MCE 230_ F10_lec_5 - MCE 230 Materials Science Fall 2010...

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MCE 230 – Materials Science Fall 2010 Lecture - 5
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Crystalline Structure
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Unit cell Atoms Positioning Number of “whole” atoms belonging to the unit cell Coordination number: number of touching neighbor atoms Atomic Packing Factor (APF): how much the unit cell volume is filled with atoms Relation between the atomic radius and the unit cell dimension
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Metallic Structures FCC : Face Centered Cubic Aluminum, Copper, Gold, Nickel BCC : Body Centered Cubic Iron, Chromium, Tungsten HCP : Hexagonal Closed Packed Titanium, Zinc, Cobalt
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Allotropy Some metals and non metals have more than one crystal structure depending on the surrounding environment (temperature and pressure), and so properties change Examples: Carbon ( graphite at room temperature, with very high pressure it is diamond ) Iron (BCC at room temperature, and FCC at high
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This note was uploaded on 12/05/2010 for the course MECHANICAL mce 230 taught by Professor Bassildrass during the Fall '10 term at American University of Sharjah.

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MCE 230_ F10_lec_5 - MCE 230 Materials Science Fall 2010...

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