Using the elastic modulus defect for diagnostics of plastic deformation of metal

A non-destructive method for assessing the plastic deformation of a metal after processing a product is proposed, based on a change in the elastic properties of the material. Keywords metal, elastic properties, modulus of elasticity, Poisson's ratio, plastic deformation, non-destructive method, tension. [email protected]

Влияние термической обработки на упругие и неупругие свойства монокристаллов сплава Ni-=SUB=-55-=/SUB=-Fe-=SUB=-18-=/SUB=-Ga-=SUB=-27-=/SUB=-

We have studied the influence of thermal treatment on the dynamic Young’s modulus, linear and nonlinear internal friction, and Young’s modulus defect of Ni_55Fe_18Ga_27 alloy single crystals. Strong variations of all these parameters were observed and explained by changes in the concentration of vacancies in the crystal lattice. It is concluded that vacancies form atmospheres near twin boundaries, the density of which (but not their extension) strongly depend on the concentration of vacancies.