MATLS 1M03 Study Guide - Final Guide: Austenite, Cementite, Heat Treating
8 Dec 2017
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Document Summary
Introduction: equilibrium phase diagrams are a convenient and concise way of representing the most stable relationships between phases in alloy systems. Phases: a phase is some portion of a body of material throughout which the physical and chemical characteristics are homogeneous. Microstructure: three microstructural characteristics that are important for multiphase alloys are. Phase equilibria: a system at equilibrium is in its most stable state that is, its phase characteristics do not change over time. One-component (or unary) phase diagrams for one-component phase diagrams logarithm of pressure is plotted versus temperature; solid-, liquid-, and vapor-phase regions are found on this type of diagram. Binary phase diagrams for binary systems, temperature and composition are variables, whereas external pressure is held constant. Areas, or phase regions, are defined on these temperature- versus-composition plots within which either one or two phases exist. Binary isomorphous systems: isomorphousdiagramsarethoseforwhichthereiscompletesolubilityinthesolid phase; the copper nickel system (figure 9. 3a) displays this behavior.
