1 results listed
Tensile deformation response of Fe40Mn40Co10Cr10 high entropy alloy (HEA) and equiatomic NiCoCr medium
entropy alloy (MEA) single crystals oriented along the [111] crystallographic orientation was investigated at room
temperature. In-situ digital image correlation and transmission electron microscopy observations revealed that two micro-
deformation mechanisms govern the strain hardening in the Fe40Mn40Co10Cr10 HEA, namely planar slip and twinning,
while twinning dominates in the NiCoCr MEA. Consequently, the twin-slip interaction in the Fe40Mn40Co10Cr10 HEA
leads to a higher rate of work hardening as compared to the NiCoCr MEA. However, NiCoCr MEA single crystals attain
higher fracture strains and exhibit higher ultimate strength as compared to the Fe40Mn40Co10Cr10. HEA. The micro-
deformation mechanisms responsible for these observations were investigated with detailed transmission electron
microscopy analysis, which revealed that nanotwin formation within primary twins was prevalent at the early stages of
deformation in NiCoCr MEA, significantly enhancing the ductility, while the higher strength levels are associated with
the high volume fraction of twins with relatively small thickness.
International Symposium on Light Alloys and Composite Materials
UHAKS
Sezer Picak
B.Uzer
J. Liu
D. Canadinc
Y.I. Chumlyakov
I. Karaman