CN110423934B - High-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with large magnetocaloric effect, and preparation method and application thereof - Google Patents

High-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with large magnetocaloric effect, and preparation method and application thereof Download PDF

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CN110423934B
CN110423934B CN201910798078.5A CN201910798078A CN110423934B CN 110423934 B CN110423934 B CN 110423934B CN 201910798078 A CN201910798078 A CN 201910798078A CN 110423934 B CN110423934 B CN 110423934B
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张琨
谭昌龙
田晓华
赵文彬
黄跃武
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Harbin University of Science and Technology
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Abstract

The invention belongs to the technical field of magnetic materials, and particularly relates to a high-temperature high-toughness high-magnetocaloric-effect Ni-Co-Mn-Sn-Cu alloy, a preparation method and an application thereof. The invention aims to solve the problems that the existing Ni-Mn-Sn ferromagnetic shape memory alloy system has large brittleness and is difficult to meet the use at higher environmental temperature. Has a chemical formula of Ni48‑xCoxMn37Sn9Cu6Wherein x is a mole fraction, 0 < x ≦ 12 and the sum of the moles of elements in the alloy is 100. The method comprises the following steps: firstly, preparing materials; secondly, arc melting; thirdly, homogenizing to finally obtain Ni48‑xCoxMn37Sn9Cu6Magnetic refrigeration alloy material.

Description

High-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with large magnetocaloric effect, and preparation method and application thereof
Technical Field
The invention belongs to the technical field of magnetic materials, and particularly relates to a high-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with a large magnetocaloric effect, a preparation method and application thereof.
Background
Efficient energy utilization and environmental protection have become the focus of global attention as the basis of sustainable development strategies in various countries. At present, the vapor compression refrigeration technology faces the challenges of replacing refrigerants and improving refrigeration efficiency. It is imperative to find alternative refrigeration technologies. In recent years, magnetic refrigeration has proven to be a promising environmentally friendly, energy efficient refrigeration technology. In the development process of the magnetic refrigeration technology, the Ni-Mn-Sn ferromagnetic shape memory alloy has direct magnetic field induced reverse martensite phase transformation (MFIRMT) and good magnetocaloric effect (MCE), and has wide application prospect in the field of high-efficiency solid refrigeration. In addition to the need to have a large MCE, good mechanical properties are another prerequisite so that it can be processed into the desired shape to improve the heat exchange performance while enabling a longer service life. However, the mechanical properties of the existing Ni-Mn-Sn based magnetic memory alloy are generally poor, and the development and the application of the existing Ni-Mn-Sn based magnetic memory alloy are severely restricted. In addition, the working temperature of the alloy is generally low, and the service condition under high environmental temperature is difficult to meet. So far, the existing Ni-Mn-Sn based magnetic refrigeration materials can not solve all the problems at the same time. Therefore, the development of a novel Ni-Mn-Sn based magnetic refrigeration material with huge MCE, higher working temperature and excellent mechanical property has important practical value.
Disclosure of Invention
The invention provides a high-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with a large magnetocaloric effect, a preparation method and application thereof, aiming at solving the problems of large brittleness and difficulty in meeting the use at higher ambient temperature of the existing Ni-Mn-Sn ferromagnetic shape memory alloy system.
The chemical general formula of the high-temperature high-toughness high-magnetocaloric-effect Ni-Co-Mn-Sn-Cu alloy is Ni48- xCoxMn37Sn9Cu6Wherein x is a mole fraction, 0 < x ≦ 12 and the sum of the moles of elements in the alloy is 100.
The second embodiment is as follows: the preparation method of the Ni-Co-Mn-Sn-Cu alloy with high temperature, high toughness and large magnetocaloric effect according to the embodiment is completed by the following steps:
firstly, preparing materials: according to the chemical formula of Ni48-xCoxMn37Sn9Cu6Proportioning, wherein x is a mole fraction, x is more than 0 and less than or equal to 12, the sum of the mole numbers of elements in the alloy is 100, and nickel blocks, manganese blocks, tin blocks, cobalt blocks and copper blocks are respectively weighed as raw materials;
secondly, placing the raw materials weighed in the step one in a melting crucible, and carrying out arc melting to obtain a Ni-Co-Mn-Sn-Cu button ingot;
thirdly, mechanically polishing the Ni-Co-Mn-Sn-Cu button cast ingot to remove surface impurities, and cleaning the cast ingot by using acetoneCleaning the substrate for 2-3 times with alcohol for 2-3 times and packaging the substrate in a vacuum degree of 10-3In a Pa quartz tube, keeping the temperature for 36-48 h at 1073K for homogenization treatment, and quenching into ice water to finally obtain Ni48-xCoxMn37Sn9Cu6Magnetic refrigeration alloy material.
The invention has the beneficial effects that:
1. the invention uses Ni48Mn37Sn15The method for Co-doping two elements is adopted as a basic alloy component, and finally, the working temperature and the mechanical property of the alloy material are synchronously and greatly improved in the Ni-Co-Mn-Sn-Cu alloy, and simultaneously, huge magnetic entropy change is obtained.
2. According to the invention, Co doping is utilized to obviously improve the Curie temperature of the Ni-Mn-Sn-based alloy, Cu doping is utilized to greatly improve the martensite phase transition temperature of the alloy, the working temperature of the alloy is moved to a high temperature direction, and the working temperature zone of the alloy is widened; meanwhile, Co and Cu are codoped to improve the saturation magnetization of the austenite phase of the alloy and improve the magnetocaloric property of the alloy; wherein, when x is 8, Ni is in 7T magnetic field40Co8Mn37Sn9Cu6The alloy obtains a giant magnetic entropy change of 34.8J/kg.K at 344K, so that the Ni-Co-Mn-Sn-Cu magnetic refrigeration alloy material can be used in a high-temperature environment and has a good refrigeration effect.
3. The addition of Co and Cu elements obviously improves the compressive fracture strength and the fracture strain of the Ni-Mn-Sn alloy, and the main reasons for the gas are as follows: the presence of the second phase particles hinders intergranular fracture of the alloy, the plasticity is significantly improved, and the fracture strain is increased so that the fracture strength of the alloy is also significantly improved. When x is 8, Ni40Co8Mn37Sn9Cu6The compressive fracture strength and the compressive strain of the alloy are respectively 1072.0MPa and 11.9 percent, and the invention has important theoretical significance and engineering application value for widening the practical application of the Ni-Mn-Sn ferromagnetic memory alloy.
4. The ferromagnetic shape memory alloy Ni with huge magnetocaloric effect provided by the invention40Co8Mn37Sn9Cu6DisplayingHas excellent comprehensive performance and is an ideal non-rare earth magnetic refrigeration candidate material. Meanwhile, the regulation and control means utilizing double doping in the patent has a general rule and is also suitable for all Ni-Mn-based magnetic memory alloys.
Drawings
FIG. 1 is a DSC curve of the magnetic refrigeration alloy material prepared in the first embodiment;
FIG. 2 is a DSC curve of the magnetic refrigeration alloy material prepared in the second embodiment;
FIG. 3 is a DSC curve of the magnetic refrigeration alloy material prepared in the third embodiment;
FIG. 4 is a thermomagnetic curve of the magnetic refrigeration alloy material prepared in the first to the fourth embodiments under a magnetic field of 100 Oe; wherein 1 is embodiment one, 2 is embodiment two, 3 is embodiment three, and 4 is embodiment four;
FIG. 5 is the isothermal magnetization curve of the magnetic refrigeration alloy material prepared in the third embodiment;
FIG. 6 is a magnetic entropy change curve of the magnetic refrigeration alloy material prepared in the third embodiment under different external magnetic fields; wherein 1 is 1.0T, 2 is 3.0T, 3 is 5.0T, and 4 is 7.0T;
FIG. 7 is a compressive fracture stress-strain curve at room temperature of magnetic refrigeration alloy materials prepared in examples one to five; wherein 1 is the first embodiment, 2 is the second embodiment, 3 is the third embodiment, 4 is the fourth embodiment, and 5 is the fifth embodiment.
Detailed Description
The technical solution of the present invention is not limited to the specific embodiments listed below, but includes any combination between the specific embodiments.
The first embodiment is as follows: the chemical general formula of the Ni-Co-Mn-Sn-Cu alloy with high temperature, high toughness and large magnetocaloric effect is Ni48-xCoxMn37Sn9Cu6Wherein x is a mole fraction, 0 < x ≦ 12 and the sum of the moles of elements in the alloy is 100.
