Features of the processes of elastic deformation in cubic crystals

Abstract

The processes of elastoplastic deformation in single-crystal alloys characterized by cubic symmetry of properties are investigated. Using the heat-resistant single-crystal alloy VZhM8 used to create gas turbine engine blades by directional crystallization as an example, the dependences of deformation processes on the orientation of loading directions with respect to crystallographic axes are shown. Significant anisotropy of mechanical properties, including the presence of negative Poisson’s ratios, in heat-resistant nickel alloys is maintained up to a temperature of 1150 C. Therefore, over the entire range of operating temperatures, the propagation velocities of elastic and plastic waves in single-crystal heat-resistant nickel alloys depend on the propagation direction. On the example of a VZhM8 single-crystal alloy under dynamic loading in a three-dimensional formulation, the differences in the processes of deformation realized in a single crystal under loading along the [011], [111] and [001] axes are investigated.