Q.Differentiate between a substitutional solid solution and an interstitial solid solution, giving one metallurgical example of each.

[!TLDR] A substitutional solid solution has solute atoms replacing solvent atoms in the lattice (e.g. brass); an interstitial solid solution has small solute atoms fitting into the gaps between solvent atoms (e.g. steel). [!ANSWER] Substitutional: solute atoms of similar size directly replace sol …

A substitutional solid solution forms when solute atoms, similar in size and chemical character to the solvent atoms, directly take the place of solvent atoms at regular lattice sites — brass, in which zinc atoms replace copper atoms in the copper lattice, is the standard example. An interstitial solid solution forms instead when the solute atoms are considerably smaller than the solvent atoms, small enough to fit into the empty interstitial spaces between the solvent atoms without displacing any of them — steel, in which small carbo …

Compare atomic size and lattice fit: similar-sized atoms substitute directly; much sm …

Do not assume any two metals mixed together automatically form a substitutional alloy — atomic size compatibility (the Hume-Rothery size rule) genuinel …