The second embodiment is as follows: the preparation method of the Ni-Co-Mn-Sn-Cu alloy with high temperature, high toughness and large magnetocaloric effect according to the embodiment is completed by the following steps:
firstly, preparing materials: according to the chemical principle ofIs of the formula Ni48-xCoxMn37Sn9Cu6Proportioning, wherein x is a mole fraction, x is more than 0 and less than or equal to 12, the sum of the mole numbers of elements in the alloy is 100, and nickel blocks, manganese blocks, tin blocks, cobalt blocks and copper blocks are respectively weighed as raw materials;
secondly, placing the raw materials weighed in the step one in a melting crucible, and carrying out arc melting to obtain a Ni-Co-Mn-Sn-Cu button ingot;
thirdly, mechanically polishing the Ni-Co-Mn-Sn-Cu button cast ingot to remove surface impurities, cleaning the cast ingot with acetone for 2-3 times, cleaning the cast ingot with alcohol for 2-3 times, and packaging the cast ingot into a vacuum degree of 10-3In a Pa quartz tube, keeping the temperature for 36-48 h at 1073K for homogenization treatment, and quenching into ice water to finally obtain Ni48-xCoxMn37Sn9Cu6Magnetic refrigeration alloy material.
The third concrete implementation mode: the second embodiment is different from the first embodiment in that: in the first step, Ni is shown as a chemical general formula48-xCoxMn37Sn9Cu6And (3) carrying out batching, wherein x is the mole fraction, and x is 6. The rest is the same as the second embodiment.
The fourth concrete implementation mode: the second or third embodiment is different from the first or second embodiment in that: in the first step, Ni is shown as a chemical general formula48-xCoxMn37Sn9Cu6And (3) carrying out batching, wherein x is the mole fraction, and x is 8. The other embodiments are the same as the second or third embodiment.
The fifth concrete implementation mode: this embodiment is different from one of the second to fourth embodiments in that: in the first step, Ni is shown as a chemical general formula48-xCoxMn37Sn9Cu6And (3) carrying out batching, wherein x is a mole fraction, and x is 10. The other is the same as one of the second to fourth embodiments.
The sixth specific implementation mode: the present embodiment is different from one of the second to fifth embodiments in that: the purity of the nickel block, the manganese block, the tin block, the cobalt block and the copper block in the step one is more than 99.95 wt.%. The rest is the same as one of the second to fifth embodiments.
The seventh embodiment: the present embodiment is different from one of the second to sixth embodiments in that: the arc melting in the second step comprises the following specific operations: firstly, respectively adopting a mechanical pump and a molecular pump to pump vacuum to 4 x 10-3And after Pa, reversely filling high-purity argon to 0.07MPa, exciting an electric arc to start smelting, applying magnetic stirring in the smelting process, and repeatedly overturning and smelting for more than 6 times. The rest is the same as one of the second to sixth embodiments.
The detailed implementation mode is ten: the first difference between the present embodiment and the specific embodiment is: the high-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with the large magnetocaloric effect is used for refrigeration materials or refrigeration equipment at high working temperature; wherein, when x is 8, Ni is in 7T magnetic field40Co8Mn37Sn9Cu6The alloy obtains a giant magnetic entropy change of 34.8J/kg.K at 344K, and the compressive fracture strength and the compressive strain of the alloy are respectively as high as 1072.0MPa and 11.9 percent. . The rest is the same as the first embodiment.
The following examples were used to demonstrate the beneficial effects of the present invention:
the first embodiment is as follows: the preparation method of the Ni-Mn-Sn-Cu alloy with high temperature, high toughness and large magnetocaloric effect is completed according to the following steps:
firstly, preparing materials: according to the chemical formula of Ni48Mn37Sn9Cu6Proportioning, namely respectively weighing nickel blocks, manganese blocks, tin blocks, cobalt blocks and copper blocks as raw materials;
secondly, placing the raw materials weighed in the step one in a melting crucible, and carrying out arc melting to obtain a Ni-Mn-Sn-Cu button ingot; the specific operation of the arc melting is as follows: firstly, respectively adopting a mechanical pump and a molecular pump to pump vacuum to 4 x 10-3After Pa, reversely filling high-purity argon to 0.07MPa, exciting an electric arc to start smelting, applying magnetic stirring in the smelting process, and repeatedly overturning and smelting for more than 6 times;
thirdly, mechanically polishing the Ni-Mn-Sn-Cu button cast ingot to remove surface impurities, cleaning the cast ingot for 2-3 times by using acetone, cleaning the cast ingot for 2-3 times by using alcohol, and packaging the cast ingot into a vacuum degree of 10-3In a Pa quartz tube, the temperature is kept at 1073K for 36-48 h for homogenization treatmentAnd quenching into ice water to finally obtain Ni48Mn37Sn9Cu6Magnetic refrigeration alloy material.
