section%206.1%20-%20Mixtures%201

section%206.1%20-%20Mixtures%201 - Chapter 6:...

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Chapter 6: Microstructure: Phase Diagrams 6.1 Defining Mixtures Objectives Given a mixture of substances, identify the components and phases present. Define solubility limit. Up to this point we have considered primarily pure substances, with an occasional impurity atom thrown in. But in reality materials that are used in engineering are complex mixtures that are rarely homogeneous. We need to have some way of talking about these complex mixtures, and even more we need a way to predict what the mixture actually looks like. From your basic chemistry and physics classes you are familiar with the concept of states of matter. For example, water exists as a gas, liquid, or solid, and the properties of water depend on which state of matter it is in. The same kind of situation occurs for engineering materials, but our concept of “state of matter” needs to be expanded to deal with their complexity. To begin, we will consider three simple mixtures: water with a little bit of sugar in it; water with a lot of sugar in it; and water mixed with oil (see Figure 6.1.1). Figure 6.1.1: Three different kinds of solutions. Left: Sugar completely dissolved in water;
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This note was uploaded on 03/30/2010 for the course EMA 3010 taught by Professor Unknown during the Spring '08 term at University of Florida.

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section%206.1%20-%20Mixtures%201 - Chapter 6:...

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