Fracture mechanisms of Ni-Al interfaces-A nanoscale view

S Kolli and E Yousefi and YQ Sun and A Kunwar and MX Guo and N Moelans and M Seefeldt and D Seveno, MATERIALS TODAY COMMUNICATIONS, 32, 103967 (2022).

DOI: 10.1016/j.mtcomm.2022.103967

Unraveling the roles of inter-diffusion, intermetallic formation and interfacial behavior in Ni-Al bimetallic nanostructures through molecular dynamics simulations are highly useful in quantifying the structure-property relationship at nanoscale. This study presents insights into deformation mechanisms during the tensile and shear tests of pure Al, Ni and Ni-Al interfacial systems. The major deformation mechanisms in pure Al and Ni are slip by Shockley partials with possible twinning in both tensile and shear loading conditions. On deformation of the Ni-Al systems, the fracture is observed in pure Al and Al-rich regions indicating higher strength and load -transferability of the interface. The dominant dislocations are Shockley partials and stair-rod in both the loading conditions. Ni-Al interfacial systems exhibit yield point phenomenon under tensile deformation. The tensile and shear strengths are observed to be improved with increasing diffusion of Ni into Al.

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