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BME83 cheat sheet 1

BME83 cheat sheet 1 - Grain boundaries slightly disordered...

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Grain boundaries – slightly disordered - high mobility, diffusity, reactivity Interstitial impurities distort lattice structure → introduce stresses Linear defects – one dimensional defects around which atoms are misaligned Twin – reflection of atom positions across a twin plane D=m 2 /s increased loading rate gives less time for dislocations to move past obstacles Crystal – atoms are situated in a repeating or periodic array over large atomic distances long range order exists, position themselves in a repetitive 3D pattern Single crystal – extends throughout entirety of specimen without interruption Noncrystalline – lack systematic and regular arrangement of atoms over relatively large atomic distances Geometrical constraints – enen though one single grain is favourably oriented with applied stress for slip, it cannot deform until the adjacent and less favourably oriented grains are capable of slip atomic distortion is minium
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