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Aluminum-lithium alloys have been developed by the aircraft industry to reduce the weight and improve the performance of its aircraft. A commercial...

Aluminum–lithium alloys have been developed by the aircraft industry to reduce the weight and improve the performance of its aircraft. A commercial aircraft skin material having a density of 2.47 g/cm3 is desired. Compute the concentration of Li (in wt%) that is required.

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552120_MECH_solution.doc

Let, x = % wt of Lithium
y = % wt of Aluminum Density of Li = 0.534 g/cm^3
Density of Al = 2.7 g/cm^3
0.534x + 2.7 y = 2.47
x+ y=1
Solving the simultaneous equations for x,we get
x = 0.1062 = 10.62...

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