Iron-containing damping alloy design method and application based on entropy regulation and control

Abstract

The invention belongs to the technical field of damping alloys, and particularly relates to an iron-containing damping alloy component design method based on entropy regulation and control. The invention discloses a design method of an iron-containing damping alloy based on entropy regulation and control. The design method comprises the following steps: selecting principal elements Fe, Cr, Mn, Co, Ni, Ti, Cu, Al, Mo and RE; the element molar content of Fe-Cr-Ni-X is used as a variable, X is one or more elements except Fe, Cr and Ni, the mixed entropy () and the valence electron concentration (VEC) of the alloy are calculated, and when R of the alloy is larger than or equal to 1.25, and VEC is larger than or equal to 7.15 and smaller than or equal to 7.95, the damping performance Q-1 of the alloy is larger than or equal to 0.02. According to the design method of the high-entropy damping alloy, the types and the content of elements in the alloy are adjusted according to the entropy value and the valence electron concentration of the alloy, and therefore the iron-containing high-entropy damping alloy with the high damping performance is obtained. And the component design efficiency of the iron-containing high-entropy damping alloy is improved, and the alloy development period is shortened.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of damping alloys, and particularly provides a design method and application of an iron-containing damping alloy based on entropy regulation. BACKGROUND

[0002] Ye Wubin formally proposed the concept of high-entropy alloy at the beginning of this century and gave the definition based on configurational entropy. According to the configurational entropy of the alloy, it can be divided into high-entropy alloy, medium-entropy alloy and low-entropy alloy. In the early stage of the development of high-entropy alloy, researchers are committed to finding single-phase solid solution alloys with high mixing entropy. Although studies have shown that most high-entropy alloys are composed of multiple phases rather than ideal solid solutions, and the entropy will change with temperature, the term "high-entropy alloy" has not been abandoned in the academic community. The concept of high-entropy alloy provides a new idea for alloy design philosophy, greatly expanding the composition space of alloy design, and at the same time, discovering many high-entropy alloys with unique physical properties and mechanical properties. It is also based on the emphasis on the performance of the material that in recent years some new alloys with excellent performance and complex composition but not meeting the definition of high-entropy alloy have also been named high-entropy alloy, and the academic community has not objected to this. From this point of view, "high-entropy alloy" will become a synonym for new alloys with excellent performance developed from multi-principal element alloys.

[0003] In modern industry and high-tech, controlling mechanical resonance and the noise generated thereby is one of the themes of industrial development. Because mechanical resonance reduces the service life and working reliability, and noise directly affects the performance indicators of equipment and produces environmental pollution. At present, there are three main ways to solve the problem of noise and vibration, one is to improve the structure of mechanical components, to design the components large and strong enough to reduce the amplitude by enlarging the size of the structure. The second is to add damping devices such as damping springs and dampers to the vibration source to dissipate the vibration before it propagates. The third is to directly use damping materials with high damping performance to manufacture mechanical structure components, and to convert the vibration energy of the system into heat energy to dissipate it. This method can fundamentally reduce the noise and vibration generated on the mechanical components, does not require additional devices, has the advantages of simplicity, good effect and wide range of application. The damping performance Q of general commonly used metal materials, i.e. aluminum alloy, copper alloy, titanium alloy and steel, is very low, and its damping performance Q -1 is less than 0.01. Some special metal materials, such as Mg, Fe, Ni, and alloys such as Zn-Al, Mg-Zr, Mn-Cu, Fe-Cr and high-entropy alloys, have damping performance Q -1 much greater than 0.01, and have become the ideal functional materials for various mechanical equipment and high-precision instruments due to their vibration reduction and noise reduction characteristics.

[0004] In recent years, some scholars have found that some high-entropy alloys have excellent damping performance, usually involving Fe, Cr, Mn, Ni, Ti, Co and Al elements, but often based on traditional trial and error method for design and preparation, there are long cycle, high cost problems. At present, there is lack of effective alloy design method to predict and control the damping performance of the alloy. Therefore, developing a high-entropy alloy design method based on empirical parameters can accurately control the phase composition of the alloy, so as to design the damping performance of the alloy according to the actual service environment, improve the design efficiency of the damping alloy, promote the application of high-entropy alloy in practical engineering field, and has important academic value and social benefits. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a design method based on iron-containing high-entropy damping alloy, to solve the problems of low efficiency and large workload of the existing iron-containing high-entropy damping alloy design method.

