HW6_MS115a

HW6_MS115a - MS 115a, Problem Set #6 assigned 11/2/11 due...

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MS 115a, Problem Set #6 assigned 11/2/11 due 11/7/11 1. List and describe three (not more!) strengthening mechanisms used to enhance the mechanical properties of metals. 2. Suppose you have a single crystal of a cubic close-packed metal which is known to have a critical resolved shear stress of 61.8 MPa. (a) Find the largest normal stress that could be applied to a bar of this material in the [1 1 2] direction before dislocations begin to move in the [ 1 0 1] direction in the (1 1 1) plane. (b) Now let this be a body centered cubic metal with slip system [1 1 1]( 1 0 1). Find the largest normal stress that could be applied in the [1 1 2] direction. 3. (a) Calculate the critical resolved shear stress in a crystal if a stress of 265 MPa in the [1 0 0] direction is required to move a dislocation in the [1 1 1 ] direction on the (1 0 1) plane. (b) Is this a BCC or CCP metal? Why? 4. The yield stress of an aluminum alloy is 132 MPa. A specimen has a diameter of 0.01 m and a length of 0.10 m.
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This note was uploaded on 01/03/2012 for the course MS 115a taught by Professor List during the Fall '09 term at Caltech.

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HW6_MS115a - MS 115a, Problem Set #6 assigned 11/2/11 due...

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