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

C_Li=2.3 %

Explanation:

solution:

we know that the average density of a two component alloy is given by:

ρ_avg=100/(C_1/ρ_1+C_2/ρ_2)

2.47 g/cm^3=100/(C_Li/ρ_Li+(100-C_Li)/ρ_aL)

solving for C_Li we get,

C_Li=2.3 %

answer:

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