Exploring mechanical properties and diffusion paths in Al–Co–Ni diffusion multiples fabricated through spark plasma sintering

The diffusion multiple containing Ni–NiAl–Co alloys was fabricated using spark plasma sintering technique. The microstructure, mechanical properties and diffusion behavior were evaluated under annealing conditions of 1100 °C and 800 °C. The results suggest that spark plasma sintering proves to be an efficient processing approach in producing well-welded diffusion multiples in Al–Co–Ni based alloys. Nano-indentation tests were employed to quantify specific hardness and modulus values of the γ′, β and γ phases on a micro-scale level. Additionally, the diffusion path was determined through correlated compositional analysis, aligning well with existing phase equilibria data.