J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 965-970
Dynamic deformation and failure behaviour of Al-Sc alloy under shear loadingW.S. Lee1, C.F. Lin2 and Y.C. Lin1
1 Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan
2 National Center for High-Performance Computing, Hsin-Shi Tainan County 744, Taiwan
Published online: 26 July 2006
The dynamic shear deformation behaviour and fracture characteristics of Al-Sc alloy are studied using a split-Hopkinson torsional bar at shear strain rates of 800 s-1, 1800 s-1 and 2800 s-1 and temperatures of -150C, 25C and 300C. The experimental results indicate that the shear strain, shear strain rate and temperature all have a significant influence on the mechanical properties of the alloy. The fracture surfaces of the gauge length section of the deformed specimen are twisted into band-like features as a result of intensive localized shear deformation. The width and microhardness of the shear band changes with strain rate and temperature as a result of different work hardening effects. Specimen fracture initiates at the Al3Sc precipitate/matrix interface. The presence of precipitates accelerates the dynamic shear fracture formation via microcracking.
© EDP Sciences 2006