Homework 6 - You may still use G=26 GPa, b=0.286 nm. The...

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ME 382 Winter 2010 Homework 6 (Due on Fri, Feb 26 th 2010) Problem 1. Ashby & Jones I, 10.1. Problem 2. Ashby & Jones I, 10.3. Assume that the yield strength of a polycrystal is 1.5x the yield strength of the corresponding single crystal. Problem 3. Presume that you have a method for making very fine particles of Al 2 O 3 in pure aluminum. Estimate the increase in strength over that of pure aluminum for a volume fraction of Al 2 O 3 of 5 % and a particle size of 200 nm.
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Unformatted text preview: You may still use G=26 GPa, b=0.286 nm. The (tensile) yield strength of aluminum is Y =40 MPa and that of alumina (Al 2 O 3 ) is 5000 MPa. Problem 4. With the information provided for Problem 3, estimate the strength over that of pure aluminum for a volume fraction of Al2O3 of 5% and a particle size of 100 nm. Problem 5. At what particle size does the mechanism of dislocation motion through the precipitates change? 4.46 nm....
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This note was uploaded on 05/12/2010 for the course MECHENG 382 taught by Professor Thouless during the Spring '08 term at University of Michigan.

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