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ME 111L Unit 2 Lab 2 - primary α constituent Also as the...

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Usman Ansari, Eric Pruden, Roberto Duran ME 111L Unit 2 Lab 2 Increasing the amount of silicon increases β concentration and decreases α concentration. In the diagram above, pure α is on the far left and as more silicon is added, it turns to pure β on the far right. At high temperatures, increasing the amount of silicon decreases the amount of liquid in the β+Liquid solution. Increasing the silicon content affects the amounts of the two microconstituents, called primary α and eutectic solid. As the Mol % increases, the fractional amount of primary α decreases, as noted by the diminishing α part of the phase diagram on the left side. This makes sense since, as one increases the silicon content, the amount of Al is decreased, which in turn affects the amount of
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Unformatted text preview: primary α constituent. Also as the silicon content increases, the fractional amount of the microconstituent eutectic solid increases. This eutectic solid consists of a mixture of the α and β phases. This is also noted on the graph by the increasing silicon curve. • Increased silicon content corresponds to lower ductility; however, the ability to flow is increased. • The microstructure gives evidence of the composition of the specimen. For a higher silicon composition, more β will be present and the specimen will be both harder and stronger; vise versa for lower compositions. The microstructure itself is in a way a physical layout of the specimen. Depending on the microstructure of the alloy, it will handle and react to forces in certain ways....
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