A kind of 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 difficult to prepare high-density high-performance alloy materials, uncontrollable solid-liquid phase volume fraction ratio, and complicated preparation of raw material powder, etc. Excellent performance, integration of processing and heat treatment, improvement of internal quality and comprehensive mechanical properties
Active Publication Date: 2021-07-27
GUANGZHOU INST OF RAILWAY TECH
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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
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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 invention relates to a multi-scale structure alloy material, a preparation method and its use. The preparation method includes the following steps: 1) powder densification sintering: put the alloy powder into a sintering mold, and sinter it after pre-pressing. The sintering pressure is 20~ 100MPa, the sintering temperature Ts meets: the starting temperature of the phase transition peak of the alloy powder ≤ Ts ≤ the end temperature of the phase transition peak of the alloy powder; 2) High pressure treatment: after the sintering is completed, pressurize and cool, and the cooling pressure is 10-500MPa; pressure relief Cooling: After pressurization and cooling, the temperature drops to 550-600°C, quickly release the pressure, and cool to obtain alloy materials. Based on the method of the present invention, a simple and easy-to-operate material forming preparation method has been developed, which combines the preparation of alloy materials and subsequent processing technologies into one, and realizes the integration of dual-scale / multi-scale nano / ultrafine-grained structure alloy materials Forming, through in-situ regulation of the microstructure, grain size, etc. inside the alloy, to prepare high-strength and tough alloy materials.
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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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