Experimental Investigations of Anomalous Energy Absorption in Nanocrystalline Titanium under Cyclic Loading Conditions

Abstract

An infrared thermographic scanning technique has been used to study the energy absorption and dissipation under cyclic loading conditions in the nanostructural bulk titanium obtained by severe plastic deformation of an initial coarse-grained material. It is established that the character of energy absorption in the nanocrystalline material exhibits qualitative changes, which are related to specific features of interactions in the ensemble of grain-boundary defects. The mechanisms of energy absorption are explained within the framework of notions of a new class of critical phenomena in mesoscopic systems with defects featuring structure-scaling transitions.