Gradient aluminum-based composite material capable of resisting multi-angle penetration of 7.62 mm armor-piercing bullet and preparation method of gradient aluminum-based composite material

The invention relates to a gradient aluminum-based composite material resistant to multi-angle penetration of a 7.62 mm armor-piercing bullet and a preparation method of the gradient aluminum-based composite material. The gradient aluminum-based composite material resistant to multi-angle penetration of the 7.62 mm armor-piercing bullet and the preparation method of the gradient aluminum-based composite material resistant to multi-angle penetration of the 7.62 mm armor-piercing bullet. The invention aims to solve the problems of high brittleness of a ceramic composite armor structure and poor multi-angle penetration resistance of a ceramic particle reinforced aluminum-based composite material with a homogeneous structure. The composite material is composed of 3-20 layers of ceramic particle reinforced aluminum matrix composite materials, the ceramic volume fraction from a face plate to a back plate is in 100-0% gradient change, the volume fraction is in a linear or power exponent change rule in thickness, and