Quiz Spring 2011 - 6 Why were the pennies quenched after a...

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EMA 3013 April 20, 2011 1.) At 200° C, how many different equilibrium phases may exist throughout the entire composition range in the Cu-Zn system? 2.) What is the difference between pennies minted from 1959 up to 1982, and those after 1982? Be specific. 3.) Who was Kirkendall and what was his famous experiment? How did this experiment contribute to our understanding of Materials Science why is it so important?
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4.) Why did the pennies turn a silvery color after the treatment in the Zn + NaOH mixture? 5.) Why did the pennies turn a gold color after the heat treatment?
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Unformatted text preview: 6.) Why were the pennies quenched after a change was noticed during the heat treatment? 7.) Why did one penny fracture at low temperature when struck with a hammer, yet the other penny did not? 8.) Based on what you learned from answering question 3, choose the statement that is true. Diffusion of zinc in an FCC Cu-Zn alloy is faster than diffusion of copper. Diffusion of copper in an FCC Cu-Zn alloy is faster than diffusion of zinc. Diffusion of each element is equal as required by the mechanism of diffusion....
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