Example two: the preparation method of the Ni-Co-Mn-Sn-Cu alloy with high temperature, high toughness and large magnetocaloric effect is completed according to the following steps:
firstly, preparing materials: according to the chemical formula of Ni42Co6Mn37Sn9Cu6Proportioning, namely respectively weighing nickel blocks, manganese blocks, tin blocks, cobalt blocks and copper blocks as raw materials;
secondly, placing the raw materials weighed in the step one in a melting crucible, and carrying out arc melting to obtain a Ni-Co-Mn-Sn-Cu button ingot; the specific operation of the arc melting is as follows: firstly, respectively adopting a mechanical pump and a molecular pump to pump vacuum to 4 x 10-3After Pa, reversely filling high-purity argon to 0.07MPa, exciting an electric arc to start smelting, applying magnetic stirring in the smelting process, and repeatedly overturning and smelting for more than 6 times;
thirdly, mechanically polishing the Ni-Co-Mn-Sn-Cu button cast ingot to remove surface impurities, cleaning the cast ingot with acetone for 2-3 times, cleaning the cast ingot with alcohol for 2-3 times, and packaging the cast ingot into a vacuum degree of 10-3In a Pa quartz tube, keeping the temperature for 36-48 h at 1073K for homogenization treatment, and quenching into ice water to finally obtain Ni42Co6Mn37Sn9Cu6Magnetic refrigeration alloy material.
Example three: the preparation method of the Ni-Co-Mn-Sn-Cu alloy with high temperature, high toughness and large magnetocaloric effect is completed according to the following steps:
firstly, preparing materials: according to the chemical formula of Ni40Co8Mn37Sn9Cu6Proportioning, namely respectively weighing nickel blocks, manganese blocks, tin blocks, cobalt blocks and copper blocks as raw materials;
secondly, placing the raw materials weighed in the step one in a melting crucible, and carrying out arc melting to obtain a Ni-Co-Mn-Sn-Cu button ingot; the specific operation of the arc melting is as follows: firstly, respectively adopting a mechanical pump and a molecular pump to pump vacuum to 4 x 10-3After Pa, high-purity argon is reversely filled to 0.07MPa, an electric arc is excited to start smelting, magnetic stirring is applied in the smelting process, andrepeatedly overturning and smelting for more than 6 times;
thirdly, mechanically polishing the Ni-Co-Mn-Sn-Cu button cast ingot to remove surface impurities, cleaning the cast ingot with acetone for 2-3 times, cleaning the cast ingot with alcohol for 2-3 times, and packaging the cast ingot into a vacuum degree of 10-3In a Pa quartz tube, keeping the temperature for 36-48 h at 1073K for homogenization treatment, and quenching into ice water to finally obtain Ni40Co8Mn37Sn9Cu6Magnetic refrigeration alloy material.
Example four: the preparation method of the Ni-Co-Mn-Sn-Cu alloy with high temperature, high toughness and large magnetocaloric effect is completed according to the following steps:
firstly, preparing materials: according to the chemical formula of Ni38Co10Mn37Sn9Cu6Proportioning, namely respectively weighing nickel blocks, manganese blocks, tin blocks, cobalt blocks and copper blocks as raw materials;
secondly, placing the raw materials weighed in the step one in a melting crucible, and carrying out arc melting to obtain a Ni-Co-Mn-Sn-Cu button ingot; the specific operation of the arc melting is as follows: firstly, respectively adopting a mechanical pump and a molecular pump to pump vacuum to 4 x 10-3After Pa, reversely filling high-purity argon to 0.07MPa, exciting an electric arc to start smelting, applying magnetic stirring in the smelting process, and repeatedly overturning and smelting for more than 6 times;
thirdly, mechanically polishing the Ni-Co-Mn-Sn-Cu button cast ingot to remove surface impurities, cleaning the cast ingot with acetone for 2-3 times, cleaning the cast ingot with alcohol for 2-3 times, and packaging the cast ingot into a vacuum degree of 10-3In a Pa quartz tube, keeping the temperature for 36-48 h at 1073K for homogenization treatment, and quenching into ice water to finally obtain Ni38Co10Mn37Sn9Cu6Magnetic refrigeration alloy material.
