Abstract: Designing tungsten heavy alloys (WHAs) with high strength-ductility and dynamic toughness remains a critical challenge, especially under cryogenic conditions. Here, we report a W-NiFeCoMn alloy with a multiple-principal-element binder and atailored processing route that overcomes these limitations, delivering exceptional cryogenic and dynamic properties.The swaged alloy achieves 1603 MPa tensile strength and 12.6% elongation at -43 °C, along with 2443 MPa dynamic compressive strength and 708 J/cm³ impact energy absorption at 4000 s^-1, significantly outperforming conventional WHAs. This outstanding mechanical property arises from a hierarchical microstructure enabled by coupled strengthening mechanisms. Theγ phase,designed as a multi-principal element alloy (MPEA),facilitates solid solution strengthening and promotes a stress-induced face-centered cubicto body-centered cubictransformation at cryogenic temperatures, which increases dislocation density and narrows interphase hardness mismatch. Rotary swaging induces specific interfacial structures and short-rangegrain orientation ordering in the γ phase, improving dislocation slip and transfer at the W-γ interface. Subsequent annealing promotes the formation ofcoherent L1₂ nanoprecipitates, which act as dislocation sources without disrupting lattice continuity and stimulate twinformation. The synergistic effect of TRIP and TWIP mechanisms can effectively relieve W-γ interfacial stress and enhance plasticity.Under high-strain-rate loading, the swaged alloy forms adiabatic shear bands, deformation twins, and interfacial compositional gradients in W and γ phases, which jointly suppress stress localization and enhance energy absorption. These hierarchical structural features—lattice distortion, phase transformation, interfacial plasticity, and precipitation strengthening—synergistically improve strength, ductility, and dynamic toughness, offering a promising pathway for next-generation high-performance WHAsunder extreme environments.

Key words: WHAs, Strengthen-ductility, MPEAs, L1₂ nanoprecipitates, Dynamic properties