section%209.4%20-%20Strengthening%20Mechanisms - 9.4...

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9.4 Strengthening Mechanisms in Metals Objectives Describe strengthening mechanisms in metals. Given 2 metals, predict which is stronger. Dislocation motion is what causes plastic deformation in metals. One way to reduce plastic deformation might be to get rid of all dislocations in a crystal. While this would work, unfortunately there is no way to do this; there are always dislocations present. Therefore, to reduce plastic deformation and increase yield strength, we need to find ways to stop dislocation motion. In this section we will describe some important characteristics of dislocations, and you will use those to predict how to make a metal stronger. Figure 9.4.1: The effect of impurity atoms on the bond strain around a dislocation. Red atoms have bonds that are in compression, and green atoms have bonds that are in tension. In Figure 9.4.1 we see that around a dislocation the bonds between atoms are stretched and compressed. If there are impurity atoms in the correct locations the stretching and compressing is reduced, and the bonds are closer to their unstrained lengths. GI 9.4.1 In Figure 9.4.1, which crystal or crystals have their bonds closer to the unstrained lengths?
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This note was uploaded on 03/30/2010 for the course EMA 3010 taught by Professor Unknown during the Spring '08 term at University of Florida.

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section%209.4%20-%20Strengthening%20Mechanisms - 9.4...

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