A Novel Al-Cu Composite with Ultra-High Strength at 350 °C via Dual-Phase Particle Reinforced Submicron-Structure.

ABSTRACT: Thermal stability determines a material's ability to maintain its performance at desired service temperatures. This is especially important for aluminum (Al) alloys, which are widely used in the commercial sector. Herein, an ultra-strong and heat-resistant Al-Cu composite is fabricated with a structure of nano-AlN and submicron-Al₂ O₃ particles uniformly distributed in the matrix. At 350 °C, the (8.2AlN+1Al₂ O₃ )_p /Al-0.9Cu composite achieves a high strength of 187 MPa along with a 4.6% ductility under tension. The high strength and good ductility benefit from strong pinning effect on dislocation motion and grain boundary sliding by uniform dispersion of nano-AlN particles, in conjunction with the precipitation of Guinier-Preston (GP)

SUBMITTER: Xie K 

PROVIDER: S-EPMC10477875 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature