Experimental and theoretical studies of the superposition of intergranularand macroscopic strains in Ni-based industrial alloys

Measurements of the strain response to applied stress in polycrystalline MO NEL-400 by neutron diffraction are modeled with the elastoplastic self-cons istent (EPSC) theory. The strains in the different crystallographic orienta tions of grains, which are generated in the tensile test experiments, are s hown to be caused by the anisotropy of elastic and plastic deformation with respect to crystallographic orientation. On the basis of the description o f the results in the theory, the origin of a number of anomalies of a gener al nature in measurements by both neutron and X-ray diffraction can be unde rstood. The theory is used to calculate which crystallographic reflections are least sensitive to intergranular effects under uniaxial tension.