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222-227Iintroduction eng mats

222-227Iintroduction eng mats - METALS COMPOSITES CERAMICS...

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1 Chapter 3 - METALS CERAMICS POLYMERS COMPOSITES
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2 Chapter 3 - STRUCTURE PROPERTIES MECHANICAL CHEMICAL PHYSICAL THERMAL ELECTRICAL ATOMS ATOMIC BONDING ATOMIC ARRANGEMENT
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3 Chapter 3 - ex: hardness vs structure of steel Properties depend on structure Data obtained from Figs. 10.30(a) and 10.32 with 4 wt% C composition, and from Fig. 11.14 and associated discussion, Callister 7e . Micrographs adapted from (a) Fig. 10.19; (b) Fig. 9.30;(c) Fig. 10.33; and (d) Fig. 10.21, Callister 7e . ex: structure vs cooling rate of steel Processing can change structure Hardness (BHN) Cooling Rate (ºC/s) 100 200 300 400 500 600 0.01 0.1 1 10 100 1000 (d) 30 μ m (c) 4 μ m (b) 30 μ m (a) 30 μ m
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4 Chapter 3 -
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5 Chapter 3 - METALS
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6 Chapter 3 - METALS ATOMS: STRONGLY ELECTROPOSITIVE BONDING: METALLIC ARRANGAMENT: CRYSTALLINE STRUCTURE
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7 Chapter 3 - The Periodic Table Columns: Similar Valence Structure Adapted from Fig. 2.6, Callister 7e. Electropositive elements: Readily give up electrons to become + ions. Electronegative elements: Readily acquire electrons to become - ions. give up 1e give up 2e give up 3e inert gases accept 1e accept 2e O Se Te Po At I Br He Ne Ar Kr Xe Rn F Cl S Li Be H Na Mg Ba Cs Ra Fr Ca K Sc Sr Rb Y
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8 Chapter 3 - SIMPLE CUBIC CRYSTAL STRUCTURE EXAMPLE : Po A HARD – SPHERE UNIT CELL AN AGGREGATE OF MANY ATOMS
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9 Chapter 3 - HEXAGONAL CLOSE – PACKED STRUCTURE [ HCP ] A REDUCED – SPHERE UNIT CELL AN AGGREGATE OF MANY ATOMS EXAMPLES : Be , Cd , Mg , Ti , Zn , Zr ,. ...
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10 Chapter 3 -
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11 Chapter 3 - METALS MECHANICAL: HIGH-E, STRONG, HARD, TOUGH, DUCTILE, ELECTRONIC: CONDUCTORS CHEMICAL: LOW CORROSION RESISTANCE THERMAL: GOOD THERMAL STABILITY PHYSICAL: HEAVY (except Mg, Al) PROPERTIES
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Chapter 3 - METALS CAST IRONS STEELS *PLAIN-C
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222-227Iintroduction eng mats - METALS COMPOSITES CERAMICS...

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