CN112210731A - Method for regulating and controlling non-uniform structure of high-entropy alloy - Google Patents

Method for regulating and controlling non-uniform structure of high-entropy alloy Download PDF

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CN112210731A
CN112210731A CN202011111417.7A CN202011111417A CN112210731A CN 112210731 A CN112210731 A CN 112210731A CN 202011111417 A CN202011111417 A CN 202011111417A CN 112210731 A CN112210731 A CN 112210731A
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entropy alloy
heat treatment
recrystallization
volume fraction
uniform structure
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何峰
杨中晟
王志军
李俊杰
王锦程
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Northwestern Polytechnical University
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Abstract

The invention discloses a method for regulating and controlling a non-uniform structure of a high-entropy alloy, which belongs to the technical field of alloy material preparation and comprises the following steps: s1, cold rolling the high-entropy alloy; respectively carrying out heat treatment on the cold-rolled high-entropy alloy at a set temperature for different times to obtain multiple groups of high-entropy alloys in different heat treatment states; s2, respectively counting the recrystallization volume fraction of the high-entropy alloy in S1 different heat treatment states; s3, carrying out parameter fitting of a JMAK model on the recrystallized volume fraction counted in the S2 and the corresponding heat treatment time to obtain a recrystallization kinetic rule; s4, regulating and controlling the heat treatment time according to the S3 recrystallization kinetic rule, and obtaining the target recrystallization volume fraction non-uniform tissue; the invention firstly draws a high-entropy alloy recrystallization dynamics curve, namely a quantitative relation between the heat treatment parameters of the high-entropy alloy and the integral number of the recrystallized body of the non-uniform structure, and the method is more efficient in obtaining the expected non-uniform structure.

