Tension-compression asymmetry in Ni/Ni3Al interfaces: An atomistic investigation

S Chandra and A Alankar and MK Samal and VM Chavan, MATERIALS LETTERS, 362, 136172 (2024).

DOI: 10.1016/j.matlet.2024.136172

Nickel-based superalloys are well known for their excellent mechanical properties under high thermal or mechanical extremes. Reliable predictions of deformation behavior becomes paramount in such cases. Since Ni/ Ni3Al interface is the prime defect in Ni-based superalloy single crystals, this letter investigates the underlying deformation mechanisms in differently oriented Ni-Ni3Al interfaces using atomistic simulations. For in-plane loading along the interface, significant tension-compression asymmetry (TCA) is observed in yielding and the responsible deformation mechanisms at the inception of plasticity are illustrated. Additionally, in-plane yield surface is constructed through biaxial loadings of the material. Finally, a generalized flow equation is proposed to capture the observed asymmetric behavior for its potential use in the realm of higher length scales.

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