TY - GEN
T1 - Fatigue fracture mechanism of extruded Al alloy 7075-T6 in high humidity
AU - Kariya, K.
AU - Kawagoishi, N.
AU - Maeda, H.
AU - Chen, Qiang
AU - Goto, M.
AU - Nu, Y.
PY - 2012/1/1
Y1 - 2012/1/1
N2 - Effect of high humidity on growth mechanism of a fatigue crack was investigated for an extruded bar of an age-hardened Al alloy 7075-T6 which had the marked texture of plane (111). Fracture in high humidity occurred by the growth of a shear mode crack under high stress levels, though a crack propagated in a tensile mode under low stress ones, macroscopically. Many voids and slip planes were observed on the fracture surface yielded by the shear mode crack. Especially most of the fracture surface was occupied by voids where the crack was small. The void percentage decreased with increasing in the crack depth. Fracture surface yielded by the shear mode crack was a plane (100). The growth direction of the shear mode crack to the cross section of specimen was about 55° corresponding to the angle composed by this plane and the texture of plane (111). These results suggest that the shear mode crack was related to microstructure, stress and environment. The growth mechanism of the shear mode crack assisted by hydrogen was proposed based on the results of the acceleration of crack growth and the formation of voids in high humidity.
AB - Effect of high humidity on growth mechanism of a fatigue crack was investigated for an extruded bar of an age-hardened Al alloy 7075-T6 which had the marked texture of plane (111). Fracture in high humidity occurred by the growth of a shear mode crack under high stress levels, though a crack propagated in a tensile mode under low stress ones, macroscopically. Many voids and slip planes were observed on the fracture surface yielded by the shear mode crack. Especially most of the fracture surface was occupied by voids where the crack was small. The void percentage decreased with increasing in the crack depth. Fracture surface yielded by the shear mode crack was a plane (100). The growth direction of the shear mode crack to the cross section of specimen was about 55° corresponding to the angle composed by this plane and the texture of plane (111). These results suggest that the shear mode crack was related to microstructure, stress and environment. The growth mechanism of the shear mode crack assisted by hydrogen was proposed based on the results of the acceleration of crack growth and the formation of voids in high humidity.
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U2 - 10.4028/www.scientific.net/KEM.488-489.45
DO - 10.4028/www.scientific.net/KEM.488-489.45
M3 - Conference contribution
AN - SCOPUS:80053985525
SN - 9783037852187
T3 - Key Engineering Materials
SP - 45
EP - 48
BT - Advances in Fracture and Damage Mechanics X
T2 - 10th International Conference on Fracture and Damage Mechanics, FDM2011
Y2 - 19 September 2011 through 21 September 2011
ER -