CN107881443B - A kind of crowded pier composite modifying method of high-entropy alloy - Google Patents
A kind of crowded pier composite modifying method of high-entropy alloy Download PDFInfo
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- CN107881443B CN107881443B CN201711143614.5A CN201711143614A CN107881443B CN 107881443 B CN107881443 B CN 107881443B CN 201711143614 A CN201711143614 A CN 201711143614A CN 107881443 B CN107881443 B CN 107881443B
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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
- C22C—ALLOYS
- 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 present invention relates to a kind of plastics modification method of hot-working specifically for high entropy alloy material and crystal grain refinement, the method for preparing the high-performance high entropy alloy material of even tissue.The purpose of the present invention essentially consists in: providing a kind of crowded pier compound plastic method of modifying for high-entropy alloy service demand.For the hot-working feature of high-entropy alloy, it is squeezed again using first pier, pier again is squeezed, the crowded method of pier repeatedly effectively controls the stress state in deformation process inside high entropy alloy material, improves three-dimensional compression stress, the germinating and extension for the micro-crack for effectively distortion of lattice being inhibited to induce, crystal grain is refined, comprehensive mechanical property is improved, realizes effective modification of high-entropy alloy.Pier combination process is squeezed to be easily achieved, it is low in cost, the uniform excellent high-entropy alloy ingot blank material of structure property can be obtained, its service ability is effectively improved, the high-volume of high-entropy alloy can not only be promoted to use using this method, 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 plastics modification methods specifically for high entropy alloy material hot-working and crystal grain refinement.
Background technique
High-entropy alloy is the brand-new material being widely noticed 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 since high entropy closes
Golden distortion of lattice is serious, and as-cast structure is typical pine-tree structure, and plasticity is lower under the conditions of high temperature deformation, simultaneously because casting
The presence of defect, easy to crack after high temperature forging, excellent mechanical property is unable to get in engineer application to be given full play to,
Significantly limit the large-scale engineering applications of high-entropy alloy.In order to eliminate casting flaw, forging is generallyd use to high-entropy alloy
It is modified.
High temperature forging is important materials processing technology, can be closed micro-crack, smash dendrite, be effectively improved material
Structure property is the important modification method of metal material.But high-entropy alloy is easily formed in forging process since distortion of lattice is serious
Crackle greatly hinders the application of plastic processing forging modified technique.
Jumping-up processing is to reduce forge piece blank reheating height in forging processing, the forming technology that cross-sectional area increases.When jumping-up,
Friction is contacted due to existing between two end faces and forging equipment chopping block above and below material, causes material imperfect flow, will lead to
Temperature, stress condition, deformation extent, structural transformation of material different zones etc. are uneven, and for high-entropy alloy jumping-up,
Due to the collective effect of the above problem and distortion of lattice problem, Chang Yi generates crackle longitudinal or in 45 ° of directions in side surface.
It squeezes, is that external force is applied to the metal stock being placed in mould cavity (or extrusion cylinder), forces metal from die hole
It squeezes out, the plastic processing method of end surface shape needed for obtaining, size and the extruding product with certain mechanical properties, stress shape
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 plastic processing method simply easily realized, that is, pier composite modifying method is squeezed, squeezes pier
The compound stress state that can improve material internal improves three-dimensional compressive stress, reduces tensile stress level to improve formability of materials
Can forging method, played an important role and meaning for improving high-entropy alloy plastic deformation ability.By to high-entropy alloy
Ingot blank, which applies, sufficiently 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 inhibits the germinating and extension of micro-crack in high-entropy alloy deformation process,
Crystal grain is refined, completion effectively controls the fining of high-entropy alloy microstructure, realizes efficient plastics modification, this process can be
It is realized on the process equipments such as conventional extruded cylinder and forging hammer, it is simple and easy, easily promote and apply.
Summary 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.
It for the hot-working feature of high-entropy alloy, is squeezed again using first pier, has squeezed pier again, repeatedly the crowded method of pier, effectively control deformed
Stress state in journey inside high entropy alloy material improves three-dimensional compression stress, the micro-crack for effectively distortion of lattice being inhibited to induce
Germinating and extension, refine crystal grain, improve comprehensive mechanical property, realize effective modification of high-entropy alloy.
