A bi-substituted mn-deficient mn 2 Sb-based alloy and its preparation method and application
A kind of base alloy and alloy technology, which is applied in the Mn-deficient Mn2Sb base alloy substituted by Bi and its preparation field, can solve the problems that the first-level magnetoelastic phase change material cannot be obtained and the replacement cannot be realized, and the preparation method is simple and convenient, and the energy The effect of less consumption and cost reduction
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Embodiment 1
[0044] A Bi-substituted Mn-deficient Mn 2 The preparation method of Sb-based alloy, comprises the steps:
[0045] This embodiment has an alloy with a first-order magnetoelastic phase transition, and its chemical formula is Mn 2-y Sb 1-x Bi x , both x and y take 0.03.
[0046] Calculate the mass of the required Mn, Sb, and Bi elemental elements according to the ratio of the amount of the substance for batching. The accuracy is 0.1mg-0.01mg. The purity of the metal elements is above 99.99%. To compensate for the loss caused by Mn volatilization during the smelting process;
[0047] Put the prepared raw materials into the water-cooled copper crucible electric arc furnace, and pump the vacuum to 10 -3 Below Pa, fill in argon gas with a purity of 99.999% at 1 atmosphere, and carry out arc melting. During the first smelting, use a current of 25A to melt the metal until the molten metal in the crucible flows. Turn over the sample, increase the current to 35A and melt 4 times to...
Embodiment 2
[0050] This embodiment has an alloy with a first-order magnetoelastic phase transition, and its chemical formula is Mn 2-y Sb 1-x Bi x , x is 0.03, and y is 0.06. The specific preparation method is the same as that of Example 1, except that the ingot annealing temperature is 1000°C and the annealing time is 200h. Adopt the measurement process of embodiment 1, in Mn 1.94 Sb 0.93 Bi 0.03 A clear first-order magnetoelastic phase transition was also observed in the samples.
Embodiment 3
[0052] This embodiment has an alloy with a first-order magnetoelastic phase transition, and its chemical formula is Mn 2-y Sb 1-x Bi x , x takes 0.07, and y takes 0.1, and the specific preparation method is the same as the preparation process of Example 1, the difference is that Mn 1.9 Sb 0.93 Bi 0.07 The stoichiometric ratio is used to calculate the mass of the required Mn, Sb, and Bi elements for batching. The ingot annealing temperature is 900°C, and the annealing time is 180h. Using the measurement process of Example 1, in Mn 1.9 Sb 0.93 Bi 0.07 A clear first-order magnetoelastic phase transition was observed in the samples.
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