The first photomicrograph was taken at 100X; the second, at 500X.
The phases are alpha aluminum, CuAl2, silicon, and Chinese script.
Clearly, the fracture followed the brittle interdendritic phase.
In Specimen 7 we heat treat this brittle casting.
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This as well as the next specimen are further examples of an
alloy similar to the preceding specimens. This is a broken lever
from the lid of a garbage can. The first photomicrograph was taken at 100X; the second, at 500X. |
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What path did the fracture follow ? The phases are alpha aluminum, CuAl2, silicon, and Chinese script. Clearly, the fracture followed the brittle interdendritic phase. In Specimen 7 we heat treat this brittle casting. |