CN106676365B - A kind of high-ductility is without constriction high-entropy alloy and preparation method thereof - Google Patents
A kind of high-ductility is without constriction high-entropy alloy and preparation method thereof Download PDFInfo
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- CN106676365B CN106676365B CN201611246702.3A CN201611246702A CN106676365B CN 106676365 B CN106676365 B CN 106676365B CN 201611246702 A CN201611246702 A CN 201611246702A CN 106676365 B CN106676365 B CN 106676365B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The present invention provides a kind of high-ductility without constriction high-entropy alloy, which is characterized in that the high-entropy alloy is made of Co, Fe, Ni, V and Mo element, and the general formula of the high-entropy alloy is CoaFebNicVdMoe, wherein a=0.5~2.5, b=0.5~2.5, c=1.8~2.5, d=0.2~1.0, e=0.2~1.2, the ratio are molar percentage.The high-entropy alloy shows excellent moulding and higher intensity in wide temperature range.The invention also discloses the preparation method of above-mentioned high-entropy alloy, step successively includes preparation, smelting and pouring before ingredient, melting.The high-entropy alloy shows excellent plasticity and higher intensity in wide temperature range, and the preparation method is easy to operate and safe and reliable, economical and practical.
Description
Technical field
The present invention relates to metal material and its preparation fields more particularly to a kind of high-ductility without constriction high-entropy alloy and its system
Preparation Method.
Background technique
High-entropy alloy is a kind of novel alloy developed rapidly in recent years, first high-entropy alloy paper [Yeh
J.W.,Chen S.K.,Lin S.J.,et al.,Nanostructured high entropy alloys with
multiple principal elements:novel alloy design concepts and outcomes[J]
.Advanced Engineering Materials, 2004,6 (5): 299-303.] in mention high-entropy alloy be by 5 kinds or more
Essential element is formed with equimolar ratio or nearly equimolar ratio.In general, the high hybrid entropy effect of high-entropy alloy can promote to be dissolved
The generation of body phase, however, experimentation have shown that, it often will appear intermetallic compound phase in the microscopic structure of high-entropy alloy, this is because
The system entropy of mixing is not the single factor for influencing alloy microscopic structure.Atomic size the difference δ, Guo et al. that Zhang Yong et al. is proposed
System valence electron the concentration VEC, Otto et al. of proposition propose enthalpy of mixing Δ HmixEtc. parameters can all influence the microstructure knot of system
Structure.
Since element species are various in high-entropy alloy, the atomic radius difference of every kind of element is larger, and constituent content is opposite
It is close, therefore, usually there is serious distortion of lattice in solid solution structure, solution strengthening effect is extremely violent, this is just significantly mentioned
The high intensity of alloy, hardness.And when there is intermetallic compound in the microscopic structure of high-entropy alloy, the strengthening mechanism of alloy
It is not only limited to solution strengthening, second-phase strength also will appear, and become the main reason for hardness improves.AlCoCrFeMo0.5
The hardness of cast form of high-entropy alloy can achieve 904HV, Al0.2Co1.5CrFeNi1.5The hardness of Ti high entropy alloy coating can achieve
1102HV, and 235 steel hardness of common Q only has 250HV or so.But higher for plasticity high-entropy alloy ingredient is also very scarce
It is weary.
Currently, the main study subject of high-entropy alloy is the small ingot of alloy of arc melting, due to the limitation of alloy size,
Tensile property is little affected by concern, and the missing for stretching data also seriously hinders the practical application of high-entropy alloy, makes high-entropy alloy
Experimental study state is rested on always.
Summary of the invention
According to technical problem set forth above, and a kind of high-ductility is provided without constriction high-entropy alloy and preparation method thereof.This
Invention is that the Atomic radiuses difference based on high-entropy alloy is theoretical, enthalpy of mixing is theoretical, VEC is theoretical and d orbital energy level is theoretical, from the period
Enthalpy of mixing is smaller, and atomic radius is closer to Co, Fe, Ni, V element are chosen in table forms CoFeNiV alloy.Then, by VEC
The molar fraction for being worth higher Ni element doubles, and the molar fraction of the lower V element of VEC value reduces half, further increases
Subtract the molar fraction of low-cost Fe element, while adjusting the molar fraction of the biggish Mo element of atomic radius, it is right to investigate its
The influence of alloy structure performance.
