Study on the relationship of longitudinal wave velocity and point defects induced by cross slip

摘要

As one in a series of the authors' study on ultrasonic nondestructive material evaluation method, the FEPM (Finite Element Polycrystal Model) analysis suggested that the longitudinal wave velocity changes depended heavily upon point defects induced by cross slip and the point defects were dominated by crystallographic orientations. In order to examine the analyzed results, in this study we first study single crystal orientation effect on the total amount of cross slip via FEPM analysis, and then based upon the analyzed result, the theoretical conclusion of longitudinal wave velocity changes showing a sensitive response to the point defects is examined by measuring wave velocity changes propagating in specified oriented single crystal aluminium under pure shear state.