CN104313572B - A kind of preparation method of aluminum alloy surface laser alloying Al Cr Ti Si Cu multi-principal elements alloy coatings - Google Patents
A kind of preparation method of aluminum alloy surface laser alloying Al Cr Ti Si Cu multi-principal elements alloy coatings Download PDFInfo
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- CN104313572B CN104313572B CN201410644577.6A CN201410644577A CN104313572B CN 104313572 B CN104313572 B CN 104313572B CN 201410644577 A CN201410644577 A CN 201410644577A CN 104313572 B CN104313572 B CN 104313572B
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 45
- 238000000576 coating method Methods 0.000 title claims abstract description 39
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 19
- 239000000956 alloy Substances 0.000 title claims abstract description 19
- 238000005275 alloying Methods 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 28
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 20
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 14
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 12
- 229940068984 polyvinyl alcohol Drugs 0.000 claims abstract description 12
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 229910004340 Ti-Si-Cu Inorganic materials 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 239000008236 heating water Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 230000004224 protection Effects 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 3
- 230000002153 concerted effect Effects 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 239000004411 aluminium Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010894 electron beam technology Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000013475 authorization Methods 0.000 description 3
- 239000007767 bonding agent Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910021332 silicide Inorganic materials 0.000 description 2
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910018594 Si-Cu Inorganic materials 0.000 description 1
- 229910008465 Si—Cu Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- 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
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a kind of preparation method of aluminum alloy surface laser alloying Al Cr Ti Si Cu multi-principal elements alloy coatings, comprise the following steps：1）Cr, Ti, Si, Cu and Al powder are weighed respectively；2）By 1）In weighed powder mixing；3）Configuration concentration is 4% poly-vinyl alcohol solution；4）Aluminium alloy plate surface is ground off, and cleaned；5）By 2）The powder mixed uses 3）Configuration solution reconcile into it is thick, by its precoating through 4）On aluminium alloy plate after processing；6）Prefabricated coating on aluminium alloy plate is irradiated.The present invention can make hardness high, wearability and good in oxidation resistance, metallurgical junction in aluminum alloy surface and make a concerted effort strong coating.
Description
Technical field
The present invention relates to material surface processing and reinforcement technique field, more particularly to a kind of aluminum alloy surface laser alloying
The preparation method of Al-Cr-Ti-Si-Cu multi-principal elements alloy coatings；High rigidity, height are formed on the surface of aluminium alloy by this method
The alloying layer of wearability and highly corrosion resistant.
Background technology
Aluminium and aluminium alloy are one of most widely used materials in non-ferrous metal, and aluminium alloy has small density, easy processing, heat
Many excellent properties such as the coefficient of expansion is low, thermal conductivity is high, specific stiffness and specific strength height.Daily production and life and aviation,
The fields such as automobile, high ferro, engine piston, optical instrument, guided missile mosaic texture achieve extensive use.But with industrial production
Further development, higher requirement is proposed to the surface property of aluminium alloy, wearability, corrosion resistance and inoxidizability seem
It is particularly important.
At present, the method for preparing wear-resistant coating in aluminum alloy surface is typically to spray one layer of cohesive bottom in aluminum alloy surface
Layer, then oxide ceramics working lining is sprayed, the composite coatings such as Ni/Al-Al2O3, NiCrAl-Al2O3, Ni-Al2O3 are prepared,
But the anchoring strength of coating that this method is prepared is low, and surface easily forms oxide-film.Such as Li Fuquan（Authorize public
Announcement number：CN 100549233C）Aluminum or aluminum alloy surface is strengthened by the molten note ceramic particle of electric arc auxiliary laser.Guo Zhi is waited suddenly
" a kind of method that aluminum alloy surface applies wear-resistant coating "（Authorization Notice No.：CN 100408724C）In by reaction raw materials
It is middle to add excessive aluminium, melt the oxide-film of the aluminium surface on surface using self-propagating reaction liberated heat, in centrifugal force
Oxide is separated under effect.The inner surface that this method is only suitable for tubing component obtains wear-resistant coating, and leading because of aluminium alloy
Heat effect, it is difficult to make intermetallic Fe-Al compound and aluminum substrate good combination.
