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# HW 5 F10 v2 - performance of its aircraft A commercial...

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HW 5 ENMA 300 5.1 Calculate the fraction of atom sites that are vacant for copper at its melting temperature of 1084degC. Assume an energy for vacancy formation of 0.90 eV/atom. 5.12 Some hypothetical alloy is composed of 25 wt% of metal A and 75 wt% of metal B. If the densities of metals A and B are 6.17 and 8.00 g/cm 3 , respectively, whereas their respective atomic weights are 171.3 and 162.0 g/mol, determine whether the crystal structure for this alloy is simple cubic, face-centered cubic, or body-centered cubic. Assume a unit cell edge length of 0.332 nm. 5.D1 Aluminum–lithium alloys have been developed by the aircraft industry to reduce the weight and improve the
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Unformatted text preview: performance of its aircraft. A commercial aircraft skin material having a density of 2.47 g/cm 3 is desired. Compute the concentration of Li (in wt%) that is required. 5.D2 Gallium arsenide (GaAs) and indium arsenide (InAs) both have the zinc blende crystal structure and are soluble in each other at all concentrations. Determine the concentration in weight percent of InAs that must be added to GaAs to yield a unit cell edge length of 0.5820 nm. The densities of GaAs and InAs are 5.316 and 5.668 g/cm 3 , respectively....
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