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Definition
| Components are pure metals and/or compounds of which an alloy is composed. |
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| May refer to a specific body of material under consideration. Or it may relate to the series of possible alloys consisting of the same components, but without regard to alloy composition. |
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| For many alloy systems and at some specific temperature, there is a maximum concentration of solute atoms that may dissolve in the solvent to form a solid solution. |
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| A phase may be defined as a homogenous portion of a system that has uniform physical and chemical characteristics. |
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| The state of a system in which the phase characteristics remain constant over indefinite time periods. At equilibrium the free energy is a minimum. |
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| A function of the internal energy of a system and also the randomness or disorder of the atoms or molecules ( or entropy). |
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| Equilibrium as it applies to systems in which more than one phase may exist. This is reflected by a constancy with time in the phase characteristics of a system. |
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Definition
| The state of equilbrium is never completely achieved because the rate of approach to equilibrium is extremely slow; such a system is said to be in a nonequilibrium. |
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Definition
| A graphical representation of the relationships among environmental constraints, composition, and regions of phase stability, ordinarily under conditions of equilibrium. |
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Definition
| Having the same structure. In the phase diagram sense, isomophicity means having the same crystal structure or complete solid solubility for all compositions. |
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Definition
| For an alloy having composition and temperature located in a two-phase region, the situation is more complicated. One may imagine a series of horizontal lines, one at every temperature or sometimes as an isotherm. |
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Definition
| A mathematical expression, such as Equation 9.1b or Equation 9.2b, whereby the relative phase amounts in a two-[phase alloy at equilibrium may be computed. |
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