Strengthening Materials Quiz

What is the first method of strengthening a material mentioned in the video?

• Strain hardening

• Heat treatment

• Solid solution hardening

• Precipitation hardening

What is the effect of impurities in solid solution hardening?

• They increase the ductility

• They make the material more brittle

• They impede the movement of dislocations

• They decrease the tensile strength

What is the second method of strengthening a material mentioned in the video?

• Heat treatment

• Precipitation hardening

• Strain hardening

• Solid solution hardening

What is the third method of strengthening a material mentioned in the video?

• Solid solution hardening

• Strain hardening

• Precipitation hardening

• Heat treatment

What happens to the grain size of a metal when it is annealed at a higher temperature?

• The grains become smaller

• The grains become larger

• The grains remain the same size

• The grains disappear

What is the relationship between grain size and mechanical properties?

• Smaller grains make the material stronger

• Larger grains make the material stronger

• Grain size has no effect on strength

• Grain size only affects ductility

What is the effect of strain hardening on a material?

• It increases the ductility

• It increases the dislocation density

• It makes the grains larger

• It decreases the strength

What is the purpose of precipitation hardening?

• To make the material more ductile

• To increase the grain size

• To form a second well-dispersed phase

• To decrease the dislocation density

What is the first stage of precipitation hardening?

• Annealing

• Precipitation heat treatment

• Cold working

• Solution heat treatment

What is the effect of over-aging in precipitation hardening?

• It decreases the strength

• It has no effect

• It makes the material more ductile

• It increases the strength