Structural featureDimension (m) atomic bonding missing/extra atoms crystals (ordered atoms) second phase particles crystal texturing < 10 -10 10 -10 10.

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Presentation transcript:

Structural featureDimension (m) atomic bonding missing/extra atoms crystals (ordered atoms) second phase particles crystal texturing < > CHAPTER 1: MATERIALS SCIENCE & ENGINEERING 1. Pick ApplicationDetermine required Properties 2. Properties Identify candidate Material(s) 3. Material Identify required Processing Processing: changes structure and overall shape ex: casting, sintering, vapor deposition, doping forming, joining, annealing. Properties: mechanical, electrical, thermal, magnetic, optical, deteriorative. Material: structure, composition. The Materials Selection Process

Electrical Resistivity of Copper: Adding “impurity” atoms to Cu increases resistivity. Deforming Cu increases resistivity. ELECTRICAL

Thermal Conductivity of Copper: --It decreases when you add zinc! THERMAL

Magnetic Permeability vs. Composition: --Adding 3 atomic % Si makes Fe a better recording medium! Magnetic Storage: --Recording medium is magnetized by recording head. MAGNETIC

Transmittance: --Aluminum oxide may be transparent, translucent, or opaque depending on the material structure. single crystal polycrystal: low porosity polycrystal: high porosity OPTICAL

Stress & Saltwater... --causes cracks! Heat treatment: slows crack speed in salt water! DETERIORATIVE

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