CN110508805A - A kind of composite powder and the preparation method and application thereof being able to achieve 7075 aluminium alloy flawless SLM forming - Google Patents
A kind of composite powder and the preparation method and application thereof being able to achieve 7075 aluminium alloy flawless SLM forming Download PDFInfo
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- CN110508805A CN110508805A CN201910928754.6A CN201910928754A CN110508805A CN 110508805 A CN110508805 A CN 110508805A CN 201910928754 A CN201910928754 A CN 201910928754A CN 110508805 A CN110508805 A CN 110508805A
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
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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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- 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
- B33Y70/00—Materials specially adapted for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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Abstract
The invention discloses a kind of composite powders and the preparation method and application thereof for being able to achieve 7075 aluminium alloy flawless SLM forming.This method comprises: nano-ceramic particle, sub-micron hydride particle, 7075 Al alloy powders and ball-milling medium are added in vacuum ball grinder, the ball milling in inert gas, the composite powder for being able to achieve 7075 aluminium alloy flawless SLM forming is obtained.Preparation method of the invention is simple and efficient, cost is relatively low, and 7075 aluminium alloy compound powder oxygen content of diphase particles obtained modification are low, and matrix powder keeps preferable sphericity, good fluidity also very well satisfies requirement of the 3D printing to powder property while realizing flawless SLM forming.Its sub-micron hydride particle generates the heterogeneous forming core that nucleating agent promotes melt by reaction in-situ in melting process, refines crystal grain；Nano-ceramic particle can also promote the heterogeneous forming core of melt as nucleating agent, while nano-ceramic particle also functions to the effect of reinforced phase.
Description
Technical field
The invention belongs to metal 3D printing and its technical field of material, and in particular to one kind is able to achieve 7075 aluminium alloys
The composite powder and the preparation method and application thereof of flawless SLM forming.
Background technique
With lightweight, the growth in strong demand of structure-function integration, 7075 aluminum alloy complex precision components are in space flight
The fields such as aviation are widely used, but for some shaped pieces, complex thin-wall structural member, traditional diamond-making technique is difficult to prepare.Swash
Light selective melting shape (SLM) technology due to can it is once-forming go out labyrinth part, be to prepare such 7075 aluminium alloy
The most promising new method of part.
However, 7075 aluminium alloys are high to laser reflectivity, thermal conductivity is big, contain more easy scaling loss element, and setting temperature area
Between it is wide, easily form coarse column crystal and fire check in the rapid solidification of SLM forming, and crackle in stress easily along
Crystal boundary extension, the mechanical property for causing SLM to shape 7075 articles made of aluminium alloy are extremely low (100MPa or so).
Domestic and foreign scholars have certain achievement, but main collection for the SLM research work for shaping 7075 aluminium alloys at present
In add heterogeneous nucleating agent to refine crystal grain in regulation SLM technological parameter and outside, the problems such as that there are still consistency is low, hot tearing, mechanics
Performance is relatively low.It is shaped for example, Hamburg, Germany polytechnical university obtains SLM of the consistency greater than 99% by Optimizing Process Parameters
7075 aluminum alloy specimens (Influence of process parameters on the quality of aluminum
7075 using selective laser melting of alloy EN AW), but sample there are still fire check and is preheating to 200
It DEG C can not also eliminate, tensile strength only has 206MPa；The laboratory HRL of California, USA university is existed by electrostatic assembly technology
ZrH is introduced in Al7075 powder2To refine 7075 aluminium alloy crystal grain (the 3D printing of high- of SLM forming
Strength aluminum alloys), although solving the problems, such as hot tearing to a certain extent, due in drip molding
There are more hole, mechanical property is relatively low in portion, and wherein tensile strength highest also only has 417MPa, far below traditional ingot metallurgy
The tensile strength (550MPa or more) of 7075 aluminum alloy materials of method preparation.
On the other hand, existing composite powder technology of preparing is there is also obvious deficiency, as: prepared by electrostatic assembly method it is compound
The oxygen content of powder is not easy to control, at high cost；Mechanical alloying method can seriously destroy the sphericity of alloy powder, reduce powder stream
Dynamic property is unfavorable for SLM forming；Salt-mixture reaction bonded gas atomization is many and diverse, and the number of species for the reinforced phase that can be introduced
It is limited.
Summary of the invention
In view of the above problems in the related art, main purpose of the invention is to provide one kind and is able to achieve 7075 aluminium alloys
The composite powder and the preparation method and application thereof of flawless SLM forming.
