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05 Phase Diagrams and Phase Transformations Online Quiz Questions

Use this free practice quiz with 20 questions to review 05 Phase Diagrams and Phase Transformations, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

True or false: An equilibrium phase diagram alone determines how quickly a material transforms during cooling.

  1. A

    True

  2. B

    False

02
Choose one
1 point

In a binary alloy, what is present in the region between the solidus and liquidus?

  1. A

    The alloy is entirely liquid.

  2. B

    Liquid and solid coexist.

  3. C

    The alloy is entirely solid.

  4. D

    Two solid phases must coexist.

03
Fill in the blank
1 point

If cooling is slow enough for diffusion to keep pace with transformations, the material approaches .

04
Choose one
1 point

What does the solvus boundary indicate in a binary phase diagram?

  1. A

    It marks the temperature above which an alloy is entirely liquid.

  2. B

    It marks the boundary below which an alloy is entirely solid.

  3. C

    It separates a single solid solution from a region with two coexisting solid phases.

  4. D

    It gives the overall composition of a two-phase alloy.

05
Written response
1 point

What hard, nonequilibrium structure can form when austenite is quenched sufficiently rapidly?

06
True or false
1 point

True or false: At the eutectic composition and temperature, one liquid can transform simultaneously into two solid phases.

  1. A

    True

  2. B

    False

07
Fill in the blank
1 point

In a two-phase region, a horizontal at the temperature of interest gives the compositions of the coexisting phases at its endpoints.

08
Choose all
1 point

Select all statements that correctly describe heat-treatment effects.

  1. A

    Annealing generally promotes recovery and recrystallization, reducing effects of prior deformation.

  2. B

    A sufficiently rapid quench forms martensite through extensive long-range diffusion.

  3. C

    Solution treatment can dissolve alloying elements at elevated temperature.

  4. D

    A later aging hold can form fine precipitates that often increase strength.

09
Written response
1 point

Near the eutectoid composition, what is the name of the layered microstructure commonly formed from ferrite and cementite during slow cooling?

10
Choose one
1 point

An alloy has overall composition C0=40C_0=40 wt% B in a two-phase α+β\alpha+\beta region. The tie-line endpoints are Cα=20C_\alpha=20 wt% B and Cβ=80C_\beta=80 wt% B. Using the lever rule, what is the fraction of the alloy that is phase α\alpha?

  1. A

    23\frac{2}{3}

  2. B

    13\frac{1}{3}

  3. C

    12\frac{1}{2}

  4. D

    34\frac{3}{4}

11
Choose all
1 point

Select all factors that can influence the microstructure formed during a thermal process.

  1. A

    Thermodynamic driving force

  2. B

    Diffusion, nucleation, and growth kinetics

  3. C

    Equilibrium phase boundaries alone, regardless of processing history

  4. D

    Cooling rate

12
Choose one
1 point

What typically happens as an off-eutectic alloy cools through solidification?

  1. A

    It transforms entirely into the eutectic mixture before any solid forms.

  2. B

    It first forms a primary solid phase, then its remaining liquid transforms into the eutectic mixture.

  3. C

    It remains entirely liquid until it transforms directly into one solid phase.

  4. D

    It forms two solid phases only by a solid-state eutectoid reaction.

13
Open ended
1 point

Compare the microstructures that can form when austenite steel is cooled slowly versus quenched sufficiently rapidly. Explain how cooling rate and diffusion account for the difference.

14
Choose one
1 point

Which description best explains the purpose of tempering martensitic steel?

  1. A

    It dissolves alloying elements at elevated temperature to prepare for aging.

  2. B

    It transforms austenite into martensite by quenching.

  3. C

    It reheats martensitic steel below the austenite range, reducing brittleness while retaining useful strength.

  4. D

    It promotes grain growth by holding steel at high temperature.

15
Choose one
1 point

At a fixed composition, a point lies between the solidus and liquidus on a binary phase diagram. Which condition does this indicate?

  1. A

    The alloy is entirely liquid.

  2. B

    Liquid and solid coexist.

  3. C

    The alloy is entirely solid.

  4. D

    Two solid phases must coexist.

16
Choose one
1 point

Which transformation occurs when a binary alloy at its eutectic composition cools through the eutectic temperature?

  1. A

    One solid transforms into a different solid and a liquid.

  2. B

    Liquid and one solid form a different solid.

  3. C

    One liquid transforms into two solid phases simultaneously.

  4. D

    Two solid phases combine to form a liquid.

17
True or false
1 point

Two alloys have the same composition and temperature but different cooling schedules. An equilibrium phase diagram alone is sufficient to determine how quickly each alloy transforms.

  1. A

    True

  2. B

    False

18
Written response
1 point

Rapid cooling leaves composition gradients within a solidifying alloy. What is this condition called?

19
Choose one
1 point

An off-eutectic alloy cools toward its eutectic temperature. Which sequence describes its solidification?

  1. A

    A primary solid forms first, then the remaining liquid forms a eutectic mixture.

  2. B

    The entire alloy forms a eutectic mixture at one temperature without any earlier solid formation.

  3. C

    The alloy remains liquid until it forms only one solid phase.

  4. D

    Two solid phases form first, and the remaining material melts.

20
Written response
1 point

Which type of diagram helps predict transformations that occur as a material cools continuously?