The invention provides a preparation method of a high-
toughness metal-based nanometer
composite material and belongs to the technical field of composite materials. The preparation method provided by the invention comprises the following steps of: firstly, using an
atmosphere heat treatment process, generating a layer of a nanometer
ceramic thin film on the sheet-shaped
metal powder through reaction in-situ; and then carrying out densifying treatment by using a
powder metallurgical process, so as to obtain the large compact
metal-based
composite material. The metal-based
composite material prepared by the invention has a metal /
ceramic alternative laminated structure, wherein a
ceramic layer can be used for effectively restraining the reply of a metal layer and the
crystal grain growth, improving the high-position wrong storage capability, keeping a nanometer
crystal matrix structure, and causing the rotation and inactivation of fissures, so as to realize mechanical properties matched with the high
toughness. The preparation method provided by the invention is simple, convenient and practicable, can be used for realizing the
macro-quantized preparation of the large-size composite material, and is good for prompting
engineering applications of the metal-based nanometer composite material.