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Phase Diagrams in Alloy Systems

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Questions and Answers

What is the primary reason why phase volume fractions are preferred over mass fractions in multiphase alloys?

Volume fractions are easier to calculate.

Volume fractions are more accurate.

Volume fractions may be determined from examination of the microstructure. (correct)

Volume fractions are used to estimate the mechanical properties of an alloy.

What is the relationship between the composition axis and the phase fractions computed using the lever rule?

The composition axis is scaled in mole percent.

The composition axis is scaled in volume percent.

The composition axis is scaled in atomic percent.

The composition axis is scaled in weight percent. (correct)

What is the primary use of the lever rule in phase diagrams?

To estimate the mechanical properties of an alloy.

To determine the microstructure of an alloy.

To compute mass fractions of phases. (correct)

To identify the phases present in an alloy.

What is the benefit of expressing phase amounts in terms of volume fractions?

Volume fractions can be determined from examination of the microstructure. Signup and view all the answers

How do the mechanical properties of solid isomorphous alloys change with composition?

The mechanical properties increase with increasing solute concentration. Signup and view all the answers

What is the term for the strengthening of an alloy by the presence of solute atoms?

Solid-solution strengthening. Signup and view all the answers

What is the primary advantage of using microstructure analysis in alloy development?

It provides information about the microstructure of an alloy. Signup and view all the answers

What is the definition of Va in the context of phase diagrams?

The volume fraction of the α phase. Signup and view all the answers

Why are phase diagrams useful in alloy development?

They predict the mechanical properties of an alloy. Signup and view all the answers

What is the assumption made about the temperature in the analysis of mechanical properties of solid isomorphous alloys?

The temperature is always below the melting temperature. Signup and view all the answers