Coring occurs when an alloy is cooled too quickly for diffusion to take place fully. If the alloy's diffusion is slow at lower temperatures, this coring can be virtually permanent. This phenomenon of having the "wrong" composition can be used to modify an alloy's properties.
So, if the cooling rate is too fast, the internal regions of solidifying grains will be of the composition of the phase normally found at higher temperatures. This is shown on the Coring diagram.
Associated terms: Grains, Phase
| |