Before revision: Both of these contribute to the instability in substitutional alloys, while interstitial alloys are only affected by the increase in mobile dislocation densities.Ananthakrishna, G. (2007)"Current theoretical approaches to collective behavior of dislocations", Physics Reports 440:113–259 History While the effect is named after Portevin and Le Chatelier, they were not the first to discover it.
After revision: AlbertBoth of these contribute to the instability in substitutional alloys, while interstitial alloys are only affected by the increase in mobile dislocation densities.Ananthakrishna, G. (2007)"Current theoretical approaches to collective behavior of dislocations", Physics Reports 440:113–259 History While the effect is named after Portevin and Le Chatelier, they were not the first to discover it.