An in-situ self-generated hybrid phase-reinforced magnesium-based amorphous composite based on selective phase dissolution and its preparation method
A technology of amorphous composite materials and composite materials, which is applied in the field of in-situ self-generated hybrid phase-reinforced magnesium-based amorphous composite materials and its preparation, can solve the problem of difficult improvement of mechanical properties such as strong plasticity of composite materials, and the difficulty of uniform dispersion of the second phase and other problems, to achieve the effect of large plastic deformation, improved mechanical properties, and simple operation process
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[0035] The preparation method of the in-situ self-generated hybrid phase-reinforced magnesium-based amorphous composite material based on selective phase dissolution provided by the present invention comprises the following steps:
[0036] S1, Ni, Ti, Gd, Nb raw materials are mixed and smelted, and the Ni-Ti-Gd-Nb pre-alloy with NiTi (Nb) and NiGd two phases is obtained after cooling;
[0037] S2, annealing the Ni-Ti-Gd-Nb pre-alloy, so that the nano-β-Nb phase is precipitated from the NiTi(Nb) phase, and a hybrid reinforced structure is obtained;
[0038] S3. Mix and smelt the annealed Ni-Ti-Gd-Nb pre-alloy with Mg and Ag raw materials. After cooling, the matrix is Mg-Ni-Gd-Ag amorphous alloy, NiTi(Nb)+β-Nb mixed The magnesium-based amorphous composite material is dispersedly distributed in the matrix.
[0039] The invention adopts a novel selective phase dissolution process, supplemented by subsequent annealing treatment, and successfully introduces the in-situ self-gener...
Embodiment 1
[0060] 1) Grind the nickel block, titanium block, gadolinium block, niobium block, and magnesium block with a purity of 99.9% to remove the surface scale, and then perform ultrasonic cleaning in absolute ethanol. After drying, follow the (Mg 0.69 Ni 0.15 Gd 0.10 Ag 0.06 ) 90 (Ti 0.44 Ni 0.47 Nb 0.09 ) 10 Atomic formulation of nickel block, titanium block, gadolinium block, niobium block;
[0061] 2) Put the prepared raw materials of nickel block, titanium block, gadolinium block and niobium block into the vacuum arc melting furnace, and vacuumize to 3×10 - 3 After Pa, argon gas is passed into the vacuum chamber until the chamber pressure is -0.05MPa; the raw materials are arc smelted, and the alloy ingots at each station are kept for 3 minutes after they are completely melted. Remelting after turning over, each alloy ingot was smelted 4 times in total, after smelting, it was cooled with a water-cooled copper mold, and the initial Ni-Ti-Gd-Nb alloy ingot was taken out;...
Embodiment 2
[0070] 1) Grind the nickel block, titanium block, gadolinium block, niobium block, and magnesium block with a purity of 99.9% to remove the surface scale, and then perform ultrasonic cleaning in absolute ethanol. After drying, follow the (Mg 0.69 Ni 0.15 Gd 0.10 Ag 0.06 ) 95 (Ti 0.44 Ni 0.47 Nb 0.09 ) 5 Atomic formulation of nickel block, titanium block, gadolinium block, niobium block;
[0071] 2) Put the prepared raw materials of nickel block, titanium block, gadolinium block and niobium block into the vacuum arc melting furnace, and vacuumize to 3×10 - 3 After Pa, pass argon gas into the vacuum chamber until the chamber pressure is -0.05MPa; carry out arc melting on the raw materials, and keep the raw materials for 3 minutes after they are completely melted. Smelting 4 times, after the smelting is finished, the bottom mold in the electric arc melting furnace, namely the water-cooled copper mold, is cooled, and the initial Ni-Ti-Gd-Nb alloy ingot is taken out;
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