by using the modified aluminum-iron-based high-entropy alloy powder material for additive manufacturing, the density of a formed high-entropy alloy product can reach more than 99.9 percent, and the requirement of high-entropy alloy additive manufacturing is met;
3. beryllium is added through a secondary feeding device, so that the operator cannot be injured;
4. the beryllium is added to inhibit the generation of an Al3Fe4 phase in the Al-Fe matrix high-entropy alloy, the generation of an Al-Fe needle phase is reduced, the crystallization of the high-entropy alloy in the additive manufacturing process is slowed down, and meanwhile, the non-crystallization of a formed part is ensured by using heat treatment, so that the aim of realizing the additive manufacturing of the high-entropy alloy is fulfilled.
5. Through carrying out heat treatment on the high-entropy alloy product formed by additive manufacturing, the mechanical property is improved, and the mechanical property of the final sample piece can reach more than 1100MPa and the hardness is more than 520 HV.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1:
the invention is further explained by taking the preparation of beryllium modified Al22Fe24Co15Ni16Ti23 high-entropy alloy powder as an example.
The preparation process comprises the following steps:
s1: preparing materials: the alloy raw material uses high-purity metals of aluminum, iron, cobalt, nickel and titanium. Before feeding, polishing a surface oxide layer, putting the polished surface oxide layer into a vacuum drying oven for drying for 3 hours at 120 ℃ for later use, and simultaneously weighing high-purity beryllium beads for later use, wherein the aluminum and the iron element account for 46 percent of the weight of the high-entropy alloy;
s2: smelting and atomizing to prepare powder, adding the dried raw materials into a crucible of a smelting chamber, and putting beryllium beads into a secondary feeding port.
Starting a vacuum system, vacuumizing the smelting chamber and the atomizing chamber to 10Pa, and then filling argon to atmospheric pressure.
Starting a smelting system, carrying out programmed induction heating of heating-heat preservation-cooling-heat preservation in a smelting chamber, setting the smelting power to be 100KW, heating from room temperature to 1200 ℃, synchronously heating a tundish to 1100 ℃, preserving heat for 20min after the metal block in the crucible is completely molten, fully melting and mixing, and then adding beryllium beads from a secondary feeding port; keeping the temperature for 10min, and starting atomization.
Pouring the melt into a heated tundish, and introducing the mixed metal melt into an atomizing spray gun through a liquid guide pipe at the bottom of the tundish.
Argon is used as an atomizing medium, the atomizing pressure is adjusted to be 3.8MPa, the mixed metal melt is sprayed into an atomizing chamber by an atomizing spray gun and then is crushed into fine metal droplets by high-pressure argon, and alloy powder is obtained after cooling and solidification.
S3: and then, carrying out powder classification on the alloy powder: and classifying the powder material according to the requirement of additive manufacturing powder, wherein the upper limit and the lower limit are respectively 15 micrometers and 53 micrometers, and obtaining a beryllium modified Al22Fe24Co15Ni16Ti23 high-entropy alloy powder finished product after the sieving is finished.
In this example, the added amount of beryllium beads was 3% by mass of the powder material.
The powder adopts Renysha metal additive manufacturing equipment, the processing parameters of the metal additive manufacturing equipment are 300W of laser power, the thickness of a powder layer is 30 micrometers, the laser scanning speed is 1200mm/s, the lapping rate is 50%, the scanning distance is 100 micrometers, additive manufacturing processing is carried out, a molded sample piece with the density of 99.95% and the density of 3% beryllium modified Al22Fe24Co15Ni16Ti23 high-entropy alloy sample piece is obtained, the mechanical property is improved through a heat treatment mode of cold water quenching after heat preservation for 0.5 hour at 800 ℃, and the mechanical property of the final sample piece can reach 1200Mpa and the hardness is 530 HV.
Example 2
The invention is further explained by taking the preparation of beryllium modified Al20Fe16Cr18Ni22Mn24 high-entropy alloy powder as an example.
