Incipient plasticity and dislocation nucleation of FeCoCrNiMn high-entropy alloy

摘要: Abstract Instrumented nanoindentation was conducted on a FeCoCrMnNi high-entropy alloy with single face-centered cubic structure to characterize the nature of incipient plasticity. Experiments were carried out over loading rates 25–2500 μN s −1 and at temperatures ranging from 22 150 °C. The maximum shear stress required initiate plasticity found be within 1/15 1/10 modulus relatively insensitive grain orientation. However, it strongly dependent upon temperature, indicating thermally activated process. Using statistical model developed previously, both activation volume energy evaluated further compared existing dislocation nucleation models. A mechanism consisting heterogeneous process vacancy-like defects (∼3 atoms) as rate-limiting nuclei appeared dominant.