Investigation of the Damping Behavior and Tensile Properties of Bilayer Ni‐Ti Particle‐Reinforced 1060 Aluminum–Matrix Composites

The single Ni‐Ti particle‐reinforced aluminum–matrix composites have a narrow damping temperature range and few damping peaks, which limit their practical applications. To address this issue, this study utilizes rolling composite technology to incorporate layers of Ni‐Ti particles in various aging states into 1060 aluminum. This method yields bilayer Ni‐Ti particle‐reinforced 1060 aluminum–matrix composites with multiple internal friction peaks from phase transformations and a broader damping temperature range. The research indicates strong bonding between alloy particles and the 1060 aluminum matrix, without obvious elemental diffusion at the NiTi/Al interface. Compared to the single‐aged Ni‐Ti particle reinforcement method, the bilayer approach increases the number of phase‐transformation peaks and expands the phase‐transformation temperature range. Although the composite material exhibits greater strength than 1060 aluminum, its elongation was lower. Internal friction peaks of the bilayer composite at –48, –31, 6, 38, and 66 °C surpass those of 1060 aluminum by 245%, 223%, 153%, 151%, and 120%, respectively. This enhancement in damping capacity is attributed to synergistic effects from interfacial damping, dislocation damping, and phase‐transformation damping within the composites.