Mechanical_Properties_Structures_and_Transformations

Mechanical_Propertie - MEGR 2180 Engineering Materials Materials and their Properties MEGR 2180 Engineering Materials Metals Ferrous Steels

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MEGR 2180 ngineering Materials Engineering Materials and their Properties
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MEGR 2180 Engineering Materials etals lastics eramics omposites Metals Plastics Ceramics Composites Nonferrous Ferrous Oxides Nitrides Carbides Reinforced plastic Metal-matrix eramic atrix Steels Stainless steels Tool and die steels Aluminum Copper Titanium Tungsten Glasses Glass Ceramics Graphite iamond Ceramic-matrix Laminates Thermoplastics Thermosets Cast Irons g Elastomers Diamond Acrylics ABS Nylons Polyethylene PVC Epoxies Phenolics Polymides Rubbers Silicones Polyurethanes
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MEGR 2180 Behavior and Manufacturing Properties of Materials Mechanical Physical and Property Structure of Properties Chemical Properties Modification Materials Atomic Bonds Crystalline morphous Strength Ductility lasticity Density Melting Point pecific Heat Heat Treatment Precipitation hardening nnealing p Elasticity Hardness Fatigue Creep Toughness Specific Heat Thermal Conductivity Thermal Expansion Electrical Conductivity Oxidation Annealing Tempering Surface treatment Alloying Reinforcements Fracture Corrosion Composites Laminations Fillers
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MEGR 2180 hy do we care about Why do we care about Crystal Structures • The structure of metals greatly influence their behavior and properties – Composition purities (ALLOYING) Impurities (ALLOYING) –Gra in S ize rain Boundaries Grain Boundaries –Etc…
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MEGR 2180 Crystal Structure of Metals hen metals solidify the atoms arrange • When metals solidify the atoms arrange themselves into an orderly configuration called crystals. • Crystal structure consists of unit cells which repeat to form a crystal lattice . • Four basic types – Simple Cube – Body Centered Cubic (BCC) – Face Centered Cubic (FCC) – Hexagonal Closed Packed (HPC)
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MEGR 2180 The Simple Cube and dy ntered bic B ody C entered C ubic Images taken from http://wps.prenhall.com/wps/media/objects/602/616516/Chapter_10.html
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MEGR 2180 F ace C entered ace et e e d C ubic Images taken from http://wps.prenhall.com/wps/media/objects/602/616516/Chapter_10.html
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MEGR 2180 Simple cubic BCC FCC Images taken from http://wps.prenhall.com/wps/media/objects/602/616516/Chapter_10.html
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MEGR 2180 H exagonal se C lose P acked In both kinds of closest- packing, each sphere is touched by 12 neighbors, 6 in the same layer, 3 in the layer above, and 3 in the layer below Images taken from http://wps.prenhall.com/wps/media/objects/602/616516/Chapter_10.html
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MEGR 2180 Crystalline Structures hy do metals form different crystal • Why do metals form different crystal structures? he appearance of more than one type • The appearance of more than one type of crystal structure is known as llotropism or polymorphism allotropism or polymorphism – Iron BCC below 723 ° C and FCC above 723 ° C – Titanium is HCP below 880 ° C and BCC above 880 ° C
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MEGR 2180 rystalline Structures of Some Metals Crystalline Structures of Some Metals BCC FCC HCP Chromium Columbium Aluminum Cobalt ( β ) Beryllium Cobalt ( α ) Iron ( α ) Molybdenum antalum Iron ( γ ) Copper old Cadmium Magnesium inc Tantalum Titanium ( β ) Tungsten Gold
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This note was uploaded on 10/01/2009 for the course MEGR 2144 taught by Professor Sharpe during the Fall '08 term at UNC Charlotte.

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Mechanical_Propertie - MEGR 2180 Engineering Materials Materials and their Properties MEGR 2180 Engineering Materials Metals Ferrous Steels

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