Reinforced intragranular aluminum matrix composites with nano ceramic particles added externally and preparation process thereof

Abstract

The invention relates to reinforced intragranular aluminum matrix composites with nano ceramic particles added externally and a preparation process thereof. According to composites and the preparation process, the problems that particle sizes of nano particle reinforced aluminum matrix composites prepared by an existing in-situ method is hard to be controlled within the nanoscale range and nano particle reinforced aluminum matrix composites prepared by an existing external addition method are grain-boundary type nano particle reinforced aluminum matrix composites and low in strength and plasticity are solved. The preparation process comprises 1, weighing out constituents, and adding stearic acid which accounts for 0.6-8% of the gross mass to conduct ball milling; 2, conducting vacuum hot pressed sintering to form blocks after ball milling; and 3, conducting hot extrusion deformation on blocks to obtain nano ceramic particle reinforced aluminum matrix composites. Composites prepared bythe process are high in strength and good in plasticity. Composites and the preparation process are applicable to the field of preparation of aluminum matrix composites.

Description

Technical field [0001] The invention relates to a ceramic particle reinforced aluminum-based composite material and a preparation method thereof. Background technique [0002] Nano ceramic particles (such as SiC, SiO 2 , MgO, TiB 2 , Al 2 O 3 , Si 3 N 4 And TiC) reinforced aluminum matrix composite materials are getting extensive attention and research due to their excellent mechanical properties. Generally, the preparation methods of nanoparticle-reinforced aluminum-based composites include in-situ methods and external addition methods. However, although the in-situ method can obtain intragranular reinforcing phases, due to the fast reaction speed and high temperature, it is difficult to control the particle size of the in-situ synthesized particles within the nanometer range, and the in-situ method can only synthesize a limited variety of ceramics. Particles. [0003] Generally speaking, nanoparticles can be distributed inside crystal grains or on grain boundaries. Due to their...

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Problems solved by technology

[0004] The present invention aims to solve the problem that the particle size of the nanoparticle-reinforced aluminum-based composite material prepared by the existing in-situ method is difficult to control within the nanoscale range and that the nanoparticle-reinforced aluminum-based composite material prepared by the existing external method is all of the grain boundary type Nanoparticle-reinforced aluminum-matrix composite materials have problems of low strength and plasticity, and provide a kind of nano-ceramic particle-reinforced intragranular aluminum-matrix composite material and its preparation method

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