CN116251965A - Method for improving magnetic performance of neodymium-iron-boron alloy manufactured by laser additive - Google Patents

Method for improving magnetic performance of neodymium-iron-boron alloy manufactured by laser additive Download PDF

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Publication number
CN116251965A
CN116251965A CN202310178625.6A CN202310178625A CN116251965A CN 116251965 A CN116251965 A CN 116251965A CN 202310178625 A CN202310178625 A CN 202310178625A CN 116251965 A CN116251965 A CN 116251965A
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scanning
laser
neodymium
boron alloy
iron
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林鑫
姚波
李翔宇
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Northwestern Polytechnical University
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Northwestern Polytechnical University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B22F10/364—Process control of energy beam parameters for post-heating, e.g. remelting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • B33Y40/20—Post-treatment, e.g. curing, coating or polishing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
    • H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention provides a method for improving the magnetic performance of neodymium-iron-boron alloy manufactured by laser additive, aiming at the neodymium-iron-boron alloy with a hard and brittle characteristic, cracking deformation is more easily generated due to the existence of thermal stress in the printing process, the method of the invention increases the stage of secondary scanning, the laser power and the scanning speed are changed in proportion on the basis of primary power in the process, and an optimal heat input interval can be obtained, so that cracking is reduced, the magnetic performance is improved, and especially the neodymium-iron-boron material which is easy to crack and has the hard and brittle characteristic is very sensitive to the heat input size, and the method has more applicability.

