MATLS 1M03 Study Guide - Final Guide: Work Hardening, Fracture Toughness, Hydroxylapatite
Document Summary
Phase - a chemically and physically distinct region in a material. Type i: isomorphous; a complete solubility of two components. Type ii: eutectic; limited solubility of two components. Rules for solubility: similar electronegativity, similar crystal structure, similar atomic radii. Binary eutectic systems: occur when there are two components that dissolve completely when in liquid phase but limited solubility in their solid phases. Movement within the phase diagrams; such that the phases are not in equilibrium any longer. The transformation will bring the phase back into equilibrium. Free energy reduction factors: the volume of the nucleus, the interface energy of the nucleus" surface area. *the total change in free energy is the sum of these two factors. Activation energy: the energy required for nucleation to take place. Critical nucleus radius: the radius at which the activation energy is at a maximum. If r < r* = increase in free energy - nucleus will dissolve back into liquid.