Atomic Scale Investigation of Impurity 3D Distribution in Nanocrystalline Ni Processed by SPD
Some nanocrystaline Ni was prepared by repeated cold rolling with intermediate folding (F&R). The material was then processed by High Pressure Torsion (HPT) to study the grain evolution under additional Severe Plastic Deformation (SPD). Microstructures were characterized by Transmission Electron Microscopy (TEM) and the impurity distribution was analyzed by Atom Probe Tomography (APT). In this paper, we discuss about the influence of impurities on the grain growth during HPT and on the grain size reduction mechanism during SPD.
Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon
X. Sauvage et al., "Atomic Scale Investigation of Impurity 3D Distribution in Nanocrystalline Ni Processed by SPD", Materials Science Forum, Vols. 667-669, pp. 169-174, 2011