Solid Solution Strengthening or Alloying

what is Solid Solution Strengthening?
It is a strengthening Process.
Adding alloying element will increase the strength of the material.

Adding atoms of alloying element into the crystalline lattice of base metal, the alloying element will diffuse to a matrix solid solution. These solute atoms will cause lattice distortions which then will obstruct dislocation motion, and thus will increase the yield stress of the material. There are two types of this mechanism: Substitutional Solid Solution and Interstitial Solid Solution. The former type involves the solute (alloy) atoms which are larger compared to the solvent (base) atoms being added into crystalline lattice of base metal. They must be the same crystal structure. The instance is Copper-Nickel in FCC structure. While, the latter type involves the solute atoms are smaller than the solvent atoms. The example is the carbon in iron.