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- W2925653015 abstract "Materials either have a high hardness or excellent ductility, but rarely both at the same time. ${mathrm{Mo}}_{2}mathrm{BC}$ is one of the only crystalline materials that simultaneously has a high Vickers hardness and is also moderately ductile. The origin of this unique balance is revealed here using stress-strain calculations. The results show an anisotropic nonlinear elastic response including an intermediate tensile strain-stiffening behavior and a two-step sequential failure under shear strain that resembles the behavior of soft materials such as biological systems or polymer networks rather than hard, refractory metals. The mechanism of the unusual nonlinear elasticity is established by analyzing changes in the electronic structure and the chemical bonding environments under mechanical perturbation. The optimized structure under extreme strain shows the formation of a pseudogap in DOS and dimerization of the structure's boron-boron zigzag chain. These mechanisms delay the ultimate failure, establishing a pathway for developing the next generation of structural materials with high hardness and ductility." @default.
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- W2925653015 date "2019-08-09" @default.
- W2925653015 modified "2023-10-17" @default.
- W2925653015 title "Mechanism for unconventional nonlinear elasticity" @default.
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- W2925653015 doi "https://doi.org/10.1103/physrevb.100.060102" @default.
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