Chapter_4_2

Chapter_4_2 - Game 1: Card Game Game 2: Bar Game person...

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1 Game 1: Card Game A B 2 1 Chapter 4 ME 201: Materials Science, Z. Hao Rule: If a card has a vowel on one side, then it must have an even number on the other side. Question: Which cards would you need to check, in order to determine whether this rule is being obeyed? Game 2: Bar Game person drinking beer person who is not drinking older person (over 18) younger person (under 18) Chapter 4 ME 201: Materials Science, Z. Hao Rule: If a person is drinking alcohol, then he/she must be at least 18. Question: Which people would you need to check up with, in order to determine whether this rule is being obeyed? Game 1 Versus Game 2 Rule: If a card has a vowel on one side, then it must have an even number on the other side A B 2 1 Chapter 4 ME 201: Materials Science, Z. Hao must have an even number on the other side. Rule: If a person is drinking alcohol, then he/she must be at least 18. person drinking beer person who is not drinking older person (over 18) younger person (under 18) 4.1 Solidification: metals/alloys, single crystals, solid solutions Chapter 4 Solidification & Crystalline Imperfection Chapter 4 ME 201: Materials Science, Z. Hao 4.2 Crystalline Imperfection: Point, line, planar, and volume 4.3 Experimental Techniques: TEM, SEM, STM … Crystalline Imperfections ± No crystal is perfect. ± Imperfections affect mechanical properties , chemical properties and electrical properties. ± Imperfections can be classified as Chapter 4 ME 201: Materials Science, Z. Hao ¾ Zero dimension Æ point defects. ¾ One dimension Æ line defects ( dislocations ) ¾ Two dimension defects Æ planar defects ¾ Three dimension defects Æ cracks Point Defects ± Vacancies ± Self-interstitial ± S h ttk if t i Chapter 4 ME 201: Materials Science, Z. Hao Schottky imperfection ± Frenkel Imperfection
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2 Point Defects – Vacancy Vacancy: an atom site from which an atom is missing ± Equilibrium vacancies ¾ Caused by: Local disturbances during solidification Atomic mobility in an existing crystal ¾ In metals Chapter 4 ME 201: Materials Science, Z. Hao Equilibrium concentration of vacancies is < 1 in 10,000 Energy of formation is 1ev.
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This note was uploaded on 04/14/2008 for the course ME 201 taught by Professor Hao during the Fall '07 term at Old Dominion.

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Chapter_4_2 - Game 1: Card Game Game 2: Bar Game person...

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