The atomicity ratio that the present invention designs is calculated as CoaFebNicVdMoeHigh-entropy alloy successively pass through it is quasi- before ingredient, melting
Standby, smelting and pouring preparation, to obtain showing excellent plasticity and higher-strength in wide temperature range, while can prepare large scale
High-entropy alloy ingot casting, it is safe and reliable, economical and practical.
The technological means that the present invention uses is as follows:
A kind of high-ductility is without constriction high-entropy alloy, which is characterized in that the high-entropy alloy is by Co, Fe, Ni, V and Mo element
Composition, the general formula of the high-entropy alloy are CoaFebNicVdMoe, wherein a=0.5~2.5, b=0.5~2.5, c=1.8~
2.5, d=0.2~1.0, e=0.2~1.2, the ratio are molar percentage.
Further, the high-entropy alloy shows excellent moulding and higher intensity in wide temperature range.
The present invention adds Fe element based on Co-Ni-V ternary alloy three-partalloy in ternary alloy three-partalloy, to reduce cost of alloy,
Mo element is added, to enhance the effect of solution strengthening effect in FCC solid solution, it is ensured that alloy is shown while with superior plasticity
Higher-strength is shown.
The invention also discloses a kind of preparation method of the above-mentioned high-ductility without constriction high-entropy alloy, it is characterised in that including such as
Lower step:
S1: before ingredient, the oxide skin that Mechanical Method removes every kind of raw metal surface can be used, and in ultrasonic instrument in ingredient
It is middle to be cleaned with alcohol；Alloy pig is prepared, the total weight of each alloy pig is 2kg~50kg, wherein Co, Fe, Ni, V, Mo
The purity of raw metal is above 99.5wt.%；The raw metal prepared is placed in inside the BN refractory burner hearth dried in advance,
By fusing point, high, volatile two kinds of raw metals of Mo, V are placed in crucible bottom, relatively low, good fluidity by other fusing points
Tri- kinds of raw metals of Co, Fe, Ni are placed in crucible top；
S2: preparing before melting, by the diluted ZrO of alcohol2Fireproof coating is equably brushed in graphite mold surface, and with
After 500 DEG C~600 DEG C drying 2h~3h, it is put into the corresponding position of running gate system, fastens fire door, is evacuated to 0.5 × 10-2Pa~
10-2Argon gas is recoiled after Pa to 0.06MPa；
S3: smelting and pouring, the operation voltage of fusion process are 550V~600V, after metal is completely melt 1500 DEG C~
It 1600 DEG C, pours into graphite jig and is cooled and shaped after keeping the temperature 10min~15min；Using infrared radiation thermometer to liquid metal
Thermometric, temperature measurement accuracy are ± 2 DEG C.
Further, in step s3, if desired to metal liquid solidification process apply electric current 30A~80A, frequency 10Hz~
The electromagnetic agitation of 50Hz, then turn on agitator power supply while molten metal pours into mould inside completely, and it is complete in molten metal
Power supply is closed after full solidification.
Further, the electromagnetic agitation is the electromagnetic induction by being passed through alternating current generation in the coil to mold exterior
What effect generated.Electromagnetic agitation is applied to metal liquid solidification process, it is therefore intended that refining alloy solidified structure improves inside alloy
Component segregation, field trash form and distribution, to optimize slab quality.
Compared with the prior art, Co of the present inventionaFebNicVdMoeHigh-entropy alloy and preparation method thereof has following excellent
Point:
1, the alloy mechanical property is excellent, and smelting obtained large volume technical grade ingot casting needs not move through any heat treatment work
Skill and deformation strengthening process, temperature-room type plasticity is excellent, and intensity is higher.Apply electromagnetic agitation in metal liquid solidification process, closes
The intensity and plasticity of gold improve simultaneously.
