An Q1, Goddard WA 3rd1, Xie KY2, Sim GD2, Hemker KJ2, Munhollon T3, Toksoy MF3, Haber RA3.
Nano Lett. 2016 Dec 14;16(12):7573-7579. Epub 2016 Nov 14.The theoretical strength of a material is the minimum stress to deform or fracture the perfect single crystal material that has no defects. This theoretical strength is considered as an upper bound on the attainable strength for a real crystal. In contradiction to this expectation, we use quantum mechanics (QM) simulations to show that for the boron carbide (B4C) hard ceramic, this theoretical shear strength can be exceeded by 11% by imposing nanoscale twins. Read More