Example five: the preparation method of the Ni-Co-Mn-Sn-Cu alloy with high temperature, high toughness and large magnetocaloric effect is completed according to the following steps:
firstly, preparing materials: according to the chemical formula of Ni36Co12Mn37Sn9Cu6Proportioning, namely respectively weighing nickel blocks, manganese blocks, tin blocks, cobalt blocks and copper blocks as raw materials;
secondly, the mixture is mixed withPutting the raw materials weighed in the first step into a melting crucible, and carrying out arc melting to obtain a Ni-Co-Mn-Sn-Cu button ingot; the specific operation of the arc melting is as follows: firstly, respectively adopting a mechanical pump and a molecular pump to pump vacuum to 4 x 10-3After Pa, reversely filling high-purity argon to 0.07MPa, exciting an electric arc to start smelting, applying magnetic stirring in the smelting process, and repeatedly overturning and smelting for more than 6 times;
thirdly, mechanically polishing the Ni-Co-Mn-Sn-Cu button cast ingot to remove surface impurities, cleaning the cast ingot with acetone for 2-3 times, cleaning the cast ingot with alcohol for 2-3 times, and packaging the cast ingot into a vacuum degree of 10-3In a Pa quartz tube, keeping the temperature for 36-48 h at 1073K for homogenization treatment, and quenching into ice water to finally obtain Ni36Co12Mn37Sn9Cu6Magnetic refrigeration alloy material.
The phase analysis of the magnetic refrigeration alloy material obtained in the example is as follows:
FIG. 7 is a compression fracture stress-strain curve at room temperature of the magnetic refrigeration alloy material prepared in the first to fifth examples.
1. A wire cutting method is adopted, round pieces with the diameter of 3 multiplied by 1mm are respectively cut on the magnetic refrigeration alloy materials of the first embodiment, the second embodiment and the third embodiment to serve as phase change test samples, and DSC is adopted to measure the martensite phase change temperature to be 333.8K, wherein the temperature is far higher than the room temperature. FIG. 1 is a DSC curve of the magnetic refrigeration alloy material prepared in the first embodiment; FIG. 2 is a DSC curve of the magnetic refrigeration alloy material prepared in the second embodiment; FIG. 3 is a DSC curve of the magnetic refrigeration alloy material prepared in the third embodiment; from FIG. 1, it can be seen that the Co element-undoped alloy sample Ni48Mn37Sn9Cu6The martensitic transformation temperature is 480.1K; FIG. 2 shows that Ni42Co6Mn37Sn9Cu6The martensite transformation temperature of the alloy is 363.9K; from FIG. 3, Ni can be seen40Co8Mn37Sn9Cu6The martensitic transformation temperature of the alloy is 333.8K. In comparison, the martensitic transformation temperature of the alloy sample gradually decreased with increasing Co doping content, but remained at a level well above room temperature.
2. The magnetization intensity versus temperature curves of the magnetic refrigeration alloy materials prepared in examples one to four were measured using a magnetic measurement system (MPMS 3). FIG. 4 is a thermomagnetic curve of the magnetic refrigeration alloy material prepared in the first to the fourth embodiments under a magnetic field of 100 Oe; the magnetocaloric (M-T) curve of fig. 4 yields curie temperatures as high as 375.3K, i.e. the design requirements of curie temperature > martensitic transformation temperature > room temperature are achieved in this example.
