Term
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Definition
| a region of small randomly oriented grains that form at the surface/mold wall of a casting as the result of heterogeneous nucleation |
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Definition
| a region of elongated grains having a preferred orientation that forms as a result of competitive growth during solidification of a casting |
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Definition
| the minimum size that must be formed by atoms clustering together in the liquid before the solid particle is stable and begins to grow |
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Definition
| the treelike structure of the solid that grows when an undercooled liquid solidifies |
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Definition
| a tiny particle of solid that forms from the liquid as atoms cluster together, it may grow into a stable nucleus or redissolve |
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Definition
| a region of randomly oriented grains in the center of a casting produced as a result of widespread nucleation |
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Term
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Definition
| the addition of heterogeneous nuclei in a controlled manner to increase the number of grains in a casting |
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Term
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Definition
| formation of critically sized from the liquid on an impurity surface |
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Term
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Definition
| formation of critically sized solid from the liquid by the clustering togehter of a large number of atoms at a high undercooling |
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Term
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Definition
| the addition of heterogeneous nuclei in a controlled manner to increase the number of grains in a casting |
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Term
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Definition
| a plate like arrangment of crystals within a material |
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Term
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Definition
| the heat evolved when a liquid solidifies, is related to the energy difference between the solid and the liquid |
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Term
| Local Solidification Time |
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Definition
| the time required for a particular location in a casting to solidify once nucleation has begun. |
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Term
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Definition
| the physical process by which a new phase is produced in a material, for solidification, the formation of a tiny stable solid |
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Term
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Definition
| tiny particles of solid that form from the liquid as atoms cluster together, because these particles are large enough to be stable, nucleation has occurred and growth of the solid can begin |
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Term
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Definition
| growth of a smooth solid/liquid interface when no undercooling of the liquid is present |
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Term
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Definition
| the increase in temeprature of an undercooled liquid as a result of the liberation of latent heat of fusion |
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Term
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Definition
| the pouring temperature minus the freezing temp |
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Term
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Definition
| a plateau on the cooling curve during solidification of a material caused by the evolution of the latent heat of fusion during solidification |
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Term
| Total Solidification Time |
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Definition
| the time required for the casting to solidfy compeltely after the casting has been poured |
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Term
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Definition
| the temperature below which the liquid metal must cool below the equilibrium freezing temperature before nucleation can occur |
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