Description

Method for regulating and controlling non-uniform structure of high-entropy alloy
Technical Field
The invention belongs to the technical field of alloy material preparation, and particularly relates to a method for regulating and controlling a non-uniform structure of a high-entropy alloy.
Background
The metal and the alloy are the most commonly used stressed parts in the industry, and the tensile strength and the elongation rate of the metal and the alloy determine the use upper limit of the material, so that the strength and the plasticity of the structural metal material are further improved, the application field of the metal and the alloy is widened, the material is saved, the processing cost is reduced, and the pollution to the environment is reduced.
In recent years, high-entropy alloy is used as a novel alloy, and dislocation motion can be greatly hindered due to a solid solution strengthening effect brought by the characteristic of multiple principal elements, so that the high-entropy alloy has more excellent mechanical properties than traditional metals. Researches find that the high-entropy alloy with the non-uniform structure has more excellent mechanical properties, but at present, a small amount of high-entropy alloy with the non-uniform structure can be obtained only under specific heat treatment conditions, and the evolution rule of the alloy structure in the heat treatment process is not clear, so that the acquisition and the regulation of the non-uniform structure in the high-entropy alloy are lack of pertinence and guidance, and the obtained non-uniform structure has great randomness.
Disclosure of Invention
In order to solve the problems, the invention provides a method for regulating and controlling the non-uniform structure of the high-entropy alloy, which is used for drawing a recrystallization dynamics curve of the high-entropy alloy, disclosing the quantitative relation between the heat treatment parameters of the high-entropy alloy and the integral number of recrystallized bodies of the non-uniform structure, guiding the high-entropy alloy to obtain a target non-uniform structure and solving the problem of obtaining the randomness of the non-uniform structure at present.
The invention is realized by the following technical scheme.
A method for regulating and controlling a non-uniform structure of a high-entropy alloy comprises the following steps:
s1, cold rolling the high-entropy alloy; respectively carrying out heat treatment on the cold-rolled high-entropy alloy at a set temperature for different times to obtain multiple groups of high-entropy alloys in different heat treatment states; the set temperature is 40% -70% of the melting point of the high-entropy alloy;
s2, respectively counting the recrystallization volume fraction of the high-entropy alloy in S1 different heat treatment states;
s3, carrying out parameter fitting of a JMAK model on the recrystallized volume fraction counted in the S2 and the corresponding heat treatment time to obtain a recrystallization kinetic rule of the high-entropy alloy at the set temperature;
the recrystallization kinetics law can be represented by formula (I):
X＝1—exp(-Btn)
(Ⅰ)
wherein B and n are constants, X is the recrystallization volume fraction, and t is the heat treatment time;
and S4, regulating and controlling the heat treatment time according to the S3 recrystallization kinetic rule, and obtaining the target recrystallization volume fraction of the non-uniform tissue.
Preferably, in S1, the cold rolling process has a deformation amount of 50% to 90%.
Preferably, in S1, the heat treatment time is in the range of 5-300 min.
Preferably, in S2, the statistical method of the recrystallized volume fraction specifically includes:
acquiring a high-entropy alloy scanning electron microscope picture after heat treatment; and carrying out grid division on the scanning electron microscope picture, respectively counting the number of grid points occupied by the recrystallized grains and the number of total grid points, and obtaining the ratio of the number of grid points occupied by the recrystallized grains to the number of total grid points, namely the recrystallized volume fraction of the high-entropy alloy.
Preferably, the high entropy alloy is a single phase FCC high entropy alloy.
Preferably, the high-entropy alloy is NiCoCrFe or Ni2CoCrFe。
Compared with the prior art, the invention has the following beneficial effects:
(1) the method firstly draws a high-entropy alloy recrystallization dynamics curve, namely a quantitative relation between a high-entropy alloy heat treatment parameter and the integral number of the recrystallized body of the non-uniform structure, can efficiently obtain a target non-uniform structure, and solves the problem of obtaining the randomness of the non-uniform structure at present;
(2) the invention guides to obtain the target heterogeneous structure in the high-entropy alloy according to the dynamic law of recrystallization of the high-entropy alloy, the error between the predicted heterogeneous structure and the actual volume fraction is small (the error is within 7 percent), the result is accurate, and the method is suitable for popularization and application.
Drawings
FIG. 1 is a graph showing that the integral number of recrystallized bodies of the high-entropy alloy with the heat treatment time of 35min in example 5 is counted by adopting a metallographic grid method;
FIG. 2 is a graph of the recrystallization kinetics of high entropy alloys at 575 deg.C/600 deg.C/650 deg.C;
wherein, (a) NiCoCrFe; (b) ni2CoCrFe；
FIG. 3 is a graph of EBSD of an incompletely recrystallized non-uniform structure;
wherein (a) NiCoCrFe is kept at 600 ℃ for 23min, the actual recrystallization volume fraction is 57%, and the predicted recrystallization volume fraction is 50%; (b) ni2The CoCrFe is kept at 600 ℃ for 26min, the actual recrystallization volume fraction is 22%, and the predicted recrystallization volume fraction is 25%.
Detailed Description
In order to make the technical solutions of the present invention better understood and implemented by those skilled in the art, the present invention is further described below with reference to the following specific embodiments and the accompanying drawings, but the embodiments are not meant to limit the present invention. The experimental methods and the detection methods described in the following examples are all conventional methods unless otherwise specified; the materials are commercially available, unless otherwise specified.
Example 1
A method for regulating and controlling a non-uniform structure of a high-entropy alloy comprises the following steps:
