TY - JOUR
T1 - Achieving superior combined cryogenic strength and ductility in a high-entropy alloy via the synergy of low stacking fault energy and multiscale heterostructure
AU - An, Zibing
AU - Mao, Shengcheng
AU - Jiang, Cheng
AU - Li, Ziyao
AU - Wu, Shichang
AU - Zhai, Yadi
AU - Wang, Li
AU - Liu, Yinong
AU - Zhang, Ze
AU - Han, Xiaodong
PY - 2024/1/15
Y1 - 2024/1/15
N2 - A Co30Cr20Fe18Mn18Ni11Si3 high-entropy alloy (HEA) with low stacking fault energy and high strengthen was designed based on the principle of heterostructure strengthening. The alloy was processed into a multiscale heterogeneous microstructure containing hierarchical twins. The alloy achieved an ultrahigh yield strength of 1500 MPa, ultimate tensile strength of 1750 MPa and a large ductility of 20 % at 77 K. These mechanical properties were superior to those of most FCC HEAs reported in the literature, breaking the strength-ductility trade-off of conventional metal alloys. Such extraordinary mechanical properties were attributed to a suitable strain hardening capability, stemming from the synergistic effect of hetero-deformation-induced hardening, twinning-induced plasticity, and deformation-induced phase transformation during tensile deformation.
AB - A Co30Cr20Fe18Mn18Ni11Si3 high-entropy alloy (HEA) with low stacking fault energy and high strengthen was designed based on the principle of heterostructure strengthening. The alloy was processed into a multiscale heterogeneous microstructure containing hierarchical twins. The alloy achieved an ultrahigh yield strength of 1500 MPa, ultimate tensile strength of 1750 MPa and a large ductility of 20 % at 77 K. These mechanical properties were superior to those of most FCC HEAs reported in the literature, breaking the strength-ductility trade-off of conventional metal alloys. Such extraordinary mechanical properties were attributed to a suitable strain hardening capability, stemming from the synergistic effect of hetero-deformation-induced hardening, twinning-induced plasticity, and deformation-induced phase transformation during tensile deformation.
KW - Hetero-deformation induced hardening
KW - Heterogeneous structure
KW - High -entropy alloy
KW - Mechanical properties
UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=uwapure5-25&SrcAuth=WosAPI&KeyUT=WOS:001093321600001&DestLinkType=FullRecord&DestApp=WOS
U2 - 10.1016/j.scriptamat.2023.115809
DO - 10.1016/j.scriptamat.2023.115809
M3 - Article
SN - 1359-6462
VL - 239
JO - Scripta Materialia
JF - Scripta Materialia
M1 - 115809
ER -