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Homework Statement
The linear thermal expansion coefficient of aluminum is 22.2x10-6 m/m K and that of alumina is 5.4x10-6 m/m K. If the criterion for onset of dislocation plasticity is related to thermal mismatch exceeding Burgers vector for aluminum, which is 2.8x10-10 m. What is the maximum thermal cycle range to avoid onset of plasticity?
The Attempt at a Solution
Frankly I find the wording of the question confusing, hoping you guys could shed some light.