Crystal Structures
What is the most workable crystal structure?
FCC
What does heat treating do to a metal? Name two things.
Make it easier to work
Decrease dislocations
Make more malleable
What is working a metal below its recrystallization temperature?
cold-working
Which matters more, slip planes or packing?
Slip planes.
Describe how hammering a metal affects it.
Spreads out dislocations, averages them out while thinning out material.
Makes harder to work.
Does not increase or decrease dislocations.
What is working a metal to strengthen it?
Work-hardening
Which crystal structure allows more carbon to fit into iron?
FCC
What crystal structure does iron have at room temperature?
BCC
Define heat treatment.
Heating up a metal above recrystallization temperature.
What type of defect makes steel?
What type of defect makes most other alloys?
Interstitial makes steel.
Most alloys are substitutional.
What is the Curie Temperature?
Temp at which a material loses magnetism.
What is the method of cooling a metal RAPIDLY?
Quenching.
What causes the bounce in the iron wire demo? Be SPECIFIC!!!
Solid state phase change
From BCC to FCC going down
From FCC to BCC going up
Why did the bobby pins react MORE to metal manipulations than the paperclips?
They had a higher carbon content.
What in annealing create colors on metals?
Oxidation.