Enhanced strength and damping in NiTiV alloy through nanoengineered R-phase confinement

In vibration damping and noise reduction applications, high-damping alloys face a persistent challenge: an inverse correlation between strength and damping properties. In this study, a novel Ni 51 Ti 48 V 1 alloy was developed through the combined modulation of nanoscale coherent precipitates and solute atoms, enabling the R-phase-containing NiTi alloy to have a high apparent yield strength. Experimental results indicate that the apparent yield strength of this alloy ranges from 245 MPa to 376 MPa, representing 5 to 7 times higher values than traditional R-phase-containing NiTi alloys. Simultaneously, the alloy maintains excellent damping performance with a loss factor (tan δ) of 0.164. Additionally, the formation of twin-free single-variant R-phase structures (5 nm∼10 nm diameter) may be attributed to the combined restriction of R-phase growth by 2 nm to 5 nm Ni 4 Ti 3 precipitates and V atomic solid solution. This microstructure effectively suppresses stress-induced preferential orientation deformation, enabling 94% retention of initial damping capacity after 5% tensile overload and superior superelastic cyclic stability. The work presents a novel strategy for developing high-load-bearing metallic materials with exceptional energy dissipation characteristics, demonstrating significant potential for aerospace vibration reduction systems.