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Manufacturing method of metal matrix nanocomposites with high toughness

A nanocomposite material and composite material technology are applied in the field of preparation of high-strength and tough metal-based nanocomposite materials, which can solve the problems of large average size of reinforcements, reduce material plasticity and toughness, and affect material properties, and achieve overcoming segregation and scale. Inhomogeneity, the effect of improving synchronization and speed, and improving mixing uniformity

Inactive Publication Date: 2012-08-01
泰州赛龙电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Metal matrix composites have the advantages of high specific strength, specific stiffness, low thermal expansion coefficient, and low cost, and have broad application prospects in the automotive industry, aerospace, and military industries; however, the introduction of reinforcements seriously reduces the material's Plasticity and toughness, which limit its practical application
[0003] The performance of metal matrix composites is closely related to the properties of the reinforcement (type, shape, size and distribution), the reinforcement-metal matrix interface structure, and the microstructure of the matrix; the introduction of reinforcement mainly includes external addition and in-situ self-generation. Two, compared with the former, the reinforcement obtained by the latter has better compatibility with the matrix, which has become a hot spot in the research of metal matrix composites in recent years; TM In-situ reaction generation method, combustion synthesis, reaction spray deposition and other in-situ preparation methods; however, the average size of reinforcements generated by most of the existing methods is relatively large, and the size distribution is not uniform, which seriously affects the improvement of material properties , compared with coarse-grained reinforcements, nanoscale reinforcements can better match the strength and toughness of metal matrix composites. Therefore, controlling the size of reinforcements is an important factor for the preparation of high-strength and tough composites. In addition to reinforcements, now The matrix microstructure of the metal matrix composites prepared by the preparation method is also relatively coarse, which cannot effectively obtain a good match between strength and toughness. It can be seen that obtaining ultrafine-grained metal matrix composites reinforced by in-situ self-generated nanoparticles is at the same time An Effective Way to Realize High Strength and High Toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) will be 50 m metal Ti powder with 30 m The non-metallic C powder is mixed according to the atomic ratio of 1:1, and ball milled for 1 hour in an Ar gas atmosphere with a high-energy ball mill. ;

[0025] 2) Mix the uniformly mixed powder capable of generating the reinforcing phase with 100 The metal Mg matrix powder is mixed by ball milling under vacuum at a mass ratio of 1:4, the ball-to-material ratio is 12:1, the rotation speed is 220r / min, and the ball milling time is 3h, to obtain a uniformly mixed composite powder;

[0026] 3) Compress the uniform composite powder under 120MPa;

[0027] 4) Place the green compact in a spark plasma sintering device, heat it at 150°C / min to 1000°C, and sinter it under vacuum for 5min under a pressure of 30MPa to obtain an in-situ self-generated nanoparticle-reinforced metal matrix composite;

[0028] 5) The nanoparticle-reinforced metal matrix composite was subjected to 4-pass equal-channel angular extrusion and large-stra...

Embodiment 2

[0031] 1) Divide 100 m metal W powder with 80 m The non-metallic SiC powder is mixed according to the atomic ratio of 1:1, and ball milled for 3 hours in an Ar gas atmosphere with a high-energy ball mill. ;

[0032] 2) Mix the uniformly mixed powder capable of generating the reinforcing phase with 80 m The metal Al matrix powder is mixed by ball milling under vacuum at a mass ratio of 1:2, the ball-to-material ratio is 20:1, the rotation speed is 200r / min, and the ball milling time is 1h to obtain a uniformly mixed composite powder;

[0033] 3) Compress the uniform composite powder under 350MPa;

[0034] 4) Place the green compact in a spark plasma sintering device, heat it at 50°C / min to 850°C, and sinter it under vacuum for 30min at a pressure of 5MPa to obtain an in-situ self-generated nanoparticle-reinforced metal matrix composite;

[0035] 5) The nanoparticle-reinforced metal matrix composite was subjected to large-strain plastic deformation by one-pass equal-chann...

Embodiment 3

[0038] 1) put 1 m metal compound TiO 2 powder with 0.1 m The non-metallic SiC powder is mixed according to the atomic ratio of 1:1, and ball milled for 1.5 hours in an Ar gas atmosphere with a high-energy ball mill. powder;

[0039] 2) Mix the uniformly mixed powder capable of generating a reinforcing phase with 0.1 m The metal Ni matrix powder is mixed by ball milling under vacuum at a mass ratio of 1:20, the ball-to-material ratio is 10:1, the rotating speed is 300r / min, and the ball milling time is 2h to obtain a uniformly mixed composite powder;

[0040] 3) Compress the uniform composite powder under 200MPa;

[0041] 4) Place the green compact in a spark plasma sintering device, heat it at 100°C / min to 950°C, and sinter it under vacuum for 10min at a pressure of 25MPa to obtain an in-situ self-generated nanoparticle-reinforced metal matrix composite;

[0042] 5) The nanoparticle-reinforced metal matrix composite was subjected to 10-pass equal-channel angular extrus...

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Abstract

The invention relates to the composite technical field, in particular to a manufacturing method of metal matrix nanocomposites with high toughness. According to the manufacturing method, the size, distribution, interface structure of reinforcement bodies and the metal matrix micro-structure are effectively controlled by the combined composite process of twice ball-milling, discharging plasma in situ reaction sintering and the large strain plastic deformation technology, so that ultra-fine grain metal matrix composites with evenly distributed in situ authigenic nanoparticles and good interface combination are manufactured, and good matching of intensity and toughness is obtained.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a preparation method of a high-strength and tough metal-based nanocomposite material. Background technique [0002] Metal matrix composites have the advantages of high specific strength, specific stiffness, low thermal expansion coefficient, and low cost, and have broad application prospects in the automotive industry, aerospace, and military industries; however, the introduction of reinforcements seriously reduces the material's Plasticity and toughness limit its practical application. [0003] The performance of metal matrix composites is closely related to the properties of the reinforcement (type, shape, size and distribution), the reinforcement-metal matrix interface structure, and the microstructure of the matrix; the introduction of reinforcement mainly includes external addition and in-situ self-generation. Two, compared with the former, the reinfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C32/00C22C1/05
Inventor 崔熙贵崔承云程晓农许晓静
Owner 泰州赛龙电子有限公司
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