Dynamic deformation and failure behaviour of Al-Sc alloy under shear loading

W.S. Lee; C.F. Lin; Y.C. Lin

doi:doi:10.1051/jp4:2006134147

Issue		J. Phys. IV France Volume 134, August 2006 EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading


Page(s)		965 - 970
DOI		https://doi.org/10.1051/jp4:2006134147
Published online		26 July 2006

EURODYMAT 2006 - 8th International Conference on Mehanical and Physical Behaviour of Materials under Dynamic Loading
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 965-970
DOI: 10.1051/jp4:2006134147

Dynamic deformation and failure behaviour of Al-Sc alloy under shear loading

W.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

Abstract
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 -150 ${^\circ}$ C, 25 ${^\circ}$ C and 300 ${^\circ}$ C. 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.