Lattice strain evolution in a high volume fraction polycrystal nickel superalloy

Lattice strain evolution is measured by neutron diffractrometry during tensile testing of a high volume fraction polycrystal nickel superalloy. The intergranular strains reveal anisotropic deformation, with the {2 0 0} plane being least stiff and the {1 1 1} being the stiffest. Initial plasticity is due to yielding of the {2 2 0}. Deconvolution of the {2 0 0} and {2 2 0} doublets reveals co-deformation of γ and γ′ phases during plasticity. Comparisons are drawn with low and medium volume fraction superalloys.