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Directions: Additional information to complete these problems can be found in your Examination Booklet. Use $5\mathrm{.}43\frac{g}{c}{m}^3$ as your

density for Mercury

$--$Given Values$--$

Energy for Vacancy Formation $($eV$/$atom$)$: $=0\mathrm{.}63$

Metal: $=$ Sodium

Temperature $(C)=908$

Alloy Metal $A=$ Germanium

Alloy Metal B $=$ Cadmium

Metal$-$X $=$ Nickel

Metal$-Y=$ Silver

Magnification $=170$

ASTM Grain Size $=3$

Grain per Square Inches $=21$

Calculate the fraction of atom sites that are vacant for given metal and the temperature shown above. Assume an energy for vacancy

formation shown above $($answer in Engineering Notation$)$:

Your Answer $=$

For the metal given, the equilibrium number of vacancies at $600$ C is $1{10}^{25}{m}^{-3}.$ Calculate the fraction of vacancies for this metal at

$600$ C $($answer in Engineering Notation$)$:

Your Answer $=$

Incorrect.

For an alloy that constists of $75$ at $\%$ of Alloy Metal and $25\%$ of Alloy Metal B$,$ what is the concentration of Alloy Metal A in wt $\%?$

Your Answer $=$

Incorrect.

For an alloy that constists of $75at\%$ of Alloy Metal and $25\%$ of Alloy Metal B$,$ what is the concentration of Alloy Metal B in wt $\%?$

Your Answer $=$

Incorrect.

Metal$-$X forms a substitutional solid solution with Metal$-$Y$.$ Compute the number of Metal$-$X atoms per cubic centimetier for a

Metal$-$Y$---$Metal$-$X alloy that contains $33wt\%$ Metal$-$X and $67wt\%$ Metal$-$Y$.($answer in Engineering Notation$)$:

Your Answer $=$

Incorrect.

For the ASTM Grain Size listed above, approximately how many grains would there be per square inch at $100$ magnification?

Your Answer $=$

Incorrect.

For the ASTM Grain Size listed above, approximately how many grains would there be per square inch at the listed magnification

above? $($write answer to the hundreth place$)$

Your Answer $=$

Incorrect.

For the ASTM Grain Size listed above, approximately how many grains would there be per square inch with no magnification?

$($answer in Engineering Notation$)$:

Your Answer $=$

Incorrect.

A photomicrograph was taken of a specimen at a magnification of $100$ X $,$ and it was determined that the average number of grains per

square inch was the number listed above. What is this specimen's ASTM grain size number$($write answer to the hundreth place$)?$:

Your Answer $=$

Incorrect.