[0006] The purpose of the present application is: the present application combines alloy entropy value, valence electron concentration and ferromagnetic type damping, dislocation type damping mechanism. Through the calculation of the entropy value and valence electron concentration of the iron-containing damping alloy, the composition range of the alloy element is selected.

[0007] To achieve the above purpose, the present application provides the following technical scheme: A design method of iron-containing damping alloy based on entropy regulation: A design method of iron-containing damping alloy based on entropy regulation: comprising the following steps: Step (1) according to the damping mechanism, selecting main element Fe and Cr, Mn, Co, Ni, Ti, Cu, Al, Mo, V and RE. Taking the element mole content of Fe-Cr-Ni-X as a variable, wherein X is selected from one or more of Mn, Co, Ti, Cu, Al, Mo, V, RE, calculating the mixing entropy (S) and valence electron concentration (VEC); )and valence electron concentration (VEC); Step (2) optimizing the composition range. ≥1.25R, 7.15≤VEC≤7.95; Step (3) for each iron-containing alloy composition ratio selected in step (2): prepare into ingot, cut damping performance test sample, anneal and polish the cut damping performance test sample, annealing temperature 750~1100℃, annealing time 0.5~2h; the damping performance test method is double cantilever method, the double cantilever method is room temperature test / 25℃ test, the test frequency is 1Hz; Step (4) damping performance test is carried out on the samples cut from the iron-containing alloys with different compositions.

[0008] Further, the preferred Range: 1.35R≤ ≤1.65R, preferred VEC range: 7.45≤VEC≤7.65, its damping performance Q -1 ≥0.035.

[0009] Further, the screened iron-containing damping alloy composition ratio has the organizational characteristics of FCC+BCC phase, and presents a lamellar or reticular structure. When the alloy needs to have high damping and plasticity, VEC≥7.5 and the volume fraction of FCC phase≥60%; when the alloy needs to have high damping and strength, VEC≤7.5 and the volume fraction of BCC phase≥60%.

[0010] Further, the screened iron-containing damping alloy composition ratio has the damping performance, and its mechanism is the combination of ferromagnetic damping and dislocation damping.

[0011] Further, in step (3), the entropy-regulated iron-containing damping alloy is prepared by vacuum melting; Step (3-1), preparing alloy raw materials according to the proportion of each element in the entropy-regulated iron-containing damping alloy; the purity of the alloy raw materials used is greater than or equal to 99.0wt%; Step (3-2), placing the alloy raw materials in a vacuum melting device for melting to obtain an alloy melt; Step (3-3), casting the alloy melt, and after casting is completed, air cooling to room temperature to obtain the entropy-regulated iron-containing damping alloy.

[0012] Further, Si can also be added to the alloy, and the molar fraction of Si is 0-5.0%.

[0013] Further, the RE element is selected from the lanthanide series, and the molar fraction is 0.1%-5%.

[0014] The application of the iron-containing damping alloy obtained by the entropy-regulated iron-containing damping alloy design method as a vibration and noise reduction material for various mechanical equipment and high-precision instruments.

