Intragranular distribution reinforcement composite material powder and preparation and forming methods thereof

Abstract

The invention discloses intragranular distribution reinforcement composite material powder and preparation and forming methods thereof. The composite material powder comprises metal matrix powder and reinforcements, the metal matrix powder can be deformed into flaky powder through a ball milling process, and the reinforcements are nanometer one-dimensional and two-dimensional reinforcements. The deformation process of metal matrix powder is controlled through a high-energy ball milling method, the deformation state of the powder is judged according to the powder morphology in the ball milling process, and when the powder is in a flaky state, the reinforcements gradually enter crystal grains, so that composite material powder with the reinforcements distributed in the crystal grains is obtained; and taking intracrystalline carbon nanotube reinforced aluminum-based composite material powder as an example, the oxygen content of the prepared intracrystalline dispersed CNTs / Al composite material powder is 0.70%, the intracrystalline dispersed CNTs are uniform and free of obvious agglomeration, the strength of the obtained intracrystalline dispersed CNTs / Al composite material is improved by 5.7% compared with that of a grain boundary dispersed CNTs / Al composite material, and the ductility is improved by 36.4%.

Description

technical field [0001] The invention belongs to the technical field of preparing carbon nanotube aluminum-based composite materials by powder metallurgy, and in particular relates to a composite material powder of intragranular distribution reinforcing body and a preparation and forming method thereof. Background technique [0002] Metal matrix composites have become a new material at home and abroad due to their plasticity, electrical and thermal conductivity, specific strength, and corrosion resistance of the metal matrix, as well as the low density, ultra-high strength and modulus, and excellent electrical and thermal conductivity of the reinforcement. One of the research hotspots. Among them, the powder metallurgy method is one of the important methods for preparing metal matrix composites. The reason is that its forming temperature is lower than the melting point of the material, and it is easy to control the interface bonding state between the reinforcement and the mat...

AI Technical Summary

Problems solved by technology

However, the ball milling process is extremely complicated, and the ideal intragranular dispersed CNTs / Al powder is the result of the comprehensive optimization design of the ball-material ratio, process control agent content, ball milling time, oxygen content and other factors in the ball milling process.

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