Mats lecture 7 Flashcards
Crystal Structure of Metals
1
Q
Which direction does the Close-Packed Direction in a FFC unit cell run?
A
-Diagonally across the face of the cell
2
Q
How many atoms are there per unit cell for a FCC?
A
-4 atoms/unti cell
3
Q
What is the lateral length of a FCC cell (a)?
A
2(2^1/2)R
4
Q
How many atoms are contained in a HCP unit cell?
A
-6 atoms
5
Q
What is the Atom Packing Factor (APF) of a FCC unit cell?
A
0.74
6
Q
What is the Atom Packing Factor (APF) of a HCP unit cell?
A
0.74 (same as FCC unit)
7
Q
-List the Crystal Structures of Metals?
A
-FCC
-HCP
-BCC
8
Q
Which of the Crystal Structures of Metals are close packed crystals?
A
-FCC
-HCP
9
Q
Which of the Crystal Structures of Metals are non- close packed crystals?
A
-BCC
10
Q
-What is the average Atomic Packing Factor of amorphous materials?
A
0.64
