Creating tailored interfaces between soft and hard materials is a promising route to simultaneously enhance ductility and strength of multicomponent materials. Here, we study deformation mechanisms in a model bicrystal, with a Kurdjumov–Sachs (KS) interface, between face-centered-cubic Ni and ordered-B2 NiAl slabs using molecular dynamics simulations.
The bicrystals were uniaxially deformed by strain rates of 107\documentclass[12pt]{minimal}
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\begin{document}$$10^9\,\hbox {s}^{-1}$$\end{document} by holding temperatures constant at 300, 500, 700, and 900 K for each strain rate.
Our simulations reveal atomistic processes that create sessile and glissile dislocations, and their reactions during high-strain rate deformation. At 109s-1\documentclass[12pt]{minimal}
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\begin{document}$$10^9\,\hbox {s}^{-1}$$\end{document} strain rates, dislocation processes enhance ductility and cause large-scale atomic rearrangements in the KS interfacial region. This subsequently causes nucleation, growth, and coalescence of nano-voids into cracks inside the harder B2-ordered phase bordering the interface. Our results suggest that interfaces between “soft”–“hard” materials likely withstand high-strain rates better.