[0015] When selecting the composition elements of the high-entropy solid solution alloy, referring to the existing experience, according to the required performance of the high-entropy alloy, using the “cocktail effect” according to the performance superposition or complementation of the elements and the entropy regulation and valence electron concentration design idea proposed in the present patent, a high-entropy alloy with good damping performance can be designed. The following is the influence of some elements on the organization and performance of the high-entropy alloy: (1) Fe element, promoting the formation of BCC, having ferromagnetism, mainly distributed in the matrix. In addition, Fe is low in price, which is conducive to controlling the cost of the alloy; (2) Ti element, large atomic size, Ti can increase the degree of lattice distortion after being added, improve the hardness and strength of the alloy, and promote the formation of BCC structure; (3) V element, can promote the formation of BCC structure, can form uniformly distributed nano particles in the dendritic zone, promote the continuous refinement of alloy organization, the hardness and strength of the alloy gradually increase, but the plasticity decreases; (4) Cr element, promote the formation of BCC phase solid solution in the alloy, in terms of performance, too much Cr may reduce the strength and hardness of the alloy; (5) Mo element, its atomic size is large, after adding to the alloy, it will cause large lattice distortion, further improve the solid solution strengthening effect; (6) Mn element, promote the formation of FCC structure, may reduce the oxidation resistance of the alloy; (7) Co element, has ferromagnetism, promotes the formation of FCC phase solid solution structure in the alloy. A small amount of addition can improve the plasticity and wear resistance of the alloy; (8) Ni element, makes the alloy exhibit typical paramagnetism, is beneficial to the formation of FCC phase solid solution structure in the alloy; (9) Cu element, is beneficial to the formation of FCC phase solid solution structure in the alloy, is enriched in the intergranular region, and is often precipitated in the form of Cu-rich nano phase particles; (10) Al element, with the increase of the content of Al element in the alloy, the phase structure of the alloy changes from FCC phase to BCC phase, the organization morphology may change from cellular crystal to dendrite, the microhardness of the alloy increases, and the wear resistance also increases; (11) RE is the general term of seventeen metal elements in the periodic table of elements, lanthanide series and scandium and yttrium, which is added to the alloy. Because the atomic radius difference with the main element is large, it can make a large positive change in the microstructure of the alloy; (12) Si element, appropriate addition can increase the strength and melt flowability of the alloy.

[0016] The design concept of the application is as follows: Combined with the material characteristics of ferromagnetic damping alloy and dislocation type damping alloy, the design concept of high-entropy alloy is adopted, the element performance superposition of "cocktail effect" and the idea of entropy regulation and valence electron concentration range presetting proposed in the patent are used, the matrix phase of the damping alloy is regulated to be FCC+BCC phase, the organization is lamellar or reticular structure, through the play of FCC structure dislocation type damping effect and BCC structure ferromagnetic type damping effect, the high-entropy alloy with good damping performance can be designed.

[0017] The mixing entropy of the alloy is calculated and defined as: Wherein, S is the mixing entropy of the designed alloy, C i X is the mole fraction of each element, R R is the gas constant.

[0018] The alloy valence electron concentration value is defined as: Wherein, VEC i The valence electron concentration value of each element.

[0019] The valence electron concentration values of Fe, Cr and Ni are 8, 6 and 10 respectively. In order to guide the performance of the designed alloy, the content of the elements in the alloy is adjusted to design the corresponding alloy organization. For example, when the service environment requires high damping performance and high plasticity and toughness of the alloy, a high volume fraction of FCC phase is required in the alloy, so the valence electron concentration value of the designed alloy needs to be greater than 7.5; that is, the content of alloy elements with a valence electron concentration greater than 8, such as Ni, Co and Cu, needs to be appropriately increased. For another example, when the service environment requires high damping performance and high strength of the alloy, the BCC phase in the alloy needs to be increased to improve the strength of the alloy, that is, the ferromagnetic damping needs to be fully utilized, so the valence electron concentration value of the designed alloy needs to be less than 7.5, that is, the content of alloy elements with a valence electron concentration less than 7, such as Cr, Al, Ti, V and RE, needs to be appropriately increased.

[0020] The advantages and beneficial effects of the present application are: 1. The design method of the iron-containing damping alloy based on entropy regulation according to the present application can be used to design the composition of the iron-containing damping alloy according to the mixing entropy and the valence electron concentration. The alloy composition is adjusted through the correlation between the mixing entropy, the valence electron concentration and the ferromagnetic damping and the dislocation damping, thereby improving the design efficiency of the alloy and avoiding the problems of high cost and long cycle caused by the traditional trial-and-error method.

[0021] 2. The iron-containing damping alloy designed by the method according to the present application has good damping performance and can be used as a vibration and noise reduction material for various mechanical equipment and high-precision instruments.

