Short-term tensile creep behavior of CoCrNi-based multi-principal element alloys

We report the short-term tensile creep behavior of CoCrFeMnNi and CoCrNi model MPEAs at 550 °C. Dislocation glide and dislocation-dislocation/lattice interactions are proposed to be dominated deformation mechanisms for CoCrFeMnNi and CoCrNi, respectively. Besides, compared to CoCrFeMnNi, CoCrNi exhibits lower creep rate and longer rupture time at same testing conditions. This is attributed to CoCrNi's lower stacking fault energy and higher lattice friction. Additionally, the effect of grain size on the short-term creep behavior of CoCrFeMnNi was revealed. • Short-term deformation behavior of CoCrNi-based model MPEAs at 550 °C is reported. • Dislocation glide and dislocation-dislocation/lattice interactions are dominated deformation mechanisms for CoCrFeMnNi and CoCrNi, respectively. • Compared to CoCrFeMnNi, CoCrNi exhibits lower creep rate and longer rupture time at the same testing conditions. • Effect of grain size on short-term creep behavior of CoCrFeMnNi was investigated.