What is the effect of precipitation heat treatment on aluminum alloy?

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Multiple Choice

What is the effect of precipitation heat treatment on aluminum alloy?

Explanation:
Precipitation heat treatment, or age hardening, increases strength and hardness of aluminum alloys. After dissolving the alloying elements in solution heat treatment and quenching to create a supersaturated solid solution, aging allows fine precipitates to form. These tiny particles obstruct dislocation movement, making plastic deformation harder and raising yield strength, tensile strength, and hardness. Ductility typically decreases somewhat, and if aging is taken too far, overaging can reduce strength as precipitates coarsen. The process mainly enhances strength without changing density or electrical conductivity in any meaningful way.

Precipitation heat treatment, or age hardening, increases strength and hardness of aluminum alloys. After dissolving the alloying elements in solution heat treatment and quenching to create a supersaturated solid solution, aging allows fine precipitates to form. These tiny particles obstruct dislocation movement, making plastic deformation harder and raising yield strength, tensile strength, and hardness. Ductility typically decreases somewhat, and if aging is taken too far, overaging can reduce strength as precipitates coarsen. The process mainly enhances strength without changing density or electrical conductivity in any meaningful way.

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