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QUESTION 7 What is the composition of the a phase at the eutectic composition? 98

67

41

81

2

QUESTION 8 For a 85 Wt % Pb alloy, what are the composition of the first solid phase?

85 wt % Pb

82 wt% Pb

97 wt % Pb

41 wt % Pb

QUESTION 9 What is the composition of the last liquid remaining prior to complete solidification?

85 wt % Pb

82 wt% Pb

97 wt % Pb

41 wt % Pb

QUESTION 10 Is the phase Mg2Pb ductile brittle superplastic 1.5 points

QUESTION 11 For a 50 wt % Pb alloy at 481 oC ( assume eutectic temperature is 480 oC), what are the compositions of the liquid phase

41 % wt % Pb

82 wt % Pb

67 wt % Pb

50 wt % Pb

QUESTION 12 For a 50 wt % alloy cooled to one deg. C below the eutectic temperature, what is the total weight fraction of phase that is present? 75 wt % 24 wt % 50 wt % 64 wt % 11 wt % 1.5 points

QUESTION 13 What is the weight fraction of the phase that is present in the eutectic structure.

75 wt %

24 wt %

50 wt %

64 wt %

11 wt %

QUESTION 14 For a 38 wt% Pb alloy, what temperature would one use to solution anneal this alloy?

400 oC

550 oC

450 oC

300 oC

600 oC

QUESTION 15

The Pb- Mg phase diagrams has

one peritectic and one eutectic

two eutectics

two peritectics

two eutectics and one congruent transformation

one peritectic and one eutectic

two eutectics

two peritectics

two eutectics and one congruent transformation

Explanation / Answer

QUESTION 7 What is the composition of the a phase at the eutectic composition?

67

QUESTION 8 For a 85 Wt % Pb alloy, what are the composition of the first solid phase?

82 wt% Pb

QUESTION 9 What is the composition of the last liquid remaining prior to complete solidification?

41 wt % Pb

QUESTION 10 Is the phase Mg2Pb ductile brittle superplastic 1.5 points

IT IS SUPERPLASTIC OWING TO pB AND MG

QUESTION 11 For a 50 wt % Pb alloy at 481 oC ( assume eutectic temperature is 480 oC), what are the compositions of the liquid phase

41 % wt % Pb

QUESTION 12 For a 50 wt % alloy cooled to one deg. C below the eutectic temperature, what is the total weight fraction of phase that is present? 24 wt % 1.5 points

QUESTION 13 What is the weight fraction of the phase that is present in the eutectic structure.

11 wt %

QUESTION 14 For a 38 wt% Pb alloy, what temperature would one use to solution anneal this alloy?

600 oC

QUESTION 15

The Pb- Mg phase diagrams has

two eutectics

two eutectics

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