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Pseudo-plastic forming method for processing metal-based composite materials

A composite material and plastic forming technology, applied in the direction of metal processing equipment, etc., can solve the problems of severe tool wear, high processing cost, and difficult processing, and achieve the effects of low forming stress, high processing efficiency, and low cost

Inactive Publication Date: 2010-06-09
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of a large number of hard and brittle ceramic particles, the machining of this material is extremely difficult. Even if diamond tools are used, the processing cost is very high due to severe tool wear, low efficiency, and long cycle time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: The high-volume particle-reinforced metal matrix composite material selected in this example is silicon carbide (SiC) particle-reinforced aluminum-matrix composite material. The nominal size of SiC particles is 63 μm, and the volume fraction of particles in the composite material is 55. %, the base alloy is Al-Si-Mg aluminum alloy, and the complete melting temperature of the alloy is 600°C. Cut the composite material billet of appropriate size according to the needs, heat it to 850°C (that is, 250°C higher than the complete melting temperature of the matrix alloy) and keep it warm for 30min, use a press to 5×10 -4 the s -1 Reverse extrusion deformation at a certain strain rate to obtain a cup-shaped composite part blank.

Embodiment 2

[0016] Example 2: The high-volume particle-reinforced metal matrix composites selected in this example are silicon carbide (SiC) particles, aluminum oxide (Al 2 o 3 ) particle hybrid reinforced aluminum matrix composite material, the nominal size of the SiC particle in the composite material is 75 μm, and the nominal size of the alumina particle is 17.3 μm. The total volume fraction is 65%, the base alloy is Al-Si-Mg aluminum alloy, and the complete melting temperature of the alloy is 600°C. Cut the composite material billet of appropriate size according to the needs, heat it to 900°C (that is, 300°C higher than the complete melting temperature of the matrix alloy) and keep it warm for 120min, then use a press to 1×10 -4 the s -1 Compressive deformation at a certain strain rate to obtain a composite part blank of a specific shape.

Embodiment 3

[0017] Example 3: The high-volume particle-reinforced metal matrix composite material selected in this example is alumina (Al 2 o 3 ) particle reinforced aluminum matrix composites, Al 2 o 3 The nominal size of the particles is 12.8 μm, the volume fraction of the particles in the composite material is 45%, the matrix alloy is LY12 duralumin, and the complete melting temperature of the alloy is 638°C. According to the needs, cut the composite material billet of appropriate size, heat it to 838°C (that is, 200°C higher than the complete melting temperature of the matrix alloy) and keep it warm for 300min, then use a forging bed to 1×10 -2 the s -1 Forging and pressing at a certain strain rate to obtain a composite part blank of a specific shape.

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Abstract

The invention belongs to the field of metal-based composite materials, and relates to a pseudo-plastic forming method for high-volume-fraction particle-reinforced metal-based composite materials. The method comprises the following operation steps: selecting composite material blank; preheating the composite material blank; and pressurizing and deforming viscous fluid of the composite material blank at the temperature. The method obtains the shape of high-volume-fraction metal-based composite-material parts through pseudo-plastic forming at high temperature much higher than the temperature of conventional pressure machining processes, and avoids the technical problem that cast forming or conventional plastic processing cannot be performed on high-volume-fraction ceramic particle-reinforced metal-based composite materials, thereby greatly reducing the amount of follow-up product machining, improving the production efficiency of products and reducing cost.

Description

technical field [0001] The invention belongs to the field of metal-matrix composite materials, and relates to a pseudoplastic forming method for high-volume particle-reinforced metal-matrix composite materials. Background technique [0002] High-volume ceramic particle-reinforced metal matrix composites (especially silicon carbide particle-reinforced aluminum-matrix composites) with low expansion, high thermal conductivity, high specific modulus (specific stiffness), and high wear resistance are used in aviation, aerospace, electronics, Military industry and other fields have broad application prospects. Taking high-volume (55%) silicon carbide particle-reinforced aluminum matrix composites as an example, its specific modulus can reach three times that of aluminum alloy, its thermal expansion coefficient is less than 40% of that of aluminum alloy, and its average resonance frequency is also lower than that of aluminum alloy. Much higher (at least 60% higher) and higher ther...

Claims

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Application Information

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IPC IPC(8): B21J5/00
Inventor 崔岩任学平
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS