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A kind of aluminum matrix composite material and preparation method thereof

An aluminum-based composite material and aluminum alloy technology, applied in the field of powder metallurgy, can solve the problems of grain boundary or phase interface nucleation and growth, and achieve the effects of improving density, eliminating coarse precipitates and eliminating defects

Active Publication Date: 2022-04-08
SHANGHAI JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the precipitation behavior of ultrafine-grained nanocomposites is affected by a large number of grain boundaries and phase interfaces, and it is easy to nucleate and grow at grain boundaries or phase interfaces. How to control the size and distribution of precipitated phases is still a challenge

Method used

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  • A kind of aluminum matrix composite material and preparation method thereof
  • A kind of aluminum matrix composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Weigh 1.8g (3vol.%) of SiC powder, 48.2g of Al-Zn-Mg-Cu aluminum alloy powder and 450g of steel balls and put them into a ball mill jar, the mass ratio of balls to materials is 9:1, and then add 0.5g of Stearic acid, vacuum-dried at 60°C for 2 hours and sealed with inert gas.

[0032] Mix powder at 200rpm for 2h first, then high-energy ball mill at 500rpm for 24h, and stop for 30min every 3h during the high-energy ball milling process. The powder was then spark plasma sintered at 500 °C for 5 min at a pressure of 50 MPa. The sintered block is simply ground and polished to remove the graphite and oxide layer on the surface. Heat the processed block sample, then move the heated block sample into a preheated extrusion die, keep it at 500°C for 5 minutes, and then extrude it at a pressure of 800-1000 MPa.

[0033] Finally, heat treatment was performed on the prepared nanocomposite material. The sample wrapped in aluminum foil was solid-dissolved at 490°C for 2 hours, then...

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Abstract

The invention discloses a nano SiC particle reinforced aluminum matrix composite material and a preparation method thereof. The microstructure of the aluminum-based composite material is composed of ultra-fine grains, nano-SiC particles and nano-precipitated phases. The specific preparation method includes the following steps: mixing nano-SiC and aluminum alloy powder; Uniform dispersion of nanoparticle powder; the mixed powder is made into a block sample by spark plasma sintering; the block sample is heated, and hot-extruded under a certain pressure and extrusion ratio, and consolidated to obtain a fully dense aluminum matrix composite material Rods: The extruded aluminum-based composite rods are subjected to T6 heat treatment, during which the dissolution of coarse precipitates and the precipitation of fine and uniformly dispersed nano-precipitates occur. The invention prepares the ultra-fine structure nano-aluminum matrix composite material, which has the advantages of high strength and high elongation.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to an aluminum-based composite material reinforced by nano-SiC particles and a preparation method thereof. Background technique [0002] Aluminum matrix composites (Aluminum matrix composites, AMCs) are known as new materials in the 21st century, among which particle reinforced aluminum matrix composites are the fastest researched and developed. Due to its ability to balance mechanical and physical properties, excellent tribological properties and high temperature strength, it shows incomparable performance of a single aluminum alloy material, and has become a research hotspot at home and abroad. It is used in aerospace, automobiles, electronic packaging, and sports equipment. There are broad application prospects in other fields. [0003] It is desirable to make lightweight materials that combine high strength with good plasticity, but strength and plasticity are usually mutually ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C21/00C22C32/00C22F1/04B22F9/04B22F3/105B22F3/24B22F3/20
CPCC22C1/05C22C21/00C22C32/0063C22F1/04C22F1/002B22F9/04B22F3/105B22F3/24B22F3/20B22F2009/043B22F2003/1051B22F2003/248B22F2998/10B22F2003/208
Inventor 王俊李京京梁加淼鞠江张震罗逸飞王朦朦谢跃煌穆迪琨祺
Owner SHANGHAI JIAOTONG UNIV
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