Preparation method of amorphous alloy gradient composite material

A technology of amorphous alloys and composite materials, applied in the field of preparation of amorphous alloy gradient composite materials, can solve the problems of poor universality and inability to realize flexible design of gradient composite materials, and achieve simple process, good interface bonding state, The effect of flexible design

Active Publication Date: 2021-06-11
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the defects of the prior art, the object of the present invention is to provide a method for obtaining an amorphous alloy gradient composite material with corresponding enhanced phase gradient distribution characteristics by controlling the temperature gradient field distribution inside the sample during spark plasma sintering, the method The flexible design and material preparation of the reinforcement ...

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  • Preparation method of amorphous alloy gradient composite material
  • Preparation method of amorphous alloy gradient composite material
  • Preparation method of amorphous alloy gradient composite material

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preparation example Construction

[0054] The invention provides a method for preparing an amorphous alloy composite gradient material. The amorphous alloy gradient composite material includes a matrix phase and a reinforcement phase, the matrix phase is an amorphous alloy, and the reinforcement phase is nanocrystals generated in situ from the amorphous alloy matrix Or the crystal second phase, and the characteristic parameters of the reinforcement phase present a gradient change along one or more directions of the material; the preparation method of the amorphous alloy composite material includes the following steps:

[0055] (1) Obtain the isothermal crystallization law of the matrix phase amorphous alloy composition of the target amorphous alloy gradient composite material through spark plasma sintering experiments, and obtain the characteristic parameters of the reinforcement phase corresponding to the amorphous alloy composition under different sintering process parameters, and The nonlinear mapping relatio...

Embodiment 1

[0099] Ti with strong amorphous forming ability 45 Zr 20 be 29 Fe 6 Titanium-based amorphous alloy composition, its glass transition temperature T g is 361°C, the crystallization initiation temperature T x is 441°C, the width of the supercooled liquid phase region is 80°C, and the adjustment window of the gradient temperature field is relatively large. The crystallization phase of the amorphous alloy composition is β-Ti phase, which belongs to the soft and tough phase, and the Ti-based amorphous alloy composite material obtained after in-situ crystallization has good plastic deformation ability.

[0100] The target Ti-based amorphous alloy radially gradient composite material has a total volume fraction of the reinforcement phase of 75%, and the sample size is a cylindrical sample with a diameter of 20mm and a height of 5mm. The volume fraction of the reinforcement phase decreases linearly from the center to the outer edge along the radial direction. The method for prepar...

Embodiment 2

[0107] The target amorphous alloy gradient composite material is an axially layered gradient material. Its technical feature is that the volume fraction of the reinforcing phase decreases linearly in the axial direction, and the total volume fraction is 75%. The sample size is a cylindrical sample with a diameter of 5mm and a height of 20mm. Others are consistent with Example 1.

[0108] The experimental data samples were obtained in the pre-experiment, and the neural network was trained with the data samples until the ideal prediction accuracy was achieved; the target gradient temperature field was inversely deduced according to the nonlinear mapping relationship between the process parameters established by the neural network and the volume fraction of the enhanced phase. The shape, size and material of the spark plasma sintering mold were designed in combination with numerical simulation. In order to generate the gradient temperature field of this embodiment, the placement ...

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Abstract

The invention belongs to the field of amorphous alloy composite material preparation, and particularly relates to a preparation method of an amorphous alloy gradient composite material. According to the preparation method of the amorphous alloy gradient composite material, an isothermal crystallization rule of an amorphous alloy matrix is obtained through an experiment, and a nonlinear mapping relation between sintering process parameters and reinforcement phase characteristic parameters is established through a neural network; a required temperature field is reversely deduced by combining reinforcement phase distribution characteristics of a target amorphous alloy gradient composite material, and then a sintering mold is designed by taking amorphous alloy powder or a block as a raw material and adopting a spark plasma sintering technology and combining numerical simulation, and spark plasma sintering treatment is carried out on the amorphous alloy powder under the required sintering process parameters and temperature field to obtain the amorphous alloy gradient composite material with continuous gradient distribution of the reinforced phase. According to the preparation method of the amorphous alloy gradient composite material, flexible design and preparation forming of the large-size bulk amorphous alloy gradient composite material can be achieved, the process is simple and efficient, a reinforced phase is obtained in an in-situ endogenous mode, and the interface bonding state is good.

Description

technical field [0001] The invention belongs to the field of preparation of amorphous alloy composite materials, and more specifically relates to a preparation method of amorphous alloy gradient composite materials. Background technique [0002] The internal atomic arrangement of amorphous alloy is disordered in long range and ordered in short range, and there are no defects such as grain boundaries and dislocations inside. All of them have high strength, high hardness and excellent corrosion resistance, but their plasticity at room temperature is generally poor. Susceptible to catastrophic fracture, its application as a high-performance structural material has been seriously developed. The introduction of the second phase into the amorphous matrix to prepare amorphous alloy composites can improve its room temperature plasticity. At the same time, the document "A novel structural gradient metallic glass composite with enhanced mechanical properties" mechanically grinds the s...

Claims

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Application Information

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IPC IPC(8): B22F3/105C22C45/10G06N3/08G06T7/62G16C10/00G16C20/10G16C20/70G16C60/00
CPCC22C33/003C22C45/10B22F3/105G16C60/00G16C20/70G16C20/10G16C10/00G06N3/084G06N3/086G06T7/62
Inventor 王新云丁华平龚攀邓磊金俊松张茂唐学峰
Owner HUAZHONG UNIV OF SCI & TECH
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