Phase Diagrams and Alloy Solidification
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Questions and Answers

What is indicated by the liquidus line in a phase diagram?

  • The temperature range where liquid and solid phases coexist. (correct)
  • The temperature at which an alloy begins melting.
  • The temperature range for complete solidification.
  • The temperature range where only liquid phases exist.

    • What happens during solidification according to the cooling curve of an alloy?

  • Solidification occurs over a range of temperatures. (correct)
  • Liquid phases turn completely into solids before reaching the liquidus line.
  • Solidification occurs instantaneously at a single melting point.
  • Temperature remains constant until all solidification is complete.

    • Which statement correctly describes partial solid solubility in alloy systems?

  • There are distinct solid phases with limited solubility of each component. (correct)
  • Solid phases cannot coexist with liquid phases in these alloys.
  • Partial solid solubility results only from identical atomic structures.
  • Components are fully soluble in the solid phase regardless of composition.

    • What is the effect of different atomic characteristics of constituent metals in an alloy?

    <p>It leads to a wider temperature range for solidification. (B)</p> Signup and view all the answers

    What does the cooling curve for a pure metal illustrate compared to that of an alloy?

    <p>It presents a singular melting point with a constant temperature during solidification. (D)</p> Signup and view all the answers

    Which of the following best describes the solidus line in a phase diagram?

    <p>It indicates the temperature range for solid phases to coexist. (B)</p> Signup and view all the answers

    Which of the following statements about latent heat of fusion is true?

    <p>It represents the energy absorbed or released during phase change between liquid and solid. (C)</p> Signup and view all the answers

    In constructing a phase diagram, what is the role of cooling curves?

    <p>They provide data for plotting temperature and composition ranges. (C)</p> Signup and view all the answers

    What is a key characteristic of an alloy as opposed to a pure metal?

    <p>An alloy consists of two or more metals mixed together. (C)</p> Signup and view all the answers

    What does a wider temperature range in the cooling curve of an alloy indicate?

    <p>The presence of different energy requirements across compositions. (D)</p> Signup and view all the answers

    Flashcards

    Liquidus

    The temperature at which an alloy begins to solidify.

    Solidus

    The temperature at which an alloy is completely solid.

    Alloy

    A mixture of two or more metals.

    Latent heat of fusion

    The energy absorbed or released during a phase change between liquid and solid.

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    Phase Diagram

    A graphical representation showing the equilibrium phases of a material at different temperatures and compositions.

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    Solubility

    The ability of materials to dissolve into each other.

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    Alloy Cooling Curve

    When two or more metals form an alloy, the cooling curve exhibits a range of temperatures over which solidification occurs.

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    Liquidus Line

    The line on a phase diagram that represents the temperature range where liquid and solid phases coexist.

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    Solidus Line

    The line on a phase diagram that represents the temperature range where solid phases coexist.

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    Partial Solid Solubility

    The ability of materials to only partially dissolve in each other.

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