Term
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Definition
| a strengthening mechanism that relies on a sequence of solid-state phase transformations in generating a dispersion of ultrafine particles of a second phase. this is same as precipitation hardening. age hardening is a form of dispersion strengthening |
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Term
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Definition
| a three-phase invariant reaction in which one liquid phase solidifies to produce two solid phases. |
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Term
| eutectic microconstituent |
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Definition
| a characteristic mixture of two phases formed as a result of the eutectic reaction |
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Term
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Definition
| a three-phase invariant reaction in which one solid phase transforms to two different solid phases |
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Term
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Definition
| a prefix indicating that the composition of an alloy is more than the composition at which a three-phase reaction occurs |
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Term
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Definition
| an alloy composition between that of the right-hand-side end of the tie line defining the eutectic reaction and the eutectic composition |
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Term
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Definition
| a prefix indicating that the composition of an alloy is less than the composition at which a three-phase reaction occurs |
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Term
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Definition
| an alloy composition between that of the left-hand-side end of the tie line defining the eutectic reaction and the eutectic composition |
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Term
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Definition
| the distance between the center of a lamella or plate of one phase and the center of the adjoining lamella or plate of the same phase |
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Term
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Definition
| a compound formed of two or more metals that has its own unique composition, structure, and properties |
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Term
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Definition
| a line on a phase diagram that shows constant chemical composition |
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Term
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Definition
| a thin plate of a phase that forms during certain three-phase reactions, such as the eutectic or eutectoid |
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Term
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Definition
| the continuous solid phase in a complex microstructure. solid dispersed phase particles may form within the matrix |
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Term
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Definition
| a phase or mixture of phases in an alloy that has a distinct appearance. frequently, we describe a microstructure in terms of the microconstituents rather than the actual phases. |
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Term
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Definition
| a region in a phase diagram in which two phases, with essentially the same structure, do not mix, or have no solubility in one another |
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Term
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Definition
| a three-phase reaction in which one liquid transforms to a solid state and a second liquid on cooling |
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Term
| nonstoichiometric intermetallic compound |
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Definition
| a phase formed by the combination of two components into a compound having a structure and properties different from either component. the nonstoichiometric compound has a variable ratio of the components present in the compound (see also intermediate solid solution) |
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Term
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Definition
| a three-phase reaction in which a solid and a liquid combine to produce a second solid on cooling |
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Term
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Definition
| a three-phase reaction in which two solids combine to form a third solid on cooling |
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Term
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Definition
| a solid phase that forms from the original matrix phase when the solubility limit is exceeded. we often use the term precipitate, as opposed to dispersed phase particles, for alloys formed by precipitation or age hardening. in most cases we try to control the formation of the precipitate second phase particles to produce the optimum dispersion strengthening or age hardening (also called the dispersed phase). |
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Term
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Definition
| a strengthening mechanism that relies on a sequence of solid-state phase transformations in generating a dispersion of ultrafine precipitates of a second phase (ch 12). this is same as age hardening. it is a form of dispersion strengthening. |
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Term
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Definition
| the microconstituent that forms before the start of a three-phase reaction |
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Term
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Definition
| (also called the proeutectic microconstituent) A solubility curve that separates a single-solid phase region from a two-solid phase region in the phase diagram |
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Term
| stoichiometric intermetallic compound |
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Definition
| a phase formed by the combination of two components into a compound having a structure and properties different from either component. the stoichiometric intermetallic compound has a fixed ratio of the components present in the compound |
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