[0022] 3. The high-entropy alloy designed by the method according to the present application has good casting performance, and the alloy directly cast into shape has good damping performance and good strength and plasticity matching ability, thereby further promoting the application of high-entropy alloy in the actual engineering field. DETAILED DESCRIPTION

[0023] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application, and do not constitute an improper limitation of the present application. In the drawings: Figure 1 The schematic diagram of the lamellar metallographic structure proposed by the present application; Figure 2 The schematic diagram of the network structure metallographic structure proposed by the present application; Figure 3The DMA test results of the iron-containing damping alloy proposed in Example 1 are shown in the following figure: Figure 4 The DMA test results of the iron-containing damping alloy proposed in Example 2 are shown in the following figure: Figure 5 The DMA test results of the iron-containing damping alloy proposed in Example 3 are shown in the following figure: Figure 6 The DMA test results of the iron-containing damping alloy proposed in Example 4 are shown in the following figure: Figure 7 The DMA test results of the iron-containing damping alloy proposed in Example 5 are shown in the following figure: Figure 8 The DMA test results of the iron-containing damping alloy proposed in Example 6 are shown in the following figure: Figure 9 The DMA test results of the iron-containing damping alloy proposed in Comparative Example 1 are shown in the following figure. DETAILED DESCRIPTION

[0024] The preparation method of the present application is described in detail below, and the examples are only used to explain the present application and not to limit the scope of the present application. The parts of the present application are by weight.

[0025] The features and properties of the present application are further described in detail below in combination with examples. The schematic diagram of the lamellar metallographic structure proposed in the present application is shown in Figure 1 ; and the schematic diagram of the network structure metallographic structure proposed in the present application is shown in Figure 2 .

[0026] Example 1: Fe3Cr2NiCuAl 0.35 This embodiment is based on the design method of the entropy-regulated iron-containing damping alloy, which comprises the following steps: Step (1) According to the damping mechanism, the main elements Fe, Cr, Ni, Cu and Al are selected; Step (2) The composition range is optimized. So that its ≥1.25R, 7.15≤VEC≤7.95. The chemical formula of the final determined composition example alloy is Fe3Cr2NiCuAl 0.35 , and the nominal composition (at%) ratio is Fe: 40.82%, Cr: 27.21%, Ni: 13.60%, Cu: 13.60%, Al: 4.76%. Its VEC is 7.90, is 1.4077R; Step (3) according to the component ratio of the iron-containing damping alloy designed in step (2), prepare alloy ingot, cut damping performance test sample. The cut damping performance test sample is annealed at 850℃ for 1h and polished. The damping performance test method is double cantilever method (test at room temperature / test at 25℃, test frequency is 1Hz); Step (3-1) prepare alloy raw materials according to the proportion of each element in the entropy regulation based iron-containing damping alloy; the purity of the alloy raw materials used is greater than or equal to 99.0wt%; Step (3-2) melt the alloy raw materials in a vacuum melting device to obtain an alloy melt; Step (3-3) cast the alloy melt, and after casting is completed, naturally cool to room temperature to obtain the entropy regulation based iron-containing damping alloy; Step (4) test the damping performance of the alloy cut sample. Obtain the damping performance curve of the alloy; As Figure 3 shown, the damping performance of the Fe3Cr2NiCuAl 0.35 alloy in Example 1 is shown in the figure, the maximum damping performance is 0.032, and the damping performance is 0.02 -1 <0.035.

[0027] Example 2: Fe4Mn2Cr 1.5 Co2Ti 0.5 The design method of the entropy regulation based iron-containing damping alloy in this example includes the following steps: Step (1) according to the damping mechanism, select the main element Fe, Mn, Cr, Co, Ti; Step (2) optimize the composition range. Make it ≥1.25R, 7.15≤VEC≤7.95. The chemical formula of the final composition example alloy is Fe4Mn2Cr 1.5 Co2Ti 0.5 , the nominal composition (at%) ratio is Fe40%, Cr15%, Co20%, Mn20%, Ti5%. The VEC is 7.50, 1.4446R; Step (3) according to the component ratio of the iron-containing damping alloy designed in step (2), prepare alloy ingot, cut damping performance test sample. The cut damping performance test sample is annealed at 850℃ for 1h and polished. The damping performance test method is double cantilever method (test at room temperature / test at 25℃, test frequency is 1Hz); Step (3-1) Prepare alloy raw materials according to the proportion of each element in the entropy-controlled iron-containing damping alloy; the purity of all alloy raw materials used is greater than or equal to 99.0 wt%; Step (3-2) involves placing the alloy raw materials in a vacuum melting equipment for melting to obtain the alloy melt; Step (3-3) involves casting the alloy melt and allowing it to cool naturally to room temperature after casting to obtain an iron-containing damping alloy based on entropy regulation. Step (4) Perform damping performance tests on the alloy samples. Obtain the damping performance curve of the alloy; like Figure 4 As shown, in Example 2, Fe4Mn2Cr 1.5 Co2Ti 0.5 The damping performance diagram of the alloy shows that its maximum damping performance is 0.066, and its damping performance is greater than 0.035.

