Lecture note 8 (09-29-2011)

Lecture note 8 (09-29-2011) - MAE 581 Advanced Materials...

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1 MAE 581 Advanced Materials Science Lecture note 8 Phase equilibrium and structure Crystallization from the melt At some stage of production the majority of metals and alloys are melted and then allowed to solidify as a casting. The latter may be an intermediate product, such as a large steel ingot suitable for hotworking, or a complex final shape, such as an engine cylinder block of cast iron or a single-crystal gas-turbine blade of superalloy. Solidification conditions determine the structure, homogeneity and soundness of cast products and the governing scientific principles find application over a wide range of fields First, in order to illustrate some basic principles, we will consider the freezing behavior of a melt of like metal atoms. The thermal history of a slowly cooling metal is depicted in Figure 2.1; the plateau on the curve indicates the melting point (m.p.) , which is pressure dependent and specific to the metal.
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This note was uploaded on 01/16/2012 for the course MAE 581 taught by Professor Fu during the Fall '11 term at SUNY Buffalo.

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Lecture note 8 (09-29-2011) - MAE 581 Advanced Materials...

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