ME215-2 - NATURE OF METALS AND ALLOYS Chapter 3 ME-215...

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Veljko Samardzic ME-215 Engineering Materials and Processes NATURE OF METALS AND ALLOYS Chapter 3
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Veljko Samardzic ME-215 Engineering Materials and Processes NATURE OF METALS AND ALLOYS Instructor: Veljko Samardzic Office: MEC119, Tel.: 973-596-3247 E-mail: vxs9076@njit.edu Office Hours: Tuesday,11:30 am-12:30 pm, 5:00 pm- 6:00 pm; Thursday, 2:00 pm-3:00 pm
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Veljko Samardzic ME-215 Engineering Materials and Processes 3.1 Structure –Property Relationships Primitive cultures limited to naturally occurring sources; Civilization advancement & materials engineering; Properties must match specific requirements of the application; Material properties are direct result of structure: subatomic structure (protons, neutrons, electrons); atom is a basic unit of an element that can undergo chemical change; atomic bonding (molecule, crystal, amorphous aggregate); microstructure (observed on a microscopic scale).
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Veljko Samardzic ME-215 Engineering Materials and Processes 3.1 Structural Level of Properties Relations
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Veljko Samardzic ME-215 Engineering Materials and Processes 3.1 Structure –Property Relationships Interactive relation to yield improved materials engineering solutions Material properties Material structure change
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Veljko Samardzic ME-215 Engineering Materials and Processes 3.2 The Structure of Atoms Atom composition: nucleus {protons (+), neutrons (neutral), high mass}; electron (-) cloud, equal number as protons, arranged in shells and sub-shells; neutral charge balance;
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Veljko Samardzic ME-215 Engineering Materials and Processes 3.2 The Structure of Atoms Atomic number ; the number of protons in the nucleus of an atom of an element; Electron shell : a group of electrons with the same principal quantum number, n ; Electron shells: shell-1(two electrons); shell-2 (eight electrons); shell-3 (max. 32 electrons); Stable configuration with 8 electrons in 3 rd shell and up; Valence electrons : electrons in the outermost shells which are most often involved in bonding;
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Veljko Samardzic ME-215 Engineering Materials and Processes 3.2 Charged Species Negative ion : formed by accepting an electron into vacant spot in his electron configuration and becomes negatively charged; Positive ion : formed by donating an excess electron into vacant spot of another atom’s electron configuration to become positively charged;
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Veljko Samardzic ME-215 Engineering Materials and Processes 3.3 Atomic Bonding Primary bonds: Ionic bond resulting from the electrostatic attraction of oppositely charged ions, it is nondirectional (e.g. . NaCl crystal); Covalent bond resulting from the sharing of electrons. Mostly by overlapping of half filled orbitals of two
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This note was uploaded on 07/11/2011 for the course IE 101 taught by Professor Me during the Fall '11 term at Gazi Üniversitesi.

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ME215-2 - NATURE OF METALS AND ALLOYS Chapter 3 ME-215...

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