The composite powder provided by the invention for being able to achieve 7075 aluminium alloy flawless SLM forming, by 7075 Al alloy powders
Assemble through nano-ceramic particle and sub-micron hydride particle, sub-micron TiH2Particle passes through in situ anti-in melting process
Al should be generated3Ti plays nucleating agent, and the heterogeneous forming core of melt is promoted to make crystal grain refinement；Nanometer TiB2In forming process
The heterogeneous forming core of melt can be promoted to refine crystal grain, meanwhile, TiB2The intensity that 3D printing product can also be promoted as ceramic phase is hard
Degree, plays the role of reinforced phase.Sub-micron TiH2Particle and nanometer TiB2Particle synergistic effect improves melt solidification model, refinement
Crystal grain is organized, the fire check for inhibiting 7075 aluminium alloys to be formed during 3D printing.
The purpose of the present invention is realized at least through one of following technical solution.
A kind of preparation method of composite powder being able to achieve 7075 aluminium alloy flawless SLM forming provided by the invention, packet
Include following steps:
Under inert gas protection by nano-ceramic particle, sub-micron hydride particle, 7075 Al alloy powders and ball-milling medium
It is added in vacuum ball grinder, then sealing carries out ball-milling treatment, in abrading-ball, powder and ball grinder under the protection of inert gas
Make sub-micron hydride particle in the knockout process repeatedly of inner wall and nano-ceramic particle is evenly dispersed is fitted to 7075 aluminium alloys
In matrix powder, 7075 aluminium of the preferable nano-ceramic particle of matrix sphericity and the modification of sub-micron hydride particle two-phase are obtained
Alloy composite powder (composite powder for being able to achieve 7075 aluminium alloy flawless SLM forming).
Further, the nano-ceramic particle is TiB2Particle, the average grain diameter of the nano-ceramic particle are 50nm,
The nano-ceramic particle is in irregular shape.
Further, the sub-micron hydride particle is TiH2Particle, the average grain of the sub-micron hydride particle
Diameter is 500nm, and the sub-micron hydride particle is in irregular pattern.
Further, the 7075 Al alloy powder particle is spherical in shape or subsphaeroidal, and partial size is 15-53 μm.
Further, the ball-milling medium is stainless steel ball or sintered carbide ball.
Further, the inert gas is argon gas or helium.
Preferably, the vacuum ball mill is planetary ball mill.
Further, the revolving speed of the ball-milling treatment is 130 ~ 140r/min, and the time of ball-milling treatment is 3-5h, ball material
Mass ratio is that the mass ratio of 4-6:1(i.e. ball-milling medium and raw material is 4-6:1, and the raw material includes nano-ceramic particle, sub-micron
Hydride particle, 7075 Al alloy powders).Any process control agent is not added in mechanical milling process, in hitting repeatedly for ball-milling medium
It hitting down, nano-ceramic particle and sub-micron hydride particle are evenly spread on 7075 alloy matrix aluminum powder of micron order, and with
Matrix powder surface is entrenched togather, so that nano-ceramic particle and sub-micron hydride particle are embedded into 7075 aluminium of micron order
Alloy substrate powder surface.
Preferably, the ball-milling medium includes two kinds of sizes of big abrading-ball and small abrading-ball, wherein and the partial size of big abrading-ball is 9 ~
11mm, the partial size of small abrading-ball are 5 ~ 6mm, and the mass ratio of size abrading-ball is 1:1.
Further, in the composite powder for being able to achieve 7075 aluminium alloy flawless SLM forming, nano-ceramic particle
Mass fraction be 0.8wt%-1.0wt%, the mass fraction of sub-micron hydride particle is 0.6wt%-1.4wt%, and 7075 aluminium close
The mass fraction at bronze end is 97.6wt%-98.6wt%.
Preferably, in the composite powder for being able to achieve 7075 aluminium alloy flawless SLM forming, sub-micron hydride
The mass fraction of grain is 0.6wt%, 1wt% or 1.4wt%.
Preferably, in the composite powder for being able to achieve 7075 aluminium alloy flawless SLM forming, nano-ceramic particle
Mass fraction is 0.8wt% or 1.0wt%.
The present invention provide it is a kind of be able to achieve as made from above-mentioned preparation method 7075 aluminium alloy flawless SLM forming answer
Powder is closed, partial size is 15-50 μm, oxygen content < 1000ppm.
