CN107881443A - A kind of high-entropy alloy squeezes pier composite modification technology - Google Patents
A kind of high-entropy alloy squeezes pier composite modification technology Download PDFInfo
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- CN107881443A CN107881443A CN201711143614.5A CN201711143614A CN107881443A CN 107881443 A CN107881443 A CN 107881443A CN 201711143614 A CN201711143614 A CN 201711143614A CN 107881443 A CN107881443 A CN 107881443A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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Abstract
The method that the high-performance high entropy alloy material of even tissue is prepared the present invention relates to the plastics modification technology of a kind of hot-working specifically for high entropy alloy material and crystal grain refinement.The purpose of the present invention essentially consists in：A kind of crowded pier compound plastic method of modifying for high-entropy alloy service demand is provided.For the hot-working feature of high-entropy alloy, squeezed again using first pier, pier is again squeezed, the crowded method of pier repeatedly, the stress state in deformation process inside high entropy alloy material is effectively controlled, improves three-dimensional compression stress, effectively suppress the germinating and extension for the micro-crack that distortion of lattice induces, crystal grain thinning, comprehensive mechanical property is improved, realizes effective modification of high-entropy alloy.Pier combination process is squeezed to be easily achieved, cost is cheap, can obtain the uniform excellent high-entropy alloy ingot blank material of structure property, effectively improve its service ability, the high-volume that can not only promote high-entropy alloy using this method uses, but also can be effectively improved and control the mechanical property of high-entropy alloy.
Description
Technical field
The present invention relates to a kind of specifically for high entropy alloy material hot-working and the plastics modification method of crystal grain refinement.
Background technology
High-entropy alloy is concerned brand-new material wide in recent years, has high rigidity, high intensity, high-wearing feature and high corrosion resistant
The good mechanics such as corrosion, physics and chemical property, have a wide range of applications in modern project field.But because high entropy closes
Golden distortion of lattice is serious, and as-cast structure is typical pine-tree structure, and plasticity is relatively low under the conditions of high temperature deformation, simultaneously because casting
The presence of defect, easy to crack after high temperature forging, its excellent mechanical property can not be not fully exerted in engineer applied,
It significantly limit the large-scale engineering applications of high-entropy alloy.In order to eliminate casting flaw, high-entropy alloy generally use is forged
It is modified.
High temperature forging is important materials processing technology, can close micro-crack, smash dendrite, be effectively improved material
Structure property, it is the important modification method of metal material.But high-entropy alloy is easily formed because distortion of lattice is serious in forging process
Crackle, greatly hinder the application of plastic working forging modified technique.
Jumping-up processing is forge piece blank reheating is highly reduced in forging processing, the forming technology of cross-sectional area increase.During jumping-up,
Friction is contacted due to existing above and below material between two end faces and forging equipment chopping block, causes material imperfect flow, can cause
The temperature of material different zones, stressing conditions, deformation extent, structural transformation etc. are uneven, and for high-entropy alloy jumping-up,
Due to above mentioned problem and the collective effect of distortion of lattice problem, Chang Yi produces longitudinal direction or the crackle in 45 ° of directions in side surface.
Extruding, it is that the metal stock being opposite in mould cavity (or recipient) applies external force, forces metal from nib
Extrusion, the plastic processing method of end surface shape, size and the extruding product with certain mechanical property, its stress shape needed for acquisition
State is typical three-dimensional compressive stress, can be with effectively closed micro-crack.
In consideration of it, the present invention proposes a kind of simple Technology of Plastic Processing easily realized, that is, pier composite modification technology is squeezed, squeezes pier
The compound stress state that can improve material internal, three-dimensional compressive stress is improved, reduce tensile stress level to improve formability of materials
The forging method of energy, there is important function and significance for improving high-entropy alloy plastic deformation ability.By to high-entropy alloy
Ingot blank, which applies, fully repeatedly squeezes pier Compound Machining, effectively controls ingot blank internal stress distribution in plastic processing, formation is directed to
The gradient three-dimensional compression stress of deformation process feature, effectively suppress the germinating and extension of micro-crack in high-entropy alloy deformation process,
Crystal grain thinning, effective control that becomes more meticulous to high-entropy alloy microstructure is completed, realizes efficient plastics modification, this process can be
Realized on the process equipment such as conventional extruded cylinder and forging hammer, simple and easy, easy popularization and application.
The content of the invention
It is an object of the invention to：A kind of crowded pier compound plastic method of modifying for high-entropy alloy service demand is provided.
