Structure and mechanical properties of Fe-Ni-Zr oxide-dispersion-strengthened (ODS) alloys

A series of bulk nanostructured Fe-Ni-Zr oxide-dispersion-strengthened (ODS) alloys were synthesized using high energy mechanical alloying and consolidated using high temperature equal channel angular extrusion. The resultant microstructures are composed of nano/ultrafine or micrometer-sized grains with larger intermetallic precipitates and small Zr oxide clusters (<10 nm diameter, measured and confirmed by atom probe tomography). The ODS alloys possess elevated compression properties, e.g., 1.2 and 2.4 GPa compressive yield stress at room temperature for samples consolidated at 700 degrees C and 1000 degrees C, respectively. This work highlights the relationship between processing, microstructure, and properties for this class of ferritic ODS alloys. Published by Elsevier B.V.