Abstract In order to study the effects of coarse grain size and Ni content on mechanical properties, molecular dynamics (MD) simulation nanocrystalline (NC) Ni-W alloys with bimodal structure is carried out. The NC samples are established by embedding into fine matrix. solute atoms in segregated boundary affected zone (GBAZ) through severe plastic deformation (SPD). uniaxial tensile shows that ...

This research work studies the structural phase parameters and physicomechanical properties of metal-matrix composite materials based on a Ni–TiB2 system obtained by additive manufacturing (specifically, direct laser deposition). The composites were investigated at high temperatures (up to 1000 °C). feasibility fabrication nanostructure alloy with advanced was shown. introduction reinforcing Ti...

The mechanical strengths of nano-scale individual crystal or nanopolycrystalline metals, and other dimensionally-related materials are increased by an order of magnitude or more as compared to those values measured at conventional crystal or polycrystal grain dimensions. An explanation for the result is attributed to the constraint provided at the surface of the crystals or, more importantly, a...

This paper reports a dramatic increase in the grain boundary strengthening or Hall-Petch coefficient, K, by systematically investigating effect of Al addition on tensile yield strength CoFeN...

In recent years it has become possible to study the properties of nanocrystalline metals through atomic-scale simulations of systems with realistic grain sizes. A brief overview of the main results is given, such as the observation of a reverse Hall-Petch effect — a softening of the metal when the grain size is reduced. The limitations of computer simulations are discussed, with a particular fo...