7 research outputs found
Lead Zirconate Titanate/Modified Nickel Ferrite Magnetoelectric Composites Prepared from Submicron Precursors
On Two Little Known Species of Leaf Beetles (Coleoptera, Chrysomelidae) from the South Urals
Suspended sediment yield transportation by rivers of the Kamchatsky Krai into the Pacific Ocean, the sea of Okhotsk and the Bering Sea
Measurement of the polarization parameterP in? + p elastic scattering in the region of low-lying pion-nucleon resonances
Theoretical shear strength and the onset of plasticity in nanodeformation of cubic boron nitride
The nanoindentation in the continuous stiffness measurement mode was used to investigate the onset of plasticity at the nanodeformation of cubic boron nitride (cBN). This technique allows us to reveal an elastic-plastic transition in the contact and to measure the yield strength of cBN at the nanoscale. An abrupt elastoplastic transition (a pop-in) was observed in the (111) cBN single crystal as a result of a homogeneous or heterogeneous nucleation of dislocations in the previously dislocations-free region under the contact. The analysis of the data obtained at the homogeneous nucleation of dislocations in the contact region made it possible to experimentally estimate the theoretical shear strength of cBN and its ideal (elastic) hardness. In a sample of the fine-grained cBN with a nanotwinned substructure a smooth elastoplastic transition was observed in consequence of the propagation and multiplication of already existing dislocations in the contact region