CN110230056A - Low melting point high-entropy alloy powder and its preparation method and application for magnesium lithium alloy laser surface modification - Google Patents
Low melting point high-entropy alloy powder and its preparation method and application for magnesium lithium alloy laser surface modification Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F9/00—Making metallic powder or suspensions thereof
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/04—Alloys containing less than 50% by weight of each constituent containing tin or lead
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C24/00—Coating starting from inorganic powder
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- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
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- B22F9/00—Making metallic powder or suspensions thereof
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Abstract
Low melting point high-entropy alloy powder and its preparation method and application for magnesium lithium alloy laser surface modification, the invention belongs to metal material technical field of modification, it in order to solve the preparation of existing magnesium lithium alloy surface strengthened coat and the hot object matching degree of magnesium lithium alloy it is poor, it is easy to cause the problem of magnesium lithium alloy occurs scaling loss, reduces coating performance in cladding process.Low melting point high-entropy alloy powder of the present invention for magnesium lithium alloy laser surface modification is made of by atomic percentage content 1%~35% Al, 1%~35% Sn, 1%~35% Cu, 1%~35% Mn, 1%~5% Mg, 0%~10% adjusting coating melting material and 0%~5% rare earth oxide.Application method: high entropy alloy coating is prepared on magnesium lithium alloy surface using laser melting coating.The present invention the low melting point high entropy alloy coating that magnesium lithium alloy surface deposits can be realized magnesium lithium alloy it is anti-corrosion, it is wear-resisting property significantly improve, effectively promotion service life.
Description
Technical field
The invention belongs to metal material technical field of modification, and in particular to a kind of eutectic for magnesium lithium alloy surface peening
Point high-entropy alloy powder and its preparation method and application.
Background technique
Since 21 century, China's Space Science and Technology rapid development, in the multinomial boat such as mars exploration, moon exploration program, manned space flight
Preeminent accomplishment is achieved in its engineering.However, the weight of spacecraft and all kinds of load is not with the continuous exploration to length and breadth of land space
It is disconnected soaring, dramatically increasing for launch cost is caused, the inexorable trend of space industry is designed and have become using lightweighting materials.
In addition, the lightweight transformation of the industries such as aviation, automobile, transport be also China " low-carbon life, Green Development " theory provide must
So require.
Magnesium lithium alloy as current most light one of structural material, have low-density, high specific strength, high specific stiffness material
Advantage, being recognized is one of optimal material in lightweight field.But magnesium lithium alloy hardness is low, wear-resisting, corrosion resisting property is poor, and
And its chemical property is active, easily aoxidizes, and leads to carry out it that surfacecti proteon difficulty is larger and protective coating quality is insufficient, seriously
It limits its scope of application and service life.
Laser melting and coating technique because of its clean energy, heat affected area is small, selection range is wide, coating layer thickness easy-regulating and and matrix
The advantages such as bond strength height and receive the extensive concern of people.Currently, existing part scientific research scholar uses laser melting and coating technique
Success is prepared for the complex intensifyings coatings such as Al base, Cu base, Ni base on magnesium/magnesium lithium alloy surface.But Cu base in existing coating system,
The coating materials such as Ni base and the hot object matching degree of magnesium lithium alloy are poor, pivot fusing point be higher than magnesium lithium alloy boiling point (about 1050~
1150 DEG C), cause magnesium lithium alloy in cladding process that scaling loss occurs, and then form stomata in the coating, and coating/basal body interface
The defects of locating contraction chamber, being mingled with is obvious, seriously reduces coating performance；Although Al base coating and the hot object matching degree of magnesium lithium alloy compared with
It is good, but its own strengthening effect is limited.Design takes into account the hot object matching degree of coating/matrix and excellent wear-resisting, excellent corrosion-proof performance
Coating material and exploitation laser melting coating matched with its and regulation of energy technique are still the laser surface intensified field of magnesium lithium alloy must
The big bottleneck problem that must be solved.