Pier combination process is squeezed to be easily achieved, it is low in cost, the uniform excellent high-entropy alloy ingot blank of structure property can be obtained
Material effectively improves its service ability, the high-volume of high-entropy alloy can not only be promoted to use using this method, but also can have
Effect improves and the mechanical property of control high-entropy alloy.
It is realized in order to solve the above technical problems, the present invention squeezes pier composite modifying method using following technical scheme:
Step 1: the production 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 is heated to 900 DEG C -1200 DEG C of initial temperature, according to bar thickness 0.8-1min/mm
Isothermal holding is carried out, 12-100h is kept the temperature, promotes its interior tissue uniform.
Step 2: the analysis of high-entropy alloy bar upsetting process and jumping-up processing.In conjunction with selected high-entropy alloy composition with
And deformation characteristics, 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 and damage profile of the analysis high-entropy alloy under the conditions of different upset change, are 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 carries out jumping-up processing to the high-entropy alloy ingot blank of first step homogenization, and upper and lower chopping block uses flat anvil plate, and chopping block is pre-
Heat is to 500 DEG C, strain rate 0.01s-1-0.1s-1, preferred 0.05s-1。
Step 3: the analysis of high-entropy alloy extrusion process 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 characteristics of high-entropy alloy in extrusion process is analyzed, is obtained
The extrusion technology program that must optimize.On this basis, for binding analysis as a result, carrying out high-entropy alloy extrusion process, reduction blank is straight
Diameter increases length of material.900-1100 DEG C of temperature is squeezed, extrusion ratio is less than 2.
Step 4: circulation is upset.High-entropy alloy bar after the completion of extruding is placed into heating furnace heating, heat preservation.When reaching
To after deformation temperature, high-entropy alloy is taken out 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。
Step 5: cycle extrusion.Extrusion process again is carried out to by the high-entropy alloy blank of jumping-up again, squeezes temperature
900-1100 DEG C, extrusion ratio is less than 2.
Continue the 4th step and the 5th step process repeatedly, jumping-up extrusion cladding circulation, until acquisition crystal grain fine tissue is uniform,
High-entropy alloy ingot blank with excellent service ability, processed high-entropy alloy structure property meet service demand.
Compared with prior art, beneficial effects of the present invention are as follows:
High-entropy alloy is made of multielement constituent element, and as-cast structure is mostly based on coarse dendrite, this institutional framework meeting
The serious comprehensive performance for influencing high-entropy alloy.It can be crushed dendrite, refinement crystal grain by plastic processing, but since high entropy closes
The presence of large atomic radius constituent element in gold, causes it there are serious distortion of lattice, is easy to cause out in plastic history
It splits, the formation of crackle can seriously affect the application of material.It can effectively improve compression stress by squeezing pier Compound Machining, control becomes
Stress state during shape inside high entropy alloy material improves three-dimensional compression stress, completes to press down while broken large dendritic crystal
The germinating and extension for the micro-crack that distortion of lattice processed induces refine crystal grain, improve comprehensive mechanical property, improve the microstructure of material
With mechanical property, realize processing modified.
Detailed description of the invention
Figure of description 1 is shown in the process flow of high-entropy alloy ingot blank preparation.
Specific embodiment
By taking AlCrFeNiCuMu as an example, present embodiment is a kind of by the crowded complex technique preparation even tissue of pier and power
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) prepare high-entropy alloy: AlCrFeNiCuMu0.5Ingot casting: it is selected to be divided into AlCrFeNiCuMu0.5High-entropy alloy
Ingot casting, the molar 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 kept the temperature according to 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: carrying out Computer Simulation to deformation process by numerical simulation software, obtains
The stress characteristics and rule, the especially regularity of distribution and damage profile of three-dimensional compression stress of deformation process ingot blank different parts.
On this basis, bond material stress and damage characteristic, deformation and three-dimensional of the analysis high-entropy alloy under the conditions of different upset
Compression stress and damage profile change, and optimize upset scheme and upset ratio, avoid upset generation bulge crackle.Monitor high-entropy alloy
Tissue change and grain size variation.
