The recrystallization behaviour of a particular metal alloy is specified in terms of recrystallization temperature, which is typically 1/3rd of the absolute melting temperature of a metal or an alloy and depends on several factors including the amount of 1. cold working and purity of the metal and alloy 2. hot working and purity of the metal and alloy Which of the above is/are correct?

Option 1 : 1 only

Concept:

Recrystallization: During recrystallization a new set of strain-free and equi-axed grains form that have relatively low dislocation densities. The metal becomes softer, weaker, and more ductile. The driving force for recrystallization is the difference in internal energy between strained and recrystallized material. For a cold-worked metal that experiences recrystallization, as temperature increases (at constant heat-treating time), tensile strength decreases and ductility increases. The recrystallization temperature of a metal alloy is that temperature at which recrystallization reaches completion in 1 h.

Two factors that influence the recrystallization temperature are percent cold work and impurity content

• Recrystallization temperature decreases with increasing percent cold work.
• It rises with increasing concentrations of impurities.