Material Science

Alloying of Metals

Alloying of Metals Approximately 80% of the one-hundred-plus elements in the periodic table can be classed as metals. A number of these possess combinations of availability and properties that lead to their use as engineering metals where mechanical strength is needed. The most widely used engineering metal is iron, which is the main constituent of […]

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Deformation of Solids

Deformation of Solids There are three basic types of deformation: elastic, plastic, and creep deformation. Elastic deformation is discussed next, and this leads to some rough theoretical estimates of strength for solids. Elastic Deformation Elastic deformation is associated with stretching, but not breaking, the chemical bonds between the atoms in a solid. If an external

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Diffusion in Solids

Diffusion in Solids A flow process that governs the movement of atoms and molecules in solids is called diffusion. The atoms and molecules change their position under influence of thermal energy, stress gradient, electric and magnetic field gradients, and concentration gradient. The process of diffusion can be easily visualized in a liquid but is more

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Corrosion in Metals

Corrosion in Metals The destruction of metals by chemical or electro-chemical reactions with the environment is called as corrosion. Freedom of valence electrons and their conduction is responsible for corrosion in metals. Gold and platinum, the noble metals, do not corrode as they are most inactive. Products of corrosion are either porous or non-porous. These

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Classification of Composite Materials & Fibers

Composite material is a material system composed of two or more dissimilar constituents, differing in forms, insoluble in each other, physically distinct and chemically inhomogeneous. The resulting product possesses properties much different from the properties of constituent materials. Classification of Composite Materials Composite materials, also referred as composites, are broadly classified as Laminated composite Lamina

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Properties of Ceramics

Ceramics are nonmetallic, inorganic, amorphous solids and are mostly metallic oxides. They have poor tensile strength, and are brittle. They can be either crystalline or noncrystalline. Many ceramics are workable in extremely low (cryogenic) temperature range, while many others are able to sustain high temperatures. Silica, silicates, NaCI, rock salt, MgO, CaF2, glasses, CsCl etc.

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