LAUSR

Particle‐reinforced Al metal matrix composites attract more attention due to their excellent properties. The size of the reinforcing particles and their distribution in the matrix are the key factors determining their properties. In situ NbB2 and NbC nanoparticles are prepared using Al–Nb and B4C powders as raw materials by melt spinning and used to reinforce 2219Al. To improve the distribution of nanoparticles in the matrix, the melt is subjected to ultrasonic vibration during the preparation of NbB2–NbC/2219Al composites. After adding the reinforcement nanoparticles and ultrasonic vibration treatment, the grain sizes of 2219Al are decreased. Scanning electron microscope (SEM) test results showed that most of the reinforcing particles are uniformly distributed in the matrix. The high‐resolution transmission electron microscope (HRTEM) image and selected‐area electron diffraction (SAED) pattern show that the reinforcing particles and α‐Al form coherent and semicoherent interfaces with direct atom bonding. The results of mechanical properties’ research show that the addition of NbB2 and NbC nanoparticles is beneficial to the room‐ and high‐temperature properties of the alloy.