CN105543749B - High-entropy alloy gradient stress modification technology - Google Patents
High-entropy alloy gradient stress modification technology Download PDFInfo
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- CN105543749B CN105543749B CN201510917598.5A CN201510917598A CN105543749B CN 105543749 B CN105543749 B CN 105543749B CN 201510917598 A CN201510917598 A CN 201510917598A CN 105543749 B CN105543749 B CN 105543749B
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- entropy alloy
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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
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
Abstract
The present invention relates to a kind of gradient stress plastics modification method that Damage Coutrol specifically designed for high entropy alloy material feature and delicate tissues regulate and control.The invention aims to solve high-entropy alloy as-cast structure based on large dendritic crystal, the problem of its comprehensive mechanical property is poor.Preparation method mainly includes：Prepare high-entropy alloy ingot casting, homogenization heat treatment, analogue simulation, canned forging obtains the ingot blank of high-entropy alloy.The stress state in default variable cross-section jacket, effective control process inside high entropy alloy material is mainly used when the present invention is handled high-entropy alloy ingot casting, the gradient three-dimensional compression stress for combining deformation behaviour is formed.The present invention finally can effectively suppress the germinating and extension of the micro-crack of distortion of lattice induction, and crystal grain thinning improves comprehensive mechanical property, realizes effective modification of high-entropy alloy.
Description
Technical field
The present invention relates to the plasticity that a kind of Damage Coutrol specifically designed for high entropy alloy material feature and delicate tissues regulate and control
Method of modifying.
Background technology
With the development of modern industry, people propose in terms of temperature in use, intensity, hardness and wearability to material
Higher and higher requirement, although people continuously attempt to develop new process technology, designs new material composition, making up material
The deficiency of performance, but the defective that this conventional alloys design exists in itself seriously constrains industrial expansion.
Exactly under this background, people have broken traditional alloy design concept, are gone out using the conceptual design of multi-principal elements alloy new
Alloy system, high-entropy alloy.
High-entropy alloy is different from conventional alloys and is based on one or two kinds of elements as essential element, a small amount of other by addition
Element to improve the traditional material design concept of alloy structure performance, in high-entropy alloy every kind of pivot be respectively provided with it is higher, but
Molar fraction no more than 35%, forms multielement collective effect, shows excellent comprehensive mechanical property, wherein
AlCoCrFeNiTi0.5Quasistatic yield strength up to 2.26GPa, fracture strength 3.0GPa, compression plasticity 23% is far above
Active service conventional material.
But high-entropy alloy as-cast structure is based on thick dendrite, the performance of its comprehensive mechanical property is had a strong impact on, especially
Under the conditions of dynamic impulsion, there is huge hidden dangers in project in easily induced breakage.
Plastic working can effectively crush large dendritic crystal, and crystal grain thinning improves the microstructure and mechanical property of material.But
High intensity high-entropy alloy generally requires to add more thick atom radius element to improve its mechanical property, causes crystal to produce abnormal
Become serious, easily ftractureed in plastic processing.
In consideration of it, the present invention proposes that one kind has targetedly gradient stress plastics modification technology, according to high-entropy alloy material
The characteristics of material composition and ingot blank geometry, what the cross section geometry that design processing is adapted with ingot blank changed according to certain rules
Ingot blank jacket, by applying variable cross-section jacket, effectively ingot blank internal stress in control plastic processing to high-entropy alloy ingot blank
Distribution, forms the gradient three-dimensional compression stress for deformation process feature, effectively suppresses micro-crack in high-entropy alloy deformation process
Germinating and extension, complete effective control that becomes more meticulous to high-entropy alloy microstructure, realize efficient plastics modification, effectively improve
The service ability of high-entropy alloy.
The content of the invention
It is an object of the invention to：A kind of gradient stress plastics modification method for high-entropy alloy service demand is provided.
For the hot-working feature of high-entropy alloy, using default variable cross-section jacket, high entropy alloy material in deformation process is effectively controlled
Internal stress state, forms the gradient three-dimensional compression stress for combining deformation behaviour, effectively suppresses the fine fisssure that distortion of lattice induces
The germinating and extension of line, crystal grain thinning improve comprehensive mechanical property, realize effective modification of high-entropy alloy.
This method and aftertreatment technology are easily operated, with low cost, result in the uniform excellent high entropy of structure property and close
Ingot blank material material, effectively improves its service ability, and the high-volume that can not only promote high-entropy alloy using this method is used, but also
It can be effectively improved and control the mechanical property of high-entropy alloy.
In order to solve the above technical problems, high-entropy alloy gradient stress method of modifying of the present invention using following technical scheme come real
Existing.
