Section 3C Strengthening

Section 3C Strengthening - Section 3 STRENGTHENING...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Section 3 STRENGTHENING MECHANISMS (Smith Chapter 6.5- 6.8) What happens microstructurally during plastic deformation? ow can we ntrol e mechanical roperties f materials? How can we control the mechanical properties of materials? Stiffness (E), Strength ( yield & tensile) & Ductility ( ε fracture %) MATE 210
Background image of page 1

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

View Full DocumentRight Arrow Icon
Review of Dislocations Dislocations : localized crystal lattice distortion • seen by TEM (only high magnifications) • strain (distortion) in lattice • allow deformation with lower stress • movement of atoms slip results in plastic deformation grossly exaggerated icture (think on atomic scale): picture (think on atomic scale): MATE 210
Background image of page 2
Dislocations move in response to stress: Dislocation Movement • interatomic bonds ruptured and reformed (like caterpillar movement) • net movement of large number of atoms can occur plastic deformation results! MATE 210
Background image of page 3

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

View Full DocumentRight Arrow Icon
Slip systems Along which direction (AA or BB ) will atoms move easier? FCC {111} close packed plane high planar density MATE 210 Dislocations move along preferred direction in preferred planes !
Background image of page 4
Slip Systems in Crystalline Materials Dislocations move on preferred crystallographic planes & directions most dense atomic packed plane & direction inimum ergy (force) required for dislocation motion) ( minimum energy (force) required for dislocation motion) FCC: {111} <110> (12 slip systems ductile) BCC: {110} <111>, others some operable only at high temps: affects DBTT MATE 210 HCP: {0001} <1120> (3 slip systems stiff)
Background image of page 5

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

View Full DocumentRight Arrow Icon
MATE 210
Background image of page 6
Slip in Polycrystalline Material different grains different orientations of slip lines slip lines Polycrystalline materials are stronger and stiffer
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 20

Section 3C Strengthening - Section 3 STRENGTHENING...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online