High-current pulsed electron beam (HCPEB) is a kind of new and effective process for treating surface developed in recent years, is
To accelerate electronics as the novel high-energy density charged particle line of energy carrier.High-current pulsed electron beam is easy to than pulsed ionizing beam
Draw and control, device is simple and reliable.Energy during high-current pulsed electron beam irradiation metal material in the absence of pulse laser beam is anti-
Problem is penetrated, S. E. A. is influenceed small by material composition and configuration of surface.High-current pulsed electron beam ratio is in vacuum environment
Complete, the problems such as can effectively suppressing high-temperature oxydation and the pollution of material.Such as " the processing side of ultrahigh-strength aluminum alloy surface alloying
Method "（Authorization Notice No.：CN 102691040A）, but the surface reforming layer that E.B surface treatment is obtained is too thin, for work
Enough protections can not be played on the aluminum alloy part surface of severe friction environment.
Sun Ronglu etc.（Authorization Notice No.：CN 100491593C）A kind of high-energy-density laser remolten surface cladding is invented
The aluminum alloy surface strengthening method of SiC/Al-Si powder, obtains good surface quality, high abrasion and height hard on alloy matrix aluminum
The strengthened coat of degree.But the wearability of aluminium alloy is improved using ceramic powders, it is impossible to inherently solve high-melting-point ceramics
The problem of combination interface crackle and cracking that layer is brought.
The content of the invention
For deficiencies of the prior art, it is an object of the invention to provide a kind of aluminum alloy surface laser alloy
Change the preparation method of Al-Cr-Ti-Si-Cu multi-principal elements alloy coatings, face coat has high hardness, wearability and inoxidizability
The advantages of good, metallurgical junction makes a concerted effort strong.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is such：A kind of aluminum alloy surface laser
The preparation method of alloying Al-Cr-Ti-Si-Cu multi-principal elements alloy coatings, it is characterised in that：Comprise the following steps：
1）Cr, Ti, Si, Cu and Al powder are weighed respectively, wherein, Cr, Ti, Si, Cu and Al molar percentage are：Cr：
20-30%, Ti：20-30%, Si：20-30%, Cu：20-30%, Al：0—5%；
2）By 1）In the powder that has weighed be put into ball mill and mix 2-5 hours；
3）Configuration concentration is 4% poly-vinyl alcohol solution, and heating water bath makes its polyvinyl alcohol dissolve completely；
4）The oxide-film on aluminium alloy plate surface is polished off with abrasive paper for metallograph, and cleaned up with acetone；
5）By 2）The powder mixed uses 3）The poly-vinyl alcohol solution of configuration reconcile into it is thick, by its precoating through 4）
Prefabricated coating is formed on aluminium alloy plate after processing, the prefabricated coating layer thickness is 0.3-0.6mm, is then dried 2-5 hours；
6）The prefabricated coating on aluminium alloy plate is irradiated with laser, and using high-purity argon gas protection.
Further, step 6）In, the defocusing amount of laser focal spot is 3-5mm, and pulse width is 5-10ms, laser peak work(
Rate is 6-8kw, and frequency 5-13HZ, sweep speed is 2-6mm/s.
Further, it is UW-600A type YAG lasers that the laser, which is used,.
Further, step 1）In, weighing for various powder is carried out using electronic balance FA2004N.
Compared with prior art, the invention has the advantages that：
1. the good Al-Cr-Ti- of one layer of hardness height, wearability can be formed on the surface of aluminum alloy base material by this method
Si-Cu alloying layers, and alloying layer has good adhesion with aluminum alloy base material, oxidation resistance is stronger.
2. aluminum alloy surface intensity can be effectively improved, aluminum alloy surface wearability and corrosion resistance are improved.
Brief description of the drawings
Fig. 1 is the schematic diagram for the coating that embodiment 1 is obtained.
Fig. 2 is the X ray diffracting spectrum that embodiment 1 obtains coating.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
A kind of preparation method of aluminum alloy surface laser alloying Al-Cr-Ti-Si-Cu multi-principal elements alloy coatings, including such as
Lower step：
1）Cr, Ti, Si, Cu and Al powder are weighed respectively, wherein, Cr, Ti, Si, Cu and Al molar percentage are：Cr：
20-30%, Ti：20-30%, Si：20-30%, Cu：20-30%, Al：0—5%；During weighing, using electronic balance
FA2004N carries out weighing for various powder, and accuracy is high, and it is more accurate to weigh.
