An X-ray method for the determination of stored energies in texture components of deformed metals; Application to cold worked ultra high purity iron

An X-ray method has been developed to evaluate the stored energy of cold wo rk in different texture components of plastically deformed metals. The disl ocation density and the outer cut-off radius of dislocations are obtained f rom Bragg peaks recorded from single texture components. The stored energy is approximated by the energy of dislocations, which is calculated accordin g to the anisotropic theory of elasticity. As an example the method is appl ied to the case of two major texture components developed in cold rolled ul tra high purity (UHP) iron. The stored energy of the {111}[112]-gamma fibre component of the 88% cold rolled UHP iron is about 3.6 times larger than t hat of the {001}[110]-alpha fibre component. The present results, of signif icantly higher accuracy than those of previous methods, are in good agreeme nt with data obtained from microhardness and recent calorimetric measuremen ts. (C) 2000 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.