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Grain boundary strengthening

Which of the following is a common strengthening mechanism in metals?

Increases strength

What is the effect of reducing grain size on the strength of a material?

Thermal expansion

Which of the following is NOT a strengthening mechanism?

To relieve internal stresses

What is the main purpose of annealing a metal?

Annealing

Which process involves heating a material to a high temperature and then cooling it slowly?

Increases strength and hardness

What is the effect of cold working on the mechanical properties of a metal?

Crack strength

Increases fracture toughness

How does an increase in crack size affect the fracture toughness of a material?

Directly proportional

What is the relationship between applied stress and fracture toughness for a given crack size?