2004, high-entropy alloy (or multi-principal elements alloy) theory of the propositions such as TaiWan, China Tsinghua University professor Ye Junwei was
The design of the laser surface intensified coating of magnesium lithium alloy provides a new thinking.High-entropy alloy is generally main by 5 kinds or 5 kinds or more
Element is wanted to form, material designability is strong.And in high entropy effect, distortion of lattice effect, sluggish diffusion effect and " cocktail "
High-entropy alloy has the excellent comprehensive performances such as anti-corrosion, wear-resisting, heat-resisting under the action of effect.Therefore, (or mostly main based on high entropy
Member) alloy design concept, strengthened coat that is high with the hot physical property matter matching degree of magnesium lithium alloy and haveing excellent performance is developed in magnesium lithium alloy
Surface peening field has wide research and application prospect.
Summary of the invention
The purpose of the present invention is to solve the strengthened coats and the hot object of magnesium lithium alloy of the preparation of existing magnesium lithium alloy surface
It is poor with spending, it is easy to cause the problem of magnesium lithium alloy occurs scaling loss, reduces coating performance in cladding process, and provide one kind and be used for
The high entropy of the low melting point of magnesium lithium alloy laser surface modification (more pivots) alloy powder and its preparation and application, the high-entropy alloy of preparation
The matching of coating and magnesium lithium alloy matrix is good, and can realize matrix surface hardness, wear-resisting and corrosion resisting property be obviously improved.
The present invention presses atomic percentage content by 1% for the low melting point high-entropy alloy powder of magnesium lithium alloy laser surface modification
~35% Al, 1%~35% Sn, 1%~35% Cu, 1%~35% Mn, 1%~5% Mg, 0%~10%
Adjust the rare earth oxide composition of coating melting material and 0%~5%；Wherein the adjusting coating melting material be Zn, Ti,
V, one or more of Cr, Fe, Ni, Co, Ga, Ge, Y, Zr, Nb mixed metal.
Preparation method of the present invention for the low melting point high-entropy alloy powder of magnesium lithium alloy laser surface modification presses following step
It is rapid to realize:
One, by atomic percentage content weigh 1%~35% Al powder, 1%~35% Sn powder, 1%~35% Cu powder,
1%~35% Mn powder, 1%~5% Mg powder, 0%~10% rare earth oxygen for adjusting coating melting material and 0%~5%
Compound powder is as raw material；
Two, raw material is placed in atmosphere ball grinder, Ceramic Balls is added, argon gas are passed through, with the speed of 100~400 turns/min
Carry out ball milling, the metal powder after obtaining ball milling；
Three, the metal powder after step 2 ball milling is dried, is obtained for magnesium lithium alloy laser surface modification
Low melting point high-entropy alloy powder；
Wherein adjusting coating melting material described in step 1 is Zn, Ti, V, Cr, Fe, Ni, Co, Ga, Ge, Y, Zr, Nb
One or more of mixed metal.
The present invention applies the low melting point high-entropy alloy powder for magnesium lithium alloy laser surface modification to prepare high-entropy alloy painting
The method of layer is realized according to the following steps:
One, the surface of magnesium lithium alloy matrix is polished smooth using sand paper, it is then successively clear using dehydrated alcohol and acetone
Wash polishing after matrix, sandblasting roughening treatment be roughened after matrix；
Two, the low melting point high-entropy alloy powder for being used for magnesium lithium alloy laser surface modification is placed in the powder feeding of cold spray apparatus
It in device, is deposited the powder on the matrix surface after roughening by the high-speed flow of cold spraying, obtains the matrix for having initialization layer；
Three, laser melting coating is carried out to the matrix with initialization layer using laser, applied in cladding process in cladding region
Ultrasonic field and/or magnetic field are finally completed the preparation of magnesium lithium alloy surface laser cladding low melting point high entropy alloy coating.
Coating made from low melting point high-entropy alloy powder provided by the present invention for magnesium lithium alloy laser surface modification with
The hot object matching of magnesium lithium alloy is good, and interface binding power is high.Also, energy needed for preparation process is lower, and magnesium lithium alloy matrix is not sent out
The unfavorable transformations such as raw obvious scaling loss, deformation, magnesium elements floating is less, influences on coating performance smaller.
