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Aluminum-based composite material and preparation method thereof

An aluminum-based composite material and bar 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, accelerating grain refinement, and reducing stress concentration.

Active Publication Date: 2021-01-05
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Aluminum-based composite material and preparation method thereof
  • Aluminum-based composite material and preparation method thereof

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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-based composite material and a preparation method thereof. A tissue structure of the aluminum-based composite material is composed of ultrafine grains, nano SiC particles and a nano precipitated phase. The specific preparation method comprises the following steps of mixing nano SiC and aluminum alloy powder; carrying out high-energy ball milling to reach an ultrafine grain level to realize uniform dispersion of the nano-particle powder; preparing the mixed powder into a blocky sample through spark plasma sintering; heating the blocky sample, carrying out hot extrusion under a certain pressure intensity and extrusion ratio, and solidifying to obtain a full-compact aluminum-based composite material bar; and conducting T6 heat treatment on the extruded aluminum-based composite material bar, wherein in the process, coarse precipitated phase dissolution occurs, and fine and evenly-dispersed nano precipitated phases are separated out. The ultrafine-structure nano aluminum-based composite material prepared by the method provided by the invention 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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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 JIAO TONG UNIV
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