The addition of impurities causes variation in the elastic property of materials. Potassium when added to gold increases its elasticity thereby making it easy to be electroplated.

Young’s modulus = (Force ×Length)/(Area ×Elongation); Area=πr²
Elongation = (Force ×Length)/(Area ×Young’s modulus)
Elongation = 15.9mm.

Poisson’s ratio = Y/2n – 1
Y=2n(1+Poisson’s ratio)
Y=7.915 × 10¹⁰ N/m².

While being hammered or rolled, crystals break into smaller units resulting in increase of their elastic properties.

Annealing is the process of heating a material and then gradually cooling it. While annealing, constituent crystals are uniformly oriented and form larger crystal grains, which results in a decrease in their elastic properties.