• • The alloy Fe54Ni34Co6Ti3Al3 achieves a tensile yield strength of 1036±21 MPa, a 3-4x improvement over conventional Invar alloys, enabling load-bearing applications in precision components.
• • Uniform elongation of 18.4%±1.1% is retained, providing formability and damage tolerance critical for complex aerospace and cryogenic parts.
• • Coefficient of thermal expansion is 5.8×10−6 °C−1, approaching Invar-class values while maintaining mechanical robustness, addressing the historical strength-thermal expansion trade-off.
• • The design leverages coherent L12 nanoprecipitates to modulate matrix composition, inducing transformation-induced plasticity (TRIP) for enhanced strain hardening, a novel mechanism for simultaneous property optimization.