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Chapter 9: Problem 51

What is the principal difference between congruent and incongruent phase transformations?

Short Answer

Expert verified
The principal difference between congruent and incongruent phase transformations lies in the change (or lack thereof) in the composition of the substance during the transformation. In a congruent phase transformation, the composition remains the same throughout the transformation process, while in an incongruent phase transformation, the composition changes as the transformation takes place.

Step by step solution

01

Define Congruent Phase Transformation

In a congruent phase transformation, there is no change in the composition of the substance when it transforms from one phase to another. In other words, the chemical composition of the phases involved in the transformation remains the same. Examples of congruent phase transformations include melting and freezing of pure substances like water.
02

Define Incongruent Phase Transformation

In an incongruent phase transformation, there is a change in the composition of the substance as it transforms from one phase to another. As the transformation occurs, the elements or compounds involved in the transition redistribute themselves between the phases, resulting in different chemical compositions. Examples of incongruent phase transformations are the decomposition of limestone (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2), and the eutectoid transformation in iron-carbon alloys.
03

Principal Difference Between Congruent and Incongruent Phase Transformations

The principal difference between congruent and incongruent phase transformations lies in the change (or lack thereof) in the composition of the substance during the transformation. In a congruent phase transformation, the composition remains the same throughout the transformation process, while in an incongruent phase transformation, the composition changes as the transformation takes place.

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Most popular questions from this chapter

A steel alloy contains \(95.7 \mathrm{wt} \% \mathrm{Fe}, 4.0 \mathrm{wt} \% \mathrm{~W}\), and \(0.3 \mathrm{wt} \% \mathrm{C}\). (a) What is the eutectoid temperature of this alloy? (b) What is the eutectoid composition? (c) What is the proeutectoid phase? Assume that there are no changes in the positions of other phase boundaries with the addition of \(\mathrm{W}\).

For alloys of two hypothetical metals \(\mathrm{A}\) and \(\mathrm{B}\), there exist an \(\alpha\), A-rich phase and a \(\beta\), B-rich phase. From the mass fractions of both phases for two different alloys provided in the following table (which are at the same temperature), determine the composition of the phase boundary (or solubility limit) for both \(\alpha\) and \(\beta\) phases at this temperature. $$ \begin{array}{lcc} \hline \begin{array}{c} \text { Alloy } \\ \text { Composition } \end{array} & \begin{array}{c} \text { Fraction } \\ \boldsymbol{\alpha} \text { Phase } \end{array} & \text { Fraction } \\ \hline 70 \mathrm{wt} \% \mathrm{~A}-30 \mathrm{wt} \% \mathrm{~B} & 0.78 & 0.22 \\ \hline 35 \mathrm{wt} \% \mathrm{~A}-65 \mathrm{wt} \% \mathrm{~B} & 0.36 & 0.64 \\ \hline \end{array} $$

The mass fraction of eutectoid ferrite in an ironcarbon alloy is \(0.71\). On the basis of this information, is it possible to determine the composition of the alloy? If so, what is its composition? If this is not possible, explain why.

Is it possible to have a copper-silver alloy that, at equilibrium, consists of an \(\alpha\) phase of composition \(4 \mathrm{wt} \%\) Ag \(-96 \mathrm{wt} \% \mathrm{Cu}\) and also a \(\beta\) phase of composition \(95 \mathrm{wt} \% \mathrm{Ag}-5 \mathrm{wt} \% \mathrm{Cu}\) ? If so, what will be the approximate temperature of the alloy? If this is not possible, explain why.

An intermetallic compound is found in the goldtitanium system that has a composition of \(58.0\) wt \(\%\) Au-42.0 wt \(\%\) Ti. Specify the formula for this compound.
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