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In-situ synthesis mixed phase reinforced magnesium-based amorphous composite material based on selective phase dissolution and preparation method thereof

An amorphous composite material and a composite material technology are applied in the field of in-situ hybrid phase reinforced magnesium-based amorphous composite material and its preparation, which can solve the problem that the mechanical properties such as the strong plasticity of the composite material are difficult to improve, and the second phase is difficult to uniformly disperse and distribute. and other problems, to achieve the effects of large plastic deformation, improved mechanical properties, and easy operation.

Active Publication Date: 2022-01-11
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For the defects of the prior art, the purpose of the present invention is to provide a kind of hybrid phase reinforced magnesium-based amorphous composite material, by adjusting the element composition in the composite material, obtain the Mg-Ni-Gd-Ag amorphous matrix, wherein NiTi(Nb ) + β-Nb hybrid reinforced phase uniformly dispersed composite material, aiming to solve the problem of forming an oxide layer or interface layer between the second phase and the matrix in the existing magnesium-based amorphous composite material, and the second phase is difficult to uniformly disperse and distribute, This leads to the problem that it is difficult to improve the mechanical properties of composite materials such as strong plasticity.

Method used

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  • In-situ synthesis mixed phase reinforced magnesium-based amorphous composite material based on selective phase dissolution and preparation method thereof
  • In-situ synthesis mixed phase reinforced magnesium-based amorphous composite material based on selective phase dissolution and preparation method thereof
  • In-situ synthesis mixed phase reinforced magnesium-based amorphous composite material based on selective phase dissolution and preparation method thereof

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preparation example Construction

[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;

[0...

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Abstract

The invention belongs to the technical field of magnesium-based amorphous composite materials, and discloses an in-situ synthesis mixed phase reinforced magnesium-based amorphous composite material based on selective phase dissolution and a preparation method thereof. The composition expression of the material is (Mg<0.69>Ni<0.15>Gd<0.10>Ag<0.06>)<100-x>(Ti<0.44>Ni<0.47>Nb<0.09>)<x>, wherein x represents an atomic ratio and x is greater than or equal to 5 and less than or equal to 20, an matrix is Mg-Ni-Gd-Ag amorphous alloy, a reinforcing phase is a mixed phase formed by separating out a nano beta-Nb phase from the interior of a NiTi (Nb) phase, and the mixed phase is uniformly dispersed and distributed in the matrix. According to the preparation method, a selective phase dissolution process is adopted, follow-up annealing treatment is assisted, an in-situ synthesis mixed reinforced phase is successfully introduced into the Mg-based amorphous matrix, and due to the existence of a NiTi(Nb)+beta-Nb mixed reinforced structure, the composite material shows excellent mechanical properties of high strength and large plastic deformation.

Description

technical field [0001] The invention belongs to the technical field of magnesium-based amorphous composite materials, and more specifically relates to an in-situ self-generated hybrid phase-reinforced magnesium-based amorphous composite material based on selective phase dissolution and a preparation method thereof. Background technique [0002] Due to the special atomic arrangement characteristics of long-range disorder and short-range order, amorphous alloys exhibit superior mechanical properties such as high strength and large elastic limit, and have attracted a lot of research interest. At present, amorphous alloys with various alloy systems such as Zr-based, Pd-based, and Fe-based have been developed. Among them, Mg-based amorphous alloys have broad application prospects due to their advantages such as low density, high specific strength and low cost. However, Mg-based amorphous alloys exhibit extreme brittleness at room temperature and severe fracture failures occur. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/00C22C1/03C22F1/10C21D1/26C22B9/04C22B9/20B22F3/115B22D23/00
CPCC22C45/005C22C1/03C22F1/10C22F1/002C21D1/26C22B9/04C22B9/20B22F3/115B22D23/003C22C2200/02C22C1/11Y02P10/25
Inventor 郭威张震赵觅吕书林吴树森
Owner HUAZHONG UNIV OF SCI & TECH
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