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Annealing, in metallurgy and materials science, is a heat treatment that alters the physical and sometimes chemical properties of a material to increase its ductility and reduce its hardness, making it more workable.It involves heating a material to above its recrystallization temperature, maintaining a suitable temperature, and then cooling.In annealing, atoms migrate in the crystal lattice and the number of dislocations decreases, leading to the change in ductility and hardness.In the cases of copper, steel, silver, and brass, this process is performed by heating the material for a while and then slowly letting it cool to room temperature in still air.

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