MODELING SOLID-SOLUTION STRENGTHENING IN NICKEL-ALLOYS

The yield stress of multicomponent nickel solid solution alloys has no t been modeled in the past with respect to the effects of composition and temperature. There have been investigations of the effect on the y ield stress of solutes in binary systems at a fixed temperature, but t he effects on the yield stress of multiple solute elements and tempera ture changes have not been investigated. In this article, two differen t forms of the trough model are considered for nickel-base alloys to d etermine the most applicable model for solid solution strengthening in the system. The yield stresses of three binary nickel-chromium and th ree ternary nickel alloys were determined at a range of temperatures. The yield stress of the alloys was then modeled using the Feltham equa tion. The constants determined in fitting the Feltham equation to the experimental data were then applied to other experimental solid soluti on alloys and also to published information on commercial solid soluti on nickel alloys. It was found that the yield stress of the nickel sol id solution alloys could be modeled successfully using the Feltham equ ation.