For the hot-working feature of high-entropy alloy, squeezed again using first pier, squeezed pier again, repeatedly the crowded method of pier, effectively control deformed
Stress state in journey inside high entropy alloy material, three-dimensional compression stress is improved, effectively suppresses the micro-crack that distortion of lattice induces
Germinating and extension, crystal grain thinning, improve comprehensive mechanical property, realize effective modification of high-entropy alloy.
Squeeze pier combination process to be easily achieved, cost is cheap, can obtain the uniform excellent high-entropy alloy ingot blank of structure property
Material, its service ability is effectively improved, the high-volume that can not only promote high-entropy alloy using this method uses, but also can have
Effect improves and the mechanical property of control high-entropy alloy.
In order to solve the above technical problems, the crowded pier composite modifying method of the present invention is realized using following technical scheme：
The first step：The making of high-entropy alloy original blank.According to ingot blank measure high-entropy alloy bar, then by basis
The difference of the morphological element of high-entropy alloy, 900 DEG C -1200 DEG C of initial temperature is heated to, according to bar thickness 0.8-1min/mm
Isothermal holding is carried out, 12-100h is incubated, promotes its interior tissue uniform.
Second step：High-entropy alloy bar upsetting process is analyzed and jumping-up processing.With reference to selected high-entropy alloy composition with
And deformation characteristicses, by software calculate and analog simulation, obtain mushrooming deformation during ingot blank different parts stress characteristics with
The regularity of distribution and damage profile of rule, especially three-dimensional compression stress.On this basis, bond material stress and damage are special
Sign, deformation and three-dimensional compression stress of the analysis high-entropy alloy under the conditions of difference is upset change with damage profile, most closed
Suitable upset ratio of height to diameter, and then optimize upset scheme, avoid upset generation cydariform crackle.On this basis, the upsetting of optimization is relied on
Thick scheme, jumping-up processing is carried out to the high-entropy alloy ingot blank of first step homogenization, upper and lower chopping block uses flat anvil plate, and chopping block is pre-
Hot to 500 degree, strain rate 0.01s-1-0.1s-1, preferred 0.05s-1。
3rd step：High-entropy alloy extrusion process is analyzed and extrusion process.After the completion of upset, to strained high-entropy alloy embryo
Material carries out high temperature extrusion.By software calculating and analog simulation, the material flow performance of high-entropy alloy in extrusion process is analyzed, is obtained
The extrusion technology program that must optimize.On this basis, binding analysis result, carry out high-entropy alloy extrusion process, it is straight to reduce blank
Footpath, increase length of material.Extrusion temperature 900-1100 degree, extrusion ratio are less than 2.
4th step：Circulate upset.High-entropy alloy bar after the completion of extruding is placed into heating furnace heating, insulation.When up to
To after deformation temperature, high-entropy alloy is taken out into progress, and high temperature is upset processing modified again.900 DEG C -1200 DEG C of deformation temperature, preferably
1100 DEG C, strain rate 0.01s-1-0.1s-1, preferred 0.05s-1。
5th step：Cycle extrusion.To carrying out extrusion process again, extrusion temperature by the high-entropy alloy blank of jumping-up again
900-1100 degree, extrusion ratio are less than 2.
Continue the 4th step and the 5th step flow repeatedly, the circulation of jumping-up extrusion cladding, until acquisition crystal grain fine tissue is uniform,
High-entropy alloy ingot blank with excellent service ability, process high-entropy alloy structure property and meet service demand.
Compared with prior art, beneficial effects of the present invention are as follows：
High-entropy alloy is made up of multielement constituent element, and its as-cast structure is more based on thick dendrite, this institutional framework meeting
The combination property of serious influence high-entropy alloy.Dendrite, crystal grain thinning can be crushed by plastic working, but because high entropy closes
The presence of thick atom radius constituent element, causes it serious distortion of lattice to be present, easily causes out in plastic history in gold
Split, the formation of crackle can have a strong impact on the application of material.Compression stress can be effectively improved by squeezing pier Compound Machining, control becomes
Stress state during shape inside high entropy alloy material, three-dimensional compression stress is improved, complete to press down while broken large dendritic crystal
The germinating and extension for the micro-crack that distortion of lattice processed induces, crystal grain thinning, comprehensive mechanical property is improved, improve the microstructure of material
With mechanical property, realize processing modified.
Brief description of the drawings
Fig. 1 is that Figure of description is shown in technological process prepared by high-entropy alloy ingot blank.
