Thermal Bimetallic Expansion Coefficient
Mar 13,2024
The coefficient of thermal expansion is related to the chemical composition of the material, the state of crystallisation, the crystal structure, and the strength of the bonds. Substances with the same composition and different structures do not have the same coefficient of expansion. Crystals with a compact structure have a high coefficient of expansion, while glass, which is similar to amorphous, tends to have a low coefficient of expansion. Materials with high bond strength will generally have low coefficients of expansion.
The alloying elements have an effect on the thermal expansion of alloys. Single-phase homogeneous solid solution alloys composed of simple and non-ferromagnetic metals have expansion coefficients between the expansion coefficients of the inner group elements. The coefficient of expansion of multiphase alloys, on the other hand, depends on the nature and number of constituent phases, and can be approximated as a percentage of the volume occupied by each phase, using the rule of mixing to obtain a rough calculation.
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