The composite powder provided by the invention for being able to achieve 7075 aluminium alloy flawless SLM forming can be applied in preparation SLM
In drip molding.
The present invention provides a kind of composite powder preparation method for being able to achieve 7075 aluminium alloy flawless SLM forming and answer
With.The composite powder is made of 7075 Al alloy powder of micron order and sub-micron hydride particle, nano-ceramic particle, the Central Asia
Micron hydride particle generates the heterogeneous forming core that nucleating agent promotes melt by reaction in-situ in melting process, refines crystal grain；
Nano-ceramic particle can also promote the heterogeneous forming core of melt as nucleating agent, while nano-ceramic particle also functions to the work of reinforced phase
With.
A kind of composite powder being able to achieve 7075 aluminium alloy flawless SLM forming provided by the invention can realize that 7075 aluminium close
The flawless SLM forming of gold, while it is tiny to shape sample microstructure crystal grain.The preparation step of the composite powder is as follows: will receive
Rice ceramic particle, sub-micron hydride particle, 7075 Al alloy powder of micron order and ball-milling medium add under inert gas protection
Enter and sealed in vacuum ball grinder, and be passed through into vacuum ball grinder inert gas and form protection, then using planetary ball mill into
Low energy ball milling obtains composite powder to row in short-term.Preparation method of the invention is simple and efficient, and cost is relatively low, and diphase particles obtained
It is low to modify 7075 aluminium alloy compound powder oxygen content, matrix powder keeps preferable sphericity, and good fluidity is realizing flawless
SLM also very well satisfies requirement of the 3D printing to powder property while forming.
A kind of nano-ceramic particle being able to achieve flawless SLM forming and sub-micron hydride particle provided by the invention are double
Mutually 7075 aluminium alloy compound powder of modification, compared with prior art, the feature and excellent effect protruded are:
(1) composite powder provided by the invention closes 7075 aluminium by introducing nano-ceramic particle and sub-micron hydride particle
Bronze end is modified, and obtains a kind of composite powder for being able to achieve 7075 aluminium alloy flawless SLM forming, improves SLM forming
The solidification model of melt during 7075 aluminium alloys, grain growth are tiny equiax crystal, reduce its hot tearing sensibility, realize
The flawless SLM of 7075 aluminium alloys shapes；
(2) preparation method provided by the invention, by the powder after being mixed on mixed powder machine in moderate ratio of grinding media to material, compared with the slow-speed of revolution, compared with
Ball milling is carried out under short time and inert atmosphere, by abrading-ball and abrading-ball, the continuous frictional impact of abrading-ball and ball milling top tank structure will be hard
Crisp nano-ceramic particle and sub-micron hydride is embedded in relatively soft micron Al alloy powder surface, to realize that nanometer is made pottery
The compound assembling of porcelain particle, sub-micron hydride particle and micron aluminium alloy powder, while the composite powder still keeps preferable
Sphericity, mobility, and powder is reduced to the reflectivity of laser, improve the comprehensive mechanical property of SLM drip molding.The present invention
The composite powder preparation method of offer is simple and efficient, and is able to achieve the flawless SLM forming of 7075 aluminium alloys, relative to existing
Composite powder technology of preparing has a clear superiority.
Detailed description of the invention
Fig. 1 a is the nano-ceramic particle prepared in the embodiment of the present invention 1 and the modification of sub-micron hydride particle two-phase
The microstructure figure of 7075 aluminium alloy compound powder of 3D printing；
Fig. 1 b beats for the 3D for nano-ceramic particle and sub-micron hydride particle the two-phase modification prepared in the embodiment of the present invention 2
Print the microstructure figure of 7075 aluminium alloy compound powder；
Fig. 1 c beats for the 3D for nano-ceramic particle and sub-micron hydride particle the two-phase modification prepared in the embodiment of the present invention 3
Print the microstructure figure of 7075 aluminium alloy compound powder；
Fig. 2 a, Fig. 2 b are respectively that the forming of 7075 aluminium alloy compound powder 3D printings made from the embodiment of the present invention 1 face sample XOY exists
The displaing micro tissue topography of different amplification schemes；
Fig. 2 c, Fig. 2 d are respectively that the forming of 7075 aluminium alloy compound powder 3D printings made from the embodiment of the present invention 2 face sample XOY exists
The displaing micro tissue topography of different amplification schemes；
Fig. 2 e, Fig. 2 f are respectively that the forming of 7075 aluminium alloy compound powder 3D printings made from the embodiment of the present invention 3 face sample XOY exists
The displaing micro tissue topography of different amplification schemes；
Fig. 3 is displaing micro tissue topography's figure that typical pure 7075 Al alloy powder 3D printing shapes the face sample XOY.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail, and embodiments of the present invention are not limited thereto.