Constituent content of the present invention by regulation for the low melting point high-entropy alloy powder of magnesium lithium alloy laser surface modification,
High entropy effect, distortion of lattice effect, sluggish diffusion effect and " cocktail " effect of high-entropy alloy, high-entropy alloy can be given full play to
With the high entropy of mixing, cause its free energy low, stability is good, and in high-entropy alloy in all possible phases generated, multiple groups
The solid solution of member is that stability is best, this just makes multicomponent solid solution become the main phase in high-entropy alloy, and due to
Elements Atom it is of different sizes, there is also very big difference, these atoms need to account for when forming single lattice each side's surface properties
According to the lattice position of crystal, this just will necessarily result in the generation of distortion of lattice, and distortion of lattice can generate solution strengthening effect, energy
The intensity and hardness for making alloy are remarkably enhanced.High-entropy alloy is more readily formed single compared to conventional alloys simultaneously
Solid solution, single solid solution can reduce the effect of galvanic corrosion and the quantity of micro cell, to improve corrosion resistance.Also,
Cocktail effect (high-entropy alloy is generated by interaction is complemented each other between a variety of constituent element elements in alloy, according to
What is leaned on is these elements entirety, this effect being had an impact jointly to the performance of high-entropy alloy by multicomponent, due to itself and chicken
Reciprocation between tail wine each component is similar, is just referred to as " cocktail " effect) under the influence of, part is added in high-entropy alloy
Anti-corrosion element, such as Cu, Cr, Ni, Ti and Mo etc. can play the anti-corrosion advantage of these elements, and coating surface is made to generate passivating film,
Promote corrosive nature.
Detailed description of the invention
Fig. 1 is in embodiment 1 by the hardness distribution at the top of high entropy alloy coating to magnesium lithium alloy matrix；
Fig. 2 is the coefficient of friction comparison diagram of high entropy alloy coating and magnesium lithium alloy matrix in embodiment 1, and wherein solid line is height
Entropy alloy coat, dotted line are magnesium lithium alloy matrix；
Fig. 3 is the wear weight loss comparison diagram of high entropy alloy coating and magnesium lithium alloy matrix in embodiment 1；
Fig. 4 is the polarization curve of high entropy alloy coating and magnesium lithium alloy matrix in 3.5% sodium chloride solution in embodiment 1
Comparison diagram, wherein solid line is high entropy alloy coating, and dotted line is magnesium lithium alloy matrix；
Fig. 5 is in embodiment 2 by the hardness distribution at the top of high entropy alloy coating to magnesium lithium alloy matrix；
Fig. 6 is the coefficient of friction comparison diagram of high entropy alloy coating and magnesium lithium alloy matrix in embodiment 2, and wherein solid line is height
Entropy alloy coat, dotted line are magnesium lithium alloy matrix；
Fig. 7 is the wear weight loss comparison diagram of high entropy alloy coating and magnesium lithium alloy matrix in embodiment 2；
Fig. 8 is the polarization curve of high entropy alloy coating and magnesium lithium alloy matrix in 3.5% sodium chloride solution in embodiment 2
Comparison diagram, wherein solid line is high entropy alloy coating, and dotted line is magnesium lithium alloy matrix；
Fig. 9 is micro-organization chart at high entropy alloy coating after etching pit in embodiment 1 and magnesium lithium alloy basal body interface；
Figure 10 is micro-organization chart at high entropy alloy coating after etching pit in embodiment 2 and magnesium lithium alloy basal body interface.
Specific embodiment
Specific embodiment 1: present embodiment is used for the low melting point high-entropy alloy powder of magnesium lithium alloy laser surface modification
By atomic percentage content by 1%~35% Al, 1%~35% Sn, 1%~35% Cu, 1%~35% Mn, 1%~
5% Mg, 0%~10% adjusting coating melting material and 0%~5% rare earth oxide composition；The wherein adjusting
Coating melting material is one or more of Zn, Ti, V, Cr, Fe, Ni, Co, Ga, Ge, Y, Zr, Nb mixed metal.
The expression formula of low melting point high-entropy alloy powder of the present embodiment for magnesium lithium alloy laser surface modification be
AlaSnbCucMndMgeJfRg(atomic percent), wherein J be adjust Zn, Ti of coating material fusing point, V, Cr, Fe, Ni, Co,
One or more of Ga, Ge, Y, Zr, Nb, R are lower melting-point rare earth oxide.