The preparation process comprises the following steps:
s1: preparing materials: the alloy raw materials use high-purity metals such as aluminum, iron, chromium, nickel and manganese, surface oxide layers are ground and polished before feeding, the alloy raw materials are put into a vacuum drying oven to be dried for 4 hours at 120 ℃ for standby, and meanwhile, high-purity beryllium beads are weighed for standby, wherein the aluminum and iron elements account for 36 percent of the weight of the high-entropy alloy;
s2: smelting and atomizing to prepare powder, adding the dried raw materials into a crucible of a smelting chamber, and putting beryllium beads into a secondary feeding port.
Starting a vacuum system, vacuumizing the smelting chamber and the atomizing chamber to 50Pa, and then filling argon to atmospheric pressure.
Starting a smelting system, carrying out programmed induction heating of heating-heat preservation-cooling-heat preservation in a smelting chamber, setting the smelting power to be 100KW, heating from room temperature to 1300 ℃, simultaneously synchronously heating a tundish to 1000 ℃, preserving heat for 15min after the metal block in the crucible is completely molten, fully melting and mixing, and then adding beryllium beads from a secondary feeding port; keeping the temperature for 5min, and starting atomization.
Pouring the melt into a heated tundish, and introducing the mixed metal melt into an atomizing spray gun through a liquid guide pipe at the bottom of the tundish.
Argon is used as an atomizing medium, the atomizing pressure is adjusted to be 3.5MPa, the mixed metal melt is sprayed into an atomizing chamber by an atomizing spray gun and then is crushed into fine metal droplets by high-pressure argon, and alloy powder is obtained after cooling and solidification.
S3: in the embodiment, the alloy powder is sieved by a vibrating sieving machine, the upper limit and the lower limit of the sieved particle size are respectively 15 micrometers and 53 micrometers, and after sieving is finished, a beryllium modified Al20Fe16Cr18Ni22Mn24 high-entropy alloy powder finished product is obtained.
In this example, the added amount of beryllium beads was 2% by mass of the powder material.
The powder adopts Renysha metal additive manufacturing equipment, the processing parameters of the metal additive manufacturing equipment are 320W of laser power, the thickness of a powder layer is 35 micrometers, the laser scanning speed is 1100mm/s, the lapping rate is 45%, and the scanning distance is 110 micrometers, so that additive manufacturing processing is carried out, a molded sample piece with the density of 99.92% and 2% beryllium modified Al20Fe16Cr18Ni22Mn24 high-entropy alloy sample pieces is obtained, the mechanical property is improved through a heat treatment mode of cold water quenching after heat preservation for 1 hour at 700 ℃, and finally the mechanical property of the sample piece can reach 1100MPa and the hardness is 520 HV.
Example 3
The invention is further explained by taking the preparation of beryllium modified Al20Fe16Cr18Ni22Mn24 high-entropy alloy powder as an example.
The preparation process comprises the following steps:
s1: preparing materials: the alloy raw material uses high-purity metals such as aluminum, iron, chromium, nickel and manganese. Before feeding, polishing a surface oxide layer, putting the polished surface oxide layer into a vacuum drying oven for drying for 3 hours at 120 ℃ for later use, and simultaneously weighing high-purity beryllium balls for later use, wherein aluminum and iron elements account for 36 percent of the weight of the high-entropy alloy;
s2: smelting and atomizing to prepare powder, adding the dried raw materials into a crucible of a smelting chamber, and putting beryllium beads into a secondary feeding port.
Starting a vacuum system, vacuumizing the smelting chamber and the atomizing chamber to 50Pa, and then filling argon to atmospheric pressure.
Starting a smelting system, carrying out programmed induction heating of heating-heat preservation-cooling-heat preservation in a smelting chamber, setting the smelting power to be 100KW, heating from room temperature to 1100 ℃, simultaneously synchronously heating the tundish to 980 ℃, preserving heat for 30min after the metal block in the crucible is completely melted, fully melting and mixing the metal block, and then adding beryllium beads from a secondary feed inlet; keeping the temperature for 30min, and starting atomization.
Pouring the melt into a heated tundish, and introducing the mixed metal melt into an atomizing spray gun through a liquid guide pipe at the bottom of the tundish.
