Difference Between BCC and FCC

BCC stands for body-centred cubic structure whereas FCC stands for face-centred cubic structure. ... Then the unit cell of FCC has 12 spheres. The key difference between BCC and FCC is that the coordination number of BCC is 8 whereas the coordination number of FCC is 12.

1. Is FCC stronger than BCC?
2. Which crystal structure is the strongest?
3. What is the difference between fcc and hcp?
4. Which packing is more efficient FCC or BCC?
5. Why is BCC more brittle than FCC?
6. Is chromium FCC or BCC?
7. Is steel a FCC or BCC?
8. Is BCC or FCC more ductile?
9. What is the atomic radius of a bcc crystal structure?
10. Why CCP is called FCC?
11. How CCP and FCC are same?
12. Is aluminum FCC or BCC?

Is FCC stronger than BCC?

FCC metals tend to have more slip systems, i.e. slip directions and slip planes than BCC. ... Thus FCC metals deform easier than BCC metals and thus they are more ductile. BCC metals are infact stronger than FCC metals.

Which crystal structure is the strongest?

Diamond is the hardest material known, while cubic boron nitride (BN) is the second-hardest. Silicon carbide (SiC) is very structurally complex and has at least 70 crystalline forms.

What is the difference between fcc and hcp?

The hexagonal closest packed (hcp) has a coordination number of 12 and contains 6 atoms per unit cell. The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell. The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell.

Which packing is more efficient FCC or BCC?

Both ccp and hcp are highly efficient lattice; in terms of packing. The packing efficiency of both types of close packed structure is 74%, i.e. 74% of the space in hcp and ccp is filled. ... The packing efficiency of simple cubic lattice is 52.4%. And the packing efficiency of body centered cubic lattice (bcc) is 68%.

Why is BCC more brittle than FCC?

BCC metals are generally more brittle. The main reason is their dislocation lattice friction stresses are higher than for FCC metals. Thus, dislocations move less readily in BCC lattices, which means less plasticity compared with FCC metals.

Is chromium FCC or BCC?

The bcc and fcc, with their higher densities, are both quite common in nature. Examples of bcc include iron, chromium, tungsten, and niobium. Examples of fcc include aluminium, copper, gold and silver.

Is steel a FCC or BCC?

Austenite is a high temperature phase and has a Face Centred Cubic (FCC) structure [which is a close packed structure]. The alpha phase is called ferrite. Ferrite is a common constituent in steels and has a Body Centred Cubic (BCC) structure [which is less densely packed than FCC].

Is BCC or FCC more ductile?

A face-centered cubic crystal structure will exhibit more ductility (deform more readily under load before breaking) than a body-centered cubic structure. The bcc lattice, although cubic, is not closely packed and forms strong metals. ... The fcc lattice is both cubic and closely packed and forms more ductile materials.

What is the atomic radius of a bcc crystal structure?

Atomic radius for BCC structure, r=4a3 =43.

Why CCP is called FCC?

Face Centered Cubic (fcc) or Cubic Close Packed (ccp) These are two different names for the same lattice. We can think of this cell as being made by inserting another atom into each face of the simple cubic lattice - hence the "face centered cubic" name.

How CCP and FCC are same?

The cubic closed packing is CCP, FCC is cubic structures entered for face. When we put the atoms in the octahedral void, the packing is of the form of ABCABC, so it is known as CCP, while the unit cell is FCC.

Is aluminum FCC or BCC?

Table 1: Crystal Structure for some Metals (at room temperature)