The effects of aging treatments on the tensile properties and compressive behavior of a thin-walled 6005 aluminum alloy tube were studied.Samples after three natural aging(NA)conditions were subsequently aged at 180℃...The effects of aging treatments on the tensile properties and compressive behavior of a thin-walled 6005 aluminum alloy tube were studied.Samples after three natural aging(NA)conditions were subsequently aged at 180℃ for 0.5−12.0 h artificial aging(AA).Tensile and compressive tests were performed after AA.The results show that for samples with the same NA,the longer the AA time is,the higher the strengths alloy owns,and at the same time the material shows a much lower elongation and faster process from plastic deformation to fracture.However,with NA prolonging,the alloy exhibits much better plastic deformation ability after AA,though its strength is decreased.The major cause of strength and plasticity variation induced by changing NA time is that the size of the main strengtheningβ''precipitates is larger and the density is lower.This character is evaluated by the strain hardening exponent n.Compressive results show that the optimum energy absorption characteristics can be acquired at a moderate n(14<n<17).Large n(n≥18)results in the fracture of tube during axial compression while low n(n≤13)causes lower energy absorption.展开更多
The flow stress behavior of Cu13Zn alloy was investigated by compression tests carried out at 650 ℃, 700 ℃, 750 ℃, 850 ℃, and constant strain rates of 0.05 s -1 , 0.1 s -1 , 0.5 s -1 , 1 s -1 , 5 s -1 , respective...The flow stress behavior of Cu13Zn alloy was investigated by compression tests carried out at 650 ℃, 700 ℃, 750 ℃, 850 ℃, and constant strain rates of 0.05 s -1 , 0.1 s -1 , 0.5 s -1 , 1 s -1 , 5 s -1 , respectively. The results show that the flow stress increases with the increase of strain and reaches a steady state stress, and the saturated stress ( σ s) increases with the increase of the strain rate and the decrease of temperature. Flow stress curves of the alloy deformed at elevated temperatures can be simulated effectively by the model proposed by Zhou and Clode, and the flow stress is described as a function of strain, strain rate and temperature. Material constants values are: Q =270.43 kJ/mol, α =0.020 94, A =1.747×10 11 s -1 and n = 3.549 mm 2·N -1 , the deformation mechanisms of the alloy are self diffusion and dynamic recovery.展开更多
基金Project(2019JJ50054)supported by the Natural Science Foundation of Hunan Province,ChinaProjects(51975201,U1664252)supported by the National Natural Science Foundation of China。
文摘The effects of aging treatments on the tensile properties and compressive behavior of a thin-walled 6005 aluminum alloy tube were studied.Samples after three natural aging(NA)conditions were subsequently aged at 180℃ for 0.5−12.0 h artificial aging(AA).Tensile and compressive tests were performed after AA.The results show that for samples with the same NA,the longer the AA time is,the higher the strengths alloy owns,and at the same time the material shows a much lower elongation and faster process from plastic deformation to fracture.However,with NA prolonging,the alloy exhibits much better plastic deformation ability after AA,though its strength is decreased.The major cause of strength and plasticity variation induced by changing NA time is that the size of the main strengtheningβ''precipitates is larger and the density is lower.This character is evaluated by the strain hardening exponent n.Compressive results show that the optimum energy absorption characteristics can be acquired at a moderate n(14<n<17).Large n(n≥18)results in the fracture of tube during axial compression while low n(n≤13)causes lower energy absorption.
文摘The flow stress behavior of Cu13Zn alloy was investigated by compression tests carried out at 650 ℃, 700 ℃, 750 ℃, 850 ℃, and constant strain rates of 0.05 s -1 , 0.1 s -1 , 0.5 s -1 , 1 s -1 , 5 s -1 , respectively. The results show that the flow stress increases with the increase of strain and reaches a steady state stress, and the saturated stress ( σ s) increases with the increase of the strain rate and the decrease of temperature. Flow stress curves of the alloy deformed at elevated temperatures can be simulated effectively by the model proposed by Zhou and Clode, and the flow stress is described as a function of strain, strain rate and temperature. Material constants values are: Q =270.43 kJ/mol, α =0.020 94, A =1.747×10 11 s -1 and n = 3.549 mm 2·N -1 , the deformation mechanisms of the alloy are self diffusion and dynamic recovery.
