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ENGMP211 > Phase Diagrams > Flashcards

Phase Diagrams Flashcards

1
Q

What are Phase fields?

A

Areas on the phase diagrams bordered by phase boundary lines.

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2
Q

What is the liquidus line?

A

A line in which everything above is in the liquid phase.

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3
Q

What is the solidus line?

A

A line in which everything below is in solid phases.

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4
Q

What is the Solvus line?

A

A line that represents a solubility limit

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5
Q

How do we find the mass fraction of liquid and how do we find the mass fraction of solids using the lever rule

A
  1. Take a line horizontally across to the phase lines
  2. Find the length of the line, this is S+L
  3. Find the length of the line on each side of the point, S and L, S being the line connected to the S phase and L being the line connected to the L phase
  4. Use the following formulas to find the mass fractions
    Mf of L = S/(S+L)
    Mf of S = L/(S+L)
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6
Q

What is the terminal solid solution?

A

Phase region near the extremes of composition, Against a 100% edge

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7
Q

What is the intermediate solid solutions?

A

Phase regions in the middle of a phase diagram and do not contact a 100% edge.

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8
Q

What are Congruent transformations

A

Phase change with no change in composition

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9
Q

What are incongruent transformations

A

Phase change where one or more phases changes composition.

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10
Q

What does Hypoeutectic mean?

A

Compositions to the left of the eutectic composition.

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11
Q

What does Hypereutectic mean?

A

Compositions to the right of the eutectic composition.

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12
Q

What does Proeutectic mean?

A

solids (sometimes grains) which form before the eutectic solidification reaction during cooling of the liquid.

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13
Q

What is Eutectic?

A

1 phase to 2 phase transition with liquid

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14
Q

What is Eutectoid?

A

1 phase to 2 phase transition no liquid

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15
Q

What is Peritectic?

A

2 phases to 1 phase transition with liquid

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16
Q

What is Peritectoid?

A

2 phases to 1 phase transition no liquid

17
Q

What is the Gibbs Phase rule?

A

Gibbs states that the number of phases plus the degrees of freedom must equal the number of components plus 2

18
Q

Draw a complete solid solubility phase diagram

A

Liquid on top
Alpha + liquid in middle ellipse
alpha on bottom

19
Q

Draw a complete solid insolubility phase diagram

A

Alpha + beta on bottom
liquid on top
Eutectoid in middle
(underline v shape)

20
Q

Draw a partial solid solubility phase diagram

A

Liquid on top
alpha to left, beta to right
Alpha +beta bottom middle
eutectoid in the middle

21
Q

What is a solid solution?

A

is where impurity atoms have been added, but the crystal structure of the host is retained.

22
Q

What are the 2 ways a solid solution can happen

A

Interstitial and substitutional

ENGMP211 (9 decks)

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