{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture07-Notes - ME 382 Lecture 07 DEFECTS AND...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
ME 382 Lecture 07 1 D EFECTS AND M ICROSTRUCTURE Point, interfacial & line defects in crystals Any region where order of crystal is broken Control structure-sensitive properties Point defects Defects limited to isolated lattice sites Vacancies: Missing atoms from crystal lattice (regions of tension) Interstitials: Extra atoms squeezed into crystal lattice (compression) Lattice may locally distort around defect, resulting in a displacement of atoms from equilibrium position local regions of stress Vacancies tensile stresses Interstitials compressive stresses Interfacial defects Defects in a plane Grain boundaries: Disordered region between grains
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
ME 382 Lecture 07 2 Twin boundaries: Portions of lattice related to each other by simple rotation Net result of twinning is shear deformation Note that plastic deformation is a permanent shear deformation (occurs in response to shear stresses change of shape not volume)
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}