2, alloy strain field in loading process is uniformly distributed, and no necking phenomenon occurs.
3, preparation method provided by the invention can quickly and easily prepare high-entropy alloy large scale ingot casting, need not move through any
Heat treatment, crystal grain refinement, dense structure, the strength plastic's no-float of alloy.
The present invention can be widely popularized in metal material and its preparation field based on the above reasons.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to do simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is not apply and apply electromagnetic agitation CoFeNi2V0.5Mo0.2The XRD spectrum of ingot casting.
Fig. 2 is not apply electromagnetic agitation CoFeNi2V0.5Mo0.2The SEM photograph of ingot casting.
Fig. 3 is to apply electromagnetic agitation CoFeNi2V0.5Mo0.2The SEM photograph of ingot casting.
Fig. 4 is to apply and do not apply electromagnetic agitation CoFeNi2V0.5Mo0.2The room temperature tensile curve of ingot casting.
Fig. 5 is to apply electromagnetic agitation CoFeNi2V0.5Mo0.2The cryogenic tensile curve of ingot casting.
Fig. 6 is to apply electromagnetic agitation CoFeNi2V0.5Mo0.2The drawing by high temperature curve of ingot casting.
Fig. 7 is to apply electromagnetic agitation CoFeNi2V0.5Mo0.2The elongation strain field pattern of sample.
Fig. 8 is to apply electromagnetic agitation CoFeNi2V0.5Mo0.6The SEM photograph of ingot casting.
Fig. 9 is to apply electromagnetic agitation CoFeNi2V0.5Mo0.6The room temperature tensile curve of ingot casting.
Figure 10 is to apply electromagnetic agitation CoFeNi2VMo0.5The SEM photograph of ingot casting.
Figure 11 is to apply electromagnetic agitation CoFeNi2VMo0.5The room temperature tensile curve of ingot casting.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Vacuum medium frequency induction furnace used in following embodiment is that ZG-10 type improves vacuum medium frequency induction furnace.
The test method of institutional framework and mechanical property to gained high-entropy alloy is as follows:
(1) object material phase analysis: is carried out using the Empyrean type X-ray diffractometer of PANalytical company, Holland production
Facies analysis, the design parameter of experimentation are as follows: Cu target Kα1RayVoltage 30kV, electric current 20mA are operated,
0.22 °/s of scanning speed, 20 °~100 ° of scanning range.
(2) it microstructure: is carried out using the SUPRA55 type field emission electron flying-spot microscope of Zeiss company, Germany production
Analysis on Microstructure, operating voltage are 15kV.Secondary electron signal is used to observe the tissue topography of sample surfaces, backscattered electron
Signal is used to qualitatively analyze the Elemental redistribution of sample surfaces.
(3) room temperature tensile properties are tested: tensile tests at room is carried out on DNS100 type universal testing machine, test
Loading speed is 1 × 10-3s-1.The size of tensile sample is according to GB/T 228-2010 " metal material tensile test at room temperature " standard
Processing.
(4) cryogenic stretching performance is tested: cryogenic tensile device model is MTS 810, and in drawing process, sample is in always
Liquid nitrogen environment, rate of extension are 1 × 10-3s-1。
(5) high temperature tensile properties are tested: drawing by high temperature test is enterprising in 3500 high temperature hot modeling test machine of Gleeble
Capable, after sample surfaces reach target temperature and keep the temperature 5min, uniaxial tensile test is carried out to sample, loading speed is 1 × 10- 3s-1。
Embodiment 1
Present embodiment discloses a kind of high-ductility, without the high-entropy alloy of constriction, general formula are as follows: CoFeNi2V0.5Mo0.2,
In, a=1, b=1, c=2, d=0.5, e=0.2, the ratio are molar percentage.Alloy does not apply electricity in process of setting
Magnetic stirring.The purity of Co, Fe, Ni, V and Mo raw material is above 99.5wt.%.