s1, cutting the NiCoCrFe high-entropy alloy according to the rolling size of a cold rolling mill, and performing cold rolling; cold rolling the high-entropy alloy to a deformation of 70%; putting the deformed high-entropy alloy into a heat treatment furnace for heat treatment, wherein the temperature is 50% of the melting point of the NiCoCrFe high-entropy alloy, the annealing temperature is selected to be 575 ℃, and the heat treatment time is different from 5min to 300 min;
s2, preparing a metallographic sample, obtaining a thermally-treated high-entropy alloy scanning electron microscope picture, and counting the recrystallized volume fraction at different times at 575 ℃ (specifically, the scanning electron microscope picture is subjected to grid division, and the number of grid points occupied by recrystallized grains and the number of total grid points are respectively counted, and the ratio of the number of grid points occupied by the recrystallized grains to the number of total grid points is counted);
s3, fitting the statistical recrystallization volume fraction with the corresponding heat treatment time by using a JMAK model to obtain a recrystallization kinetic curve, wherein the recrystallization kinetic curve is shown in a figure 2 (a);
s4, regulating and controlling the heat treatment time according to the recrystallization kinetic curve, and obtaining the non-uniform structure of the target recrystallization volume fraction of the NiCoCrFe high-entropy alloy at the temperature of 575 ℃.
Example 2
The steps of the method for regulating the non-uniform structure of the high-entropy alloy are the same as those of the embodiment 1, except that the annealing temperature is 600 ℃, and the recrystallization kinetic curve is shown in figure 2 (a).
Example 3
A method for regulating the non-uniform structure of a high-entropy alloy comprises the same steps as those of example 1, except that the annealing temperature is 650 ℃, and a recrystallization kinetic curve is shown in figure 2 (a).
Example 4
The method for regulating the non-uniform structure of the high-entropy alloy comprises the same steps as example 1, and is characterized in that the high-entropy alloy is Ni2CoCrFe, recrystallization kinetics, as shown in FIG. 2 (b).
Example 5
The steps of the method for regulating the non-uniform structure of the high-entropy alloy are the same as those of the embodiment 4, except that the annealing temperature is 600 ℃, and the recrystallization kinetic curve is shown in figure 2 (b).
Example 6
A method for regulating the non-uniform structure of a high-entropy alloy comprises the same steps as those of example 4, except that the annealing temperature is 650 ℃, and a recrystallization kinetic curve is shown in FIG. 2 (b).
Example 7
The method for regulating the non-uniform structure of the high-entropy alloy is the same as that in example 4, except that the cold rolling is carried out until the deformation is 50%.
Example 8
The method for regulating the non-uniform structure of the high-entropy alloy is the same as that in example 4, except that the cold rolling is carried out until the deformation is 90%.
Taking the high-entropy alloy with the heat treatment time of 35min in example 5 as an example to illustrate the statistical method of the recrystallized product fraction, as shown in fig. 1, firstly, the tissue to be subjected to statistical recrystallization product fraction is subjected to grid division (11 × 15), and the number of grid points corresponding to the statistical recrystallization grains is 56, so that the recrystallization product fraction of the tissue is 33.9%; the statistical methods of the recrystallized volume fraction of the high-entropy alloy under the other heat treatment conditions are the same.
FIG. 2 is a graph of recrystallization kinetics of the high-entropy alloy after heat treatment in examples 1 to 6, which can be obtained from FIG. 2, and by corresponding the counted volume fraction of recrystallization of the alloy to the heat treatment time and fitting the calculated volume fraction with a JMAK model, a recrystallization kinetics curve and an equation thereof at a given temperature of the alloy, NiCoCrFe (a) and Ni, are obtained2Graph of recrystallization kinetics for CoCrFe (b) -575 deg.C/600 deg.C/650 deg.C.
NiCoCrFe and Ni, for example at 600 deg.C2The recrystallization kinetic equations of CoCrFe at 600 ℃ are respectively:
Figure BDA0002728719150000051
and
Figure BDA0002728719150000052
x is the recrystallization volume fraction and t is the heat treatment time.
In order to verify the accuracy of guiding the acquisition of the target heterogeneous structure by drawing a high-entropy alloy recrystallization kinetic curve by the method, NiCoCrFe and Ni are used2The recrystallization kinetics of the CoCrFe alloy at 600 ℃ is taken as a basis, and prediction and experimental verification are carried out (as shown in figure 3). From FIG. 3, it can be obtained that (a) NiCoCrFe: predicting the target recrystallization volume fraction to be 50%, substituting the predicted target recrystallization volume fraction into an equation to calculate the corresponding heat treatment time to be 23min, and counting the recrystallization volume fraction of the obtained high-entropy alloy through an EBSD picture after the heat treatment condition treatment to obtain the actual recrystallization volume fraction of 57%, which is 7% different from the predicted recrystallization volume fraction；(b)Ni2CoCrFe: the predicted recrystallization volume fraction is 25%, the corresponding heat treatment time is calculated by substituting the predicted recrystallization volume fraction into an equation to be 26min, the recrystallization volume fraction is counted by an EBSD picture, the actual recrystallization volume fraction is 22%, and the difference is 3% from the predicted recrystallization volume fraction. Therefore, the method can guide the target inhomogeneous tissue to be obtained in the high-entropy alloy according to the high-entropy alloy recrystallization dynamics rule, the error between the predicted inhomogeneous tissue and the actual volume fraction is small (the error is within 7 percent), the result is accurate, and the method is suitable for popularization and application; the method of the invention firstly draws a high-entropy alloy recrystallization dynamics curve, namely a quantitative relation between the heat treatment parameters of the high-entropy alloy and the integral number of the recrystallization body of the non-uniform structure.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that such changes and modifications be included within the scope of the appended claims and their equivalents.

