HW _1 - Unit Cells and Phase Diagrams

HW _1 - Unit Cells and Phase Diagrams - you who have ever...

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CEE 3020 Civil Engineering Materials Mr. Robert Moser Question 1 In the hard sphere model for an FCC structure, illustrated below, the atoms touch one another across a face-diagonal length which measures 4 R , where R is atomic radius. If the cube edge length is a , calculate the FCC unit cell volume, V c , in terms of R . Using this value, calculate the atomic packing factor (APF). How does this compare to BCC? Question 2 Consider the lead-tin phase diagram below. (The material may be familiar to those of
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Unformatted text preview: you who have ever soldered electronic equipment.) For each of the four points described, determine (a) which phases are present at the point (b) the composition of each phase, (c) the proportion of each phase, and (d) sketch the microstructure. The four points are: 1. 25 wt % tin +75 wt% lead at 170 C 2. 75 wt% tin + 25 wt% lead at 170 C 3. 5 wt% tin + 95 wt% lead at 170 C 4. 50 wt% tin + 50 wt% lead at 200C...
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HW _1 - Unit Cells and Phase Diagrams - you who have ever...

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