2）By 1）In the powder that has weighed be put into ball mill and mix 2-5 hours.
3）Configuration concentration is 4% poly-vinyl alcohol solution, and heating water bath makes polyvinyl alcohol dissolve completely.
4）The oxide-film on aluminium alloy plate surface is polished off with abrasive paper for metallograph, and cleaned up with acetone.
5）By 2）The powder mixed uses 3）The poly-vinyl alcohol solution of configuration reconcile into it is thick, by its precoating through 4）
Prefabricated coating is formed on aluminium alloy plate after processing, the prefabricated coating layer thickness is 0.3-0.6mm, is then dried 2-5 hours.
6）The prefabricated coating on aluminium alloy plate is irradiated with laser, and using high-purity argon gas protection；During operation, from
Lateral blowing argon gas, to prevent oxidation.Because aluminium alloy is high to YAG laser absorption rates；Therefore, the laser uses UW-600A
Type YAG laser, specific process parameter is：The defocusing amount of laser focal spot is 3-5mm, and pulse width is 5-10ms, laser peak
Power is 6-8kw, and frequency 5-13HZ, sweep speed is 2-6mm/s.
High-entropy alloy is formed than preparation by equimolar ratio or nearly equimolar by 5 kinds or more than 5 kinds alloying elements, is led more
First high-entropy alloy is by its distinctive high entropic effect, slow diffusion effect, and nanometer is mutually strengthened and the features such as superelevation distortion of lattice, has
Beneficial to the high tenacity for keeping alloy, it is possible to assign a variety of superiority such as the high hardness of material, high temperature resistant, wear-resistant, corrosion-resistant
Energy.The present invention is matched using Cr, Ti, Si, Cu and Al, is made coating material, in the case where ensureing that it reaches demand, more
Save material cost well；And thermophysical property difference is smaller between the coating material and alloy matrix aluminum material, thus can
It is directly used in laser melting coating and obtains the uniform coating of composition, it is possible to achieve is applied in inexpensive metal material surface and be covered with high-performance
High-entropy alloy coating, this will have a good application prospect.
Specific embodiment is as follows：
Embodiment 1：Referring to Fig. 1, Fig. 2, Cr, Ti, Si, Cu and Al powder, mol ratio are weighed with electronic balance FA2004N
For：26% Cr, 28% Ti, 19% Si, 26% Cu, 1% Al, and the powder weighed up will be placed in ball mill fully
Well mixed, incorporation time is 4 hours.4% polyvinyl alcohol is reconfigured at as bonding agent, by its heating water bath 10 minutes or so,
It is set to dissolve completely.Aluminium sheet is polished off to the oxide-film on surface with abrasive paper for metallograph, and cleaned up with acetone.By mixed powder
Reconciled into the bonding agent prepared thick, by its precoating on cleaned aluminium sheet, coating thickness is 0.5mm, dry 3
Hour or so.Use UW-600A types YAG laser to irradiate the prefabricated coating on aluminium alloy, using high-purity argon gas
Protection.The defocusing amount of laser focal spot is 3mm, and pulse width is 6ms, and laser peak power is 8kw, frequency 8HZ, and sweep speed is
5mm/s.Coating will be obtained to be cut with wire cutting, X-ray diffraction is done, diffracting spectrum as shown in Figure 2, Momentum profiles analysis is obtained
Understand that the main alloy of coating is mutually M5Si3 types silicide and BCC phases with calculation of thermodynamics；The average hardness of coating is HV653；
Illustrate that the performance on surface is improved.
Embodiment 2：Cr, Ti, Si, Cu and Al powder are weighed with electronic balance FA2004N, mol ratio is：22% Cr,
24% Ti, 24% Si, 27% CU, 3% Al, and the powder weighed up will be placed in ball mill and be sufficiently mixed uniform, mixing
Time is 3 hours.4% polyvinyl alcohol is reconfigured at as bonding agent, by its heating water bath 10 minutes or so, it is dissolved completely.
