Determination of elastoplastic properties and porosity of composite nickel-iron roofs

Abstract

This paper presents the elastic-plastic properties (he, hp; h; Ae; Ap; A; H; Hh; Hd, P) and define the parameters (Pcr; Hhcr; Hdcr) beginning of brittle fracture of iron-nickel composite coatings. First established experimentally that with the beginning of brittle fracture (Pcr = P), the work expended in elastic (Ae), plastic (Ap) and elastic-plastic (A) deformation significantly increases the load on the diamond spherical indenter (Pcr = P) and indentation depth (hp; h) decreases with increasing current density (DК) and a decrease in the electrolysis temperature (T). Critical load indentation (Pcr), not restored critical hardness (Hhcr) or the critical stress can be taken as a criterion for assessing the propensity of iron-nickel composite coatings to brittle fracture.