Void growth and coalescence in model materials investigated by high-resolution X-ray microtomography Influence of work hardening behavior on ductility

摘要

The influences of work hardening behavior of materials on ductile fracture, and especially on void growth and coalescence, have been investigated in model materials by in-situ X-ray computed tomography (XCT) coupled with tensile deformation. The model materials contain an artificial void array embedded in a metal matrix. By producing such materials with different metal matrices (pure copper, brass, Glidcop = copper strengthened by Al_2O_3 nanoparti-cles), the influences of the work hardening behaviors on void growth and coalescence/linkage process are analyzed. This set of experiments were performed at Japanese synchrotron radiation facility SPring-8 BL20XU beamline, whereby the X-ray tomography setup with one of the highest spatial resolution in the world is available. This beamline however provides less brilliant X-rays compared to the ESRF ID15 beam-line where the our previous experiments were performed Hosokava et al. (Acta Mater, 60:2829-2839, 2012), (Acta Mater, 61:1021-1036, 2013).