A combined experimental/computational approach was employed to study slip-system-related dislocation-substructure formation during uniaxial tension of a single-phase, face-centered cubic, Ni-based alloy. In situ neutron-diffraction measurements were conducted to monitor the peak-intensity, peak-position, and peak-broadening evolution during a displacement-controlled, monotonic-tension experiment at room temperature. The measured lattice-strain evolution and the macrostress/macrostrain curves were used to obtain the material parameters required for simulating the texture development by a visco-plastic self-consistent model. The simulated texture compared favorably with experimentally-determined texture results over a range of 0 to 30% engineering strain. The grain-orientation-dependent input into the Debye-intensity ring was considered. Grains favorably oriented relative to the two detector banks in the geometry of the neutron experiment were indicated. For the favorably oriented grains, the simulated slip-system activity was used to calculate the slip-system-dependent, dislocation-contrast factor. The combination of the calculated contrast factor with the experimentally-measured peak broadening allowed the assessment of the parameters of the dislocation arrangement within the specifically oriented grains, which has a quantitative agreement with the transmission-electron-microscopy results.

Slip-System-Related Dislocation Study from in situ Neutron Measurements. E.W.Huang, R.Barabash, N.Jia, Y.D.Wang, G.E.Ice, B.Clausen, J.Horton, P.K.Liaw: Metallurgical and Materials Transactions A, 2008, 39[13], 3079-88