Claims (6)

1. A method for regulating and controlling a non-uniform structure of a high-entropy alloy is characterized by comprising the following steps of:
s1, cold rolling the high-entropy alloy; respectively carrying out heat treatment on the cold-rolled high-entropy alloy at a set temperature for different times to obtain multiple groups of high-entropy alloys in different heat treatment states; the set temperature is 40% -70% of the melting point of the high-entropy alloy;
s2, respectively counting the recrystallization volume fraction of the high-entropy alloy in S1 different heat treatment states;
s3, carrying out parameter fitting of a JMAK model on the recrystallized volume fraction counted in the S2 and the corresponding heat treatment time to obtain a recrystallization kinetic rule of the high-entropy alloy at the set temperature;
the recrystallization kinetics law can be represented by formula (I):
X＝1—exp(-Btn)
(Ⅰ)
wherein B and n are constants, X is the recrystallization volume fraction, and t is the heat treatment time;
and S4, regulating and controlling the heat treatment time according to the S3 recrystallization kinetic rule, and obtaining the target recrystallization volume fraction of the non-uniform tissue.
2. A regulation and control method of a non-uniform structure of a high-entropy alloy as claimed in claim 1, wherein in S1, the deformation amount of the cold rolling treatment is 50% -90%.
3. A regulation and control method of a non-uniform structure of a high-entropy alloy as claimed in claim 1, wherein in S1, the time of the heat treatment is in the range of 5-300 min.
4. A regulation and control method of a non-uniform structure of a high-entropy alloy as claimed in claim 1, wherein in S2, the statistical method of the recrystallization volume fraction is specifically as follows:
acquiring a high-entropy alloy scanning electron microscope picture after heat treatment; and carrying out grid division on the scanning electron microscope picture, respectively counting the number of grid points occupied by the recrystallized grains and the number of total grid points, and obtaining the ratio of the number of grid points occupied by the recrystallized grains to the number of total grid points, namely the recrystallized volume fraction of the high-entropy alloy.
5. A regulation and control method of high-entropy alloy nonuniform structure as claimed in claim 1, characterized in that the high-entropy alloy is a single-phase FCC high-entropy alloy.
6. A regulation and control method of high-entropy alloy nonuniform structure according to claim 5, characterized in that the high-entropy alloy is NiCoCrFe or Ni2CoCrFe。
CN202011111417.7A 2020-10-16 2020-10-16 Method for regulating and controlling non-uniform structure of high-entropy alloy Pending CN112210731A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017098848A1 (en) * 2015-12-10 2017-06-15 株式会社日立製作所 High entropy alloy member, method for producing alloy member, and product using alloy member
CN110068507A (en) * 2018-01-22 2019-07-30 中国科学院金属研究所 The method that a kind of pair of tradition recrystallization model is modified
CN110643911A (en) * 2019-10-25 2020-01-03 西北工业大学 Thermal mechanical treatment method of eutectic high-entropy alloy
CN110923538A (en) * 2019-12-12 2020-03-27 燕山大学 High-entropy alloy with multidirectional annealing twin crystals and preparation method thereof
CN111455198A (en) * 2020-05-15 2020-07-28 上海大学 Preparation method of HfNbTiZr alloy sample suitable for anti-fatigue experiment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017098848A1 (en) * 2015-12-10 2017-06-15 株式会社日立製作所 High entropy alloy member, method for producing alloy member, and product using alloy member
CN110068507A (en) * 2018-01-22 2019-07-30 中国科学院金属研究所 The method that a kind of pair of tradition recrystallization model is modified
CN110643911A (en) * 2019-10-25 2020-01-03 西北工业大学 Thermal mechanical treatment method of eutectic high-entropy alloy
CN110923538A (en) * 2019-12-12 2020-03-27 燕山大学 High-entropy alloy with multidirectional annealing twin crystals and preparation method thereof
CN111455198A (en) * 2020-05-15 2020-07-28 上海大学 Preparation method of HfNbTiZr alloy sample suitable for anti-fatigue experiment

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
曹承明: "FeMnCrCo系双相高熵合金力学性能与变形机理研究", 《中国博士学位论文库全文数据库 工程科技Ⅰ辑》 *
曹育菡 等: "CoCrFeNiMo0.2高熵合金的不完全再结晶组织与力学性能", 《金属学报》 *
轧制技术及连轧自动化国家重点实验室（东北大学）: "《奥氏体-铁素体相变动机学研究》", 30 September 2015, 冶金工业出版社 *

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