Magnetic material with magnetic field-driven martensitic twin rearrangement and preparation method thereof
A magnetic material and magnetic field-driven technology, which is applied in the field of magnetically controlled shape memory materials, can solve the problems of insufficient mechanical properties of materials and difficulty in industrial promotion, and achieve the effects of improving magnetic properties and mechanical properties, large magneto-induced strain, and reducing alloy costs
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Embodiment 1
[0023] The composition of the preparation is Co 42 Ni 32 al 25.5 Ga 0.5 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:
[0024] (1) Weighing Co, Ni, Al, Ga with a purity of 99.9% respectively;
[0025] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -3 b. The melting temperature is 1300°C; c. The melting process uses magnetic stirring; d. The melting time is 0.5 hours.
[0026] (3) Carry out vacuum annealing treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 550 ℃; time: 100 hours; vacuum degree: 1×10 -2 MPa. Then cool down to room temperature with the furnace.
[0027] The polycrystalline sample prepared by the above method was cut into 5×5×8 mm samples by wire cutting to detect various characteristic curves.
Embodiment 2
[0029] The composition of the preparation is Co 40 Ni 30 al 23 Ga 7 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:
[0030] (1) Weighing Co, Ni, Al, Ga with a purity of 99.9% respectively;
[0031] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -4 b. The melting temperature is 1400°C; c. The melting process uses magnetic stirring; d. The melting time is 1.5 hours.
[0032] (3) Carry out vacuum annealing treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 800°C; time: 70 hours; vacuum degree: 5×10 -2 MPa. Then cool down to room temperature with the furnace.
[0033] The polycrystalline sample prepared by the above method was cut into 5×5×8 mm samples by wire cutting to detect various characteristic curves.
Embodiment 3
[0035] The composition of the preparation is Co 28 Ni 30 al 32 Ga 10 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:
[0036] (1) Weighing Co, Ni, Al, Ga with a purity of 99.9% respectively;
[0037] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -5 b. The melting temperature is 1500°C; c. The melting process uses magnetic stirring; d. The melting time is 2 hours.
[0038] (3) Carry out vacuum annealing treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 1000 ℃; time: 24 hours; vacuum degree: 1×10 -3 MPa. Then cool down to room temperature with the furnace.
[0039] The polycrystalline sample prepared by the above method was cut into 5×5×8 mm samples by wire cutting to detect various characteristic curves.
[0040]
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