Specific embodiment 2: the present embodiment is different from the first embodiment in that the rare earth oxide is
La2O3Or CeO2。
Specific embodiment 3: the present embodiment is different from the first embodiment in that being used for magnesium lithium alloy laser surface
Modified low melting point high-entropy alloy powder by atomic percentage content by 15%~30% Al, 15%~30% Sn, 15%~
30% Cu, 15%~30% Mn, 3%~5% Mg, 4%~8% adjust coating melting material and 1%~5% it is dilute
Native oxide composition.
Specific embodiment 4: present embodiment is used for the low melting point high-entropy alloy powder of magnesium lithium alloy laser surface modification
Preparation method implement according to the following steps:
One, by atomic percentage content weigh 1%~35% Al powder, 1%~35% Sn powder, 1%~35% Cu powder,
1%~35% Mn powder, 1%~5% Mg powder, 0%~10% rare earth oxygen for adjusting coating melting material and 0%~5%
Compound powder is as raw material；
Two, raw material is placed in atmosphere ball grinder, Ceramic Balls is added, argon gas are passed through, with the speed of 100~400 turns/min
Carry out ball milling, the metal powder after obtaining ball milling；
Three, the metal powder after step 2 ball milling is dried, is obtained for magnesium lithium alloy laser surface modification
Low melting point high-entropy alloy powder；
Wherein adjusting coating melting material described in step 1 is Zn, Ti, V, Cr, Fe, Ni, Co, Ga, Ge, Y, Zr, Nb
One or more of mixed metal.
Specific embodiment 5: present embodiment unlike specific embodiment four Al powder described in step 1,
Sn powder, Cu powder, Mn powder, Mg powder and adjust coating melting material powder diameter be 30 μm~100 μm；The rare earth oxide
The partial size of powder is 50nm~500nm.
Specific embodiment 6: present embodiment unlike specific embodiment four or five in step 2 according to 1:1
Ceramic Balls were added in the ball material mass ratio of~10:1, with speed ball milling 1~3 hour of 100~400 turns/min.
Specific embodiment 7: unlike one of present embodiment and specific embodiment four to six described in step 3
Drying process be 5~10 hours dry with 100~200 DEG C of temperature in a vacuum drying oven.
Specific embodiment 8: present embodiment applies the low melting point high-entropy alloy for magnesium lithium alloy laser surface modification
The method of powder preparation high entropy alloy coating is realized according to the following steps:
One, the surface of magnesium lithium alloy matrix is polished smooth using sand paper, it is then successively clear using dehydrated alcohol and acetone
Wash polishing after matrix, sandblasting roughening treatment be roughened after matrix；
Two, the low melting point high-entropy alloy powder for being used for magnesium lithium alloy laser surface modification is placed in the powder feeding of cold spray apparatus
It in device, is deposited the powder on the matrix surface after roughening by the high-speed flow of cold spraying, obtains the matrix for having initialization layer；
Three, laser melting coating is carried out to the matrix with initialization layer using laser, applied in cladding process in cladding region
Ultrasonic field and/or magnetic field are finally completed the preparation of magnesium lithium alloy surface laser cladding low melting point high entropy alloy coating.
Specific embodiment 9: present embodiment is roughened from sandblasting described in step 1 unlike specific embodiment eight
In treatment process control blasting pressure be 0.3~1.0Mpa, blast time be 10~40 seconds, sand blasting-used sand ball mesh number be 50~
200 mesh.
Specific embodiment 10: present embodiment step 2 cold spray process unlike specific embodiment eight or nine
In working gas be helium or nitrogen, control spray pressure be 2.5~4.5MPa, temperature be 300~500 DEG C, spray distance
For 20~30mm, spray angle is 70~90 °.
Specific embodiment 11: step 3 laser unlike one of present embodiment and specific embodiment eight to ten
600~1000W of laser power, 20~50mm/s of scanning speed, 3~4mm of spot diameter are controlled in cladding process.
