Why is edge dislocation faster than screw dislocation?

Solutions

Expert Solution

Edge dislocation is faster than Screw dislocation due to associated shear stress (distortion) in case of Screw dislocation.

Berger vector indicates the direction of dislocation w.r.to slip plane. it is perpendicular to dislocation line in case of edge dislocation and parallel to dislocation line in Screw dislocation.

Helix or Spiral structure is formed in case of screw dislocation and shear stress is associated with atoms adjacent to dislocation region. This consumes more energy in compare to edge dislocation. it means less energy is required in edge dislocation than screw dislocation. Hence, edge dislocation is faster than screw disloaction.

samet mamat answered 1 year ago

Next > < Previous

Related Solutions

a) What are edge and screw dislocations and why are they important in metals?; b-) Make...

a) What are edge and screw dislocations and why are they important in metals?; b-) Make a 2D sketch of an edge dislocation using the ball and stick model of the crystalline state and show its salient features such as extra-half plane, dislocation core, state of stress above and below the slip plane, and Burger’s vector. What does the Burgers vector designate?; (c-) Why does dislocation slip take place on closed packed crystallographic planes and along close packed crystallographic directions?...

2. Why does climb motion of an edge dislocation require vacancy diffusion ?

Dislocation in metals Describe edge dislocation motion in metals from an atomic perspective. Be sure to...

Dislocation in metals Describe edge dislocation motion in metals from an atomic perspective. Be sure to clearly illustrate the sequence in which bonds are broken and reformed. Also from an atomic perspective, describe how macroscopic plastic deformation occurs by the motion of dislocations in response to an applied stress. Again, use words and visuals to explain.

Consider a straight screw dislocation parallel to a rigid surface, constrained not to deform. Show that...

Consider a straight screw dislocation parallel to a rigid surface, constrained not to deform. Show that the screw is repelled from the surface by a force equivalent to an image dislocation of the same sign and magnitude. (This example is relevant to the situation of a dislocation near a surface with a hard oxide layer upon it.)

1. Compare the energy of the crystal containing an edge dislocation with that of a crystal...

1. Compare the energy of the crystal containing an edge dislocation with that of a crystal without an edge dislocation. Which has a higher energy and why?? Determine how much higher the energy is in terms of shear modulus and burger vector

What is an edge dislocation and how does it assist in the process of slip in...

What is an edge dislocation and how does it assist in the process of slip in a crystalline metal?

. For each of edge, screw, and mixed dislocations: (a) describe and make a drawing...

. For each of edge, screw, and mixed dislocations: (a) describe and make a drawing of the dislocation; (b) note the location of the dislocation line; (c) indicate the direction along which the dislocation line extends

why is the synthesis of DNA faster than transcription?

Why is Gauss Elimination faster than solving a system of linear equations by using the inverse...

Why is Gauss Elimination faster than solving a system of linear equations by using the inverse of a Matrix? (I know it has something to do with there being less operation with Gauss elim.) Can you show an example with a 2x2 and 3x3 matrix?

Why is the use of direct marketing increasing faster than overall sales growth? (Meaning that it...

Why is the use of direct marketing increasing faster than overall sales growth? (Meaning that it is likely becoming a larger part of the overall promotional budget spend). PLEASE ANSWER IN PARAGRAPH FORM. THANK YOU! PLEASE DO NOT JUST COPY AND PASTE DIRECTLY FROM A WEB PAGE.

Subjects