The CoFeNi2V0.5Mo0.2High-entropy alloy the preparation method comprises the following steps:
S1: ingredient removes the oxide skin on every kind of raw metal surface with Mechanical Method before ingredient, and uses wine in ultrasonic instrument
Progress greatly row cleaning；The total weight of each alloy pig is 2.5kg, wherein Co 532.24g, Fe 504.37g, Ni 1060.08g, V
230.03g Mo 173.29g.The raw metal prepared is placed in inside the BN burner hearth dried in advance, fusing point is high, volatile
Mo, V metal be placed in crucible bottom, other fusing points are relatively low, preferable Co, Fe, Ni metal of mobility is placed on crucible
Portion.
S2: preparing before melting, by the diluted ZrO of alcohol2Coating is equably brushed in graphite mold surface, and with 500 DEG C
After~600 DEG C of drying 2h, it is put into the corresponding position of running gate system.Fire door is fastened, is evacuated to 0.5 × 10-2Pa~10-2After Pa
Argon gas recoil to 0.06MPa.
S3: smelting and pouring, the operation voltage of fusion process are 600V, aluminium alloy after metal induction furnace vacuum melting fusing
Holding temperature is set to 1550 DEG C, and it is cold that progress in the cylindrical graphite mold having a size of 70 × 180mm of Φ is poured into after warm 15min
But it forms.The thermometric process of liquid metal is completed by IRTM-2CK type infrared radiation thermometer, temperature measurement accuracy is ± 2 DEG C.
With wire cutting technology by resulting CoFeNi2V0.5Mo0.2High-entropy alloy is cut, and the size of metallographic sample is Φ
20 × 10mm stretches sample and processes according to GB/T 228-2010 " metal material tensile test at room temperature " standard.Before test, to gold
Phase sample ground, polished, corrosion treatment, is roughly ground to tensile sample.
To the CoFeNi2V0.5Mo0.2High-entropy alloy test specimens carry out material phase analysis, and X-ray diffraction (XRD) map is such as
Shown in Fig. 1, it is known that CoFeNi2V0.5Mo0.2Alloy is made of single-phase FCC solid solution.
To the CoFeNi2V0.5Mo0.2High-entropy alloy test specimens carry out Analysis on Microstructure, and scanning (SEM) photo is such as
Shown in Fig. 2, it is known that, ingot casting crystallite dimension is at 500 μm or so.
To the CoFeNi2V0.5Mo0.2High-entropy alloy sample carries out room temperature tensile properties test, tensile stress-strain
Curve is as shown in figure 4, it is found that CoFeNi2V0.5Mo0.2The elongation percentage of high-entropy alloy is 72.8%, tensile strength 528.1MPa.
Embodiment 2
Present embodiment discloses a kind of high-ductility, without the high-entropy alloy of constriction, general formula are as follows: CoFeNi2V0.5Mo0.2,
In, a=1, b=1, c=2, d=0.5, e=0.2, the ratio are molar percentage.Co, Fe, Ni, V and Mo raw material
Purity is above 99.5wt.%.
In casting process, is poured into completely in molten metal and open 50Hz friendship while outside is surrounded by the MgO mould inside of coil
Galvanic electricity source, the electromagnetic induction effect caused play the role of stirring metal bath, close power supply after molten metal solidifies completely.
The CoFeNi2V0.5Mo0.2High-entropy alloy the preparation method comprises the following steps:
S1: ingredient removes the oxide skin on every kind of raw metal surface with Mechanical Method before ingredient, and uses wine in ultrasonic instrument
Progress greatly row cleaning.The total weight of each alloy pig is 2.5kg, wherein Co 532.24g, Fe504.37g, Ni 1060.08g, V
230.03g Mo 173.29g.The raw material prepared are placed in inside the BN refractory burner hearth dried in advance, the high, Yi Hui by fusing point
Mo, V metal of hair are placed in crucible bottom, and by other fusing points, relatively low, good fluidity Co, Fe, Ni metal is placed on crucible
Portion.