Specific embodiment 12: present embodiment is unlike specific embodiment seven to one of 11 in cladding area
The ultrasonic amplitude of domain application ultrasonic field are as follows: 10~50 μm, 20~40Hz of frequency；Apply the magnetic induction intensity in magnetic field are as follows: 400~
1000mT。
Embodiment 1: preparation side of the present embodiment for the low melting point high-entropy alloy powder of magnesium lithium alloy laser surface modification
Method is implemented according to the following steps:
One, weigh the Al powder of 5.3963g, the Sn powder of 29.6775g, the Cu powder of 12.7092g, 10.9876g Mn powder,
The Fe powder of the Mg powder of 1.2152g, the Ni powder of 2.9347g and 2.7923g is as raw material；
Two, raw material is placed in atmosphere ball grinder, according to 3:1 ratio of grinding media to material be added Ceramic Balls, be passed through argon gas, with 300 turns/
The speed of min carries out ball milling 1 hour, the metal powder after obtaining ball milling；
Three, it is placed in drying 10 hours in 200 DEG C of vacuum oven to the metal powder after step 2 ball milling, is used for
The low melting point high-entropy alloy powder of magnesium lithium alloy laser surface modification.
The expression formula for the low melting point high-entropy alloy powder that the present embodiment is prepared is Al20Sn25Cu20Mn20Mg5Ni5Fe5
(atomic percent).
Application Example 1: the low melting point high-entropy alloy powder preparation high entropy alloy coating of the present embodiment Application Example 1
Method is realized according to the following steps:
One, the surface of magnesium lithium alloy matrix is polished smooth using sand paper, it is then successively clear using dehydrated alcohol and acetone
Matrix after washing polishing, sandblasting roughening treatment be roughened after matrix, the technological parameter of sandblasting roughening treatment is blasting pressure
For 0.5Mpa, blast time is 30 seconds, and sand blasting-used sand ball mesh number is 100 mesh；
Two, the low melting point high-entropy alloy powder for being used for magnesium lithium alloy laser surface modification is placed in the powder feeding of cold spray apparatus
It in device, is deposited the powder on the matrix surface after roughening by the high-speed flow of cold spraying, obtains the matrix for having initialization layer,
Cold spraying parameter are as follows: working gas is helium, and spray pressure 2.5MPa, temperature is 300 DEG C, spray distance 20mm, spraying
Angle is 90 °；
Three, laser melting coating is carried out to the matrix with initialization layer using laser, applied in cladding process in cladding region
Ultrasonic field and magnetic field are finally completed the preparation of magnesium lithium alloy surface laser cladding low melting point high entropy alloy coating, apply magnetic field
Magnetic induction intensity are as follows: 500mT；Apply the amplitude of ultrasonic wave are as follows: 20 μm, frequency 20Hz；The technological parameter of laser melting coating are as follows: laser
Power 800W, scanning speed 30mm/s, spot diameter 3mm.
By attached drawing 1 it is found that compared with magnesium lithium alloy, Al obtained20Sn25Cu20Mn20Mg5Ni5Fe5Low melting point high-entropy alloy
Coating hardness improves about 6 times.By attached drawing 2,3 it is found that in abrasion environment, the coating coefficient of friction and magnesium lithium of high-entropy alloy are closed
Gold is close, but wear weight loss is only the 1/7 of magnesium lithium alloy.It is high compared with magnesium lithium alloy by attached drawing 4 it is found that in a corrosive environment
The corrosion potential of entropy alloy coat is considerably higher, and corrosion current density may be significantly smaller.It demonstrates
Al20Sn25Cu20Mn20Mg5Ni5Fe5Low melting point high entropy alloy coating can be obviously improved magnesium lithium alloy matrix hardness, it is wear-resisting and
Corrosion resisting property.
As shown in Figure 9, the present embodiment high entropy alloy coating and magnesium lithium alloy matrix form good metallurgical bonding, interface
Obvious burning phenomenon does not occur for the defects of locating no stomata, crackle generation, matrix.