Argon is used as an atomizing medium, the atomizing pressure is adjusted to be 4.0MPa, the mixed metal melt is sprayed into an atomizing chamber by an atomizing spray gun and then is crushed into fine metal droplets by high-pressure argon, and alloy powder is obtained after cooling and solidification.
S3: and (3) carrying out powder classification on the alloy powder, classifying the powder material according to the requirements of additive manufacturing powder, wherein the upper limit and the lower limit are respectively 15 micrometers and 53 micrometers, and obtaining a beryllium modified Al20Fe16Cr18Ni22Mn24 high-entropy alloy powder finished product after the screening is finished.
In this example, the added amount of beryllium beads was 1.8% by mass of the powder material.
The powder adopts Renysha metal additive manufacturing equipment, the processing parameters of the metal additive manufacturing equipment are 270W, the powder layer thickness is 25 micrometers, the laser scanning speed is 1100mm/s, the lapping rate is 55 percent, and the scanning distance is 90 micrometers, the additive manufacturing processing is carried out, the density of a formed sample piece can reach 99.91 percent, and a 1.8 percent beryllium modified Al20Fe16Cr18Ni22Mn24 high-entropy alloy sample piece is obtained, the mechanical property is improved through a heat treatment mode of cold water quenching after heat preservation at 900 ℃ for 0.5 hour, and the mechanical property of the final sample piece reaches 1150MPa and the hardness is 530 HV.
Example 4:
the invention is further explained by taking the preparation of beryllium modified Al22Fe24Co15Ni16Ti23 high-entropy alloy powder as an example.
The preparation process comprises the following steps:
s1: preparing materials: the alloy raw material uses high-purity metals of aluminum, iron, cobalt, nickel and titanium. Before feeding, cutting to remove a surface oxidation layer of high-purity metal, putting the high-purity metal into a vacuum drying oven to dry for 4 hours at 120 ℃ for later use, and meanwhile, weighing high-purity beryllium beads for later use;
s2: smelting and atomizing to prepare powder, adding the dried raw materials into a crucible of a smelting chamber, and putting beryllium beads into a secondary feeding port.
Starting a vacuum system, vacuumizing the smelting chamber and the atomizing chamber to 15Pa, and then filling argon to atmospheric pressure.
Starting a smelting system, carrying out programmed induction heating of heating-heat preservation-cooling-heat preservation in a smelting chamber, setting the smelting power to be 100KW, heating from room temperature to 1200 ℃, synchronously heating a tundish to 1200 ℃, preserving heat for 35min after the metal block in the crucible is completely molten, fully melting and mixing, and then adding beryllium beads from a secondary feeding port; keeping the temperature for 15min, and starting atomization.
Pouring the melt into a heated tundish, and introducing the mixed metal melt into an atomizing spray gun through a liquid guide pipe at the bottom of the tundish.
Argon is used as an atomizing medium, the atomizing pressure is adjusted to be 3.8MPa, the mixed metal melt is sprayed into an atomizing chamber by an atomizing spray gun and then is crushed into fine metal droplets by high-pressure argon, and alloy powder is obtained after cooling and solidification.
S3: and (3) powder grading, namely grading the powder material according to the requirements of additive manufacturing powder, wherein the upper limit and the lower limit are respectively 15 micrometers and 53 micrometers, and obtaining a beryllium modified Al22Fe24Co15Ni16Ti23 high-entropy alloy powder finished product after the sieving is finished.
In this example, the added amount of beryllium beads was 3.3% by mass of the powder material.
The powder adopts Renysha metal additive manufacturing equipment, the processing parameters of the metal additive manufacturing equipment are 350W of laser power, the thickness of a powder layer is 35 microns, the laser scanning speed is 1300mm/s, the lapping rate is 55%, the scanning distance is 110 microns, additive manufacturing processing is carried out, a molded sample piece with the density of 99.94% and the density of 3.3% beryllium modified Al22Fe24Co15Ni16Ti23 high-entropy alloy sample piece is obtained, the mechanical property is improved through a heat treatment mode of cold water quenching after heat preservation at 900 ℃ for 0.5 hour, and the mechanical property of the final sample piece is 1250Mpa and the hardness is 540 HV.
