The Effect of Solute Elements on Hardness and Grain Size in Platinum Based Binary Alloys

Abstract

The effects of 25 kinds of solute elements on hardness and grain size in annealed Pt-based binary alloys were investigated together with cold workability and a hardness variation with a cold rolling reduction. Gain size largely varied depending on solute elements and their concentrations, and so the decrement in grain size per 1 at% solute addition was evaluated based on grain size difference between pure platinum and a respective alloy. This value markedly reduced in the low solute concentration range below 5 at%, followed by a sluggish reduction in the higher solute concentration range. Hardness values obtained in all alloys were corrected considering contribution of hardening due to grain refinement, and solid solution hardening was evaluated by the increment in hardness per 1 at% solute addition. The lattice constants of pure platinum and alloys were measured to calculate the size misfits. The increment in hardness increased with the increase in the size misfit in all alloys, and this relationship was clearly divided into two groups depending on whether the binary alloy system is a completely miscible type or a type with the solubility limit. The increment in hardness in the latter type of alloys was much higher than that of the former, and this value became larger with the increase in the inverse value of the solubility limit in Pt-based binary alloy. The superior cold workability and very similar work hardening behavior were observed in all Pt-based binary alloys.

Effect of grain size on the hardness and reactivity of plasma-sintered beryllium

“…In addition, the value of K determined for PS-Be samples is 208 Hv lm À1/2 . Similar values are reported for Pt (204 Hv lm À1/2 ) and other metals [14].…”

“…Dependence of hardness on grain size in Be and other metals as determined by the Hall-Petch relationship[14,15].…”

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

“…This assessment is consistent with the work of Murakami et al [30] on the SSH behavior of 25 solutes in binary Pt solid-solution. Based on the size-misfit and complete miscibility, Ni and Co were found to be moderate SSH solutes in Pt.…”

Role of different factors affecting interdiffusion in Cu(Ga) and Cu(Si) solid solutions

“…Then, they rationalized the possible considerations for the activation energy for interdiffusion. The size misfit parameter of a solute element, ε, that considers the lattice parameter variation with the solute addition, is expressed as [47] …”