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4020-F-2011-Lecture8.1Stacking-Fault-Lab

4020-F-2011-Lecture8.1Stacking-Fault-Lab - MATE 366-Fall...

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MATE 366-Fall 2010 Lab 1: The Role of Stacking Fault Energy (SFE) in the Yield Strength of a Metal: A Microstructural Evolution Study Objective The object of this experiment is to study the influence of stacking fault energy, SFE, on strain hardening of two alloys, aluminum and brass, and the annealing behavior. Samples of (a) 1100 Al (high SFE) and (b) Brass, 30wt%Zn in Cu (low SFE). Aluminum and Brass samples will be rolled and then annealed to see the decrease in hardness with increasing annealing time. Samples of processed (rolled and annealed) Al and brass will be tensile tested. This test measures yield strength, strain hardening rates in tension, ultimate tensile strength, and uniform and total elongation. Additionally, samples showing the initial structure, the deformed structure, partially recrystallized structure, and fully recrystallized structure will be examined using optical metallography and hardness testing. From the combined data, the influence of rolling reduction on the mechanical properties of both alloys, and the recrystallization kinetics and final grain size of brass will be evaluated. This will allow the influence of grain size on the tensile
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