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Method for preparing nano-particle dispersed ultrafine grain metal matrix nano composite

A nano-composite material and nano-particle technology, which is applied in the field of preparation of ultra-fine-grained metal-based nano-composite materials, can solve the limitation of large plastic deformation process, multiple rolling and extrusion process, extremely insufficient metal flow, and multi-pass processing. Small quantity and other problems, to achieve the effect of improving casting defects, improving casting defects, and improving yield

Inactive Publication Date: 2015-09-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the large plastic deformation process is limited to multiple rolling and extrusion processes, the amount of processing in each pass is small, the metal flow is extremely insufficient, and at the same time, the processing efficiency is low, and it is difficult to promote it in the actual industrial production process
The Chinese invention patent with the publication number CN103572186A, the name of the invention: a method for preparing ultra-fine-grained titanium-based composite materials by deformation of equal-diameter curved channels. , however, the yield of this method is low, and it is difficult to popularize and apply

Method used

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  • Method for preparing nano-particle dispersed ultrafine grain metal matrix nano composite
  • Method for preparing nano-particle dispersed ultrafine grain metal matrix nano composite
  • Method for preparing nano-particle dispersed ultrafine grain metal matrix nano composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、1

[0031] Preparation of embodiment 1, 1.0wt% n-SiCp / pure Mg composite material

[0032] Pure Mg (99.93%) is used as the matrix, and 50nm β-SiC particles are used as the reinforcement. After the magnesium melt is completely melted at 700°C, keep it warm for 1 hour, turn on the mechanical stirring device, add nano-SiC particles preheated at 500°C into the melt (molten magnesium metal liquid), and at the same time, treat the melt with high-energy ultrasonic for 15 minutes. Then, the melt was raised to 725°C for casting. The preheating temperature of the metal mold is 350°C, and the melting process uses CO 2 +SF 6 Mixed gas as shielding gas. A reciprocating extrusion billet with geometric dimensions of Φ30mm×42mm was cut out from the ingot, and solution treated at 413°C for 24h. After the heat treatment is completed, a reciprocating extrusion die is used to carry out 8 passes of reciprocating extrusion at 350°C for large plastic deformation. figure 2 a shows n-SiCp nanoparti...

Embodiment 2、0

[0033] Example 2, Preparation of 0.5wt% n-SiCp / AZ91D magnesium-based composite material

[0034] AZ91D cast magnesium alloy is used as the matrix, and 40nm β-SiC particles are used as the reinforcement. After the magnesium alloy melt is completely melted at 630°C, keep it warm for 1 hour, turn on the mechanical stirring device, add nano-SiC particles preheated at 500°C into the magnesium alloy melt (melting AZ91D magnesium alloy liquid), and at the same time, high-energy ultrasonic treatment Melt 15min. Then, the melt is raised to 650-660°C for casting. The preheating temperature of the metal mold is 300°C, and the melting process uses CO 2 +SF 6 Mixed gas as shielding gas. A repeatedly upsetting billet with a geometric size of 100mm×100mm×20mm was cut from the ingot, and was subjected to solution heat treatment at 413°C for 24h. After the heat treatment is completed, use the repeated upsetting mold to perform 2 times of repeated upsetting and large plastic deformation ...

Embodiment 3、15

[0035] Example 3, Preparation of 1.5wt% n-SiCp / AZ91D magnesium-based composite material

[0036] AZ91D cast magnesium alloy is used as the matrix, and 40nm β-SiC particles are used as the reinforcement. After the magnesium alloy melt is completely melted at 630°C, keep it warm for 1 hour, turn on the mechanical stirring device, add nano-SiC particles preheated at 500°C into the magnesium alloy melt (melting AZ91D magnesium alloy liquid), and at the same time, high-energy ultrasonic treatment Melt 15min. Then, the temperature of the melt is raised to 650-660° C. for casting. The preheating temperature of the metal mold is 300°C, and the melting process uses CO 2 +SF 6 Mixed gas as shielding gas. A repeatedly upsetting billet with a geometric size of 100mm×100mm×20mm was cut from the ingot, and was subjected to solution heat treatment at 413°C for 24h. After the heat treatment is completed, use the cyclic closed die forging die to carry out 4 passes of cyclic closed die f...

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Abstract

The invention discloses a method for preparing a nano-particle dispersed ultrafine grain metal matrix nano composite. The method comprises the following steps: adding nano-particles into a molten metal or an alloy solution through conventional stirring to enable the nano-particles to be dispersed in the whole melt; meanwhile, adopting the high-intensity ultrasonic method to disperse locally clustered or segregated nano-particles to produce nano-particle reinforced metal matrix composite ingots; conducting multi-pass repeated compression severe plastic deformation on the produced nano-particle reinforced metal matrix composite to thin the matrix structure and uniformly disperse the locally clustered and segregated nano-particles, and meanwhile, preventing casting defects to finally obtain the nano-particle dispersed ultrafine grain metal matrix nano composite of which the reinforcement phase is distributed in a uniformly dispersed manner and the matrix structure is thinned. The invention solves the problem of clustering or local segregation of nano-particles in the nano-particle reinforced metal matrix composite, the matrix ultrafine grain structure is controlled while the nano reinforcement phase is distributed in a dispersed manner, and the material toughness is improved.

Description

technical field [0001] The invention belongs to the field of preparation of ultrafine-grained metal-based nanocomposite materials, and in particular relates to a preparation method of ultrafine-crystalline metal-based nanocomposite materials in which nanoparticles are dispersed. Background technique [0002] Metal matrix composites combine the good ductility and toughness of the metal matrix with the high strength, high hardness and high thermal stability of the reinforcement, and have broad application space in many important engineering fields (such as automobile industry, aerospace industry, etc.). When using the liquid phase method to prepare metal matrix nanocomposites, it is difficult to add nanoparticles due to their high surface energy and poor wettability with metal or alloy liquid; the van der Waals force between nanoparticles makes it easy to agglomerate; at the same time, the prepared composite material Coarse grains and obvious casting defects. Therefore, how t...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C32/00C22F1/00
Inventor 王渠东张利周浩
Owner SHANGHAI JIAO TONG UNIV
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