S2: preparing before melting, by the diluted ZrO of alcohol2Fireproof coating is equably brushed in graphite mold surface, and with
After 500 DEG C~600 DEG C drying 2h~3h, it is put into the corresponding position of running gate system.Fire door is fastened, is evacuated to 0.5 × 10-2Pa~
10-2Argon gas is recoiled after Pa to 0.06MPa.
S3: smelting and pouring, the operation voltage of fusion process are 600V, aluminium alloy after metal induction furnace vacuum melting fusing
Holding temperature is set to 1550 DEG C, and it is cold that progress in the cylindrical graphite mold having a size of 70 × 180mm of Φ is poured into after warm 15min
But it forms.The thermometric process of liquid metal is completed by IRTM-2CK type infrared radiation thermometer, temperature measurement accuracy is ± 2 DEG C.It was poured
Cheng Zhong is poured into while outside is surrounded by the MgO mould inside of coil in molten metal and is opened 50Hz AC power source, completely in molten metal
Power supply is closed after solidification completely.
To the CoFeNi by electromagnetic agitation2V0.5Mo0.2High-entropy alloy test specimens carry out material phase analysis, XRD diagram
Spectrum is as shown in Figure 1, it is known that by the CoFeNi of electromagnetic agitation2V0.5Mo0.2Alloy is still made of single-phase FCC solid solution.
To the CoFeNi by electromagnetic agitation2V0.5Mo0.2High-entropy alloy test specimens carry out Analysis on Microstructure,
As shown in figure 3, it is found that after electromagnetic agitation, the crystallite dimension of ingot casting is reduced SEM photograph, about at 300 μm or so.
To the CoFeNi by electromagnetic agitation2V0.5Mo0.2High-entropy alloy test specimens carry out room temperature tensile properties test,
Its tensile stress-strain curve is as shown in figure 4, it is found that after electromagnetic agitation, CoFeNi2V0.5Mo0.2The extension of high-entropy alloy
Rate is 82.1%, tensile strength 547.0MPa.
To the CoFeNi by electromagnetic agitation2V0.5Mo0.2High-entropy alloy sample carries out cryogenic stretching performance test, answers
As shown in figure 5, it is found that when -196 DEG C of stretchings, yield strength, breaking strength and the elongation percentage of alloy are respectively force-strain curve
419.3MPa, 712.9MPa, 34.6%.When -70 DEG C of stretchings, yield strength, breaking strength and the elongation percentage of alloy are respectively
350.8MPa, 591.6MPa, 28.8%.It is obvious that the yield strength and breaking strength of alloy when deformation at room temperature compared with have
It is improved, and elongation percentage reduces, but still maintain high value.
To the CoFeNi by electromagnetic agitation2V0.5Mo0.2High-entropy alloy sample carries out high temperature tensile properties test, answers
As shown in fig. 6, it is found that when 600 DEG C of stretchings, yield strength, breaking strength and the elongation percentage of alloy are respectively force-strain curve
214.5MPa, 446.4MPa, 189.2%.When 700 DEG C of stretchings, yield strength, breaking strength and the elongation percentage of alloy are respectively
212.3MPa, 397.0MPa, 154.3%.When 800 DEG C of stretchings, yield strength, breaking strength and the elongation percentage of alloy are respectively
187.7MPa, 317.5MPa, 119.5%.
To the CoFeNi by electromagnetic agitation2V0.5Mo0.2High-entropy alloy sample carries out strain field distribution measurement experiment,
As a result as shown in fig. 7, the wavy distribution of strain field, this is just it is found that uniform deformation behaviour is presented in alloy in entire loading procedure
It effectively alleviates strain to concentrate, avoids the generation of constriction.
Embodiment 3
Present embodiment discloses a kind of high-ductility, without the high-entropy alloy of constriction, general formula are as follows: CoFeNi2V0.5Mo0.6,
In, a=1, b=1, c=2, d=0.5, e=0.6, the ratio are molar percentage.Co, Fe, Ni, V and Mo raw material
Purity is above 99.5wt.%.
