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Lecture10 - ENGR 2220 Structure Properties of Materials...

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ENGR 2220 ENGR 2220 – Structure & Properties of Materials Lecture 10 Dislocations & Strengthening Mechanisms Chapter 7
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Dislocations & Strengthening Mechanisms ISSUES TO ADDRESS... Why are dislocations observed primarily in metals and alloys? How are strength and dislocation motion related? How do we increase strength? How can heating change strength and other properties?
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Observations Plastic (permanent) deformation of metals; t th t tl di i i h d strength not greatly diminished Forging changes plastic deformation properties to great extant without changes in chemical to great extant without changes in chemical composition Metal undergo plastic deformation at forces much ll h h i h i l b d h smaller than their theoretical bond strength predictions Explanation: Dislocations; discovered in 1934 by discovered in 1934 by Taylor, Orowan and Polyani
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