Embodiment
By taking AlCrFeNiCuMu as an example, present embodiment is that one kind squeezes complex technique preparation even tissue and power by pier
Learn the AlCrFeNiCuMu that performance significantly improves0.5The method of high-entropy alloy ingot blank, is completed according to the following steps when specific：
(1) high-entropy alloy is prepared：AlCrFeNiCuMu0.5Ingot casting：It is selected to be divided into AlCrFeNiCuMu0.5High-entropy alloy
Ingot casting, the mol ratio of 5 kinds of elements is respectively Al：Cr：Fe：Ni：Cu:Mu=1:1:1:1:1:0.5.
(2) homogenization heat treatment：The AlCrFeNiCuMu that step (1) is chosen0.5High-entropy alloy ingot casting is homogenized
Heat treatment, the temperature for homogenizing heat treatment is 1000 DEG C -1100 DEG C, is then incubated according to The ingot casting thickness 0.8-1min/mm
Processing, the soaking time for homogenizing heat treatment is 12h-100h, obtains the high-entropy alloy ingot casting of interior tissue homogenization of composition.
(3) mushrooming deformation process simulation emulates：Computer Simulation is carried out to deformation process by numerical simulation software, obtained
The regularity of distribution and damage profile of the stress characteristics and rule of deformation process ingot blank different parts, especially three-dimensional compression stress.
On this basis, bond material stress and damage characteristic, deformation and three-dimensional of the analysis high-entropy alloy under the conditions of difference is upset
Compression stress changes with damage profile, optimizes upset scheme and upset ratio, avoids upset generation bulge crackle.Monitor high-entropy alloy
Tissue change and grain size change.
On this basis, the jumping-up scheme of optimization is relied on, to the AlCrFeNiCuMu of first step homogenization0.5High entropy
Alloy ingot blank carries out jumping-up processing, and upper and lower chopping block uses flat anvil plate, and chopping block is preheated to 500 degree, strain rate 0.01s-1-0.1s-1, preferred 0.05s-1。
(4) extrusion process design and analog simulation：By software calculating and analog simulation, analyze in extrusion process
AlCrFeNiCuMu0.5The material flow performance of high-entropy alloy, obtain the extrusion technology program of optimization.On this basis, with reference to point
Result is analysed, carries out AlCrFeNiCuMu0.5High-entropy alloy extrusion process.Extrusion temperature 900-1200 degree, extrusion ratio are less than 2.
(5) upset, extrusion process again：By the AlCrFeNiCuMu after extrusion process0.5Heating stove heat is put into, and
The 3rd step and the 4th step flow are repeated, pier squeezes refinement AlCrFeNiCuMu repeatedly0.5High-entropy alloy tissue, while pass through pier extruding process
It is compound, suppress the germinating and extension of the micro-crack caused by high-entropy alloy severe lattice distorts, with reference to Metallographic Analysis and
Mechanics Performance Testing, finally give the high-entropy alloy ingot blank that crystal grain is more tiny and even tissue, has excellent service ability.
The advantages of present embodiment：
(1) the high-entropy alloy component that present embodiment is prepared by squeezing pier composite modifying method, due in process
In all the time to high-entropy alloy blank implement repeatedly extruding and it is upset, can suppress well high-entropy alloy severe lattice distortion drawn
The germinating and extension of the micro-crack risen, obtain the high-entropy alloy that crystal grain is more tiny and even tissue, has excellent service ability
Ingot blank.
(2) present embodiment can prepare the high-entropy alloy component of large-size, and process can be in tradition
Realized on the process equipment such as hydraulic press or forging hammer, simple and easy, application easy to spread.
