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Multi-scale structure alloy material, preparation method and application thereof

An alloy material, multi-scale technology, applied in the field of multi-scale structure alloy material preparation, can solve the problems of difficulty in preparing high-density high-performance alloy materials, uncontrollable solid-liquid phase volume fraction ratio, and difficulty in preparing semi-solid slurry, etc. Achieve the effect of excellent comprehensive performance, integration of processing and heat treatment, improvement of internal quality and comprehensive mechanical properties

Active Publication Date: 2020-07-14
GUANGZHOU INST OF RAILWAY TECH
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  • Claims
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Problems solved by technology

However, the above-mentioned methods have problems such as complicated follow-up processing procedures, cumbersome raw material powder preparation, difficult preparation of semi-solid slurry, uncontrollable solid-liquid phase volume fraction ratio, etc., making it difficult to popularize these methods in many alloy systems, and even more difficult Preparation of highly dense and high-performance alloy materials with controllable microstructure

Method used

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  • Multi-scale structure alloy material, preparation method and application thereof
  • Multi-scale structure alloy material, preparation method and application thereof
  • Multi-scale structure alloy material, preparation method and application thereof

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Embodiment 1

[0046] The preparation method based on the alloy material in situ refinement grain of the present invention comprises the following steps:

[0047] (1) Densification and sintering of alloy powder: Weigh 20g of Ti-6Al-4V atomized alloy powder, put it into a graphite mold with a diameter of φ20mm and H50mm, pre-press with a pressure of 20MPa, and then put it into spark plasma sintering In the furnace cavity of the system, the sintering equipment: SPS-3.20MK-IV spark plasma sintering system; apply and maintain a sintering pressure of 30MPa through the upper and lower electrode plates, vacuumize to 10-2Pa, and then fill it with high-purity argon for protection. Pulse current rapid sintering, the process conditions are as follows:

[0048] Sintering method: pulse current;

[0049] Duty ratio of pulse current: 12:2;

[0050] Sintering pressure: 30MPa;

[0051] Heating rate: 100K / min;

[0052] Sintering temperature Ts: 1100°C;

[0053] Among them, the starting temperature of the...

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Abstract

The present invention relates to a multi-scale structure alloy material, a preparation method and application thereof. The preparation method includes the following steps that (1), powder densification and sintering are carried out, specifically, alloy powder is put into a sintering mold and sintered after pre-pressing, and the sintering pressure is 20-100MPa, wherein the starting temperature of an alloy powder phase change peak<=the sintering temperature Ts<=the end temperature of the alloy powder phase change peak; (2), high pressure treatment is carried out, specifically, after sintering, pressure cooling is carried out, and the cooling pressure is 10-500MPa; and (3), pressure relief cooling is carried out, specifically, when the pressure cooling temperature is reduced to 550-600 DEG C,the pressure relief is carried out quickly, and the alloy material is obtained by cooling. Based on the preparation method, a simple and easy-to-operate material forming and preparation method is developed. The preparation of the alloy material and a subsequent treatment technology are combined into one to realize the integral forming of the double-scale / multi-scale nano / ultra-fine grain structure alloy material. The alloy material with high strength and toughness is prepared by in-situ regulating the microstructures and grain sizes of an alloy.

Description

technical field [0001] The invention belongs to the technical field of alloy material preparation, and in particular relates to a multi-scale structure alloy material, a preparation method and an application thereof. Background technique [0002] With the development and progress of national science and technology, the preparation of alloy materials with higher strength and toughness to meet the application under harsher conditions has always been the goal pursued by researchers. After decades of deposition and inheritance, the way of strengthening and toughening alloy materials has gradually developed into a variety of processing technologies. According to the classic theory that the microstructure of materials determines the macroscopic properties, the ultimate goal of researchers is to effectively optimize the comprehensive properties of alloy materials by precisely controlling the microstructure (phase composition, grain size, distribution position and specific shape), e...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C33/02C22C14/00B22F3/14B22F3/24
CPCB22F3/14B22F3/24B22F2003/248C22C1/04C22C1/0458C22C14/00C22C33/02
Inventor 康利梅庞兴
Owner GUANGZHOU INST OF RAILWAY TECH
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