Lecture4

Lecture4 - ENG166 Foundations of Engineering Instructor Dr....

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ENG166 Foundations of Engineering Required text “Materials In Today’s World” Peter A. Thrower, Jr., 2nd edition, McGraw-Hill Companies, Inc (1996) Instructor Dr. Daniel Goberman [email protected] 486-5478 Office: UTEB. Rm 266 Class Web Site http://www.ims.uconn.edu/~goberman/ENGR166/index.html
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Structure of Materials
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Structure of Materials Five levels of structure: electronic structure, atomic structure, crystal structure, microstructure and macrostructure Bonding between atoms (electronic & atomic structure) determines structure at higher levels (crystal, micro- and macro-structure) Structure & defects in structure ultimately determine material properties Outline: Types of bonding (Ch. 5) Defects in crystals (Ch. 8)
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Defects in Crystals Dislocations (line defects: 1-dimensional) Point defects (0-dimensional) Grain boundaries (planar defects: 2- dimensional)
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Dislocation: line defect (1-dimensional) Extra “half-plane” of atoms in a crystal Dislocations make slip 1000 times easier, which is why metals deform easily Slip of atom planes over each other due to deformation occurs one atom row at a time, analogous to caterpillar motion or moving a pile of bricks one at a time mediates
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Dislocation: line defect (1-dimensional) For the dislocation to move, one atom must slip over another… - ease of individual atom slip dictates ease of bulk deformation. Multiple planes in any crystal structure 1
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Dislocation: line defect (1-dimensional) For the dislocation to move, one atom must slip over another… - ease of individual atom slip dictates ease of bulk deformation.
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Plastic Deformation Force that deformed material is removed and material remains deformed. 2
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This note was uploaded on 04/07/2008 for the course MSE 166 taught by Professor Bob during the Spring '08 term at UConn.

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Lecture4 - ENG166 Foundations of Engineering Instructor Dr....

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