Modeling solid solution strengthening in nickel alloys

Abstract

The yield stress of multicomponent nickel solid solution alloys has not been modeled in the past with respect to the effects of composition and temperature. There have been investigations of the effect on the yield stress of solutes in binary systems at a fixed temperature, but the effects on the yield stress of multiple solute elements and temperature changes have not been investigated. In this article, two different forms of the trough model are considered for nickel-base alloys to determine the most applicable model for solid solution strengthening in the system. The yield stresses of three binary nickel-chromium and three ternary nickel alloys were determined at a range of temperatures. The yield stress of the alloys was then modeled using the Feltham equation. The constants determined in fitting the Feltham equation to the experimental data were then applied to other experimental solid solution alloys and also to published information on commercial solid solution nickel alloys. It was found that the yield stress of the nickel solid solution alloys could be modeled successfully using the Feltham equation.

Evaluation of Solid-Solution Hardening in Several Binary Alloy Systems Using Diffusion Couples Combined with Nanoindentation

“…These are in qualitative agreement with the experimental results. The observed SSH is also in good agreement with the literature [9,[31][32][33] on macroscopic mechanical testing. The k values of 411 and 11 MPa/at.…”

“…1/2 obtained by fitting the Fleischer model to compressive flow stress data. [32,33] In addition, an excellent agreement is found between k for Ni-Pt (222 MPa/at. pct 2/3 ) obtained in this study and that (190 MPa/at.…”

Coherent Interfaces Increase Strain-Hardening Behavior in Tri-Component Nano-Scale Metallic Multilayer Thin Films

“…This was also seen by Abdolrahim et al [24] The alloy films also have additional solid solution strengthening component, which is on the order of 60 MPa for the CuNi alloy. [25,26] This is on the order of the increase observed in the hardness and yield strength for the alloy system in Table 1. Differences in layer thickness in the FCC layers between the alloy (60 nm) and the tri-layer (30 + 30 nm) make an exact comparison difficult, but it appears that there is a measurable impact from solid solution strengthening in the alloy systems.…”

Microstrucure and strengthening of Al–Li–Cu–Mg alloys and MMCs: II. Modelling of yield strength

“…[14]). However, solution hardening in our alloys is limited as compared to other contributions to the CRSS, and for the superposition of solid solution strengthening a linear superposition, i.e.…”

“…Refs. [7,8,9,10,11,12,13,14] and references therein). Hence, a considerable body of work on modelling of strength in alloys and composites exists and one of the main challenges for materials scientists today is the merging of the models for the different strengthening contributions to arrive at a detailed description of the strengthening in complex alloys and composites on the basis of microstructural observations.…”