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Slip planes in BCC are those with the greatest spacing between them therefore the metals tend to have high strength

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In FCC it contains four close packed planes; one of these can form a slip plane in three possible directions therefore the materials tend to have low strength and high ductility

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HCP contains one close-packed plane; this can form a slip plane in three possible directions therefore metals tend to have low ductility

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these are solids that are composed of many crystallites of varying size and orientation

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this happens when stress not only stretches the bonds between the atoms but also causes them to slide over each other and creates new bonds

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planar defects are defects such as lack of fusion and cracks that lie in one plane.

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this happens when there's an extra half-plane in a lattice

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this happens due to shear stress which causes

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a material under elastic deformation caused by an applied stress will return to to its original shape once the stress is removed.

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this type of defects occurs when a atoms assume a normally unoccupied site in the crystal structure.

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a vacancy is produced when an atom is missing from its original lattice site; so its creates an empty lattice site

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macroscopic effects risks of grain boundary

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macroscopic effects risks of grain boundary

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grain boundaries are known to affect the diffusivity in polycrystalline materials.

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A grain boundary is the interface between two grains or crystals; grain boundaries are 2D defects in the crystal structure.

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Crystals form the grains in the solid metal;the crystals grow depending how long the metal takes to cool.

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As atoms of a pure metal cool, they start to form crystalline lattice structures

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Body-centred cubic (BCC)
Face-centred cubic (FCC)
Hexagonal close-packed (HCP)