Embodiment 2: preparation side of the present embodiment for the low melting point high-entropy alloy powder of magnesium lithium alloy laser surface modification
Method is implemented according to the following steps:
One, weigh the Al powder of 6.4757g, the Sn powder of 28.4904g, the Cu powder of 15.251g, 13.1851g Mn powder,
The CeO of the Mg powder of 0.7292g, 1.7211g2Powder is as raw material；
Two, raw material is placed in atmosphere ball grinder, according to 5:1 ratio of grinding media to material be added Ceramic Balls, be passed through argon gas, with 300 turns/
The speed of min carries out ball milling 2 hours, the metal powder after obtaining ball milling；
Three, it is placed in drying 10 hours in 200 DEG C of vacuum oven to the metal powder after step 2 ball milling, is used for
The low melting point high-entropy alloy powder of magnesium lithium alloy laser surface modification.
The expression formula for the low melting point high-entropy alloy powder that the present embodiment is prepared is Al24Sn24Cu24Mn24Mg3(CeO2)1
(atomic percent).
Application Example 2: the low melting point high-entropy alloy powder preparation high entropy alloy coating of the present embodiment Application Example 2
Method is realized according to the following steps:
One, the surface of magnesium lithium alloy matrix is polished smooth using sand paper, it is then successively clear using dehydrated alcohol and acetone
Matrix after washing polishing, sandblasting roughening treatment be roughened after matrix, the technological parameter of sandblasting roughening treatment is blasting pressure
For 0.5Mpa, blast time is 30 seconds, and sand blasting-used sand ball mesh number is 100 mesh；
Two, the low melting point high-entropy alloy powder for being used for magnesium lithium alloy laser surface modification is placed in the powder feeding of cold spray apparatus
It in device, is deposited the powder on the matrix surface after roughening by the high-speed flow of cold spraying, obtains the matrix for having initialization layer,
Cold spraying parameter are as follows: working gas is helium, and spray pressure 2.5MPa, temperature is 350 DEG C, spray distance 30mm, spraying
Angle is 90 °；
Three, laser melting coating is carried out to the matrix with initialization layer using laser, applied in cladding process in cladding region
Ultrasonic field and magnetic field are finally completed the preparation of magnesium lithium alloy surface laser cladding low melting point high entropy alloy coating, apply magnetic field
Magnetic induction intensity are as follows: 500mT；Apply the amplitude of ultrasonic wave are as follows: 20 μm, frequency 20Hz；The technological parameter of laser melting coating are as follows: laser
Power 700W, scanning speed 30mm/s, spot diameter 3.5mm.
By attached drawing 5 it is found that compared with magnesium lithium alloy, Al obtained24Sn24Cu24Mn24Mg3(CeO2)1Low melting point high-entropy alloy
Coating hardness improves about 5.5 times.By attached drawing 6,7 it is found that in abrasion environment, the coating coefficient of friction and magnesium lithium of high-entropy alloy
Alloy is close, but wear weight loss is only the 1/4 of magnesium lithium alloy.By attached drawing 8 it is found that in a corrosive environment, compared with magnesium lithium alloy,
The corrosion potential of high entropy alloy coating is considerably higher, and corrosion current density may be significantly smaller.Demonstrate Al24Sn24Cu24Mn24Mg3
(CeO2)1Low melting point high entropy alloy coating can be obviously improved the hardness of magnesium lithium alloy matrix, wear-resisting and corrosion resisting property.
As shown in Figure 10, the present embodiment high entropy alloy coating and magnesium lithium alloy matrix form good metallurgical bonding, boundary
There is no the generation of the defects of stomata, crackle at face, obvious burning phenomenon does not occur for matrix.
Claims (10)
1. being used for the low melting point high-entropy alloy powder of magnesium lithium alloy laser surface modification, it is characterised in that this is used for magnesium lithium alloy and swashs
The modified low melting point high-entropy alloy powder of optical surface is by atomic percentage content by 1%~35% Al, 1%~35% Sn, 1%
~35% Cu, 1%~35% Mn, 1%~5% Mg, 0%~10% adjust coating melting material and 0%~5%
Rare earth oxide composition；Wherein the adjusting coating melting material is Zn, Ti, V, Cr, Fe, Ni, Co, Ga, Ge, Y, Zr, Nb
One or more of mixed metal.
