7. (15 pts.) In the charpy impact experiment, we plotted impact energy vs. temperature for1018 steel, 1045 steel, and 6060 aluminum at a range of temperatures to see how the energyabsorbed on impact varied with temperature. In theory, we know that both steel materialsdisplay a ductile to brittle transition while aluminum does not. With this in mind, whatpossible sources of error occurred in the experiment that would affect the accuracy of ourresults?

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