Question

The solidification of an alloy from one phase to another phase without changes in chemical composition is called:

• A. Eutectic reaction
• B. Allotropy
• C. Congruent transformation
• D. Homogenization

Hint:

In metallurgy, congruent transformation ensures that no chemical composition change occurs during phase transition. Understanding this concept helps in controlling the properties of alloys during processing.

Answer 1

The Correct Option is C

The process of solidification where an alloy changes from one phase to another without changes in its chemical composition is known as congruent transformation. During this transformation, the phase change occurs at a constant composition and temperature, maintaining the same chemical makeup. This is different from other phase transformations such as eutectic reactions, which involve the formation of two phases from a single phase with a change in composition. Congruent transformation is critical in processes like the solidification of certain alloys, ensuring stable phase structures.