METHOD OF PRODUCING MULTILAYER METAL SHEETS WITH SUB MICRO- AND NANO-SIZED STRUCTURE Russian patent published in 2011 - IPC B23K20/22 B32B15/01 B82B3/00 

FIELD: process engineering.

SUBSTANCE: invention may be used for producing multilayer metal sheets with sub micro- and nano-sized structure. Initial workpiece represent sheets from alloys based on one metal that feature different structure of crystal lattice at normal conditions. First of said alloys has stable crystal lattice in the entire range of temperatures at hot forming while second alloy undergoes amorphous conversion in hot forming range with formation of crystal lattice corresponding to that of first alloy. In assembly, sheets from first and second alloys are alternated in turns. Produced stack is subjected to evacuation and hot forming by heating and deforming over the height to produce multilayer sheet. Selection of alloy composition is subject to blocking of diffusion mobility of the most active alloying element. In compliance with another version, alloy that suffers polymorphous conversion is selected with due allowance for hardening phase presence with dissolution temperature exceeding that of its polymorphous conversion.

EFFECT: producing multilayer metal sheets with submicro- and nano-sized structure.

3 cl, 1 dwg, 2 ex