Finite element method was employed to simulate the effects of friction on the equal channel angular pressing of single pass for high-strength aluminum alloy.The results indicate that with increasing in frictional coefficient

the deformed loading and applied forces are increased

and heterogeneity of strain in core is more and more serious

however

average equilibrium strain of the alloy remains a basically steady value.Loading-displacement curves are divided into five stages:rapid-increment

stable stage

rapid increment

stable stage and rapid decrement.With increasing in frictional coefficient from 0 to 0.3

the maximum loading is increased by 2.1 times with applied force increased by 1.3 times.So during ECAP

it should be considered that clean inner-wall surface for the mould

rational lubricant agent are included to decrease friction and loading to improve grain size and homogeneity of the microstructure in the alloy.