TY - GEN
T1 - Dynamic Deformation Behaviour and Dislocation Substructure of AZ80 Magnesium Alloy over a Wide Range of Temperatures
AU - Lee, Woei Shyan
AU - Chou, Cheng Wen
PY - 2018/9/7
Y1 - 2018/9/7
N2 - The high strain rate deformation behaviour and dislocation substructure of AZ80 magnesium alloy are investigated at strain rates of 8x102 s-1, 1.5x103 s-1 and 2.2x103 s-1 and temperatures of-100 C, 25 C and 300 C using a compressive split-Hopkinson pressure bar system. The flow stress, work hardening coefficient, strain rate sensitivity and temperature sensitivity all increase with increasing strain rate or decreasing temperature. Moreover, the dynamic deformation behaviour is well described by the Zerilli-Armstrong hcp constitutive equation. Transmission electron microscopy observations show that the dislocation density increases with a higher strain rate or a lower temperature. Finally, the flow stress varies linearly with the square root of the dislocation density in accordance with the Bailey-Hirsch model.
AB - The high strain rate deformation behaviour and dislocation substructure of AZ80 magnesium alloy are investigated at strain rates of 8x102 s-1, 1.5x103 s-1 and 2.2x103 s-1 and temperatures of-100 C, 25 C and 300 C using a compressive split-Hopkinson pressure bar system. The flow stress, work hardening coefficient, strain rate sensitivity and temperature sensitivity all increase with increasing strain rate or decreasing temperature. Moreover, the dynamic deformation behaviour is well described by the Zerilli-Armstrong hcp constitutive equation. Transmission electron microscopy observations show that the dislocation density increases with a higher strain rate or a lower temperature. Finally, the flow stress varies linearly with the square root of the dislocation density in accordance with the Bailey-Hirsch model.
UR - http://www.scopus.com/inward/record.url?scp=85053711176&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85053711176&partnerID=8YFLogxK
U2 - 10.1051/epjconf/201818303010
DO - 10.1051/epjconf/201818303010
M3 - Conference contribution
AN - SCOPUS:85053711176
SN - 9782759890538
T3 - EPJ Web of Conferences
BT - DYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
A2 - Cosculluela, Antonio
A2 - Cadoni, Ezio
A2 - Buzaud, Eric
A2 - Couque, Herve
PB - EDP Sciences
T2 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading, DYMAT 2018
Y2 - 9 September 2018 through 14 September 2018
ER -