Chapter 11 Review

Question 1

Which ‘direction’ are the phase reactions referenced by?

Answer 1

Always going from hot to cold temperature

Question 2

Eutectic 3 Phase Reaction Point

Answer 2

L > α + β

Liquid to 2-phase solid

Tic(k) bites make one go from liquid to sickness- and not the good kind- the kind where you’re popping out solids on a porclin throne

Question 3

Peritectic 3 Phase Reaction Point

Answer 3

α + L > β

Liquid/solid slush to single solid

Question 4

Monotectic 3 Phase Reaction Point

Answer 4

L_1 > L_2 + α

Liquid to Liquid/Solid slush

Question 5

Eutectoid

Answer 5

γ > α + β

single phase solid to two phase solid

Think that one dude who got r’oids’ and went from gamma to bamma

Question 6

Peritectoid

Answer 6

α + β > γ

two phase solid to single phase solid

Think the dude who was r’oid’ ed up and quit because of all the side effects- which was tough, but he ‘per’sisted and lost a bit of solid mass but was gamma as a baby in the end.

Question 7

What is the Eutectic Point?

Answer 7

Whence one traverses from liquidus to solidus without passing through the valley of the slush-mush of death

Question 8

What is the Eutectic Composition?

Answer 8

The composition that must exist to satisfy the conditions for passing through the Eutectic point.

Question 9

What is the point of max solid solubility?

Answer 9

It is the point where we can add the most amount of alloy without steping into a 2 phase solid/liquid region. If we added an iota of alloy more, we’d break into the 3 phase region. There are 2 at either end for 2 elements.

Question 10

What is Hypoeutectic?

Answer 10

It is the region BELOW the Eutectic point.

Hypothermia > BELOW Freezing

Question 11

What is Hypereutectic?

Answer 11

It is the region ABOVE the Eutectic point.

Hyperactive > ABOVE normal activity