课件全英语版chapter10.pdf

Although the phase diagram only considers the equilibrium states, ※the phase diagram is useful in understanding the development and and preservation of nonequilibrium structures and their attendant properties, whose attendant properties are more desirable than those associated with the equilibrium state, which is illustrated later. 2021/8/30 4 10. 1 Introduction there is a strong correlation between microstructrue and mechanical properties the development of microstructure of loy is related to the characteristics of its phase diagram phase diagrams provide valuable information about melting, casting, crystallization, and other phenomena 2021/8/30 5 Topics to discuss: Terminology associated with phase diagrams and phase transformations; The interpretation of phase diagrams; Some of the common and relatively simple binary phase diagrams, luding that for the Fe-C system; The development of equilibrium microstructures, upon cooling, for several situations. 6 Definitions and Basic Concepts ☺ Component: pure metals and/or compounds of which loy is composed. e.g., Cu、Zn u-Zn brass ☺ System-1: 1、May refer to a specific body of material under consideration. e.g., a ladle of molten steel 2021/8/30 7 Definitions and Basic Concepts ☺ System-2: 2、May relate to the series of possible alloys consisting of the same components, but without regard to allo