Lecture 03/01

Question 1

What information do phase diagrams give you?

Answer 1

Equilibrium state

Question 2

What are unary, binary, and ternary phase diagrams?

Answer 2

1,2,3 components

Question 3

What is a phase?

Answer 3

Physically or chemically distinct regions of material

Question 4

What is a component?

Answer 4

One of the materials in an alloy

Question 5

What is a solute?

Answer 5

Impurity added to host

Question 6

What is a solvent?

Answer 6

Host

Question 7

What is a solubility limit?

Answer 7

Maximum concentration of solute atoms in a solvent to form a solid solution at a specific temperature

Question 8

What depends on the microstructure?

Answer 8

Physical properties and mechanical behavior

Question 9

You can see microstructure using?

Answer 9

Optical or electron microscopes

Question 10

What is free energy?

Answer 10

Function of internal energy of a system and randomness or disorder of a system (entropy)

Question 11

A system is at equilibrium when it’s free energy is?

Answer 11

Minimum

Question 12

Phase equilibrium applies when?

Answer 12

More than one phase may exist

Question 13

What are the characteristics of a microstructure?

Answer 13

Phases, composition, relative phase amounts, phase spatial arrangement

Question 14

What is non equilibrium or metastable?

Answer 14

Rate of approach to equilibrium is extremely slow

Question 15

What is the triple point on a PT diagram?

Answer 15

3 phases coexist

Question 16

What is an isomorphous system?

Answer 16

High mutual solubility

Question 17

What is phase composition?

Answer 17

Concentration of components

Question 18

What are the factors that affect the microstructure of an alloy?

Answer 18

What alloy elements exist, concentrations of the elements, heat treatment of the alloy

Question 19

What is plotted in one-component phase diagrams?

Answer 19

Pressure vs Temp

Question 20

What is plotted in binary systems?

Answer 20

Temp vs comp at a constant pressure