2. the low melting point high-entropy alloy powder according to claim 1 for magnesium lithium alloy laser surface modification, feature
It is that the rare earth oxide is La2O3Or CeO2。
3. the low melting point high-entropy alloy powder according to claim 1 for magnesium lithium alloy laser surface modification, feature
It is the low melting point high-entropy alloy powder for magnesium lithium alloy laser surface modification by atomic percentage content by 15%~30%
Al, 15%~30% Sn, 15%~30% Cu, 15%~30% Mn, 3%~5% Mg, 4%~8% adjusting apply
Layer melting material and 1%~5% rare earth oxide composition.
4. the preparation method of the low melting point high-entropy alloy powder for magnesium lithium alloy laser surface modification, it is characterised in that this method
It realizes according to the following steps:
One, by atomic percentage content weigh 1%~35% Al powder, 1%~35% Sn powder, 1%~35% Cu powder, 1%
~35% Mn powder, 1%~5% Mg powder, 0%~10% rare earth oxide for adjusting coating melting material and 0%~5%
Powder is as raw material；
Two, raw material is placed in atmosphere ball grinder, Ceramic Balls is added, are passed through argon gas, carried out with the speed of 100~400 turns/min
Ball milling, the metal powder after obtaining ball milling；
Three, the metal powder after step 2 ball milling is dried, is obtained for the low of magnesium lithium alloy laser surface modification
Fusing point high-entropy alloy powder；
Wherein adjusting coating melting material described in step 1 is in Zn, Ti, V, Cr, Fe, Ni, Co, Ga, Ge, Y, Zr, Nb
One or more of mixed metals.
5. the preparation side of the low melting point high-entropy alloy powder according to claim 4 for magnesium lithium alloy laser surface modification
Method, it is characterised in that Al powder, Sn powder, Cu powder, Mn powder, Mg powder and the powder grain for adjusting coating melting material described in step 1
Diameter is 30 μm~100 μm；The partial size of the RE oxide powder is 50nm~500nm.
6. the preparation side of the low melting point high-entropy alloy powder according to claim 4 for magnesium lithium alloy laser surface modification
Method, it is characterised in that Ceramic Balls are added according to the ball material mass ratio of 1:1~10:1 in step 2, with the speed of 100~400 turns/min
Degree ball milling 1~3 hour.
7. method of the application for the low melting point high-entropy alloy powder preparation high entropy alloy coating of magnesium lithium alloy laser surface modification,
It is characterized in that the application method is realized according to the following steps:
One, the surface of magnesium lithium alloy matrix is polished smooth using sand paper, then successively cleans and beat using dehydrated alcohol and acetone
Matrix after mill, sandblasting roughening treatment be roughened after matrix；
Two, the low melting point high-entropy alloy powder for being used for magnesium lithium alloy laser surface modification is placed in the powder feeder of cold spray apparatus
In, it is deposited the powder on the matrix surface after roughening by the high-speed flow of cold spraying, obtains the matrix for having initialization layer；
Three, laser melting coating is carried out to the matrix with initialization layer using laser, applied in cladding process in cladding region ultrasonic
Field and/or magnetic field, are finally completed the preparation of magnesium lithium alloy surface laser cladding low melting point high entropy alloy coating.
8. prepared by low melting point high-entropy alloy powder of the application according to claim 7 for magnesium lithium alloy laser surface modification
The method of high entropy alloy coating, it is characterised in that it is 0.3 that blasting pressure is controlled during sandblasting roughening treatment described in step 1
~1.0Mpa, blast time are 10~40 seconds, and sand blasting-used sand ball mesh number is 50~200 mesh.
9. prepared by low melting point high-entropy alloy powder of the application according to claim 7 for magnesium lithium alloy laser surface modification
The method of high entropy alloy coating, it is characterised in that the working gas in step 2 cold spray process is helium or nitrogen, control spray
Painting pressure is 2.5~4.5MPa, and temperature is 300~500 DEG C, and spray distance is 20~30mm, and spray angle is 70~90 °.
10. the low melting point high-entropy alloy powder system that application according to claim 7 is used for magnesium lithium alloy laser surface modification
The method of standby high entropy alloy coating, it is characterised in that control 600~1000W of laser power in step 3 laser cladding process, sweep
Retouch 20~50mm/s of speed, 3~4mm of spot diameter.
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