METHOD FOR PREPARING ULTRA-FINE GRAIN ALUMINUM ALLOY AND COMPOSITE MATERIAL THEREOF

摘要

A method for preparing an ultra-fine grain aluminum alloy and a composite material thereof comprises the steps: first processing the aluminum alloy or aluminum-based composite material to a plate, then abutting the plate against a block material (5) having a certain thickness and a same material with the plate, heating the plate with a pressed friction heating part (2) under pressure, and heating the plate and the block material (5) to an assigned temperature, subsequently introducing a rotating stirring rod (3) between the plate and the block material (5), stirring with pressing, simultaneously moving the friction heating part (2) and the stirring rod (3) from one end of the plate to the other end of the plate until the stirring rod (3) is moved out of the material; and then abutting another plate having a same material with the plate against the larger face of the above plate, repeating the above steps to realize connection, continuously connecting new plates until a required thickness is reached, and removing the initial block material (5) to obtain a fine grain block material.