ch10.1-S09 - Chapter 10 Phase diagrams structure processing...

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MY2100 – Ch 10, Part 1, Slide 1 Chapter 10: Phase diagrams structure processing properties Performance Phase diagrams are a tool we use to understand microstructures in metals and ceramics, and how to control the microstructures during processing to obtain improved properties and performance.
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MY2100 – Ch 10, Part 1, Slide 2 ISSUES TO ADDRESS. .. Phase B Phase A Nickel atom Copper atom When we combine two elements. .. what equilibrium state do we get? In particular, if we specify. .. -- a composition (e.g., wt%Cu - wt%Ni), and -- a temperature (T) then. .. How many phases do we get? What is the composition of each phase? How much of each phase do we get?
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MY2100 – Ch 10, Part 1, Slide 3 Definitions It is extremely important that you understand these concepts. A component is the basic building block of the system. Examples: Cu and Zn are the components of brass Fe and C are the components of simple steels • MgO and Al 2 O 3 are the components of some structural ceramics The solvent is the major component, while the solute is the minor component (solute is dissolved in solvent.) The combination of all the components is called the system.
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MY2100 – Ch 10, Part 1, Slide 4 Definitions Phase, from your book: Also critical to the understanding of phase diagrams is the concept of a phase. A phase may be defined as a homogeneous portion of a system that has uniform physical and chemical characteristics. Examples: Pure metal (liquid, solid or gas); solid solution. • Quartz; Al 2 O 3 Hydrogen; oxygen; water; sugar; sugar dissolved in water Pure water vapor; water vapor dissolved in air.
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MY2100 – Ch 10, Part 1, Slide 5 Solubility limit When we add a solute to a solvent, in most systems, the solvent is able to dissolve some of the solute and maintain a single phase. After we reach the solubility limit , the solvent has been saturated , and adding any more will give two phases. Example: Add sugar to coffee. pure coffee add a little sugar add too much sugar solution of coffee + sugar (1 phase) solution of coffee + sugar solid sugar (2 phases)
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MY2100 – Ch 10, Part 1, Slide 6 Phase diagrams You studied phase diagrams in Chemistry class. In those examples, the phase diagrams usually consisted of plots of phases present as a function of pressure and temperature . For most materials processing situations, pressure is not important. The important variables are temperature , and how much of each component is present (that is, the composition) . An equilibrium phase diagram shows which phases are stable at different temperatures and compositions.
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MY2100 – Ch 10, Part 1, Slide 7 Example: coffee-sugar “phase diagram” The solubility of sugar in coffee is a function of temperature. It is easy to construct a qualitative phase diagram showing which
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This note was uploaded on 03/16/2011 for the course MY 2100 taught by Professor Staff during the Spring '08 term at Michigan Technological University.

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ch10.1-S09 - Chapter 10 Phase diagrams structure processing...

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