Obtain a binary (two-component) phase diagram for a system not discussed in this chapter. Identify the following:
a. Single phase.
b. Three phase reaction.
c. Intermetallic compound.
2. Copper and aluminum are both extremely ductile materials, as evidenced by the manufacture of fine copper wire and aluminum foil. Equal weights of copper and aluminum are melted together to produce an alloy and solidified in a pencil-shaped mold to produce short-length rods approximately 1 4 in. or 6.5 mm in diameter. These rods appear extremely bright and shiny, almost as if they had been chrome-plated. When dropped on a concrete floor from about waist height, however, the rods shatter into a multitude of pieces, a behavior similar to that observed with glass.
a. How might you explain this result?
b. Several of the high-strength aerospace aluminum alloys are aluminum-copper alloys. Explain how the observations above might be useful in providing the desired properties in these alloys.
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