[0028] Example 3: Al 0.5 CrFe3NiMo 0.2 This embodiment is based on the design method of entropy-controlled iron-containing damping alloys, including the following steps: Step (1) Based on the damping mechanism, select the main element Fe, Cr, Ni, Al, and Mo; Step (2) Optimize the component range. This makes it... ≥1.25R, 7.15≤VEC≤7.95. The final chemical formula of the alloy in the composition example is Al. 0.5 CrFe3NiMo 0.2 The nominal composition (at%) is Fe 52.63%, Cr 17.54%, Ni 17.54%, Al 8.77%, and Mo 3.51%. Its VEC is 7.49. It is 1.2795R; Step (3) Prepare the alloy ingot according to the iron-containing damping alloy composition ratio designed in Step (2), and cut out damping performance test samples. Anneal the cut damping performance test samples at 850℃ for 1 hour and then polish them. The damping performance test method is the double cantilever method (tested at room temperature / tested at 25℃, test frequency 1Hz). Step (3-1) Prepare alloy raw materials according to the proportion of each element in the entropy-controlled iron-containing damping alloy; the purity of all alloy raw materials used is greater than or equal to 99.0 wt%; Step (3-2) involves placing the alloy raw materials in a vacuum melting equipment for melting to obtain the alloy melt; Step (3-3) involves casting the alloy melt and allowing it to cool naturally to room temperature after casting to obtain an iron-containing damping alloy based on entropy regulation. Step (4) The damping performance of the alloy sample is tested. The damping performance curve of the alloy is obtained; As shown in Figure 5 Figure 5, the damping performance of the Al 0.5 CrFe3NiMo 0.2 alloy is shown in the figure, and the maximum damping performance is 0.042, and the damping performance is > 0.035.

[0029] Example 4: CoCrFeMnNiV 0.5 This embodiment is based on the design method of the entropy-regulated iron-containing damping alloy, which comprises the following steps: Step (1) According to the damping mechanism, the main elements Fe, Cr, Ni, Mn, Co, and V are selected; Step (2) Optimize the composition range. Make it ≥1.25R, 7.15≤VEC≤7.95. The chemical formula of the final composition example alloy is CoCrFeMnNiV 0.5 , and the nominal composition (at%) ratio is Fe 18.18%, Cr 18.18%, Ni 18.18%, Mn 18.18%, Co 18.18%, and V 9.09%. The VEC is 7.73, 1.7678R; Step (3) The alloy ingot is prepared according to the composition ratio of the iron-containing damping alloy designed in step (2), and the damping performance test sample is cut. The cut damping performance test sample is annealed at 900℃ for 1h and polished. The damping performance test method is the double cantilever method (room temperature test / 25℃ test, test frequency is 1Hz); Step (3-1) Prepare alloy raw materials according to the proportion of each element in the entropy-regulated iron-containing damping alloy; the purity of the alloy raw materials used is greater than or equal to 99.0wt%; Step (3-2) Put the alloy raw materials into a vacuum melting device for melting to obtain an alloy melt; Step (3-3) The alloy melt is cast, and after casting is completed, it is naturally cooled to room temperature to obtain the entropy-regulated iron-containing damping alloy; Step (4) The damping performance of the alloy sample is tested. The damping performance curve of the alloy is obtained; As shown in Figure 6 Figure 4, the damping performance of the CoCrFeMnNiV 0.5 alloy in Example 4 is shown in the figure, and the maximum damping performance is 0.030, and the damping performance is: 0.02 -1 < 0.035.

