Lecture 03/01 Flashcards
What information do phase diagrams give you?
Equilibrium state
What are unary, binary, and ternary phase diagrams?
1,2,3 components
What is a phase?
Physically or chemically distinct regions of material
What is a component?
One of the materials in an alloy
What is a solute?
Impurity added to host
What is a solvent?
Host
What is a solubility limit?
Maximum concentration of solute atoms in a solvent to form a solid solution at a specific temperature
What depends on the microstructure?
Physical properties and mechanical behavior
You can see microstructure using?
Optical or electron microscopes
What is free energy?
Function of internal energy of a system and randomness or disorder of a system (entropy)
A system is at equilibrium when it’s free energy is?
Minimum
Phase equilibrium applies when?
More than one phase may exist
What are the characteristics of a microstructure?
Phases, composition, relative phase amounts, phase spatial arrangement
What is non equilibrium or metastable?
Rate of approach to equilibrium is extremely slow
What is the triple point on a PT diagram?
3 phases coexist
What is an isomorphous system?
High mutual solubility
What is phase composition?
Concentration of components
What are the factors that affect the microstructure of an alloy?
What alloy elements exist, concentrations of the elements, heat treatment of the alloy
What is plotted in one-component phase diagrams?
Pressure vs Temp
What is plotted in binary systems?
Temp vs comp at a constant pressure
