TY - GEN
T1 - Shear localization of fcc high-entropy alloys
AU - Meyers, Marc A.
AU - Li, Zezhou
AU - Zhao, Shiteng
AU - Wang, Bingfeng
AU - Liu, Yong
AU - Liaw, Peter K.
N1 - Publisher Copyright:
© 2018 The Authors, published by EDP Sciences.
PY - 2018/9/7
Y1 - 2018/9/7
N2 - Dynamic behavior of the single phase (fcc) Al0.3CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs) was examined. The combination of multiple strengthening mechanisms such as solid solution hardening, cutting forest dislocation, as well as mechanical nano-twinning leads to a high work-hardening rate, compared with conventional alloys. The resistance to shear localization was studied by dynamicallyloading hat-shaped specimens to induce forced shear localization. However, no adiabatic shear band could be observed for Al0.3CoCrFeNi HEA at a large shear strain ~1.1. Additionally, shear localization of the CoCrFeMnNi HEA was only found at an even larger shear strain ~7 under dynamic compression. It is therefore proposed that the combination of the excellent strain-hardening ability and modest thermal softening of these two kinds of high-entropy alloys gives rise to remarkable resistance to shear localization, which makes HEAs excellent candidates for impact resistance applications.
AB - Dynamic behavior of the single phase (fcc) Al0.3CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs) was examined. The combination of multiple strengthening mechanisms such as solid solution hardening, cutting forest dislocation, as well as mechanical nano-twinning leads to a high work-hardening rate, compared with conventional alloys. The resistance to shear localization was studied by dynamicallyloading hat-shaped specimens to induce forced shear localization. However, no adiabatic shear band could be observed for Al0.3CoCrFeNi HEA at a large shear strain ~1.1. Additionally, shear localization of the CoCrFeMnNi HEA was only found at an even larger shear strain ~7 under dynamic compression. It is therefore proposed that the combination of the excellent strain-hardening ability and modest thermal softening of these two kinds of high-entropy alloys gives rise to remarkable resistance to shear localization, which makes HEAs excellent candidates for impact resistance applications.
UR - http://www.scopus.com/inward/record.url?scp=85053697120&partnerID=8YFLogxK
U2 - 10.1051/epjconf/201818303028
DO - 10.1051/epjconf/201818303028
M3 - Conference contribution
AN - SCOPUS:85053697120
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 -