Description

Method for improving magnetic performance of neodymium-iron-boron alloy manufactured by laser additive
Technical Field
The invention belongs to the field of additive manufacturing of neodymium-iron-boron alloys, and particularly relates to a method for improving the magnetic performance of a neodymium-iron-boron alloy manufactured by laser additive.
Background
Neodymium iron boron permanent magnet materials have been developed into key support materials of new generation information technology, transportation and new energy automobiles and other emerging industries due to the excellent magnetic properties (high magnetic energy product, residual magnetism and coercive force). With the continuous development of the high and new technology industry, more urgent requirements are put forward on the integrated rapid preparation of the complex, miniaturized and integrated neodymium iron boron permanent magnet. In recent years, a laser additive manufacturing (Laser Additive Manufacturing:LAM) technology provides a technical foundation for direct manufacturing of high-precision and high-complexity components, and meets the requirements of rapid preparation of complex and personalized neodymium-iron-boron permanent magnets.
However, in laser additive manufacturing, a high energy density laser beam interacts with the metal material in a small area in a short time, creating a high temperature gradient and a large cooling rate under the strong heat exchange of the cold substrate around the melt pool. And the cracking sensitivity and the forming difficulty of the neodymium-iron-boron alloy manufactured by laser additive are further increased due to the hard and brittle characteristics of the neodymium-iron-boron material. And the nucleation of the reverse magnetization domain is easy to occur at the defect positions such as cracks, so that the magnetic performance of the NdFeB alloy is obviously deteriorated, and the application requirements of various fields are difficult to meet.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for improving the magnetic performance of a neodymium-iron-boron alloy manufactured by laser additive, so as to solve the problem that the conventional neodymium-iron-boron magnet manufactured by additive is difficult to meet the requirements of a plurality of application fields on the magnetic performance of the neodymium-iron-boron magnet.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a method for improving the magnetic performance of neodymium-iron-boron alloy manufactured by laser additive,
step 1, melting through a laser selective area, stacking and forming M layers of neodymium iron boron alloys, wherein the laser power is P, the scanning speed is V, and the M is 1-5;
step 2, performing secondary laser in-situ scanning on the M-layer neodymium iron boron alloy, wherein the laser power of the secondary laser in-situ scanning is 5-50% P, and the scanning speed is V/2-V;
step 3, repeating the step 1 and the step 2; until printing is completed.
The invention further improves that:
preferably, in step 1, the laser power P is 50 to 500W.
Preferably, in the step 1, the scanning speed V is 200-2000 mm/s.
Preferably, in step 1, the scanning strategy of the selective laser melting includes an intra-layer rotation angle and a scanning path, and an inter-layer rotation angle and a scanning path.
Preferably, in step 2, the scanning strategy of the secondary laser in-situ scanning includes an intra-layer rotation angle and a scanning path, and an inter-layer rotation angle and a scanning path.
Preferably, in the step 2, the laser power of the secondary laser in-situ scanning is 5% P-50% P.
Preferably, inert gas is introduced during the whole printing process.
Preferably, the oxygen content in the printing environment is less than 100ppm throughout the printing process.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for improving the magnetic performance of neodymium-iron-boron alloy manufactured by laser additive, aiming at the neodymium-iron-boron alloy with a hard and brittle characteristic, cracking deformation is more easily generated due to the existence of thermal stress in the printing process, the method of the invention increases the stage of secondary scanning, the laser power and the scanning speed are changed in proportion on the basis of primary power in the process, and an optimal heat input interval can be obtained, so that cracking is reduced, the magnetic performance is improved, and especially the neodymium-iron-boron material which is easy to crack and has the hard and brittle characteristic is very sensitive to the heat input size, and the method has more applicability. The method fundamentally solves the problem that the neodymium-iron-boron alloy manufactured by laser additive is easy to crack; the temperature field uniformity inside the sample is improved through laser in-situ secondary scanning, the cracking tendency of the neodymium-iron-boron alloy manufactured by laser additive is greatly reduced, the neodymium-iron-boron alloy manufactured by laser additive with low crack density is obtained, the magnetic performance of the neodymium-iron-boron alloy manufactured by laser additive is remarkably improved, and the neodymium-iron-boron alloy has wide application prospects in the high-end manufacturing fields such as aerospace, biomedical and the like.
Drawings
FIG. 1 is a graph showing the detection result of X-ray tomography (CT) of internal defects of NdFeB alloy manufactured by laser additive;
FIG. 2 shows the internal defect detection results of NdFeB alloy manufactured by adding a laser additive with a secondary scanning;
fig. 3 shows the magnetic properties of the neodymium-iron-boron alloy obtained by the two processes. Wherein (a) is coercivity-remanence; the graph (b) is the maximum magnetic energy product.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures and to specific examples:
in the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
One of the embodiments of the invention discloses a method for improving the magnetic performance of neodymium iron boron alloy manufactured by laser additive, which comprises the following steps:
step 1: laser additive manufacturing printing by neodymium iron boron powder
And (3) adopting a laser additive manufacturing technology, and carrying out laser scanning once according to a two-dimensional slice model of the target component to finish single-layer or multi-layer NdFeB powder selective melting printing. Wherein the laser scanning parameters include: technological parameters such as laser power, scanning speed, scanning strategy and the like;
the specific process is as follows: establishing a three-dimensional CAD model according to the shape of the part to be printed; slicing and layering the model by using slicing software, and inputting the model into a laser additive manufacturing system; selecting proper technological parameters and scanning strategies to enable powder in a scanning area to be melted and solidified under the action of a laser beam; repeating the steps, and stacking the solid parts layer by layer to form the solid parts consistent with the target model.
The laser process parameters are as follows: the laser power is 50-500W; the scanning speed is 200-2000 mm/s; the scanning strategy comprises an intra-layer or inter-layer rotation angle and a scanning path;
step 2: in situ secondary scanning of a print zone
And carrying out in-situ secondary scanning on the printed area by adopting secondary laser power. Wherein, the secondary laser scanning parameters include: laser power, scanning speed, scanning strategy, scanning interval layer number and other technological parameters;