Comparative example 1:
the preparation of Al22Fe24Co15Ni16Ti23 high entropy alloy powder is further explained by taking as an example.
The preparation process comprises the following steps:
s1: preparing materials: the alloy raw material uses high-purity metals of aluminum, iron, cobalt, nickel and titanium. And (3) polishing the surface oxide layer before feeding, polishing, and drying in a vacuum drying oven at 120 ℃ for 3h for later use.
S2: smelting and atomizing to prepare powder, adding the dried raw materials into a crucible of a smelting chamber,
starting a vacuum system, vacuumizing the smelting chamber and the atomizing chamber to 10Pa, and then filling argon to atmospheric pressure.
Starting a smelting system, carrying out programmed induction heating of temperature rise, heat preservation, temperature reduction and heat preservation in a smelting chamber, setting the smelting power to be 100KW, raising the temperature from room temperature to 1200 ℃, synchronously heating the tundish to 1100 ℃, preserving the heat for 20min after the metal blocks in the crucible are completely melted, fully melting and mixing the metal blocks, and starting atomization.
Pouring the melt into a heated tundish, and introducing the mixed metal melt into an atomizing spray gun through a liquid guide pipe at the bottom of the tundish.
Argon is used as an atomizing medium, the atomizing pressure is adjusted to be 3.8MPa, the mixed metal melt is sprayed into an atomizing chamber by an atomizing spray gun and then is crushed into fine metal droplets by high-pressure argon, and alloy powder is obtained after cooling and solidification.
S3: performing powder classification on the alloy powder: and classifying the powder material according to the requirement of additive manufacturing powder, wherein the upper limit and the lower limit are respectively 15 micrometers and 53 micrometers, and obtaining a beryllium modified Al22Fe24Co15Ni16Ti23 high-entropy alloy powder finished product after the sieving is finished.
The powder adopts Renysha metal additive manufacturing equipment, the processing parameters of the metal additive manufacturing equipment are 300W of laser power, the thickness of a powder layer is 30 micrometers, the laser scanning speed is 1200mm/s, the lapping rate is 50%, the scanning distance is 100 micrometers, additive manufacturing processing is carried out, Al22Fe24Co15Ni16Ti23 high-entropy alloy sample pieces with the density of 90% of a formed sample piece are obtained, the mechanical property is improved through a heat treatment mode of cold water quenching after heat preservation for 0.5 hour at 800 ℃, and the mechanical property of the final sample piece is 1000Mpa and the hardness is 430 HV.
Comparative example 2:
the preparation of Al20Fe16Cr18Ni22Mn24 high entropy alloy powder is further explained by taking as an example.
The preparation process comprises the following steps:
s1: preparing materials: the alloy raw material uses high-purity metals such as aluminum, iron, chromium, nickel and manganese. And (3) polishing the surface oxide layer before feeding, polishing, and drying in a vacuum drying oven at 120 ℃ for 4h for later use.
S2: smelting and atomizing to prepare powder, adding the dried raw materials into a crucible of a smelting chamber,
starting a vacuum system, vacuumizing the smelting chamber and the atomizing chamber to 10Pa, and then filling argon to atmospheric pressure.
Starting a smelting system, carrying out programmed induction heating of temperature rise, heat preservation, temperature reduction and heat preservation in a smelting chamber, setting the smelting power to be 100KW, raising the temperature from room temperature to 1100 ℃, simultaneously synchronously heating the tundish to 1000 ℃, preserving the heat for 15min after the metal blocks in the crucible are completely melted, fully melting and mixing the metal blocks, and starting atomization.
Pouring the melt into a heated tundish, and introducing the mixed metal melt into an atomizing spray gun through a liquid guide pipe at the bottom of the tundish.
Argon is used as an atomizing medium, the atomizing pressure is adjusted to be 3.8MPa, the mixed metal melt is sprayed into an atomizing chamber by an atomizing spray gun and then is crushed into fine metal droplets by high-pressure argon, and alloy powder is obtained after cooling and solidification.
