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A method for controlling the microstructure and properties of high-entropy alloys by using a magnetic field
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A technology of high-entropy alloy and magnetic field control, which is applied in the direction of improving energy efficiency and process efficiency, and can solve the problems of long experimental period, difficulty in obtaining high-strength materials, magnetic anisotropy functional materials, and complicated processes to achieve optimal performance , improve the organization, the method is simple and easy to implement
Active Publication Date: 2022-07-12
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
Although the above methods can achieve the effect of improving the structure and properties of high-entropy alloys, the experimental period is often long and the process is complicated, and it is not easy to obtain high-strength materials with significantly refined structures and functional materials with magnetic anisotropy. Looking for a fast and simple improvement The method of its organization and performance is extremely urgent
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Embodiment 1
[0059] The high-entropy alloy described in this embodiment is CoCrFeNi, and the used magnetic field strength is 6T.
[0060] The specific process of the method for adjusting the microstructure and mechanical properties of CoCrFeNi high-entropy alloys by magnetic field treatment described in this embodiment is as follows:
[0061] Step 1, alloy preparation:
[0062]The first step is to prepare alloy raw materials. Select FeCoCr master alloy, Ni block (purity 99.95%) and high-purity Co, Cr, Fe, Ni (purity 99.99%) as raw materials, the Co, Cr, Fe, Ni are solid elemental raw materials. The ingredients were prepared with the atomic ratio of Co:Cr:Fe:Ni=1:1:1:1:1, ultrasonically cleaned with acetone for 10 min, dried with a hair dryer, and put into a sample bag for use.
[0063] The second step is alloy melting. First, the furnace body is preheated, then the raw materials are put into the crucible of the vacuum induction melting furnace, heated to 400 °C in a vacuum below 10Pa fo...
Embodiment 2
[0073] The high-entropy alloy described in this embodiment is AlCoCrFeNi, and the used magnetic field strength is 6T.
[0074] The specific process of the method for adjusting the microstructure and magnetic properties of AlCoCrFeNi high-entropy alloys by magnetic field treatment described in this embodiment is as follows:
[0075] Step 1, alloy preparation:
[0076] The first step is to prepare alloy raw materials. Choose FeCoCr, Ni 2 Al master alloy (purity 99.95%) and high-purity Al, Co, Cr, Fe, Ni (purity 99.99%) are used as raw materials, and the Al, Co, Cr, Fe, and Ni are solid elemental raw materials. Al:Co:Cr:Fe:Ni=1:1:1:1:1 atomic ratio of ingredients, mechanical grinding to remove line cutting marks, ultrasonic cleaning with acetone for 10min, and drying in a drying oven.
[0077] The second step is alloy melting. First, the furnace body is preheated, then the raw materials are put into the crucible of the vacuum induction melting furnace, heated to 400 °C in a v...
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Abstract
The invention discloses a method for regulating the structure and properties of a high-entropy alloy by using a magnetic field, comprising: placing a high-entropy alloy block prepared by smelting inside a quartzglass tube, and laying B in the quartzglass tube 2 O 3 Purifier completely coats the HEA block; will contain B 2 O 3 The sample-carrying quartzglass tube of the scavenger and the high-entropy alloy block is placed in the uniform magnetic field of the excitation coil, and the sample-carrying quartz glass tube is heated-insulated-cooled, and finally quenched to obtain the high-entropy alloy coated with the scavenger melt. In the present invention, the high-entropy alloy is coated with a coating agent in an atmospheric environment, and a strong magnetic field acts on the high-entropy alloy in the treatment process, and the alloy structure obtained after the magnetic field treatment of the CoCrFeNi high-entropy alloy is refined compared with the non-magnetic field condition. , the mechanical properties are more excellent; at the same time, the alloy structure obtained by magnetic field treatment of AlCoCrFeNi high-entropy alloy is uniformly distributed and has orientation, which makes the magnetic orientation more excellent.
Description
technical field [0001] The invention belongs to the technical field of high-entropy alloy material processing, and in particular relates to a method for regulating the microstructure and properties of high-entropy alloys by utilizing a magnetic field. Background technique [0002] Different from traditional alloy design concepts, high-entropy alloys form solid solution structures such as body-centered cubic (FCC), face-centered cubic (BCC), and hexagonal close-packed (HCP) due to their high mixing entropy. There are two forms regarding the definition of high-entropy alloys. Based on composition, high-entropy alloys are defined as alloys containing five or more main elements, each in the range of 5 to 35 atomic percent, and if If other elements are contained, the atomic percentage of these minor elements shall not exceed 5%; based on the entropy of mixing, high-entropy alloys are defined as alloys whose configuration entropy exceeds 1.5R in any state. The excellent propertie...
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