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MECH 210 080929 - Imperfections in Solids

MECH 210 080929 - Imperfections in Solids - MECH 210 080929...

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MECH 210 080929 Imperfections in Solids Imperfections Depending on the size, imperfections are classified into point defects, line defects, surface defects, and volume defects. (1) Point defects: vacancies, interstitial atoms, impurity atoms a. Vacancies: - vacant lattice sites which are normally occupied by atoms - number of vacancies increases exponentially with temperature - equilibrium number of vacancies ° ± ² ³ ´ µ - = kT Q exp N N v v b. Interstitial atoms: - atoms crowded into vacant space between regular atoms c. Impurity atoms: - regular atoms replaced by foreign atoms substitutional - foreign atoms located at interstitial sites between regular atoms interstitial - impurity atoms intentionally added to impart specific characteristics alloys - in metal alloys, the host atoms are solvent atoms the atoms of smaller concentration are solute atoms - intermetallic compound: a compound of two metals that has a distinct chemical formula
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