Start each problem on a separate sheet of paper. Good luck! Problem 1: True or f

Question

Start each problem on a separate sheet of paper. Good luck! Problem 1: True or false (24 points): 1. The Burger's vector of a screw dislocation is perpendicular to the dislocation line. 2. Metallic bonding is directional 3. Domain walls are area defects in ferroelectric materials diffusion. 4. vacancy diffusion is normally more rapid than 5. Interstitial atoms are point defects. 6. The plane (010) in the cubic unit cells is parallel to y axis. 7. The diffusion of C in BCC iron is interstitial diffusion while the diffusion of Cin FCC iron is vacancy diffusion. 8. There are 16 Bravais lattices to describe the crystal u cell

Explanation / Answer

Answer to statement 1)

The screw dislocation is parallel to the dislocation line

Answer; false

.

Answer to statement 2)

Metallic bonding is not directional. Since metallic bonding is just like ionic bonding , where the force of negative and positives creates the attraction, this bonding can happen in any direction

Answer: False

.

Answer to statement 3)

This is correct domain walls are area defects in ferroelectric materials

Answer: True

.

Answer to statement 4)

Vacancy diffusion is not more rapid than intersitial diffusion. Vacancy diffusion happens only when there is a hole for the atom to move, where as in intersitial diffusion it slips through the wall ,and doesnot wait for the hole to be present.

Answer: False

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