Metals Review - EMA4120 Physical Metallurgy I, Review of...

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EMA4120 Physical Metallurgy I, Review of Metals University of Florida, Dept. of Materials Science and Engineering 1 EMA4120 Physical Metallurgy I Review of Metals Paul Holloway 202 Rhines Hall 846-3330 pholl@mse.ufl.edu
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EMA4120 Physical Metallurgy I, Review of Metals University of Florida, Dept. of Materials Science and Engineering 2 Jargon Alloy = a metal containing 2 (binary), 3 (ternary) or more elements Alloying element = an element intentionally added to a base metal element Alloying elements will affect some properties positively, other negative E.g. alloying generally increases UTS, decreases ductility Impurity = any element in a metal not intentionally added, whether or not its effects are detectable and/or undesirable All materials contain impurities, therefore must always discuss the properties and microstructure of a metals with a purity of x% Pure Al has a purity that varies from commercial purity of 99% to research grade of 99.999% Objective of course is to provide a physical basis to understand that metal exhibit a correlation between their Structure-Property-Processing and this influences the application of the metals and alloys
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EMA4120 Physical Metallurgy I, Review of Metals University of Florida, Dept. of Materials Science and Engineering 3 Review of Structure and Properties Metals are composed of atoms from the periodic table Nucleus (protons and neutrons) and electrons Atomic weight = W; atomic number = Z Subatomic particles Atomic dimensions are 1-2Å = 1-2 x 10 -8 cm 1Å/1 cm = 1 ft/circumference of earth Atoms can assemble randomly (amorphous) or orderly (crystalline) Random = glass, polymers, wood, organic molecules, biomolecules, etc. Random arrangements often exhibit short range order (e.g. liquids) Crystalline = metals, ceramics, oxides, sulfides, minerals, rocks, etc. Crystalline materials exhibit long range order and atoms are held in place to + 0.0001Å by repulsive and attractive forces Amorphous materials exhibit short range order and atoms are held in place at variable distances and bond angles by repulsive and attractive forces
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EMA4120 Physical Metallurgy I, Review of Metals University of Florida, Dept. of Materials Science and Engineering 4 Atomic Forces Repulsion force equilibrium Attraction force Potential Energy, E 0
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EMA4120 Physical Metallurgy I, Review of Metals University of Florida, Dept. of Materials Science and Engineering 5 Unit Cell The unit cell is the smallest structural unit or building block that can describe the crystal structure. Repetition of the unit cell generates the entire crystal. Bravais Lattice: combination of unit cell and position within the unit cell where atoms or groups of atoms are located Example: 2D honeycomb net can be represented by translation of two adjacent atoms that form a unit cell for this 2D crystalline structure Example: translation of 3D Bravais Lattice fills space with atoms of same symmetry; often referred to as unit cell.
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This note was uploaded on 11/16/2011 for the course MSE 4120 taught by Professor Holloway during the Fall '11 term at University of Florida.

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Metals Review - EMA4120 Physical Metallurgy I, Review of...

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