Embodiment 1
A kind of preparation method for the composite powder being able to achieve 7075 aluminium alloy flawless SLM forming, includes the following steps:
A, 600g stainless steel ball is added into 500ml stainless-steel vacuum ball grinder, wherein big bulb diameter is 10mm, the small ball's diameter
For 6mm, the mass ratio of big ball and bead is 1:1.
B, the TiH that average grain diameter is 500nm is weighed in the vacuum glove box of argon atmosphere2Powder 1.68g, average grain diameter
For the TiB of 50nm2The 7075 Al alloy powder 117.36g that powder 0.96g and partial size are 15-53 μm are placed in plastic containers, so
Plastic containers are sealed afterwards and are placed on premixing flour 3h on V-type meal mixer.
C, mixed-powder is placed in vacuum ball grinder in vacuum glove box after mixing powder, and vacuum ball grinder is twisted
Close envelope.
D, argon gas protection is filled with into vacuum ball grinder.
E, vacuum ball grinder is placed in progress low energy ball milling on planetary ball mill.Ball milling parameter are as follows: revolving speed 135r/min,
Ball-milling Time 3h.Every ball milling 30min shuts down 10min.
F, cooling to vacuum ball grinder after ball milling, it is (described to be able to achieve to be placed in taking-up composite granule in vacuum glove box
The composite powder of 7075 aluminium alloy flawless SLM forming), and Vacuum Package is carried out, the microstructure figure of the composite powder is as schemed
Shown in 1a, it can be found that matrix powder is spherical in shape or subsphaeroidal, sphericity is high, and particle is uniformly entrenched in matrix powder, shape
At the good composite powder of assembling effect (composite powder for being able to achieve 7075 aluminium alloy flawless SLM forming).
G, by the composite powder prepared (its mass fraction are as follows: Al alloy powder 97.8wt%, TiH21.4wt%, TiB2
It 0.8wt%) is dried in vacuo 4h at 60 DEG C, then carries out forming experiment on the selective laser EOS M290 fusing former.Swash
Optical power is 180W, scanning speed 250mm/s, and 90 μm of sweep span, 30 μm of powdering thickness, it is good to finally obtain forming effect
Containing a small amount of Ti and TiB27075 aluminum alloy materials, displaing micro tissue topography scheme as shown in Fig. 2 a, Fig. 2 b, it can be found that sample
It is (described to contain a small amount of Ti and TiB27075 aluminum alloy materials) crystal grain is tiny and in the shaft-like such as close, with 7075 aluminium alloy SLM of standard
Forming sample (as shown in Figure 3) is compared, due to solidification temperature range it is wide caused by the netted hot tearing that is generated in process of setting
Line has completely disappeared.Described it will contain a small amount of Ti and TiB27075 aluminum alloy materials heat treatment (i.e. at 470 DEG C be dissolved 2h and
Timeliness 18h at 120 DEG C；Tension test similarly hereinafter) is carried out afterwards, and measuring its tensile strength is 532.6MPa, elongation percentage 12.7%.
Embodiment 2
A kind of preparation method for the composite powder being able to achieve 7075 aluminium alloy flawless SLM forming, includes the following steps:
A, 720g stainless steel ball is added into 500ml stainless-steel vacuum ball grinder, wherein big bulb diameter is 10mm, the small ball's diameter
For 6mm, the mass ratio of big ball and bead is 1:1.
B, the TiH that average grain diameter is 500nm is weighed in the vacuum glove box of argon atmosphere2Powder 1.2g, average grain diameter
For the TiB of 50nm2The 7075 Al alloy powder 117.84g that powder 0.96g and partial size are 15-53 μm are placed in plastic containers, so
Plastic containers are sealed afterwards and are placed on premixing flour 3h on V-type meal mixer.
C, mixed-powder is placed in vacuum ball grinder in vacuum glove box after mixing powder, and vacuum ball grinder is twisted
Close envelope.
D, argon gas protection is filled with into vacuum ball grinder.