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, is heated to 1000 DEG C -1100 DEG C of initial temperature, then according to bar thickness 0.8-
1min/mm carries out isothermal holding, is incubated 12-100h, and furnace cooling makes its interior tissue uniform.
Second step：The analysis design of variable cross-section jacket.With reference to the composition and deformation characteristicses of selected high-entropy alloy, pass through
Calculate and analog simulation, obtain the stress characteristics and rule, especially three-dimensional compression stress of ingot blank different parts in deformation process
The regularity of distribution and damage profile.
On this basis, bond material stress and damage characteristic, select sheath material and design variable cross-section wrapping structure, point
Analyse deformation and three-dimensional compression stress of the high-entropy alloy under the conditions of variable cross-section jacket with damage profile to change, optimize variable cross-section bag
Nested structure.
3rd step：Variable cross-section jacket is processed.According to design, by lathe or machining center, variable cross-section jacket is processed,
To ensure effective combination of jacket and high-entropy alloy ingot blank, it is necessary to ensure that jacket has good machining accuracy, while being control
Manufacturing cost, material is based on conventional carbon steel and stainless steel.Jacket ratio of height to diameter is between 1:1 to 1.5:Between 1.
4th step：High-temperature gradient stress is modified.High-entropy alloy ingot casting after homogenization is inserted in corresponding tool at room temperature
There is the jacket of different cross section shape, hereafter insert heating furnace heating, insulation.After up to road deformation temperature, by the height of additional jacket
Entropy alloy, which takes out, carries out high-temp plastic modification.Different about 1000 DEG C -1100 DEG C according to material of deformation temperature, preferably 1100 DEG C,
Strain rate 0.01s-1-0.1s-1, preferred 0.05s-1.Pulled out after first jumping-up, Upsetting amount is unsuitable excessive, needs to melt down after pulling
Heating, while ensure that jacket is combined closely with high-entropy alloy in deformation process, to form effective gradient three-dimensional compression stress, with
Suppress because high-entropy alloy severe lattice distorts the germinating and extension of caused micro-crack, obtain crystal grain more tiny and organize
Uniformly, the high-entropy alloy ingot blank with excellent service ability.According to the difference of high-entropy alloy, variable cross-section jacket gradient stress is modified
Material afterwards can directly using air cooling handle, also can stove it is cold.
5th step：Peel off.Variable cross-section jacket is divested using machining process.
Compared with prior art, beneficial effects of the present invention are as follows：
High-entropy alloy as-cast structure is had a strong impact on the performance of its comprehensive mechanical property, especially existed based on thick dendrite
Under the conditions of dynamic impulsion, there is huge hidden dangers in project, it is necessary to carry out plastic working modification in easily induced breakage.And due to height
Intensity high-entropy alloy is serious for often crystal lattice distortion, is easily ftractureed in plastic processing.Can be with by applying outer wrap
Compression stress is effectively improved, but due to ingot blank material and the difference of physical dimension, uiform section bag can not be formed for deformation process
Effective gradient compression stress, cracking can not be effectively suppressed for the serious high-entropy alloy of distortion of lattice, complete to crush thick branch
Crystalline substance, crystal grain thinning improves the microstructure and mechanical property of material, realized processing modified.
In consideration of it, the present invention proposes that one kind has targetedly gradient stress plastics modification technology, according to high-entropy alloy material
The characteristics of material composition and ingot blank geometry, what the cross section geometry that design processing is adapted with ingot blank changed according to certain rules
Ingot blank jacket, by applying variable cross-section jacket, effectively ingot blank internal stress in control plastic processing to high-entropy alloy ingot blank
Distribution, forms the gradient three-dimensional compression stress for deformation process feature, effectively suppresses micro-crack in high-entropy alloy deformation process
Germinating and extension, complete effective control that becomes more meticulous to high-entropy alloy microstructure, realize efficient plastics modification, effectively improve
The service ability of high-entropy alloy.
The present invention is using the high-entropy alloy original blank of casting, and tiny by gradient stress modification acquisition crystal grain, tissue is equal
Even, the ingot blank that comprehensive service ability is obviously improved can be greatly lowered processing cost and improve material military service ability.Institute of the present invention
It is easily obtained with variable cross-section sheath material, it is easy to process simple, it can be processed by engine lathe or machining center, and gradient should
Power modifying process can be realized on the process equipment such as conventional hydraulic machine or forging hammer, simple and easy to apply, it is easy to popularization and application.
Brief description of the drawings
Fig. 1 is process chart prepared by high-entropy alloy ingot blank.