the in-situ secondary laser scanning process parameters are as follows: the laser power range is 5-50% P (W), and P is single-layer printing laser power; the scanning speed is V/2-V (mm/s), and V is the single-layer printing scanning speed; the scanning strategy comprises an intra-layer laser scanning path, an inter-layer scanning angle and an inter-layer scanning angle; the number of secondary scanning interval layers is 1-5; the criterion for controlling the laser power and the scanning speed in the secondary scanning process is that the heat input cannot be excessive, because the excessive heat input can cause large thermal stress, and the cracking tendency of the material is increased. A relatively low laser power and a relatively fast scanning speed are chosen. For the selection of the secondary scanning interval layer number, when the primary scanning power is lower, the interval layer number is small, and when the primary scanning power is higher, the interval layer number is large. The preferred coordination scheme is a lower one-time scan power and small-interval layer number coordination.
From the aspect of power selection in the actual printing process, as the laser power increases, defects decrease first and then increase, and magnetic properties appear to increase first and then decrease. Especially, when the secondary laser power exceeds 40% of the primary power, the magnetic property is more seriously degraded. Thus, the definition for low laser power is 5-50% of the one-pass power, i.e., 5% P-50% P (W).
And (3) repeating the steps 1-2 to finish the preparation of the neodymium-iron-boron alloy by laser additive manufacturing.
Wherein, in the whole printing process, inert gases (argon and helium) are required to be introduced into a printing cabin; because of the easy oxidation property of the neodymium-iron-boron alloy, the printing process is ensured to be carried out in a low-oxygen (the oxygen content is less than 100 ppm) environment, and the performance degradation of the neodymium-iron-boron alloy caused by oxygen is avoided.
The difficulty of the present invention is that the printed alloy material itself has different characteristics. At present, for structural materials such as nickel-based superalloy, titanium alloy, aluminum alloy and the like, additive manufacturing technology is mature, in-situ secondary scanning is utilized to focus on a scanning strategy (improve temperature field distribution), and selection of secondary scanning parameters is not very concerned. The neodymium iron boron material which is easy to crack is very sensitive to heat input, so that the selection of laser power and scanning speed in the secondary scanning process is very important by adopting an additive manufacturing technology. When the first layer is printed, selecting a suitable low laser power secondary scan reduces the cooling rate during solidification, thereby reducing cracking. If the power is selected too much, which corresponds to re-melting and solidification, new thermal stresses are regenerated and metallurgical defects cannot be ameliorated.
Example 1
In the process of manufacturing the neodymium-iron-boron alloy by using the laser additive, the laser power is 120W, the scanning speed is 1200mm/s, the scanning strategy is in-layer reciprocating scanning, and the interlayer rotating scanning angle is 67 degrees; the secondary laser scanning process parameters are as follows: the laser power is 24W; the scanning speed is 1200mm/s; scanning strategy layer back and forth, rotating the scanning angle between layers 67 degrees; the number of secondary scanning interval layers is 1. As can be seen from comparing the CT results of fig. 1 and fig. 2, the size and number of cracks in the sample after laser secondary scanning are greatly reduced; meanwhile, the interlayer rotation scanning strategy improves the uniformity of temperature distribution, and the unfused defects are reduced to a certain extent. As shown in FIG. 3, the magnetic performance of the neodymium-iron-boron alloy is obviously improved after laser in-situ secondary scanning, and the maximum magnetic energy product is 86kJ/m < 3 >, so that the neodymium-iron-boron alloy is the optimal magnetic energy product for the current laser additive manufacturing.
Example 2
In the process of manufacturing the neodymium-iron-boron alloy by laser additive, the laser power is 50W, the scanning speed is 200mm/s, the scanning strategy is in-layer reciprocating scanning, and the interlayer rotating scanning angle is 67 degrees; the secondary laser scanning process parameters are as follows: the laser power was 25W (50% p); the scanning speed is 200mm/s (V); scanning strategy layer back and forth, rotating the scanning angle between layers 67 degrees; the number of secondary scanning interval layers is 1.
Example 3
In the process of manufacturing the neodymium-iron-boron alloy by using the laser additive, the laser power is 120W, the scanning speed is 1200mm/s, the scanning strategy is in-layer reciprocating scanning, and the interlayer rotating scanning angle is 90 degrees; the secondary laser scanning process parameters are as follows: the laser power was 36W (30% p); the scanning speed is 1200mm/s; scanning strategy layer back and forth, rotating the scanning angle between layers by 90 degrees; the number of secondary scanning interval layers is 1.
Example 4
In the process of manufacturing the neodymium-iron-boron alloy by laser additive, the laser power is 180W, the scanning speed is 1200mm/s, the scanning strategy is intra-layer reciprocating scanning, and the inter-layer rotating scanning angle is 67 degrees; the secondary laser scanning process parameters are as follows: the laser power was 90W (50% p); the scanning speed is 1200mm/s; scanning strategy layer back and forth, rotating the scanning angle between layers 67 degrees; the number of secondary scanning interval layers is 2.
Example 5
In the process of manufacturing the neodymium-iron-boron alloy by laser additive, the laser power is 180W, the scanning speed is 1200mm/s, the scanning strategy is in-layer reciprocating scanning, and the interlayer rotating scanning angle is 90 degrees; the secondary laser scanning process parameters are as follows: the laser power was 45W (25% p); the scanning speed is 960mm/s (80% V); scanning strategy layer back and forth, rotating the scanning angle between layers by 90 degrees; the number of secondary scanning interval layers is 2.
Example 6
In the process of manufacturing the neodymium-iron-boron alloy by laser additive, the laser power is 200W, the scanning speed is 800mm/s, the scanning strategy is in-layer reciprocating scanning, and the interlayer rotating scanning angle is 90 degrees; the secondary laser scanning process parameters are as follows: the laser power was 80W (40% p); the scanning speed is 720mm/s (90% V); scanning strategy layer back and forth, rotating the scanning angle between layers by 90 degrees; the number of secondary scanning interval layers is 3.
Example 7
In the process of manufacturing the neodymium-iron-boron alloy by laser additive, the laser power is 200W, the scanning speed is 800mm/s, the scanning strategy is in-layer reciprocating scanning, and the interlayer rotating scanning angle is 67 degrees; the secondary laser scanning process parameters are as follows: the laser power is 40W (20%); the scanning speed is 400mm/s (50%); scanning strategy layer back and forth, rotating the scanning angle between layers 67 degrees; the number of secondary scanning interval layers is 5.
Example 8
In the process of manufacturing the neodymium-iron-boron alloy by laser additive, the laser power is 500W, the scanning speed is 2000mm/s, the scanning strategy is in-layer reciprocating scanning, and the interlayer rotating scanning angle is 67 degrees; the secondary laser scanning process parameters are as follows: the laser power is 25W (5%); the scanning speed is 1200mm/s (60%); scanning strategy layer back and forth, rotating the scanning angle between layers 67 degrees; the number of secondary scanning interval layers is 5.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (8)

