Solidification of Metals and Alloys

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Presentation transcript:

Solidification of Metals and Alloys The solidification divided into three types: 1-At constant temperature (pure metals and eutectic alloys) 2-Over a temperature range (solid solutions) 3-By a combination of solidification over a temperature range followed by constant temperature freezing

Solidification of Pure Metals A pure metal solidifies at a constant temperature equal to its freezing point, which is the same as its melting point. The melting points of pure metals are well known and documented.

Solidification of Alloys 1-Usually, the freezing of alloys occurs over a temperature range. 2-The composition of the solid which separates first is different from that of the liquid. 3-There may be more than one solid phase crystallizing from the liquid.

Solidification Mode Alloys can be classified into three types based on their freezing ranges: Short freezing range : liquidus- to- solidus interval < 50oC Intermediate freezing range : interval of 50 to 110oC Long freezing range : interval > 110oC