Introduction to solid state
phase transformation
R.Arul Vigneswar
7/12/2013 Summer intern seminar 1
Phase
• “Physically distinct, chemically homogeneous and mechanically
separable part of a system”
• Involves
I. State of a...
Atom movements
• Movements over
a. A large number of interatomic distance (ex. Long range diffusion)
b. One or two interat...
Types
• Change in composition
7/12/2013 Summer intern seminar 4
α α1 + α2
FCC FCC FCC
39.5 21 56
Structure
Zn,at.%
• Change in crystal structure
7/12/2013 Summer intern seminar 5
δ Fe γ Fe α Fe1392°C 911°C
Structure BCC FCC BCC
• Compositional and crystal structure changes
7/12/2013 Summer intern seminar 6
α supersat α sat + θ
Structure FCC FCC BCT...
• Change in order
7/12/2013 Summer intern seminar 7
• Electronic transitions
I. Curie temperature in Iron (769°C)
II. Neel temperature in MnO (-157°C)
7/12/2013 Summer intern...
Homogeneous and heterogeneous
transformations
• Homogeneous transformation- takes place simultaneously in all parts
• Hete...
Reference
7/12/2013 Summer intern seminar 10
Upcoming SlideShare
Loading in …5
×

5 6 13 intro to solid state phase transformation

371 views

Published on

A brief introduction to solid state phase transformation

Published in: Education, Technology, Business
  • Be the first to comment

5 6 13 intro to solid state phase transformation

  1. 1. Introduction to solid state phase transformation R.Arul Vigneswar 7/12/2013 Summer intern seminar 1
  2. 2. Phase • “Physically distinct, chemically homogeneous and mechanically separable part of a system” • Involves I. State of aggregation II. Composition III. Crystal structure IV. Electronic structure 7/12/2013 Summer intern seminar 2
  3. 3. Atom movements • Movements over a. A large number of interatomic distance (ex. Long range diffusion) b. One or two interatomic distance (ex. Short range diffusion) c. Fraction of interatomic distance (ex. Diffusionless changes) 7/12/2013 Summer intern seminar 3
  4. 4. Types • Change in composition 7/12/2013 Summer intern seminar 4 α α1 + α2 FCC FCC FCC 39.5 21 56 Structure Zn,at.%
  5. 5. • Change in crystal structure 7/12/2013 Summer intern seminar 5 δ Fe γ Fe α Fe1392°C 911°C Structure BCC FCC BCC
  6. 6. • Compositional and crystal structure changes 7/12/2013 Summer intern seminar 6 α supersat α sat + θ Structure FCC FCC BCT Cu,wt.% 4.5 0.3 52 Austenite Ferrite + Cementite FCC BCC Orthorhombic 0.8 0.02 6.69 Structure C,wt.%
  7. 7. • Change in order 7/12/2013 Summer intern seminar 7
  8. 8. • Electronic transitions I. Curie temperature in Iron (769°C) II. Neel temperature in MnO (-157°C) 7/12/2013 Summer intern seminar 8
  9. 9. Homogeneous and heterogeneous transformations • Homogeneous transformation- takes place simultaneously in all parts • Heterogeneous transformation- nucleation and growth type 7/12/2013 Summer intern seminar 9
  10. 10. Reference 7/12/2013 Summer intern seminar 10

×