Determination of pressurizing rate during hot gas forming with integrated heat treatment of Al–Cu–Li alloy: deformation and strengthening behaviors

摘要: Hot gas forming with an integrated heat treatment was utilized to form complex-shaped components in one operation that obtain full strength. The effects of the pressurizing rate on deformation and strengthening behaviors were critical. Free-bulging tests conducted at different rates (0.0088–2.37 MPa/s) reveal corresponding Al–Cu–Li alloy sheet for choosing appropriate conditions. profile thickness analyzed describe behaviors. Vickers hardness under conditions measured evaluate behavior. microstructure evolution observed mechanisms. An excellent bulging ability obtained solution condition, a maximum strain 0.88 0.034 MPa/s. distribution became more uniform rapid because increasing strain-rate hardening abilities. increased not affected by rate. Dynamic recovery main mechanism, dynamic recrystallization occurred low Fine precipitates comprising T1 phase (Al2CuLi, hexagonal structure) phase. condition only considered improvement formability microstructure, regardless its effect during hot treatment.