Review of Chapters 4 - 6 PRS

Review of Chapters 4 - 6 PRS - Review of Chapters 4 - 6 PRS...

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Review of Chapters 4 - 6
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PRS Question What at the two basic types of point defects? 1. Holes and Interstitials 2. Holes and Vacancies 3. Vacancies and Interstitials 4. Vacancies and Extras
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PRS Question Vacancy concentration increases as… Temperature DECREASES TRUE OR FALSE?
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1E-15 1E-13 1E-11 1E-09 1E-07 1E-05 0.001 0.1 0 0.001 0.002 0.003 0.004 1/T Vc The Effect of Temperature on the Vacancy Concentration of Nickel T RT T m
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PRS Question A Schottky defect implies that one cation vacancy exists for each anion vacancy, and vice versa. TRUE or FALSE
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Point Defects Schottky defect 2V Cl and 1V Mg - 2+ Schottky defect 1V Cl and 1V Na - + Cation-anion pair Schottky defect ,, exp 2 fvc vca t van Q CC RT ⎛⎞ == ⎜⎟ ⎝⎠
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PRS Question A solution in which the solute atoms sit in between solvent atoms is called a: 1. Substitutional solution 2. Interstitial solution 3. Complete solution
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Hume-Rothery Rules Guidelines for Complete Solubility • The size difference between the solute and solvent must be no greater than ~15%. • The electronegativities of the two atomic species must be comparable. • The valence of the two species must be similar. • The crystal structures of the two species must be the same. This is required if the alloy are to form a continuous series of solid solutions. Examples would be Cu-Ni and Si-Ge.
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PRS Question The diffusivity of an element diffusing in a solid increases rapidly as temperature increases. True or False?
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Interstitial Diffusion of Carbon in Iron 10 -9 10 -10 10 -13 10 -12 10 -11 0.0009 0.0007 0.0008 0.001 BCC FCC 1/T, K -1 D, m 2 /s
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PRS Question Which of Fick’s Laws applies to time independent diffusion problems? 1. First 2. Second 3. Third
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PRS Question • A steel part is case hardened by carburizing in a carbonaceous atmosphere at 1200 K for 4 hours. A case depth of 0.4 mm is produced. How much additional time is required in the furnace (unchanged conditions) to double the case depth to 0.8 mm? 1. 4 Hours 2. 8 Hours 3. 12 Hours 4. 16 Hours
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Summary Chapter 4 Point defects occur in all types of materials. Point defects and interstitials are thermodynamically stable and have a significant influence on the properties of a material.
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This note was uploaded on 02/03/2011 for the course MSE 2001 taught by Professor Tannebaum during the Spring '08 term at Georgia Institute of Technology.

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Review of Chapters 4 - 6 PRS - Review of Chapters 4 - 6 PRS...

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