$--$Given Values$--$

Energy for Vacancy Formation $($eV$/$atom$)$: $=0\mathrm{.}53$

Metal: $=$ Beryllium

Temperature $(C)=891$

Alloy Metal $A=$ Germanium

Alloy Metal B $=$ Lead

Metal$-$X $=$ Potassium

Metal$-Y=$ Cesium

Magnification $=122$

ASTM Grain Size $=2$

Grain per Square Inches $=12$

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 $=$

Incorrect.

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 $=$

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 $75$ at$\%$ 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 $67$ wt $\%$ Metal$-$Y$.($answer in Engineering Notation$)$:

Your Answer $=$

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

magnification?

Your Answer $=$

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 $=$

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 $=$

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