EINGINEERING MATERIALS AND METALLURGY

The eutectic point in a phase diagram is where:

• Two liquids become one solid

• Two solids coexist with one liquid

• Two phases form one phase

• One liquid and one solid coexist

A eutectoid reaction involves:

• A liquid transforming into two solid phases

• One solid phase transforming into two different solid phases

• A solid transforming into a liquid

• Two liquid phases forming one solid phase

Brass is an alloy of_______________

• Copper and tin

• Copper and zinc

• Iron and carbon

• Aluminum and copper

The iron-carbon phase diagram is important for understanding the properties of aluminum alloys. Say

• True

• False

What is the purpose of annealing?

• To soften the material

• To harden the material

• To reduce the material’s density

• To increase electrical conductivity

Quenching is a process that involves:

• Heating a metal and allowing it to cool slowly

• Heating a metal and cooling it rapidly in water or oil

• Pressing a metal into a mold

• Reducing a metal’s melting point

Suitable material for case hardening:

• Low carbon steel

• High carbon steel

• Stainless steel

• Aluminum

_______process involves the diffusion of both nitrogen and carbon into the steel surface.

Age Hardening is also called as ___________________

The composition of carbon in the iron-carbon phase diagram is:

• 0.8% carbon

• 1.7% carbon

• 6.67% carbon

• 4.3% carbon