Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 95, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2020.105415
Keywords
Homogeneous dislocation nucleation; Strength mechanism; FCC -> HCP phase transformation; Deformation twinning
Funding
- National Natural Sciences Foundation of China [11572191, 51701117, 51779139]
- Shanghai science and technology committee foundation [17411962200]
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Molecular dynamics simulations of a typical polycrystalline CoCrFeMnNi high-entropy alloy reveal that FCC -> HCP phase transformation is the dominant plastic deformation behavior in the early stages, while twinning induced plasticity plays a critical role at large strains.
Molecular dynamics is used to examine the evolution of dislocations and FCC -> HCP phase transformation, as well as deformation twinning for a typical polycrystalline CoCrFeMnNi high-entropy alloy. It is found the discrepancy of the stress-strain curve for tension and compression owing to the strength mechanism during deformation. The grain refinement behavior is only observed in samples of compression, which leads to the difference of flow stress compared with the tension. At the early plastic stage, FCC -> HCP phase transformation is the major deformation behavior. Three paths of FCC -> HCP phase transformation for inducing plasticity are analyzed, and the mechanism of spontaneous nucleation of stacking faults is the mainly approach to the transformation. For large strain, the pattern of twinning induced plasticity plays a critical role on the plastic deformation of the HEA. The results are qualitatively consistent with experiments and provide a fundamental understanding of plastic deformation in FCC polycrystalline CoCrFeMnNi HEA.
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