On this basis, the jumping-up scheme for relying on optimization, 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: being calculated by software and analog simulation, is analyzed in extrusion process
AlCrFeNiCuMu0.5The material flow characteristics of high-entropy alloy, obtains the extrusion technology program of optimization.On this basis, in conjunction with point
Analysis is as a result, carry out AlCrFeNiCuMu0.5High-entropy alloy extrusion process.Temperature 900-1200 degree is squeezed, extrusion ratio is less than 2.
(5) upset, extrusion process again: by the AlCrFeNiCuMu after extrusion process0.5It is put into heating stove heating, and
Step 3 and step 4 process are repeated, pier squeezes refinement AlCrFeNiCuMu repeatedly0.5High-entropy alloy tissue, while passing through pier extruding process
It is compound, inhibit the germinating and extension of the micro-crack due to caused by the distortion of high-entropy alloy severe lattice, in conjunction with Metallographic Analysis and
Mechanics Performance Testing, finally obtains that crystal grain is more tiny and even tissue, the high-entropy alloy ingot blank with 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 the implementation of high-entropy alloy blank is repeatedly extruded and upset always, the distortion of high-entropy alloy severe lattice can be inhibited to be drawn well
The germinating and extension of the micro-crack risen, obtain that crystal grain is more tiny and even tissue, the high-entropy alloy with excellent service ability
Ingot blank.
(2) present embodiment can prepare the high-entropy alloy component of larger size, and process can be in tradition
It is realized on the process equipments such as hydraulic press or forging hammer, simple and easy, application easy to spread.
Claims (1)
1. it is a kind of specifically for the hot-working of high entropy alloy material and the plastics modification method 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) production 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, kept the temperature according to bar thickness 0.8-1min/mm
Processing keeps the temperature 12-100h, keeps its interior tissue uniform；
(2) the upset processing of bar and analysis: in conjunction with the composition and deformation characteristics of selected high-entropy alloy, by software calculate with
Analog simulation obtains the stress characteristics and rule of ingot blank different parts during mushrooming deformation, and on this basis, bond material is answered
Power and damage characteristic, deformation and three-dimensional compression stress and damage profile of the analysis high-entropy alloy under the conditions of different upset become
Change, optimizes upset scheme and upset ratio, avoid upset generation bulge crackle, on this basis, rely on the jumping-up scheme of optimization, it is right
The high-entropy alloy ingot blank homogenized carries out jumping-up processing, and upper and lower chopping block uses flat anvil plate, and chopping block is preheated to 500 DEG C, strain
Rate 0.01s-1-0.1s-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 analyze the material flow characteristics of high-entropy alloy in extrusion process, obtain the extrusion technology program of optimization,
On the basis of this, as a result, carrying out high-entropy alloy extrusion process, reduction blank diameter increases length of material, squeezes temperature binding analysis
900-1100 DEG C, extrusion ratio is less than 2；
(4) upset processing again: the high-entropy alloy bar after the completion of extruding is being put into heating furnace heating, heat preservation, when reaching
After deformation temperature, high-entropy alloy is taken out progress, and high temperature is upset processing modified again, and deformation temperature is not all 900 according to material
DEG C -1200 DEG C, strain rate 0.01s-1-0.1s-1；
(5) extrusion process again: continuing repeatedly the process of step (3) and step (4), and jumping-up extrusion cladding needs back after extruding
Stove heating, being squeezed by pier repeatedly improves high-entropy alloy tissue, inhibits the fine fisssure due to caused by the distortion of high-entropy alloy severe lattice
The germinating and extension of line, obtain that crystal grain is more tiny and even tissue, the high-entropy alloy ingot blank with excellent service ability.
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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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| CN107881443A CN107881443A (en) | 2018-04-06 |
| CN107881443B true CN107881443B (en) | 2019-07-16 |
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| JP2000015326A (en) * | 1998-07-02 | 2000-01-18 | Daido Steel Co Ltd | Die for copper hot extrusion and its manufacture |
| CN105543749B (en) * | 2015-12-10 | 2017-10-17 | 北京理工大学 | High-entropy alloy gradient stress modification technology |
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