Lecture_32 - MM322 Deformation and Fracture Dislocation Climb Dislocation Climb Edge dislocation moves out of its slip plane Diffusion of vacancies is

Lecture_32 - MM322 Deformation and Fracture Dislocation...

This preview shows page 1 - 4 out of 9 pages.

1 MM322 Deformation and Fracture Chapter 5: Dislocation Theory Dislocation Climb Dislocation Climb : Edge dislocation moves out of its slip plane Diffusion of vacancies is required for climb Climb is important at higher temperatures Positive Climb : Extra half plane moves above the slip plane Diffusion of vacancies into dislocation Formation of interstitials near dislocation and diffuse out of dislocation Negative Climb : Extra half plane moves below the slip plane Formation of vacancies near dislocation and diffuse out of dislocation Diffusion of interstitials into dislocation
Image of page 1
2 MM322 Deformation and Fracture Chapter 5: Dislocation Theory Dislocation Climb Volume change due to climb Positive climb: dv < 0 Negative climb: dv > 0 Number of point defects required for climb = dv/ Climb of short section of dislocation Æ Formation of Jogs Climb process: Nucleation and motion of jogs Jogs are sources and sinks of vacancies
Image of page 2
3
Image of page 3
Image of page 4

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

    </