Microstructure and Microhardness of a Nanostructured Nickel-Iron Based Alloy
This paper presents an overview and some original results about the mechanical properties and phase analysis of a nanostructured (NS) nickel-iron based alloy INCONEL 718. This structure was obtained by severe plastic deformation (SPD) via high pressure torsion (HPT) and multiple isothermal forging (MIF) of the alloy with an initial coarse-grained (CG) structure. Materials before and after SPD were analyzed by scanning, transmission electron microscopes and atom probe tomography (APT). Experimental data indicate that after HPT at room temperature - phase was partly dissolved and that precipitation of the -phase occurs during post deformation aging. A hardness up to 8 GPa was recorded for the NS alloy after SPD and annealing at 600°C.
S. K. Mukhtarov and X. Sauvage, "Microstructure and Microhardness of a Nanostructured Nickel-Iron Based Alloy", Materials Science Forum, Vol. 683, pp. 127-135, 2011