Effects of milling time on the tensile properties of nickel-based oxide dispersion strengthened alloy

The effect of milling time on the mechanical alloying (MA) and tensile properties of the nickel-based oxide dispersion strengthened (ODS) alloy ws studied, strengthened by oxide dispersions (yttria particles) was studied. The nickel-based ODS alloys were prepared by MA process and subsequent hot pressing. The nickel-based ODS alloy powders were milled in a planetary mill. The effect of milling time on the morphology and phase of the mixed nickel-based ODS alloy powders was investigated by using scanning electronic microscope (SEM) and X-Ray diffraction (XRD). The results indicated that the size of the mixed particles, resulting from mixing nickel-based ODS alloy powders, increased with the increasing milling time. However, the size of the mixed particles reached the maximum after milling for 8 h, then the size of the mixed particles decreased with the increasing milling time. The granularity of the nickel-based ODS alloy powders became stable and homogeneous when the milling time reached 28 h. The tensile results indicated that the nickel-based ODS alloy, fabricated with the mixed particles milled for 28 h, exhibited a highest ultimate tensile strength of 1300 MPa.