# HW8-new - ME311 MATERIALS ENGINEERING SPRING 2011 HOMEWORK...

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ME311 MATERIALS ENGINEERING SPRING 2011 HOMEWORK #8 DUE DATE: April 1, before class PROBLEM 1: To provide some perspective on the dimensions of dislocations, consider a metal specimen that has a dislocation density of 10 5 mm -2 . Suppose that all the dislocations in 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 9 mm -2 by cold working. What would be the chain length in 1 cm 3 of material? PROBLEM 2: A fcc crystal specimen with a lattice parameter of 3.5 Å and a dislocation density of 10 9 cm/cm 3 was subjected to a deformation test. After the deformation test, which was performed at a shear strain rate of = 10 -3 s -1 , the average distance each dislocation has moved was 5 μ m. If the dislocations in this crystal move on the (111) planes along the [110] direction calculate a) The resulting strain after the deformation test, b) the average

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## This note was uploaded on 09/04/2011 for the course ME 311 taught by Professor Meyers during the Spring '08 term at University of Texas.

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HW8-new - ME311 MATERIALS ENGINEERING SPRING 2011 HOMEWORK...

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