Claims (2)
1. it is a kind of specifically for the hot-working of high entropy alloy material and the plastics modification technology of crystal grain refinement, prepare even tissue
The method of high-performance high entropy alloy material, is specifically completed according to the following steps：
(1) making of high-entropy alloy original blank:, then will be according to high-entropy alloy according to ingot blank measure high-entropy alloy bar
Morphological element difference, be heated to 900 DEG C -1200 DEG C of initial temperature, be incubated according to bar thickness 0.8-1min/mm
Processing, 12-100h is incubated, makes its interior tissue uniform；
(2) the upset processing of bar and analysis:With reference to the composition and deformation characteristicses of selected high-entropy alloy, by software calculate with
Analog simulation, obtain the stress characteristics and rule of ingot blank different parts during mushrooming deformation, especially three-dimensional compression stress
The regularity of distribution and damage profile, on this basis, bond material stress and damage characteristic, analysis high-entropy alloy is in different upset bars
Deformation and three-dimensional compression stress under part change with damage profile, optimize upset scheme and upset ratio, avoid upset produce from rousing
Tripe crackle, on this basis, the jumping-up scheme of optimization is relied on, jumping-up processing is carried out to the high-entropy alloy ingot blank homogenized,
Upper and lower chopping block uses flat anvil plate, and chopping block is preheated to 500 degree, strain rate 0.01s-1-0.1s-1, preferred 0.05s-1；
(3) extrusion process and analysis:After the completion of upset, high temperature extrusion is carried out to strained high-entropy alloy embryo material, passes through software
Calculating and analog simulation, the material flow performance of high-entropy alloy in extrusion process is analyzed, obtain the extrusion technology program of optimization,
On the basis of this, binding analysis result, carry out high-entropy alloy extrusion process, reduce blank diameter, increase length of material, extrusion temperature
900-1100 degree, extrusion ratio are less than 2；
(4) upset processing again:High-entropy alloy bar after the completion of extruding is being put into heating furnace heating, insulation, when reaching
After deformation temperature, high-entropy alloy is taken out into progress, and high temperature is upset processing modified again, and deformation temperature is according to material different about 900
DEG C -1200 DEG C, preferably 1100 DEG C, strain rate 0.01s-1-0.1s-1, preferred 0.05s-1；
(5) extrusion process again:Continue the flow of step (3) and step (4) repeatedly, jumping-up extrusion cladding, needed back after extruding
Stove heat, being squeezed by pier repeatedly improves high-entropy alloy tissue, suppresses the fine fisssure caused by high-entropy alloy severe lattice distorts
The germinating and extension of line, obtain the high-entropy alloy ingot blank that crystal grain is more tiny and even tissue, has excellent service ability.
It is 2. according to claim 1 a kind of specifically for the hot-working of high entropy alloy material and the plastics modification of crystal grain refinement
The method that technology prepares the high-performance high entropy alloy material of even tissue, it is characterised in that：1. pier combination process is squeezed to be easily achieved,
Cost is cheap, can obtain the uniform excellent high-entropy alloy ingot blank material of structure property, its service ability be effectively improved, using this
Method can not only promote the high-volume of high-entropy alloy to use, but also can be effectively improved and control the mechanical property of high-entropy alloy
Energy；2. due in process all the time to high-entropy alloy blank implement repeatedly extruding and it is upset, high entropy can be suppressed well
The germinating and extension of the caused micro-crack of alloy severe lattice distortion, obtain that crystal grain is more tiny and even tissue, have excellent
The high-entropy alloy ingot blank of good service ability；3. the three-dimensional compression stress formed in extrusion process used for forming can suppress have high lattice
The germinating and extension of micro-crack in the high-entropy alloy deformation process of distortion, efficiently accomplish the tune that becomes more meticulous of high-entropy alloy microstructure
Control；4. as cast condition high-entropy alloy large dendritic crystal can be crushed by being squeezed by pier repeatedly, improve structural homogenity, significantly improve high-entropy alloy
Service ability under the extreme conditions such as service ability, especially shock resistance.
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| CN201711143614.5A CN107881443B (en) | 2017-11-17 | 2017-11-17 | A kind of crowded pier composite modifying method of high-entropy alloy |
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| CN201711143614.5A CN107881443B (en) | 2017-11-17 | 2017-11-17 | A kind of crowded pier composite modifying method of high-entropy alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109675949A (en) * | 2019-01-10 | 2019-04-26 | 北京理工大学 | A kind of reciprocating extrusion processing method of high-entropy alloy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000015326A (en) * | 1998-07-02 | 2000-01-18 | Daido Steel Co Ltd | Die for copper hot extrusion and its manufacture |
| CN105543749A (en) * | 2015-12-10 | 2016-05-04 | 北京理工大学 | High-entropy alloy gradient stress modification technology |
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- 2017-11-17 CN CN201711143614.5A patent/CN107881443B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000015326A (en) * | 1998-07-02 | 2000-01-18 | Daido Steel Co Ltd | Die for copper hot extrusion and its manufacture |
| CN105543749A (en) * | 2015-12-10 | 2016-05-04 | 北京理工大学 | High-entropy alloy gradient stress modification technology |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109675949A (en) * | 2019-01-10 | 2019-04-26 | 北京理工大学 | A kind of reciprocating extrusion processing method of high-entropy alloy |
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