Section 1E Diffusion

Section 1E Diffusion - Section 1 Diffusion(Smith Chapter 5...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
MATE 210 Section 1 Diffusion (Smith Chapter 5) Are atoms stationary in the crystal lattice? How do atoms move around or get transported ?
Background image of page 1

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

View Full DocumentRight Arrow Icon
MATE 210 Carburization case-hardened surface fatigue What properties are required for a gear? surface – interior – carbon diffusion Steel (Fe-C) pearlite “case” (C-enriched) microstructure of gear hard, wear resistant tough, impact resistant
Background image of page 2
MATE 210 Diffusion Mechanisms vacancy diffusion: diffusing atom and vacancy exchange positions interstitial diffusion: interstitial atom (small atom) moves within which is easier?
Background image of page 3

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

View Full DocumentRight Arrow Icon
MATE 210 Diffusion interdiffusion : different atoms diffuse into one another, concentration gradient, diffusion couple after Cu-Ni diffusion couple: before concentration profiles: self-diffusion: atoms of same type exchange positions, no net transport of atoms, no compositional change
Background image of page 4
What are some examples of diffusion? Diffusion - material transport by atomic motion • carburization (e.g., gears – wear resistance) • doping of semiconductor (ion implant) (e.g., p-n junctions) What factors influences diffusion? 9
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/02/2008 for the course MATE 210 taught by Professor Niebuhr during the Spring '05 term at Cal Poly.

Page1 / 15

Section 1E Diffusion - Section 1 Diffusion(Smith Chapter 5...

This preview shows document pages 1 - 6. Sign up to view the full document.

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