1. The method for improving the magnetic performance of the neodymium-iron-boron alloy manufactured by laser additive is characterized by comprising the following steps of:
step 1, melting through a laser selective area, stacking and forming M layers of neodymium iron boron alloys, wherein the laser power is P, the scanning speed is V, and the M is 1-5;
step 2, performing secondary laser in-situ scanning on the M-layer neodymium iron boron alloy, wherein the laser power of the secondary laser in-situ scanning is 5-50% P, and the scanning speed is V/2-V;
step 3, repeating the step 1 and the step 2; until printing is completed.
2. The method for improving the magnetic performance of a neodymium iron boron alloy manufactured by laser additive according to claim 1, wherein in the step 1, the laser power P is 50-500W.
3. The method for improving the magnetic performance of neodymium iron boron alloy manufactured by laser additive according to claim 1, wherein in the step 1, the scanning speed V is 200-2000 mm/s.
4. A method for improving the magnetic properties of a neodymium iron boron alloy manufactured by laser additive according to claim 1, wherein in the step 1, the scanning strategy of selective laser melting comprises an intra-layer rotation angle and a scanning path, and an inter-layer rotation angle and a scanning path.
5. A method for improving magnetic properties of a neodymium iron boron alloy by laser additive manufacturing according to claim 1, wherein in step 2, the scanning strategy of the secondary laser in-situ scanning comprises an in-layer rotation angle and a scanning path, and an inter-layer rotation angle and a scanning path.
6. The method for improving the magnetic performance of the neodymium iron boron alloy manufactured by laser additive according to claim 1, wherein in the step 2, the laser power of the secondary laser in-situ scanning is 5-50% P.
7. The method for improving the magnetic performance of the neodymium iron boron alloy manufactured by laser additive according to claim 1, wherein inert gas is introduced in the whole printing process.
8. The method of any one of claims 1-7, wherein the oxygen content of the printing environment is less than 100ppm throughout the printing process.
CN202310178625.6A 2023-02-28 2023-02-28 Method for improving magnetic performance of neodymium-iron-boron alloy manufactured by laser additive Pending CN116251965A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117884649A (en) * 2024-03-18 2024-04-16 兰州理工大学 Laser additive manufacturing process of magnetostrictive material iron-gallium alloy
CN117884649B (en) * 2024-03-18 2024-05-14 兰州理工大学 Laser additive manufacturing process of magnetostrictive material iron-gallium alloy

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117884649A (en) * 2024-03-18 2024-04-16 兰州理工大学 Laser additive manufacturing process of magnetostrictive material iron-gallium alloy
CN117884649B (en) * 2024-03-18 2024-05-14 兰州理工大学 Laser additive manufacturing process of magnetostrictive material iron-gallium alloy

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