Table of Contents
Textures and Microstructures
Volume 33, Issue 1-4, Pages 207-217
http://dx.doi.org/10.1155/TSM.33.207

Determination of Residual Stresses in WCu Gradient Materials

1Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Moscow Region, Dubna 141980, Russia
2Fraunhofer Institut für zerstörungsfreie Prüfverfahren, Außenstelle Dresden, Krügerstraße 22, Dresden D-01326, Germany

Copyright © 1999 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Residual stress measurements were carried out on copper–tungsten gradient materials by means of neutron diffraction on the High Resolution Fourier Diffractometer on IBR-2, JINR, Dubna. The samples so far investigated had a concentration profile that approximates the gradient by step functions. The results show an averaged positive stress (stretch) in the copper phase and negative (compression) in the tungsten phase. A comparison to analytical linear elastic calculations shows that the measured values are nearly an order of magnitude too low, whereas however, a qualitative agreement of the stress distribution exists. That this quantitative discrepancy can be attributed to the model's simplifying assumption of pure elastic behaviour can be shown by recent calculations that also include plasticity and show a much better agreement with the experimental values. Single peak evaluation also strongly suggests that plasticity does indeed play a significant role.