MSE_2610_HW_6

# MSE_2610_HW_6 - MSE 2610 Introduction to the Mechanical...

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MSE 2610 Introduction to the Mechanical Properties of Materials Fall 2008 Homework Assignment #6 Due: 30 October 2008 1.) Describe two diffusion mechanisms; include a simple schematic to illustrate both diffusion mechanisms. Answer the following about hypothetical diffusivity constants: a. If the diffusivity of copper in aluminum is equal to 4.74x10 -13 m 2 /s at 600 o C and 4.20x10 -14 m 2 /s at 500 o C, estimate the empirical constants D o and Q for this system. b. This is diffusion data collected for the self-diffusion of aluminum: Temperature (K) Diffusion Constant (m 2 /s) 550 1.53x10 -18 640 2.00 x10 -16 690 1.06 x10 -15 720 2.84 x10 -15 800 3.31 x10 -14 900 3.55 x10 -13 Use linear regression to estimate the empirical constants D o and Q for the self diffusion of aluminum. 2.) A thin film of Co was deposited on the end of a long cylinder of Fe 3 O 4 . Afterwards the cylinder was annealed for 20 hours and the Co concentration measured in sections of the cylinder. The data is presented below, normalized by

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## This note was uploaded on 12/24/2008 for the course MSE 261 taught by Professor Sass during the Fall '06 term at Cornell.

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MSE_2610_HW_6 - MSE 2610 Introduction to the Mechanical...

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