S3: performing powder classification on the alloy powder: and classifying the powder material according to the requirement of additive manufacturing powder, wherein the upper limit and the lower limit are respectively 15 micrometers and 53 micrometers, and obtaining the Al20Fe16Cr18Ni22Mn24 high-entropy alloy powder finished product after the screening is finished.
The powder adopts Renysha metal additive manufacturing equipment, the processing parameters of the metal additive manufacturing equipment are 270W, the powder layer thickness is 30 micrometers, the laser scanning speed is 1100mm/s, the lapping rate is 55 percent, the scanning distance is 105 micrometers, the additive manufacturing processing is carried out, Al20Fe16Cr18Ni22Mn24 high-entropy alloy sample pieces with the density of 85 percent of the formed sample pieces are obtained, the mechanical property is improved through a heat treatment mode of cold water quenching after heat preservation for 1 hour at 750 ℃, and the mechanical property of the final sample pieces reaches 950Mpa and the hardness is 420 HV.
Claims (10)
1. A method for modifying high-entropy alloy powder containing aluminum and iron components for additive manufacturing is characterized by comprising the following steps:
s1: preparing materials, namely preparing high-purity metal and beryllium, wherein the high-purity metal is 4-5 of aluminum, iron, cobalt, chromium, nickel, manganese and titanium, and the aluminum and iron elements account for 40-50% of the weight of the high-entropy alloy;
s2: smelting and atomizing to prepare powder, namely smelting high-purity metal and beryllium and then atomizing to prepare powder to obtain powder.
2. The method of modifying a high entropy alloy powder for additive manufacturing that contains aluminum and iron constituents of claim 1, wherein: and (S1) removing the oxide layer on the surface of the high-purity metal before preparing the high-purity metal, and drying for later use.
3. The method of modifying a high entropy alloy powder for additive manufacturing that contains aluminum and iron constituents of claim 1, wherein: in the step S2, the smelting temperature is 1100-1300 ℃, and atomization is carried out after the temperature is kept for 15-35 min for modification.
4. A method of modifying a high entropy alloy powder containing aluminium and iron components for additive manufacturing according to any one of claims 1-3, wherein: in the step S1, the mass fraction ratio of iron to beryllium is 7:1-9: 1.
5. The method of modifying a high entropy alloy powder containing aluminium and iron components for additive manufacturing of claim 4, wherein: the beryllium is high-purity beryllium beads.
6. The method of modifying a high entropy alloy powder for additive manufacturing that contains aluminum and iron constituents of claim 1, wherein: in step S2, the beryllium added is individually placed in a secondary feeding device.
7. The method for modifying a high-entropy alloy powder containing aluminum and iron components for additive manufacturing according to claim 1, wherein the step S2 is further followed by a powder classification step S3, S3: and classifying the powder material according to the requirement of additive manufacturing powder, and obtaining a beryllium modified high-entropy alloy powder finished product after screening, wherein the upper limit and the lower limit of the powder classification are 15 micrometers and 53 micrometers respectively.
8. High entropy alloy obtained from powder obtained from a high entropy alloy powder modification process comprising aluminium and iron constituents for additive manufacturing according to any of claims 1-7, wherein: and (3) performing additive manufacturing processing on the modified high-entropy alloy powder finished product by adopting metal additive manufacturing equipment to obtain a modified high-entropy alloy, wherein the density of the obtained molded sample piece can reach more than 99.9%.
9. A high entropy alloy as claimed in claim 8, wherein: the high-entropy alloy is subjected to heat treatment to improve the mechanical property, and is subjected to cold water quenching after heat preservation for 0.5-1 h at the temperature of 700-900 ℃, so that the mechanical property of a final sample piece can reach more than 1100MPa, and the hardness is more than 520 HV.
10. A high entropy alloy as claimed in claim 9, wherein: the high-entropy alloy is subjected to heat treatment to improve the mechanical property, and is subjected to cold water quenching after heat preservation for 0.5h at the temperature of 800 ℃, so that the mechanical property of a final sample piece can reach more than 1200Mpa, and the hardness is more than 530 HV.
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