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Metal normally solidifies when deformed at low temperature. This is a process known as work hardening. The consolidation through deformation is due to the increase in dislocation density. In contrast, tin solder loses strength when processed. This phenomenon is called work softening and it is due to the recrystallization of the deformed tin at room temperature. If deformed tin is kept at room temperature, it recrystallizes and reaches a softer condition, just like during annealing. Also, Al -Fe alloys (up to 10 % Fe) soften by forming as a result of a recrystallization at room temperature. See also Recrystallization and Dislocation.