Shishkin A. Reactivity of multilayer foils and their deformational behaviour at heating under the conditions of continuously applied loads

It is shown for the first time that at heating under the conditions of continuously applied tensile loads MF develop plastic strain, the degree of which changes non-monotonically with temperature. It is established that there exist two temperature intervals of intensive plastic strain: high-temperature and low-temperature. Low-temperature interval is related to transformational superplasticity, which is due to phase transformations, and high-temperature interval - to structural superplasticity accompanied by considerable changes of foil microstructure. In the case of difficult-to-deform alloy Al + 5 wt.%Mg strengthened by Al2O3 particles it is shown that temperature conditions required to make permanent joints of composite material by pressure welding through an interlayer based on Al/Cu MF, correlate with temperatures, at which realization of structural superplasticity is possible in such foils.