Embodiment
By taking AlCoCrFeNiTi as an example, it is equal that present embodiment is that one kind by high-temperature gradient stress modification technology prepares tissue
The AlCoCrFeNiTi that even and mechanical property is significantly improved0.5The method of high-entropy alloy ingot blank, it is complete according to the following steps when specific
Into：
(1) high-entropy alloy AlCoCrFeNiTi is prepared0.5Ingot casting：It is selected to be divided into AlCoCrFeNiTi0.5High-entropy alloy
Ingot casting, the mol ratio of 6 kinds of elements is respectively Al：Co：Cr：Fe：Ni：Ti=1:1:1:1:1:0.5.
(2) homogenization heat treatment：The AlCoCrFeNiTi that step (1) is chosen0.5High-entropy alloy ingot casting carries out homogenization heat
Processing, the temperature of homogenization heat treatment is 1000 DEG C -1100 DEG C, is then carried out according to The ingot casting thickness 0.8-1min/mm at insulation
Reason, the soaking time of homogenization heat treatment is 12h-100h, then by high-entropy alloy AlCoCrFeNiTi0.5Ingot casting it is cold with stove
But, the high-entropy alloy ingot casting of interior tissue homogenization of composition is obtained.
(3) deformation process analog simulation：Computer Simulation is carried out to deformation process by numerical simulation software, deformed
The regularity of distribution and damage profile of the stress characteristics and rule, especially three-dimensional compression stress of process ingot blank different parts.
(4) jacket is designed：According to the analog simulation result in step (3), select sheath material and design variable cross-section jacket
Structure, optimizes the cross section structure and size of jacket diverse location by analog simulation on this basis, until forming process has
More uniform three-dimensional compressive stress.
(5) jacket is processed：According to the variable cross-section wrapping structure size obtained in step (4), by lathe and processing
The heart, processes variable cross-section jacket.Sheath material in this step generally uses conventional carbon steel and stainless steel, jacket ratio of height to diameter between
1:1 to 1.5:Between 1.
(6) high-temperature gradient stress is modified：Homogenization in step (2) is thermally treated resulting in high-entropy alloy AlCoCrFeNiTi0.5
Take out, be put into step (5) in the obtained variable cross-section jacket of processing, obtain including high-entropy alloy AlCoCrFeNiTi0.5Pre-add
The ingot blank of work blank.Ingot blank is heated to 1050 DEG C, upsetting pull modification is carried out.Strain rate 0.05s-1, pull out after first jumping-up.According to
The difference of physical dimension, can be pulled out with every fiery upsetting one or two upsettings two are pulled out, then reheated.Room temperature is air-cooled to after three fire time,
Jacket is peeled off using machining, as cast condition branch crystalline substance is obtained and crushes completely, even tissue good mechanical performance
AlCoCrFeNiTi0.5High entropy alloy material.
Mould used in the step is high temperature alloy mould.To ensure that jacket is closed with high entropy as far as possible in modifying process
Gold is combined closely, to form effective gradient three-dimensional compression stress.And Upsetting amount is unsuitable excessive, need to melt down after pulling plus
Heat.
According to the difference of high-entropy alloy, the modified material of variable cross-section jacket gradient stress can be handled directly using air cooling,
Also can stove it is cold.
The advantage of present embodiment：
(1) the high-entropy alloy component that present embodiment is prepared by high-temperature gradient stress method of modifying, due in process
In all the time to high-entropy alloy formation effectively gradient three-dimensional compression stress, the distortion of high-entropy alloy severe lattice can be suppressed well
The germinating and extension of caused micro-crack, obtain that crystal grain is more tiny and even tissue, the high entropy with excellent service ability
Alloy ingot blank.
(2) present embodiment can prepare the high-entropy alloy component of large-size, and gradient stress modifying process can
It is simple and easy to apply, it is easy to popularization and application to be realized on the process equipment such as conventional hydraulic machine or forging hammer.
Claims (2)
1. a kind of method for the high-performance high entropy alloy material that even tissue is prepared by high-temperature gradient stress modification technology, specifically
Complete according to the following steps：
(1) requirement of Service Environment, the high-entropy alloy ingot casting required for preparing are directed to；
(2) homogenization heat treatment：The ingot casting for the high-entropy alloy that step (1) is chosen is carried out at homogenization heat treatment, homogenization heat
The temperature of reason is 1000 DEG C -1100 DEG C, then according to The ingot casting thickness 0.8-1min/mm progress isothermal holdings, then furnace cooling,
Obtain the high-entropy alloy ingot casting of interior tissue homogenization of composition；
(3) deformation process analog simulation：Computer Simulation is carried out to deformation process by simulation softward, deformation process ingot blank is obtained
The stress characteristics and rule of different parts；
(4) jacket is designed：According to the analog simulation result in step (3), sheath material is selected, the sheath material is conventional carbon
Steel or stainless steel, and design variable cross-section wrapping structure；Optimize the section of jacket diverse location by analog simulation on this basis
Structure and size, until forming process has uniform three-dimensional compressive stress；
(5) jacket is processed：According to the variable cross-section wrapping structure size obtained in step (4), by lathe and machining center, plus
Work can form the variable cross-section jacket of three-dimensional compression stress in deformation process, and jacket ratio of height to diameter is between 1:1 to 1.5:Between 1；
(6) high-temperature gradient stress is modified：Homogenization in step (2) is thermally treated resulting in high-entropy alloy AlCoCrFeNiTi0.5It is put into
In step (5) in the obtained variable cross-section jacket of processing, obtain including high-entropy alloy AlCoCrFeNiTi0.5Pre-manufactured blanks
Ingot blank；Ingot blank is heated to high temperature modified processing temperature, upsetting pull modification is carried out：Pulled out after first upsetting, many fire time processing, after the completion of cool down
To room temperature, jacket is peeled off using machining, the high entropy alloy material of even tissue good mechanical performance is obtained.
