2. UNIT I --ALLOYS AND PHASE
DIAGRAMS
Constitution of alloys – Solid solutions,
substitutional and interstitial – phase diagrams,
Isomorphous, eutectic, eutectoid, peritectic, and
peritectoid reactions, Iron – carbon equilibrium
diagram. Classification of steel and cast Iron
microstructure, properties and application.
6. HUME ROTHERY’S RULES
• The solute and solvent follows the following
general rules:
1. Size factor (similar size)
2. Crystal structure(same crystal structure)
3. Valence (same valence)
4. Electronegativity (approximately same electro
negativity)
7. TYPES OF SOLID SOLUTIONS
1. Substitutional solid solutions
(mixture of two elements, substitute for a
parent element)
a) Random b)Ordered
2.Interstital solid solutions
(the solute atom fit in to the space between
solvent and parent atom)