ch9 - V Phase Diagrams Phase V Transformations in Metal...

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1 V. Phase Diagrams & Phase V. Phase Diagrams & Phase Transformations in Metal Alloys Transformations in Metal Alloys Taipei 101 Chapters: 9, Parts of 10,11 Building Structures

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2 Automotive Industry Aluminum foam for shock absorption
3 Aerospace Industry Pratt and Whitney F119 Engine F/A22 Raptor Single-Crystal Titanium panels

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4 Uses of Alloys in Aerospace
5 Phase Diagrams Chapter 9 ¾ What you should understand by the end of this chapter: ± The importance of binary phase diagrams. ± The difference between a component and a phase . ± How to interpret a binary phase diagram: ² identification of phases ² Composition/concentration of each phase ² amount of each phase ± How to use phase diagrams to predict microstructure . ± The basis of the Fe-C phase diagram.

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7 Solid Solubility ¾ We define solubility as the maximum equilibrium concentration of a solute in a host material. ALS: What is the solubility of sugar in water at 20 o C? Answer: 65 wt% sugar.

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8 Solid Solubility ¾ We define solubility as the maximum equilibrium concentration of a solute in a host material. Previous Answer: 65 wt% sugar. ALS: If you have 1 L (1000 g) of water, how much sugar can you dissolve in it? a) 650 g of sugar b) 2000 g of sugar c) 1350 g of sugar
9 Solid Solubility ¾ We define solubility as the maximum equilibrium concentration of a solute in a host material. Previous Answer: 65 wt% sugar. ALS: If you have 1 L (1000 g) of water, how much sugar can you dissolve in it? Answer: The solution is 65% (about 2 /3) sugar and 1 /3 water. The weight of the sugar is twice that of the water, so 2000 g is the answer.

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10 Alloys ¾ An alloy contains 2 or more components . ± Alloys are defined by a composition which expresses how much of each element is present: ² mild steel (Fe, 0.4% C, 0.75% Mn) ² 304 stainless steel (Fe, 0.08% C, 19% Cr, 9.25% Ni, 2% Mn) ² 6061 aluminum alloy (Al, 1.2% Mg, 0.6% Si, 0.3% Cu, 0.2% Cr) ² lead solder (60% Sn, 40% Pb) ¾ Alloys can have more than one phase . ± If all of the alloying elements are soluble in the host material in all concentrations you get a single phase alloy . ² This is also called a solid solution .
11 ALS: Solubility Limits If you leave a saturated water/sugar solution open to the air and the water starts to evaporate, what will happen? Answer: At some point there won’t be enough water to hold all of the sugar. The solubility for sugar will be exceeded , and some of it will come out of the solution in crystal form (i.e. precipitate ) to compensate.

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12 Phases ¾ A phase is a homogeneous part of a system which exhibits uniform physical and chemical characteristics. ¾ Phases exist over a range of compositions, temperatures (and pressures). ¾ Example: water-sugar ± two phases: ² essentially pure solid sugar ² water-sugar liquid solution
13 Characteristics of Phase ¾ Phase depends on physical state.

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This note was uploaded on 09/28/2011 for the course 1M03 material 1 taught by Professor Llllll during the Spring '11 term at McMaster University.

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ch9 - V Phase Diagrams Phase V Transformations in Metal...

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