Chapter 9 Phase Diagram

Question 1

What are alloys ?

Answer 1

Alloys are mixture of elements depending on the mixture everything can change properties such as mechanical electrical and chemical.

Question 2

What does dissolution of element depends on ?

Answer 2

Concentration and temperature.

Question 3

What is liquid solution ?

Answer 3

Mixing of two things solute ( ingredients added to the matrix they are interstitial and substitutional . Solvent is the matrix solutes are added too.

Question 4

What is solid solution ?

Answer 4

Mixing of solids ( via chemical reactions) I.e diffusion

Question 5

What is given by
solubility limit?

Answer 5

Amount of solute that can be dissolved in a solvent is given by the solubility limit. This depends on the of the temperature and concentration.

Question 6

What is it resulting graph of concentration and temperature called?

Answer 6

Phase diagram

Question 7

What does solubility defines ?

Answer 7

Solubility defines the region where phase exist.

Question 8

What is difference between phases ?

Answer 8

So phases are different based on their chemistry and or / physical arrangement in the mixture.

Question 9

What can be seen on phase diagram ?

Answer 9

Solid solution: alpha beta ( lower case )
Solidus line. Below this temp, the material is solid . Liquid line above this temp material is liquid

Question 10

What can we get out of phase diagram ?

Answer 10

A phase diagram is a graphical representation that shows the relationship between the phases of a substance (solid, liquid, gas) at different temperatures and pressures. Here are some key insights you can gain from a phase diagram:

1. Phase Regions: It clearly delineates the regions where different phases exist, helping to identify whether a substance is solid, liquid, or gas under specific conditions.
2. Phase Transitions: You can identify the conditions under which phase transitions occur, such as melting, boiling, or sublimation, and see how these transitions depend on temperature and pressure.
3. Triple Point: The point where three phases coexist can be observed, providing crucial information about the unique conditions under which all three phases are stable.
4. Critical Point: This indicates the end of the liquid-gas phase boundary, beyond which the substance exhibits properties of both phases, helping to understand phenomena like supercritical fluids.
5. Clarity on Stability: Phase diagrams show which phase is thermodynamically stable under certain conditions, aiding in the study of material properties and behaviors.
6. Compositions: In multi-component systems, phase diagrams can show how different compositions affect phase behavior, useful in alloy design and chemical reactions.
7. Temperature and Pressure Dependence: They highlight how changes in temperature and pressure can influence the stability and existence of different phases.

Overall, phase diagrams are invaluable in fields like chemistry, materials science, geology, and engineering for understanding material behavior and guiding experimental design.

Question 11

Describe the process of the (1) “which phase are present at which temperature and pressure combination.

Answer 11

Phase present (easiest) locate the material asked in the question then read the weight percent then read the temperature than match the common point.

Question 12

Describe the process for combination of phase.

Answer 12

1) find the temp of interest
2) draw a horizontal line
3) read off where the line intersects

Question 13

list the step for
The weight fraction of each phase.

Answer 13

1) construct the line at given temperature and given concentration
2) The overall ally composition is located on the tie-line
3) identify the regions (segments) corresponding to the 2 phase the weight fraction is calculated

“opposite line”/”total tie-line”

Question 14

Is liquid a primary phase ?

Answer 14

No liquid is not a primary state.

Question 15

what happens to liquid at the eutectic point?

Answer 15

At the eutectic point, a liquid is transformed directly into solid mixture of two distinct solids

Question 16

what is the temp at which liquid is directly transformed into a solid mixture called ?

Answer 16

The temp at which rxn takes place is called the “eutectic isotherm “.

Question 17

What are the phases forming above and below the eutectic isotherm called?

Answer 17

Any phase forming above the eutectic isotherm are called primary (pro-eutectic). Below the eutectic temp the phases are called total.