A kind of Mn-based magnetic phase change alloy and its preparation method and application
A magnetic phase change and alloy technology, applied in the field of magnetic phase change alloys, can solve the problems of fragility, poor mechanical properties, low strength, etc.
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Embodiment 1
[0032] This example is an alloy MnCoY with martensitic transformation. According to the stoichiometric ratio, the mass of the required Mn, Co, and Y elemental substances is calculated for batching. It needs to be accurate to 0.1mg-0.01mg, and the purity of the metallic elements is 99.99%. %above. Put the prepared raw materials into the water-cooled copper crucible arc melting furnace, and pump the vacuum to 5×10 -3 Below Pa, fill with argon gas with a purity of 99.999% at 1 atmospheric pressure for arc melting. During the first smelting, use 23A current to melt the metal, just see the molten metal flowing in the crucible, turn over the block sample smelted in the first pass, slightly increase the current to 40A and then smelt 4 times, you can get MnCoY Alloy ingots; put part of the alloy ingot samples into a quartz tube with an inner diameter of 10mm closed at one end, pump the vacuum to below 3Pa, fill in 0.5 atmospheres of argon gas for washing, repeat 4 times, and wash for...
Embodiment 2
[0034] This embodiment is an alloy MnCoY that can undergo temperature-driven magnetic phase transition 0.97 Ti 0.03 , the specific preparation method of the sample is the same as the preparation process of Example 1, the only difference is that according to MnCoY 0.97 Ti 0.03 Calculate the mass of Mn, Co, Y, and Ti elemental elements required for batching according to the stoichiometric ratio. In MnCoY 0.97 Ti 0.03 A temperature-driven martensitic transformation is obtained in the alloy sample, and the transformation is near room temperature. And found that there is an exchange bias phenomenon. The relationship between the coercive field and the bias field of the sample with temperature figure 2 shown.
Embodiment 3
[0036] This embodiment is an alloy MnCoY that can undergo temperature-driven magnetic phase transition 0.9 Ti 0.1 , the specific preparation method of the bulk alloy is the same as the preparation process of Example 1, the difference is that part of the MnCoY 0.9 Ti 0.1 The alloy ingot is put into a quartz tube with an inner diameter of 10 mm, and then the quartz tube is placed in a high vacuum belt furnace, and the furnace cavity is evacuated to 10 mm. -4Pa, the argon gas of 0.5 atmosphere pressure is introduced, the ingot is melted into a liquid state by high-frequency induction heating, and then sprayed onto the high-speed rotating copper roller through the small hole at the bottom of the quartz tube. The rotation speed of the copper roller is 18m / s, and the Quickly quench the strip sample; put the strip sample into a quartz tube with an inner diameter of 10mm closed at one end, pump the vacuum to below 3Pa, fill it with argon gas at 0.5 atmospheric pressure for washing, ...
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