TY - JOUR
T1 - Heavily twinned CoCrNi medium-entropy alloy with superior strength and crack resistance
AU - Feng, Xiaobin
AU - Yang, Haokun
AU - Fan, Rong
AU - Zhang, Wenqiang
AU - Meng, Fanling
AU - Gan, Bin
AU - Lu, Yang
PY - 2020/6/24
Y1 - 2020/6/24
N2 - The recrystallized and pre-deformed CoCrNi medium-entropy alloy (MEA), introduced with high-density deformation twins, exhibits an unprecedented high yield strength up to 2.1 GPa. We found that the highly distorted deformation twins provide strong resistance to crack propagation and the activated dislocation motion accommodates the further plastic deformation. Our in situ tensile tests of pre-notched sample reveal that crack propagation through strain localization band eventually leads to fracture. This result offers new insights on design and processing of MEA for desired mechanical performance.
AB - The recrystallized and pre-deformed CoCrNi medium-entropy alloy (MEA), introduced with high-density deformation twins, exhibits an unprecedented high yield strength up to 2.1 GPa. We found that the highly distorted deformation twins provide strong resistance to crack propagation and the activated dislocation motion accommodates the further plastic deformation. Our in situ tensile tests of pre-notched sample reveal that crack propagation through strain localization band eventually leads to fracture. This result offers new insights on design and processing of MEA for desired mechanical performance.
KW - Medium-entropy alloy
KW - In-situ tensile test
KW - Deformation twin
KW - Strength
KW - Crack resistance
UR - http://www.scopus.com/inward/record.url?scp=85085275069&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85085275069&origin=recordpage
U2 - 10.1016/j.msea.2020.139591
DO - 10.1016/j.msea.2020.139591
M3 - RGC 21 - Publication in refereed journal
SN - 0921-5093
VL - 788
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
M1 - 139591
ER -