The CoFeNi2V0.5Mo0.6High-entropy alloy the preparation method comprises the following steps:
S1: ingredient removes the oxide skin on every kind of raw metal surface with Mechanical Method before ingredient, and uses wine in ultrasonic instrument
Progress greatly row cleaning.The total weight of each alloy pig is 2.5kg, wherein Co 445.02g, Fe 421.72g, Ni 886.37g, V
384.67g Mo 362.23g.The raw material prepared are placed in inside the BN burner hearth dried in advance, fusing point is high, volatile
Mo, V metal are placed in crucible bottom, other fusing points are relatively low, preferable Co, Fe, Ni metal of mobility is placed in crucible top.
S2: preparing before melting, by the diluted ZrO of alcohol2Coating is equably brushed in graphite mold surface, and with 500 DEG C
After~600 DEG C of drying 2h, it is put into the corresponding position of running gate system.Fire door is fastened, is evacuated to 0.5 × 10-2Pa~10-2After Pa
Argon gas recoil to 0.06MPa.
S3: smelting and pouring, the operation voltage of fusion process are 600V, aluminium alloy after metal induction furnace vacuum melting fusing
Holding temperature is set to 1550 DEG C, and it is cold that progress in the cylindrical graphite mold having a size of 70 × 180mm of Φ is poured into after warm 15min
But it forms.The thermometric process of liquid metal is completed by IRTM-2CK type infrared radiation thermometer, temperature measurement accuracy is ± 2 DEG C.In metal
Liquid pours into external unlatching 50Hz AC power source while being surrounded by the MgO mould inside of coil completely, after molten metal solidifies completely
Close power supply.
With wire cutting technology by resulting CoFeNi2V0.5Mo0.6High-entropy alloy is cut, and the size of metallographic sample is Φ
20 × 10mm stretches sample and processes according to GB/T 228-2010 " metal material tensile test at room temperature " standard.Before test, to gold
Phase sample ground, polished, corrosion treatment, is roughly ground to tensile sample.
To the CoFeNi2V0.5Mo0.6The microstructure of high-entropy alloy is analyzed, and SEM photograph is as shown in figure 8, can
Know CoFeNi2V0.5Mo0.6In alloy other than containing solid solution phase, the second phase is had also appeared.
To the CoFeNi2V0.5Mo0.6High-entropy alloy test specimens carry out room temperature tensile properties test, and tensile stress-is answered
Varied curve is as shown in figure 9, it is found that CoFeNi2V0.5Mo0.6The elongation percentage of high-entropy alloy is 55.6%, and tensile strength is
664.3MPa。
Embodiment 4
Present embodiment discloses a kind of high-ductility, without the high-entropy alloy of constriction, general formula are as follows: CoFeNi2VMo0.5, wherein
A=1, b=1, c=2, d=1, e=0.5, the ratio are molar percentage.The purity of Co, Fe, Ni, V and Mo raw material
It is above 99.5wt.%.
The CoFeNi2VMo0.5High-entropy alloy the preparation method comprises the following steps:
S1: ingredient removes the oxide skin on every kind of raw metal surface with Mechanical Method before ingredient, and uses wine in ultrasonic instrument
Progress greatly row cleaning.The total weight of each alloy pig is 2.5kg, wherein Co 445.02g, Fe 421.72g, Ni 886.37g, V
384.67g Mo 362.23g.The raw material prepared are placed in inside the BN burner hearth dried in advance, fusing point is high, volatile
Mo, V metal are placed in crucible bottom, other fusing points are relatively low, preferable Co, Fe, Ni metal of mobility is placed in crucible top.
S2: preparing before melting, by the diluted ZrO of alcohol2Coating is equably brushed in graphite mold surface, and with 500 DEG C
After~600 DEG C of drying 2h, it is put into the corresponding position of running gate system.Fire door is fastened, is evacuated to 0.5 × 10-2Pa~10-2After Pa
Argon gas recoil to 0.06MPa.
