Question:
In cored structure:
In cored structure:
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Cored structures show composition gradients because solute atoms don't have enough time to redistribute during rapid cooling.
Updated On: Jun 20, 2025
- There are no composition fluctuations from core to the tip
- There are composition fluctuations from core to the tip
- Equiaxed structure
- Dendritic segregation
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The Correct Option is B
Solution and Explanation
A cored structure, also known as microsegregation, forms during non-equilibrium solidification in alloys.
As solidification progresses:
- The early solidified core of the grain becomes enriched with the higher melting point component.
- The remaining liquid becomes richer in the lower melting component and is pushed to the outer regions (towards the grain boundaries or "tip").
This leads to a composition gradient — or fluctuation — from the center of the dendrite (core) to its edge.
This occurs due to insufficient diffusion during fast solidification. It is a common problem in cast alloys and often corrected by heat treatment (homogenization).
Hence, in a cored structure, composition does vary from core to the tip.
As solidification progresses:
- The early solidified core of the grain becomes enriched with the higher melting point component.
- The remaining liquid becomes richer in the lower melting component and is pushed to the outer regions (towards the grain boundaries or "tip").
This leads to a composition gradient — or fluctuation — from the center of the dendrite (core) to its edge.
This occurs due to insufficient diffusion during fast solidification. It is a common problem in cast alloys and often corrected by heat treatment (homogenization).
Hence, in a cored structure, composition does vary from core to the tip.
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