Chart 1 shows a phase diagram of the binary silicon aluminum system. a. How many

Question

Chart 1 shows a phase diagram of the binary silicon aluminum system.
a. How many phases exist at 600?C above 2wt% silicon?
b. If it exists, where is the eutectic point?
c. What is the melting point of Si?
d. What is the melting point of Al?
e. Why are Si and Al very poor choices for a solid solution?
f. What are two necessary steps for the solidification of a liquid phase?
g. Is covalent, ionic or metallic bonding present in the solid phase? Why?
h. For a weight percentage of 70% Al, above what temperature is no
solid present?
i. For a weight percentage of 10% Si, below what temperature is no
liquid present?
j. At 1000 ?C what is the maximum Si atomic % composition of the
liquid?

Explanation / Answer

a. How many phases exist at 600C above 2wt% silicon?

This appear to have only alpha phase.... therefore 1 phase

b. If it exists, where is the eutectic point?

The eutectic point is at X = 12.6% approx (the three lines must intersect)

c. What is the melting point of Si?

For Silicon, in the diagram, this appears to be 1414°C (si = 100%)

d. What is the melting point of Al?

For aluminium, this is the left side, so T melting --> 660°C approx

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