What is primarily found in the grain body of metals?

The grain body of metals is predominantly composed of crystalline regions. Metals are structured in a way that their atoms are arranged in a highly ordered pattern, which forms a crystalline lattice. This crystalline structure is essential for the mechanical properties of metals, such as strength and ductility. Each grain in the metal consists of a single crystal, and the boundaries between these grains are known as grain boundaries, which can affect the overall behavior of the metal when subjected to stress or other forces.

The highly organized arrangement of atoms within these crystalline regions allows for the effective transfer of electrons and contributes to the material's ability to conduct heat and electricity. Additionally, the properties of metals, including hardness and resistance to deformation, are greatly influenced by the size and orientation of these grains, making the crystalline structure critical for engineers when selecting materials for specific applications.

While liquid phases, gas phases, and amorphous regions do exist in some materials, they are not characteristic of the solid structure of metals in their typical, solid state. The presence of crystalline regions is what distinguishes metals in terms of their physical properties and behavior under various conditions.