Six-element high-entropy alloy with first-order magnetic phase transition and preparation method thereof
A high-entropy alloy and magnetic phase transition technology, applied in the field of high-entropy alloys, can solve the problems that high-entropy alloys cannot achieve the first-order magnetic phase transition, and achieve critical transition temperature reversibility, large magnetic phase transition temperature range, and critical transition The effect of temperature
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Embodiment 1
[0034] The composition of the electrolyte is as follows: DMSO, vitamin C (0.02 mol L ?1 ), (C 2 h 5 ) 4 NPF 6 (0.02 mol·L -1 ), GdCl 3 (0.015mol·L ?1 ), FeCl 2 (0.0075 mol L ?1 ), CoCl 2 (0.0075 mol L ?1 ), NiCl 2 (0.0075 mol L ?1 ), MnCl 2 (0.0075 mol L ?1 ) and MgCl 2 (0.015 mol L ?1 ). Using copper as the working electrode, platinum sheet as the counter electrode, and a saturated calomel electrode as the reference electrode, the electrochemical reduction deposition was carried out at 30°C, the deposition time was 1h, and the deposition potential was 2V.
[0035] By the above method, the composition is obtained as Mg 19.09 mn 7.83 Fe 29.09 co 16.93 Ni 17.91 Gd 9.15 alloy. Magnetic studies have shown (results such as Figure 4 shown), when the applied magnetic fields are 20, 40, 60 kOe, the transition temperatures are 210, 110, and 90K, respectively.
Embodiment 2
[0037] The composition of the electrolyte is as follows: DMSO, vitamin C (0.02 mol L ?1 ), (C 2 h 5 ) 4 NPF 6 (0.02 mol·L -1 ), GdCl 3 (0.02 mol·L ?1 ), FeCl 2 (0.01 mol·L ?1 ), CoCl 2 (0.01 mol·L ?1 ), NiCl 2 (0.01 mol·L ?1 ), MnCl 2 (0.01 mol·L ?1 ), MgCl 2 (0.02 mol·L ?1 ). Using copper as the working electrode, platinum sheet as the counter electrode, and a saturated calomel electrode as the reference electrode, the electrochemical reduction deposition was carried out at 30°C, the deposition time was 1h, and the deposition potential was 2V.
[0038] By the above method, the composition is obtained as Mg 12.03 mn 11.46 Fe 30.10 co 25.17 Ni 16.15 Gd 5.09 alloy. The magnetic results show that (such as Figure 5 As shown), the alloy undergoes a magnetic transition at about 60K when the applied magnetic field is 5000 Oe; and when the applied magnetic field is 10000 Oe, its transformation temperature drops to 30K.
Embodiment 3
[0040] The composition of the electrolyte is as follows: DMSO, vitamin C (0.02 mol L ?1 ), (C 2 h 5 ) 4 NPF 6 (0.02 mol·L -1 ), GdCl 3 (0.015 mol L ?1 ), FeCl 2 (0.01 mol·L ?1 ), CoCl 2 (0.01 mol·L ?1 ), NiCl 2 (0.01 mol·L ?1 ), MnCl 2 (0.01 mol·L ?1 ), MgCl 2 (0.015 mol L ?1 ). Using copper as the working electrode, platinum sheet as the counter electrode, and a saturated calomel electrode as the reference electrode, the electrochemical reduction deposition was carried out at 30°C, the deposition time was 1h, and the deposition potential was 2V.
[0041] By the above method, the composition is obtained as Mg 14.86 mn 6.02 Fe 34.74 co 15.66 Ni 22.99 Gd 5.73 alloy. The magnetic results show that (such as Figure 6 As shown), the alloy undergoes a magnetic transition at around 85K when the applied magnetic field is 5000 Oe.
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