EML4321 Quiz 2

True or False? Both pure metals and alloys have clearly defined melting and freezing points.

• True

• False

The largest amount of shrinkage occurs in which of the following stages?

• contraction of the molten metal after pouring

• solidification shrinkage during transformation of state from liquid to solid

• thermal contraction in the solid state

Grain size is associated with strength, hardness, and ductility. Large grain size leads to

• low strength, low hardness, and low ductility

• low strength, low hardness, and high ductility

• high strength, high hardness, and high ductility

• high strength, high hardness, and low ductility

Is steel a (a) interstitial solid solution or (b) substitutional solid solution?

• (a) interstitial solid solution

• (b) substitutional solid solution

Determine the amount of liquid phase for a 50%Co-50%Ni alloy at 2350°F.

• (C_O-C_L)/(C_S-C_O)

• (C_O-C_L)/(C_S-C_L)

• (C_S-C_O)/(C_O-C_L)

• (C_S-C_O)/(C_S-C_L)

What element is traditionally alloyed with copper to form brass?

• Tin

• Zinc

What is the crystal structure of pure Fe at room temperature?

• FCC

• BCC

• HCP

• FBC

What is the crystal structure of pure Fe at the temperature right before melting point?

• FCC

• BCC

• HCP

• FBC

Which structure of Fe has higher solubility of C: FCC or BCC?

• FCC

• BCC

True or False? A eutectic alloy is a particular composition in an alloy system for which the solidus and liquidus temperatures are equal.

• True
• False