Consider a two-component alloy with components A and B, with densities of A: 8.2 g/cm³ and B: 12.4 g/cm³. The volume fraction of A is 0.30. What is the weight fraction of A? Select one: O a. 0.221 Ob. 0.688 Oc Od. 0.302 e. 0.846 Of 0.112 0.342

5. a. Would you expect Frenkel defects for anions to exist in ionic ceramics in relatively large concentrations? Why or why not? b. If the energy for Frenkel defect formation in Zno is 2.51 eV, calculate the number of Frenkel defects per cubic meter at 1000°C. Take the density of ZnO at 1000°C as 5.55 g/cm. The atomic weight of zinc is 65.41 g/mol and that of oxygen is 16.00 g/mol.

Draw the following crystallographic planes in the unit cells provided below a. (211) b. (301)c.(110) x x x

44

For a ceramic compound, what are the two characteristics of the component ions that determine the crystal structure?

4. Why do FCC and HCP have identical atomic packing factors (0.74) if they have different crystal structures?

Which alloy is a combination of metal and non-metal? Steel O Bronze O Solder O Brass

6. What is the composition, in weight percent, of an alloy that consists of 6 at% Pb and 94 at% Sn?

Modern commercial airliners are largely made of aluminum, a light and strong metal. But the fact that aluminum is cheap enough that airplanes can be made out of it is a bit of historical luck. Before the discovery of the Hall-Héroult process in  1886 , aluminum was as rare and expensive as gold. What would happen if airplanes had to be made of steel? The fuselage of the Airbus A380, which can carry  575  passengers, is approximately a hollow aluminum cylinder without ends,  72.0m  long,  8.4m  wide, and  2.5mm  thick (see sketch at right).   The fuselage of an airplane   Suppose this fuselage was made of steel (density  7.87/gcm3 ) instead of aluminum (density  2.70/gcm3 ), and let's say the average passenger has a mass of  83kg . We'll also assume the engines can't lift any greater mass than they already do. Calculate the number of passengers that the Airbus A380 could carry if its fuselage was made of steel.

PdB0.15 is a which type alloy