High strain rate compression experiments performed on a non-equiatomic metastable fcc + hcp Fe₅₀Mn₃₀Co₁₀Cr₁₀ high entropy alloy using split Hopkinson pressure bar setup shows improved flow stress and compression ductility compared to quasistatic deformed samples. The deformation response was characterised by the occurrence of hardening and softening stages compared to sustained strain hardening for quasistatic deformation. Detailed EBSD, BSE imaging analysis coupled with TEM shows significant bi-directional transformation (B-TRIP) and increased fcc γ phase stability in high strain rate regime while only forward (fcc to hcp) transformation dominates with increasing fraction of hcp ε phase in the quasistatic regime of deformation. Bidirectional transformation aided by adiabatic heating and heterogeneous deformation in the high strain rate regime leads to optimal stress and strain partitioning between the two phases and delays the initiation of damage at the interface. The presence of concomitant strain rate hardening and improvement in ductility in the dynamic deformation regime opens up avenues for microstructural tunability to achieve simultaneous improvement in strength and ductility using the metastability paradigm in complex concentrated alloys.

在非等原子亚稳 fcc + hcp Fe ₅₀ Mn ₃₀ Co ₁₀ Cr _{10上进行的高应变率压缩实验}与准静态变形样品相比，使用分离式霍普金森压力杆装置的高熵合金显示出改善的流动应力和压缩延展性。与准静态变形的持续应变硬化相比，变形响应的特点是出现硬化和软化阶段。详细的 EBSD、BSE 成像分析与 TEM 相结合，显示出显着的双向转变 (B-TRIP) 和高应变率状态下增加的 fcc γ 相稳定性，而只有正向（fcc 到 hcp）转变占主导地位，随着 hcp ε 相比例的增加变形的准静态状态。在高应变率状态下，由绝热加热和异质变形辅助的双向转变导致两相之间的最佳应力和应变分配，并延迟了界面处损伤的发生。在动态变形状态下伴随应变率硬化和延展性改善的存在为微观结构可调性开辟了途径，以在复杂浓缩合金中使用亚稳态范例实现强度和延展性的同时改善。