Dislocation

Question 1

What is crystal orientation?

Answer 1

Refers to orientation of the crystal lattice with respect to a coordinate system fixed in the sample.

Question 2

What are the angles of misalignment?

Answer 2

-High angle grain boundary (obtuse)
-Low angle grain boundary (acute)

Question 3

What are dislocations?

Answer 3

1D or line defects in crystals which are responsible for low yield stress

Question 4

What are the types of dislocations?

Answer 4

-Edge dislocation
-Screw dislocation

Question 5

What is dislocation motion?

Answer 5

Within metals, plastic deformation occurs by a slip where an edge dislocation (extra half plane of atoms) slides over an adjacent plane (half plane of atoms)

Question 6

What is the dislocation density?

Answer 6

The total dislocation is the length per unit volume or the number of dislocations that intersect a unit area of a random section.

Question 7

What is a slip plane?

Answer 7

The plane on which the easiest slippage occurs.
+Highest planar densities of atoms and large interplanar
spacings

Question 8

What is a slip direction?

Answer 8

The direction of movement in which slip would occur, has the highest linear density