Aluminium sheet is polished off to the oxide-film on surface with abrasive paper for metallograph, and cleaned up with acetone.By the mixed powder bonding prepared
Agent reconciles into thick, and by its precoating on cleaned aluminium sheet, coating thickness is 0.5mm, dries 3 hours or so.Adopt
It is that UW-600A types YAG laser is irradiated to the prefabricated coating on aluminium alloy, is protected using high-purity argon gas.Laser is burnt
The defocusing amount of spot is 3mm, and pulse width is 6ms, and laser peak power is 8kw, and frequency 8HZ, sweep speed is 5mm/s, with reference to
Energy spectrum analysis understands that the main alloy of coating is mutually M5Si3 types silicide and BCC phases with calculation of thermodynamics；The average hardness of coating
For HV686；Illustrate that the performance on surface is improved.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than restriction technologies side
Case, it will be understood by those within the art that, those modify or equivalent substitution to technical scheme, and
The objective and scope of the technical program are not departed from, all should be covered among scope of the presently claimed invention.
Claims (3)
1. a kind of preparation method of aluminum alloy surface laser alloying Al-Cr-Ti-Si-Cu multi-principal elements alloy coatings, its feature exists
In：Comprise the following steps：
1）Cr, Ti, Si, Cu and Al powder are weighed respectively, wherein, Cr, Ti, Si, Cu and Al molar percentage are：Cr：20—
30%, Ti：20-30%, Si：20-30%, Cu：20-30%, Al：0—5%；
2）By 1）In the powder that has weighed be put into ball mill and mix 2-5 hours；
3）Configuration concentration is 4% poly-vinyl alcohol solution, and heating water bath makes its polyvinyl alcohol dissolve completely；
4）The oxide-film on aluminium alloy plate surface is polished off with abrasive paper for metallograph, and cleaned up with acetone；
5）By 2）The powder mixed uses 3）The poly-vinyl alcohol solution of configuration reconcile into it is thick, by its precoating through 4）Processing
Prefabricated coating is formed on aluminium alloy plate afterwards, the prefabricated coating layer thickness is 0.3-0.6mm, is then dried 2-5 hours；
6）The prefabricated coating on aluminium alloy plate is irradiated with laser, and using high-purity argon gas protection, wherein, laser focal spot
Defocusing amount be 3-5mm, pulse width is 5-10ms, and laser peak power is 6-8kW, frequency 5-13Hz, and sweep speed is
2-6mm/s。
2. a kind of aluminum alloy surface laser alloying Al-Cr-Ti-Si-Cu multi-principal elements alloy coatings according to claim 1
Preparation method, it is characterised in that：It is UW-600A type YAG lasers that the laser, which is used,.
3. a kind of aluminum alloy surface laser alloying Al-Cr-Ti-Si-Cu multi-principal elements alloy coatings according to claim 1
Preparation method, it is characterised in that：Step 1）In, weighing for various powder is carried out using electronic balance FA2004N.
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| CN104805450B (en) * | 2015-03-20 | 2017-03-08 | 南京航空航天大学 | Three-phase aluminum titanium copper micron particle reinforced aluminum alloy protective coating and preparation method |
| CN104785602A (en) * | 2015-04-10 | 2015-07-22 | 广东龙丰精密铜管有限公司 | Machining mold with high-hardness working face |
| CN105401114B (en) * | 2015-11-18 | 2017-11-14 | 郑郧 | A kind of method that titanium alloy surface prepares multi-principal elements alloy coating |
| EP3427873B1 (en) | 2016-03-11 | 2023-09-20 | Mitsubishi Materials Corporation | Surface-coated cutting tool with excellent chip resistance and abrasion resistance |
| CN105862035A (en) * | 2016-06-25 | 2016-08-17 | 芜湖三刀材料科技有限公司 | High-entropy alloy coating and preparation method thereof |
| CN109536953B (en) * | 2018-12-29 | 2021-02-12 | 安徽鑫铂铝业股份有限公司 | High-strength large-scale vehicle aluminum profile |
| CN110344045A (en) * | 2019-08-27 | 2019-10-18 | 兰州理工大学 | A kind of preparation method of fabricated in situ low pressure cold spraying CuAlNiCrTiSi high entropy alloy coating |
| CN111235561A (en) * | 2019-12-23 | 2020-06-05 | 江苏大学 | Preparation method of high-performance Pb/Al coating |
| CN114032437B (en) * | 2021-11-15 | 2022-09-23 | 海南大学 | Novel Fe-Cr-Co-Cu-Ti-Y multi-element high-entropy alloy coating and preparation method thereof |
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