Problem 2 Defects (10 points) a) Pure copper has a higher ultimato tensile strength than pure zinc. The ultimate tensile strength of pure zinc and the ultimate tensile strength of pure copper are indicated in the plot below Draw a schematic curve showing how you might expect the strength of a zinc-copper alloy to vary from pure nickel to pure copper as a function of composition. Explain the shape of your curve with 1-2 sentences. (2 points) 200 Strength 10 100 20 40 60 b) The plot below shows the ultimate tensile strength of a metal that was cold-worked and then annealed at increasingly higher temperatures. Identify the stages of anncaling that you see in the data, give the approximate temperature ranges for these stages, and explain the features of the plot that led you to these answers. (3 points) Ultimate Tensile Strength (MP) Temperature CC) 5/12