HW_CH_8 - IE 320 - Spring 2003 Homework Ch. 8 Introduction...

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Homework Ch. 8 2 Introduction to Materials Science 8.1 To provide some perspective on the dimensions of atomic defects, consider a metal specimen that has a dislocation density of 10 4 mm -2 . Suppose that all the dislocations in 1000mm 3 (1 cm 3 ) were somehow removed and linked end to end. How far (in miles) would this chain extend? Now suppose that the density is increased to 10 10 mm-2 by cold working. What would be the chain length of dislocations in 1000 mm 3 of material? 8.7 One slip system for the BCCcrystal structure is {110}< 111>. In a manner similar to Figure 8.6b sketch a {110}-type plane for the BCC structure, representing atom positions with circles. Now, using arrows, indicate two different <111> slip directions within this plane.
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3 Introduction to Materials Science 8.19 (a) From the plot of yield strength versus (grain diameter) - 1/2 for a 70 Cu–30 Zn cartridge brass, Figure 8.15, determine values for the constants s 0 and k y in Equation 8.5. (b) Now predict the yield strength of this alloy when the average grain diameter is 1.0 x10 -3 mm.
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HW_CH_8 - IE 320 - Spring 2003 Homework Ch. 8 Introduction...

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