Give short answers Dislocations move by a phenomenon known a

Give short answers: Dislocations move by a phenomenon known as: In FCC, total number of slip systems are: Name one mechanism of Strengthening: Hall-Petch equation relates yield strength with: For screw dislocation, the relationship between the direction of the applied shear stress and the direction of dislocation line motion is Define modulus of resilience:

Solution

1. doslocations move by the phenomenon known as Slip which occurs due to application of a shear stress.

2. in FCC, total no. of slip system are 12

3. One mechanism of strengthening is Grain size Refinement,other mechanism can be cold working,solid solution strengthening etc.

4. Hell Petch equation relates yield strength with grain size.

5. For screw dislocaton, the direction of applied shear stress is parallel to the direction of disclocation movement.

6. Modulus of Resilience is the ratio of energy absorbed by the specimen upto its elastic limit to the volume.

MR=(energy upto elastic limit/Volume)