When an external tensile load is applied to a material, initially it undergoes elastic deformation and then plastic deformation starts. Elastic deformation is recoverable, while plastic deformation is permanent. The ability of a material to exhibit plastic deformation before the fracture is an indication of ductility. Materials that show substantial plastic deformation under external loading are called ductile materials; while brittle materials exhibit negligible plastic deformation. Similarities and differences between ductile material and brittle material are provided below. Similarities between ductile material and brittle material Both are associated with the plastic deformation of the material under tensile loading. Ductility or brittleness is highly temperature-dependent. For example, a brittle material can behave like a ductile one at an elevated temperature. Similarly, a ductile material at room temperature, when frozen, can automatically convert into brittle materi...
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