13 thermo microstructure
DESCRIPTION
microTRANSCRIPT
Thermodynamics: Microstructure
What is a binary system? What is an isomorphous system?
In the Cu-Ni system: Microstructure development for: Co = 35wt%Ni.
Cu-Ni system
BINARY-ISOMORPHOUS SYSTEMS
• Fast rate of cooling: Cored structure
• Slow rate of cooling: Equilibrium structure
CORED VS EQUILIBRIUM PHASES
• How does solid solution affect tensile strength and ductility?
MECHANICAL PROPERTIES: Cu-Ni System
Cu-Ag system
BINARY-EUTECTIC SYSTEMS What is a eutectic system? In the Cu-Ag system: How many single phase regions? What is the major component in the α phase? What is the major component in the β phase? TE and CE
• For a 40wt%Sn-60wt%Pb alloy at 150C What are the phases present in the material? What is the composition for each phase?
Pb-Sn EUTECTIC SYSTEM (1)
What is the relative amount of each phase?
Pb-Sn EUTECTIC SYSTEM (2)
Pb-Sn system
MICROSTRUCTURES IN EUTECTIC SYSTEMS
Microstructure when Co < 2wt%Sn?
MICROSTRUCTURES IN EUTECTIC SYSTEMS-I
Microstructure when 2wt%Sn < Co < 18.3wt%Sn?
Pb-Sn system
MICROSTRUCTURES IN EUTECTIC SYSTEMS-II
Microstructure when Co = CE? Pb-Sn
system
Adapted from Fig. 9.11, Callister 6e.
MICROSTRUCTURES IN EUTECTIC SYSTEMS-III
The concept of microconstitutents?
Pb-Sn system
• Microstructure when 18.3wt%Sn < Co < 61.9wt%Sn?
MICROSTRUCTURES IN EUTECTIC SYSTEMS-IV
HYPOEUTECTIC & HYPEREUTECTIC