3. Example III magnetocaloric Effect of magnetic refrigeration alloy Material application magnetic entropy Change Δ SMTo characterize; measuring the relation curve of the magnetization intensity of the magnetic refrigeration alloy material prepared in the third embodiment and an external magnetic field by using a magnetic measurement system (MPMS 3);
according to a relation based on Maxwell's equations:
Figure BDA0002181521100000061
entropy changes of the alloy samples under different magnetic field changes were calculated from isothermal magnetization (M-H) curves shown in FIG. 5, and the results are shown in FIG. 6, in which Ni is present in a 7T magnetic field40Co8Mn37Sn9Cu6The alloy obtained a giant magnetic entropy change of 34.8J/kg K at 344K.
4. By using a linear cutting method, cylinders with the diameter of 3 × 5mm are respectively cut on the magnetic refrigeration alloy materials of the first to fifth examples to serve as compression test samples, and as can be seen from the results of the compression fracture stress-strain curves shown in fig. 7, the compressive strength and the fracture strain of the magnetic refrigeration alloy material prepared in the third example are respectively as high as 1072.0MPa and 11.9%.

Claims (7)

1. A preparation method of a high-temperature high-toughness large-magnetocaloric-effect Ni-Co-Mn-Sn-Cu alloy is characterized in that the preparation method of the high-temperature high-toughness large-magnetocaloric-effect Ni-Co-Mn-Sn-Cu alloy is completed according to the following steps:
firstly, preparing materials: according to the chemical formula of Ni48-xCoxMn37Sn9Cu6Mixing, wherein x is molX is more than 0 and less than or equal to 12, the sum of the mole numbers of elements in the alloy is 100, and nickel blocks, manganese blocks, tin blocks, cobalt blocks and copper blocks are respectively weighed as raw materials;
secondly, placing the raw materials weighed in the step one in a melting crucible, and carrying out arc melting to obtain a Ni-Co-Mn-Sn-Cu button ingot;
thirdly, mechanically polishing the Ni-Co-Mn-Sn-Cu button cast ingot to remove surface impurities, cleaning the cast ingot with acetone for 2-3 times, cleaning the cast ingot with alcohol for 2-3 times, and packaging the cast ingot into a vacuum degree of 10-3In a Pa quartz tube, keeping the temperature for 36-48 h at 1073K for homogenization treatment, and quenching into ice water to finally obtain Ni48-xCoxMn37Sn9Cu6Magnetic refrigeration alloy material.
2. The method for preparing the high-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with large magnetocaloric effect according to claim 1, wherein the chemical formula of Ni in the step one is shown as Ni48-xCoxMn37Sn9Cu6And (3) carrying out batching, wherein x is the mole fraction, and x is 6.
3. The method for preparing the high-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with large magnetocaloric effect according to claim 1, wherein the chemical formula of Ni in the step one is shown as Ni48-xCoxMn37Sn9Cu6And (3) carrying out batching, wherein x is the mole fraction, and x is 8.
4. The method for preparing the high-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with large magnetocaloric effect according to claim 1, wherein the chemical formula of Ni in the step one is shown as Ni48-xCoxMn37Sn9Cu6And (3) carrying out batching, wherein x is a mole fraction, and x is 10.
5. The method for preparing the Ni-Co-Mn-Sn-Cu alloy with high temperature, high toughness and large magnetocaloric effect according to claim 1, wherein the purity of the nickel block, the manganese block, the tin block, the cobalt block and the copper block in the step one is more than 99.95 wt.%.
6. The method for preparing the high-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with the large magnetocaloric effect according to claim 1, wherein the arc melting in the second step is specifically performed by: firstly, respectively adopting a mechanical pump and a molecular pump to pump vacuum to 4 x 10-3And after Pa, reversely filling high-purity argon to 0.07MPa, exciting an electric arc to start smelting, applying magnetic stirring in the smelting process, and repeatedly overturning and smelting for more than 6 times.
7. The method for preparing the high-temperature high-toughness Ni-Co-Mn-Sn-Cu alloy with large magnetocaloric effect according to claim 1, wherein the Ni prepared in the third step48-xCoxMn37Sn9Cu6The magnetic refrigeration alloy material is used for refrigeration materials or refrigeration equipment at high working temperature; wherein, when x is 8, Ni is in 7T magnetic field40Co8Mn37Sn9Cu6The alloy obtains a giant magnetic entropy change of 34.8J/kg.K at 344K, and the compressive fracture strength and the compressive strain of the alloy are respectively as high as 1072.0MPa and 11.9 percent.
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