2. a kind of high entropy of high-performance that even tissue is prepared by high-temperature gradient stress modification technology according to claim 1
The method of alloy material, it is characterised in that：First, in step 4 jacket to be designed according to deformation process ingot blank internal stress distribution
Sectional dimension there is the variable cross-section jacket of certain changing rule；2nd, ensure high in deformation process by applying variable cross-section jacket
Entropy alloy is internally formed the gradient three-dimensional compression stress with good repair ability；3rd, the gradient three formed in deformation process
The germinating and extension of micro-crack in the high-entropy alloy deformation process with high distortion of lattice can be suppressed to compression stress, it is effectively complete
Into the regulation and control that become more meticulous of high-entropy alloy microstructure；4th, by compressing the adaptive broken as cast condition of microstress with three-dimensional
High-entropy alloy large dendritic crystal, improves structural homogenity, significantly improves high-entropy alloy service ability.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105970132B (en) * | 2016-06-03 | 2018-06-12 | 北京理工大学 | Regulate and control AlxThe method of CoCrFeNi two-phase high-entropy alloy tissues |
| CN107083527B (en) * | 2017-04-20 | 2019-03-05 | 南京工程学院 | A method of heat treatment combines plastic deformation to improve single-phase high-entropy alloy intensity |
| CN107881443B (en) * | 2017-11-17 | 2019-07-16 | 北京理工大学 | A kind of crowded pier composite modifying method of high-entropy alloy |
| CN108004492A (en) * | 2017-11-17 | 2018-05-08 | 北京理工大学 | A kind of efficient controlled rolling method of modifying of high-entropy alloy |
| CN108220837A (en) * | 2018-01-19 | 2018-06-29 | 北京理工大学 | High-entropy alloy mismatch, which is cut, pulls out processing technology |
| CN108342668A (en) * | 2018-01-19 | 2018-07-31 | 北京理工大学 | High-entropy alloy turns round pier and pulls out Combined Machining Technology |
| CN108918308A (en) * | 2018-05-16 | 2018-11-30 | 太原理工大学 | A kind of quantitatively characterizing method of titanium alloy surface gradient modified layer Elastoplastic Performances in Simulation parameter |
| CN109457197B (en) * | 2019-01-10 | 2020-06-23 | 北京理工大学 | Ultrasonic and pressure integrated auxiliary high-entropy alloy heat treatment technology |
| CN109706363B (en) * | 2019-01-11 | 2020-01-21 | 中南大学 | Eutectic high-entropy alloy and preparation method thereof |
| CN112756524B (en) * | 2020-12-18 | 2022-08-23 | 陕西宏远航空锻造有限责任公司 | Quasi-beta forging heating method and device for variable-section-thickness titanium alloy forging |
| CN112941397A (en) * | 2021-03-09 | 2021-06-11 | 贵州航天新力科技有限公司 | Light medium-entropy alloy with excellent high-temperature mechanical properties and processing technology thereof |
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| CN102776430A (en) * | 2012-08-20 | 2012-11-14 | 太原理工大学 | AlCoCrFeNiTix high-entropy alloy material and method for preparing same |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102776430A (en) * | 2012-08-20 | 2012-11-14 | 太原理工大学 | AlCoCrFeNiTix high-entropy alloy material and method for preparing same |
Non-Patent Citations (2)
| Title |
|---|
| Microstructural characterisation of high-entropy alloy AlCoCrFeNifabricated by laser engineered net shaping;I. Kunce et.al.;《Journal of Alloys and Compounds》;20150619;第648卷;第751-758页 * |
| Yuan Yu等.Characterization of BCC phases in AlCoCrFeNiTix high entropy alloys.《Materials Letters》.2014,第138卷第78-80页. * |
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