Consider the following statements in connection with the phase diagrams: 1. Phase diagrams of binary alloys change by the presence of other alloying elements. 2. Tie-line construction and lever rule are used to determine the phase compositions. 3. Time-temperature transformations can be studied with the help of phase diagrams Which of the above statements are correct?

1 and 2 only
1 and 3 only
2 and 3 only
1, 2 and 3

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 1 : 1 and 2 only

Concept:

Phase diagram:

The graphical representation of the values of thermodynamic variables when system is in equilibrium. Thermodynamic variables changes as temperature changes.
An equilibrium phase diagram presents the phases and phase changes under equilibrium conditions, but it provides no information about the rates of transformation.
Although changes in pressure, composition or temperature can cause phase transformations, it is temperature changes that are more important.

Rate of transformation is explained in Time-Temperature-Transformation (TTT) diagram which is also known as iso-thermal diagram. An alloy has to be cooled rapidly and then kept at a temperature to allow for respective transformation to take place.

Time-temperature transformations is used to determine when transformation begin and for an constant temperature heat treatment.it is useful for only hardening process.

TTT diagrams can be studied without the help of phase diagrams

4 views Answered 2022-09-04 04:29

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