Crystal Defects, Work Hardening, Heat Treatment Review

The elongation of a metal when it is above half of its melt point and a steady force is applied to it is called?

• dislocation
• vacancy
• elastic deformation
• creep

Which of the following crystals would be the most workable?

• crystal with large grains
• crystal with small grains

Which of the following crystals would be the most workable?

• crystal with many grain boundaries
• crystal with few grain boundaries

Tags

NGSS.HS-PS2-6

in brass, some copper atoms get replaced by zinc atoms...this is called a ________________ alloy.

• substitutional 
• interstitial
• vacancy
• dislocation

Iron and carbon works well together to make a steel alloy because...

• iron and carbon are the same size
• carbon is small and fits in the interstices
• carbon and iron are equally reactive

Why does working a metal make it harder?

• it increases the number of slip planes

• it increases the number of vacancies

• it increases the # of dislocations and they get jammed at the grain boundaries

• the dislocations don't allow atoms to substitute for one another

What results from annealing steel?

• makes a metal hard and brittle

• makes a metal softer

• makes a metal hard but NOT brittle

• makes the rate of oxidation increase

Tags

NGSS.HS-PS3-4

What results from quenching steel?

• makes it softer and more workable

• makes it hard and brittle

• makes it hard but NOT as brittle

• makes it have a lower melting point

Tags

NGSS.HS-PS3-4

What results from tempering steel?

• makes it softer and more workable

• makes it hard and brittle

• makes it hard but NOT as brittle-makes it tough

• makes it very dense

What results if you quench copper?

• makes it softer and more workable
• makes it hard and brittle
• makes it hard but NOT brittle