S3: smelting and pouring, the operation voltage of fusion process are 600V, aluminium alloy after metal induction furnace vacuum melting fusing
Holding temperature is set to 1550 DEG C, and it is cold that progress in the cylindrical graphite mold having a size of 70 × 180mm of Φ is poured into after warm 15min
But it forms.The thermometric process of liquid metal is completed by IRTM-2CK type infrared radiation thermometer, temperature measurement accuracy is ± 2 DEG C.In metal
Liquid pours into external unlatching 50Hz AC power source while being surrounded by the MgO mould inside of coil completely, after molten metal solidifies completely
Close power supply.
With wire cutting technology by resulting CoFeNi2VMo0.5High-entropy alloy is cut, and the size of metallographic sample is Φ 20
× 10mm stretches sample and processes according to " metal material tensile test at room temperature " standard of GB/T 228-2010.Before test, to metallographic
Sample ground, polished, corrosion treatment, is roughly ground to tensile sample.
To the CoFeNi2VMo0.5The microstructure of high-entropy alloy is analyzed, and SEM photograph is as shown in Figure 10, it is known that
CoFeNi2VMo0.5Phase structure is presented in the microstructure of alloy.
To the CoFeNi2VMo0.5High-entropy alloy test specimens carry out room temperature tensile properties test, tensile stress-strain
Curve is as shown in figure 11, it is known that, CoFeNi2VMo0.5The elongation percentage of high-entropy alloy is 66.5%, tensile strength 504.3MPa.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (3)
1. a kind of high-ductility is without constriction high-entropy alloy, which is characterized in that the high-entropy alloy is by Co, Fe, Ni, V and Mo element group
At the general formula of the high-entropy alloy is CoaFebNicVdMoe, wherein a=0.5~2.5, b=0.5~2.5, c=1.8~2.5,
D=0.2~1.0, e=0.2~1.2, the ratio are molar ratio；
It prepares with the following method:
S1: ingredient removes the oxide skin on every kind of raw metal surface before ingredient, and is cleaned in ultrasonic instrument with alcohol；
Alloy pig is prepared, the total weight of each alloy pig is 2kg~50kg, wherein the purity of Co, Fe, Ni, V, Mo raw metal is high
In 99.5wt.%；The raw metal prepared is placed in inside the BN refractory burner hearth dried in advance, fusing point is high, volatile
Two kinds of raw metals of Mo, V are placed in crucible bottom, relatively low, good fluidity tri- kinds of metal originals of Co, Fe, Ni by other fusing points
Material is placed in crucible top；
S2: preparing before melting, by the diluted ZrO of alcohol2Fireproof coating is equably brushed in graphite mold surface, and with 500 DEG C~
After 600 DEG C of drying 2h~3h, it is put into the corresponding position of running gate system, fastens fire door, is evacuated to 0.5 × 10-2Pa~10-2Pa
Recoil argon gas is to 0.06MPa afterwards；
S3: the operation voltage of smelting and pouring, fusion process is 550V~600V, 1500 DEG C~1600 after metal is completely melt
DEG C, it pours into graphite jig and is cooled and shaped after heat preservation 10min~15min；Using infrared radiation thermometer to liquid metal temp.-measuring,
Temperature measurement accuracy is ± 2 DEG C.
2. high-ductility according to claim 1 is without constriction high-entropy alloy, which is characterized in that further include pair in step s3
Metal liquid solidification process applies the electromagnetic agitation of electric current 30A~80A, frequency 10Hz~50Hz, pours into mold completely in molten metal
Turn on agitator power supply while internal, and power supply is closed after molten metal solidifies completely.
3. high-ductility according to claim 2 is without constriction high-entropy alloy, which is characterized in that the electromagnetic agitation be pass through to
The electromagnetic induction effect generation of alternating current generation is passed through in the coil of mold exterior.
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