[0030] Example 5: Fe 3.4 Cr3.3 Ni 1.5 Co 1.5 Gd 0.3 The embodiment is based on the design method of entropy-regulated iron-containing damping alloy, comprising the following steps: Step (1) According to the damping mechanism, the main element Fe, Cr, Ni, Co, and Gd are selected; Step (2) The composition range is optimized. So that ≥1.25R, 7.15≤VEC≤7.95. The chemical formula of the final composition embodiment alloy is Fe 3.4 Cr 3.3 Ni 1.5 Co 1.5 Gd 0.3 , the nominal composition (at%) ratio is Fe 34%, Cr 33%, Ni 15%, Co 15%, and Gd 3%. The VEC is 7.85, is 1.4070R; Step (3) The alloy ingot is prepared according to the composition ratio of the iron-containing damping alloy designed in step (2), and the damping performance test sample is cut. The cut damping performance test sample is annealed at 900℃ for 1h and polished. The damping performance test method is the double cantilever method (room temperature test / 25℃ test, test frequency is 1Hz); Step (3-1) Prepare alloy raw materials according to the proportion of each element in the entropy-regulated iron-containing damping alloy; the purity of the alloy raw materials used is greater than or equal to 99.0wt%; Step (3-2) Put the alloy raw materials into a vacuum melting equipment for melting to obtain an alloy melt; Step (3-3) The alloy melt is cast, and after casting is completed, it is naturally cooled to room temperature to obtain an entropy-regulated iron-containing damping alloy; Step (4) The damping performance of the alloy sample is tested. The damping performance curve of the alloy is obtained; As Figure 7 shown in Example 5, the damping performance of the Fe 3.4 Cr 3.3 Ni 1.5 Co 1.5 Gd 0.3 alloy is shown in the figure, and the maximum damping performance is 0.034, and the damping performance is 0.02 -1 <0.035.

[0031] Example 6: Fe4Mn2Cr 1.3 Co2Ti 0.5 Si 0.2 The embodiment is based on the design method of the entropy-regulated iron-containing damping alloy, and comprises the following steps: Step (1) according to the damping mechanism, selecting main element elements Fe, Mn, Cr, Co, Ti; selecting adding Si element to improve the alloy casting performance; Step (2) optimizing the component range, so that ≥1.25R, 7.15≤VEC≤7.95. The chemical formula of the final determined component embodiment alloy is Fe4Mn2Cr 1.5 Co2Ti 0.5 , and the nominal component (at%) ratio is Fe40%, Cr13%, Co20%, Mn20%, Ti5%, Si2%. The VEC is 7.46, 1.5035R; Step (3) preparing alloy raw materials according to the component ratio of the iron-containing damping alloy designed in step (2), preparing alloy ingots, and cutting damping performance test samples. The cut damping performance test samples are subjected to annealing treatment at 850℃ for 1h and polishing treatment. The damping performance test method is the double cantilever method (room temperature test / 25℃ test, test frequency is 1Hz); Step (3-1) preparing alloy raw materials according to the proportion of each element in the entropy-regulated iron-containing damping alloy; the purity of the alloy raw materials used is greater than or equal to 99.0wt%; Step (3-2) placing the alloy raw materials in a vacuum melting equipment to carry out melting, and obtaining an alloy melt; Step (3-3) casting the alloy melt, and naturally cooling to room temperature after casting is completed, to obtain the entropy-regulated iron-containing damping alloy; Compared with Example 2, after adding 2% of Si, the alloy melting point decreases from about 1100℃ to about 900℃. The addition of Si improves the casting performance of the alloy.

[0032] Step (4) testing the damping performance of the cut alloy sample. The damping performance curve of the alloy is obtained; As Figure 8 shown in the damping performance curve of the Fe4Mn2Cr 1.3 Co2Ti 0.5 Si 0.2 alloy in Example 2, the maximum damping performance is 0.044, and the damping performance is greater than 0.035.