E, vacuum ball grinder is placed in progress low energy ball milling on planetary ball mill.Ball milling parameter are as follows: revolving speed 130r/min,
Ball-milling Time is 5h；Every ball milling 30min shuts down 10min；
F, cooling to vacuum ball grinder after ball milling, it is (described to be able to achieve 7075 to be placed in taking-up composite granule in vacuum glove box
The composite powder of aluminium alloy flawless SLM forming), and Vacuum Package is carried out, the microstructure figure of the composite powder such as Fig. 1 b institute
Show, it can be found that matrix powder is spherical in shape or subsphaeroidal, sphericity is high, and particle is uniformly entrenched in matrix powder, forms
The good composite powder of assembling effect (composite powder for being able to achieve 7075 aluminium alloy flawless SLM forming)；
G, by the composite powder prepared (its mass fraction are as follows: Al alloy powder 98.2wt%, TiH21wt%, TiB20.8wt%)
It is dried in vacuo 4h at 60 DEG C, then carries out forming experiment on the selective laser EOS M290 fusing former.Laser power
90 μm of sweep span, 30 μm of powdering thickness, it is good containing a small amount of Ti to finally obtain forming effect by 180W, scanning speed 250mm/s
And TiB27075 aluminum alloy materials, displaing micro tissue topography schemes as shown in Fig. 2 c, Fig. 2 d, (described containing lacking it can be found that sample
Measure Ti and TiB27075 aluminum alloy materials) crystal grain is tiny and in the shaft-like such as close, (such as with pure 7075 aluminium alloy SLM forming sample
Shown in Fig. 3) it compares, since the netted fire check that generates in process of setting has disappeared completely caused by solidification temperature range is wide
It loses.A small amount of Ti and TiB will be contained27075 aluminum alloy materials heat treatment after carry out tension test, measuring its tensile strength is
524.3MPa, elongation percentage 13.4%.
Embodiment 3
A kind of preparation method for the composite powder being able to achieve 7075 aluminium alloy flawless SLM forming, includes the following steps:
A, 480g stainless steel ball is added into 500ml stainless-steel vacuum ball grinder, wherein big bulb diameter is 10mm, the small ball's diameter
For 6mm, the mass ratio of big ball and bead is 1:1.
B, the TiH that average grain diameter is 500nm is weighed in the vacuum glove box of argon atmosphere2Powder 0.72g, average grain diameter
For the TiB of 50nm2The 7075 Al alloy powder 118.32g that powder 0.96g and partial size are 15-53 μm are placed in plastic containers, so
Plastic containers are sealed afterwards and are placed on premixing flour 3h on V-type meal mixer.
C, mixed-powder is placed in vacuum ball grinder in vacuum glove box after mixing powder, and vacuum ball grinder is twisted
Close envelope.
D, argon gas protection is filled with into vacuum ball grinder.
E, vacuum ball grinder is placed in progress low energy ball milling on planetary ball mill.Ball milling parameter are as follows: revolving speed 140r/min,
Ball-milling Time is 4h.Every ball milling 30min shuts down 10min.
F, cooling to vacuum ball grinder after ball milling, it is (described to be able to achieve to be placed in taking-up composite granule in vacuum glove box
The composite powder of 7075 aluminium alloy flawless SLM forming), and Vacuum Package is carried out, the microstructure figure of the composite powder is as schemed
Shown in 1c, it can be found that matrix powder is spherical in shape or subsphaeroidal, sphericity is high, and particle is uniformly entrenched in matrix powder, shape
At the good composite powder of assembling effect (composite powder for being able to achieve 7075 aluminium alloy flawless SLM forming)；
G, by the composite powder prepared (its mass fraction are as follows: Al alloy powder 98.6wt%, TiH20.6wt%,
TiB2It 0.8wt%) is dried in vacuo 4h at 60 DEG C, reality then is formed on the selective laser EOS M290 fusing former
It tests.90 μm of sweep span, 30 μm of powdering thickness, it is good to finally obtain forming effect by laser power 180W, scanning speed 250mm/s
Good contains a small amount of Ti and TiB27075 aluminum alloy materials, displaing micro tissue topography scheme as shown in Fig. 2 e, Fig. 2 f, it can be found that sample
Product are (described to contain a small amount of Ti and TiB27075 aluminum alloy materials) crystal grain is tiny and in the shaft-like such as close, with pure 7075 aluminium alloy SLM
Forming sample (as shown in Figure 3) is compared, due to solidification temperature range it is wide caused by the netted hot tearing that is generated in process of setting
Line has completely disappeared.Described it will contain a small amount of Ti and TiB27075 aluminum alloy materials heat treatment after carry out tension test, measure it
Tensile strength is 509.2MPa, elongation percentage 12.9%.
