In this article we will discuss about the process of nucleation and growth of liquid metals. Suppose the temperature of the liquid metal is brought below its freezing temperature, so that solid metal x is now a stable phase. How does the solid appear, and the liquid disappear? It would be unrealistic to assume that such a change occurs all [...]
In this article we will discuss about:- 1. Introduction to Solidification 2. Structure of Crystalline Solid 3. Energetics 4. Smooth or Stable Interface-Growth 5. Temperature Inversion and Dendritic Growth 6. Dendritic Growth. Introduction to Solidification: A metallurgist is called upon to economically produce the required shape of an object, and which has the required properties. In almost all metals and [...]
A thorough understanding of the mechanism of solidification, the rate of heat loss from the material to the mould etc. is essential to predict, how the casting will solidify and thus avoid casting defects like seams, gas porosity, hot tears etc. Since, solidification requires energy to produce a crystalline structure, some super cooling (cooling below the freezing point) is required [...]