Annealing an aluminum bar above its how working temperature for a sufficiently l

Question

Annealing an aluminum bar above its how working temperature for a sufficiently long time, and then cooling it to room temperature will:

(number of dislocations per unit volume)

increase the number of grains per unit volume

decrease the yield strength of the cooled part

decrease the toughness of the cooled part

decrease the ductility of the cooled part

produce a larger grain size

(number of dislocations per unit volume)

increase the number of grains per unit volume

decrease the yield strength of the cooled part

decrease the toughness of the cooled part

decrease the ductility of the cooled part

produce a larger grain size

Explanation / Answer

Annealing at higher temperatures results in a drop in strength (UTS) and increase in ductility (8–13%) due to the nucleation of dislocation free grains by recrystallisation.

It also produces a unifoem equiaxial large garin size due to grain growth

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