MIME 260 Lecture Notes - Lecture 6: Phase Diagram, Covalent Bond, Tetragonal Crystal System

• School: McGill University
• Department: Mining & Materials Engineering
• Course: MIME 260
• Professor: Mihriban. O. Pekguleryuz

Document Summary

Chapter 3 metals part b: alloys & phases, solid solution alloys, alloy phase diagrams a. Isomorphous system: phase diagram rules, solid solubility limit, eutectic system, phase diagrams with intermediate phases. Limited solid solubility (cid:1) certain elements show only limited solid solubility in a metal. Hume rothery rules only partially satisfied. (cid:1) example: limited solid solubility of zn in cu. Intermetallics are not metallic materials. (cid:1) the alloy has two phases(30-51) wt%zn: saturated -cu solid solution (30wt%zn) matrix and the cuzn intermetallic in the composition range. (cid:1) at 51wt%zn the material is entirely an intermetallic compound. Cu (cid:1) note that the limit changes with temperature. At high temperatures the solubility limit of zn in cu increases. Cuzn (cid:1) intermetallic compounds : compounds between two metals which do not follow hume- Rothery rules. (cid:1) intermetallic compounds are denoted by compound designations, e. g. al4sr, al2cu,