FCC structure

Face Centered Cubic structure

1. Face Centered Cubic (FCC) Structure Department Of Mechanical Engineering U niversity Of Engineering & Technology Lahore Narowal Campus 1

2. Presented By: Hussnain Ahmed 2017-ME-503 Ghazanfar Ali 2017-ME-512 Nouman Ahsan 2017-ME-513 Muhammad Usman 2017-ME-514 Ali Raza 2017-ME-516 Umair Farooq 2017-ME-535 Presented To: Sir Atif Mehmood 2

3. Contents Crystal Structure Face Centered Cubic Representation of FCC Co-ordination Number Atomic Packing Factor Characteristics of FCC Examples of FCC 3

4. Crystal Structure Face Centred Cubic Structure Body Centred Cubic Structure Hexagonal Closed-packed Structure 4

5. Face Centered Cubic Structure The face centered cubic arrangement has fourteen atoms T he atoms are arranged at the corners and center of each cube face of the cell 5

6. Face Centered Cubic Structure A toms are assumed to touch along face diagonals. 6

7. Representation of FCC 2-Dimenssional: 3-Dimenssional: 7

8. Representation of FCC in 3D 8

9. Coordination No Coordination No. =12 (# nearest neighbours) 9

10. Atomic Packing Factor (APF) 10 Atomic packing factor is the factor of volume in a crystal structure that is occupied by constituent particles. It is a dimensionless quantity and always less than unity. APF =  

11. Atomic Packing Factor (APF) APF = = = Here; a Atoms in a Unit Cell: = 6 x ½ + 8 x 1/8 = 4 atoms/unit cell   11

12. Atomic Packing Factor (APF) 12

13. Characteristics of FCC They are plastic and malleable. It’s stronger and denser than BCC. The flow stress (the force required to move dislocations) is not strongly temperature dependent. Therefore, dislocation movement remains high even at low temperatures and the material remains relatively ductile. 13

14. Examples Metals with the fcc structure include: Aluminum Copper Gold Nickel Silver Iron Platinum Lead 14

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