[0033] Comparative Example 1: Fe2CrNiAl 0.5 Ti 0.5 The embodiment is based on the design method of the entropy-regulated iron-containing damping alloy, and comprises the following steps: Step (1) according to the damping mechanism, selecting main element elements Fe, Mn, Cr, Co, Ti; Step (2) determines the chemical formula of the component example alloy as Fe2CrNiAl 0.5 Ti 0.5 The nominal component (at%) ratio is Fe: 40%, Cr: 20%, Ni: 20%, Al: 10%, Ti: 10%. The VEC is 7.10, is 1.4708R; Step (3) prepares the alloy ingot according to the component ratio of the iron-containing damping alloy designed in step (2), and cuts the damping performance test sample. The cut damping performance test sample is subjected to annealing treatment at 900℃ for 1h and polishing treatment. The damping performance test method is the double cantilever method (room temperature test / 25℃ test, test frequency is 1Hz); Step (3-1) prepares alloy raw materials according to the proportion of each element in the iron-containing damping alloy based on entropy regulation; the purity of the alloy raw materials used is greater than or equal to 99.0wt%; Step (3-2) places the alloy raw materials in a vacuum melting device for melting to obtain an alloy melt; Step (3-3) casts the alloy melt, and after casting is completed, it is naturally cooled to room temperature to obtain an iron-containing damping alloy based on entropy regulation; Step (4) tests the damping performance of the alloy cut sample. The damping performance curve of the alloy is obtained; As Figure 9 shown in the comparative example Fe2CrNiAl 0.5 Ti 0.5 The damping performance of the alloy is shown in the figure, and the maximum damping performance is 0.013, and the damping performance is <0.02.

[0034] The present application is not limited to the foregoing specific embodiments. The present application extends to any novel one, or any new combination, of the characteristics disclosed in this specification, and to any novel method or process, or any new combination, disclosed.

[0035] The details of the present application are known.

[0036] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A design method for iron-containing damping alloys based on entropy regulation: characterized in that, Includes the following steps: Step (1) Based on the damping mechanism, select the principal element Fe, as well as Cr, Mn, Co, Ni, Ti, Cu, Al, Mo, V, and RE. Using the molar content of Fe-Cr-Ni-X as the variable, where X is selected from one or more of Mn, Co, Ti, Cu, Al, Mo, V, and RE, calculate the mixing entropy (…). ) and valence electron concentration (VEC); Step (2) Optimize the component range. ≥1.25R, 7.15≤VEC≤7.95; Step (3) For each iron-containing alloy composition selected in step (2): prepare it into an ingot, cut out a damping performance test sample, and anneal and polish the cut damping performance test sample. The annealing temperature is 750~1100℃ and the annealing time is 0.5~2h. The damping performance test method is the double cantilever method, which is tested at room temperature / 25℃, and the test frequency is 1Hz. Step (4) Damping performance tests are performed on samples cut from iron-containing alloys with different compositions.

2. The design method for iron-containing damping alloys based on entropy regulation according to claim 1, characterized in that, Preferred Range: 1.35R≤ ≤1.65R, preferred VEC range: 7.45≤VEC≤7.65, its damping performance Q -1 ≥0.

035.

3. The design method for iron-containing damping alloys based on entropy regulation according to claim 1, characterized in that, The selected iron-containing damping alloy composition has an FCC+BCC phase microstructure, exhibiting a lamellar or network structure. When the alloy requires both high damping and ductility, VEC ≥ 7.5 and the volume fraction of the FCC phase ≥ 60%; when the alloy requires both high damping and strength, VEC ≤ 7.5 and the volume fraction of the BCC phase ≥ 60%.

4. The design method for iron-containing damping alloys based on entropy regulation according to claim 1, characterized in that, The selected iron-containing damping alloy composition has damping properties, and its mechanism is a combination of ferromagnetic damping and dislocation damping.

5. The design method for iron-containing damping alloys based on entropy regulation according to claim 1, characterized in that, In step (3), the iron-containing damping alloy based on entropy regulation is prepared by vacuum melting; Step (3-1): Prepare alloy raw materials according to the proportion of each element in the entropy-controlled iron-containing damping alloy; the purity of all alloy raw materials used is greater than or equal to 99.0 wt%. Step (3-2): Place the alloy raw materials in a vacuum melting equipment for melting to obtain the alloy melt; Step (3-3): Cast the alloy melt and air-cool it to room temperature after casting to obtain an iron-containing damping alloy based on entropy control.

6. The design method for iron-containing damping alloys based on entropy regulation according to claim 1, characterized in that, Si can also be added to the alloy, with a Si content in the range of 0 to 5.0% molar fraction.

7. The design method for iron-containing damping alloys based on entropy regulation according to claim 1, characterized in that: The added RE element is selected from the lanthanides, and its mole fraction is 0.1% to 5%.

8. An application of an iron-containing damping alloy obtained by any of the entropy-controlled iron-containing damping alloy design methods according to claims 1 to 7, characterized in that: As a vibration reduction and noise reduction material for various mechanical equipment and high-precision instruments.

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