Above embodiments are only preferrred embodiment of the present invention, for explaining only the invention, are not intended to limit the present invention, this
Field technical staff should belong to guarantor of the invention without departing from change made under spirit of the invention, replacement, modification etc.
Protect range.
Claims (10)
1. it is a kind of be able to achieve 7075 aluminium alloy flawless SLM forming composite powder preparation method, which is characterized in that including with
Lower step:
Under inert gas protection by nano-ceramic particle, sub-micron hydride particle, 7075 Al alloy powders and ball-milling medium
It is added in vacuum ball grinder, ball-milling treatment is then carried out under the protection of inert gas, obtain described being able to achieve 7075 aluminium alloys
The composite powder of flawless SLM forming.
2. the preparation method of the composite powder according to claim 1 for being able to achieve 7075 aluminium alloy flawless SLM forming,
It is characterized in that, the nano-ceramic particle is TiB2Particle, the average grain diameter of the nano-ceramic particle are 50nm, the nanometer
Ceramic particle is in irregular shape.
3. the preparation method of the composite powder according to claim 1 for being able to achieve 7075 aluminium alloy flawless SLM forming,
It is characterized in that, the sub-micron hydride particle is TiH2The average grain diameter of particle, the sub-micron hydride particle is
500nm, the sub-micron hydride particle are in irregular shape.
4. the preparation method of the composite powder according to claim 1 for being able to achieve 7075 aluminium alloy flawless SLM forming,
It is characterized in that, the 7075 Al alloy powder particle is spherical in shape or subsphaeroidal, and the partial size of 7075 Al alloy powder is 15-53
μm。
5. the preparation method of the composite powder according to claim 1 for being able to achieve 7075 aluminium alloy flawless SLM forming,
It is characterized in that, the ball-milling medium is stainless steel ball or sintered carbide ball.
6. the preparation method of the composite powder according to claim 1 for being able to achieve 7075 aluminium alloy flawless SLM forming,
It is characterized in that, the inert gas is argon gas or helium.
7. the preparation method of the composite powder according to claim 1 for being able to achieve 7075 aluminium alloy flawless SLM forming,
It is characterized in that, the revolving speed of the ball-milling treatment is 130-140r/min, and the time of ball-milling treatment is 3-5h, and the mass ratio of ball material is
4-6:1。
8. the preparation method of the composite powder according to claim 1 for being able to achieve 7075 aluminium alloy flawless SLM forming,
It is characterized in that, in the composite powder for being able to achieve 7075 aluminium alloy flawless SLM forming, the quality point of nano-ceramic particle
Number is 0.8wt%-1.0wt%, and the mass fraction of sub-micron hydride particle is 0.6wt%-1.4wt%, 7075 Al alloy powders
Mass fraction is 97.6wt%-98.6wt%.
9. one kind be able to achieve as made from the described in any item preparation methods of claim 1-8 7075 aluminium alloy flawless SLM at
The composite powder of shape, which is characterized in that partial size is 15-50 μm, oxygen content < 1000ppm.
10. the composite powder as claimed in claim 9 for being able to achieve 7075 aluminium alloy flawless SLM forming is in preparation SLM drip molding
In application.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110976845A (en) * | 2019-12-04 | 2020-04-10 | 华南理工大学 | Powder modification method for eliminating thermal cracks of 7075 aluminum alloy formed by laser 3D printing |
| CN111974986A (en) * | 2020-08-06 | 2020-11-24 | 东莞材料基因高等理工研究院 | Aluminum metal composite powder and laser additive prepared from same |
| CN114226736A (en) * | 2021-12-21 | 2022-03-25 | 北京航空航天大学 | Method for inhibiting crack formation and promoting grain refinement of additive manufacturing aluminum alloy |
| CN114309644A (en) * | 2021-10-28 | 2022-04-12 | 北京理工大学 | Method for eliminating thermal cracks of aluminum alloy parts |
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| CN114309644B (en) * | 2021-10-28 | 2022-12-06 | 北京理工大学 | Method for eliminating thermal cracks of aluminum alloy parts |
| CN114226736A (en) * | 2021-12-21 | 2022-03-25 | 北京航空航天大学 | Method for inhibiting crack formation and promoting grain refinement of additive manufacturing aluminum alloy |
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