The density and associated percent crystallinity for two polytet The density and associated percent crystallinity for two polytetrafluoroethylene materials are as follows: (a) Compute the densities of totally crystalline and totally amorphous polytetrafluoroethylene. (b) Determine the percent crystallinity of a specimen having a density of 2.26g/cm3.
The corundum crystal structure, found for Al2O3, consists of an The corundum crystal structure, found for Al2O3, consists of an HCP arrangement of O2- ions; the Al3+ ions occupy octahedral positions. (a) What fraction of the available octahedral positions are filled with Al3+ ions? (b) Ketch two close-packed O2âplanes stacked in an AB sequence, and […]
The corrosion rate is to be determined for some divalent The corrosion rate is to be determined for some divalent metal M in a solution containing hydrogen ions. The following corrosion data are known about the metal and solution: (a) Assuming that activation polarization controls both oxidation and reduction reactions, determine the rate of corrosion […]
The constant A in Equation 19.2 is 12π4R/5 , where R is the The constant A in Equation 19.2 is 12p4R/5 , where R is the gas constant and ?D is the Debye temperature (K). Estimate ?D for copper, given that the specific heat is 0.78 J/kg-K at 10 K.
The density and associated percent crystallinity for two nylon 6 The density and associated percent crystallinity for two nylon 6,6 materials are as follows: (a) Compute the densities of totally crystalline and totally amorphous nylon 6,6. (b) Determine the density of a specimen having 55.4%crystallinity.
Silver and palladium both have the FCC crystal structure and Silver and palladium both have the FCC crystal structure and Pd forms a substitutional solid solution for all concentrations at room temperature. Compute the unit cell edge length for a 75 wt% Agâ25 wt% Pd alloy. The room-temperature density of Pd is 12.02 g/cm3, and […]
The concentration of carbon in an iron-carbon alloy is 0.15 The concentration of carbon in an iron-carbon alloy is 0.15 wt%. What is the concentration in kilograms of carbon per cubic meter of alloy?
The chemical formula for manganese ferrite may be written as The chemical formula for manganese ferrite may be written as (MnFe2O4)8 because there are eight formula units per unit cell. If this material has a saturation magnetization of 5.6 ( 105 A/m and a density of 5.00 g/cm3, estimate the number of Bohr magnetons associated […]
The following data are for a transformer steel: The following data are for a transformer steel: (a) Construct a graph of B versus H. (b) What are the values of the initial permeability and initial relative permeability? (c) What is the value of the maximum permeability? (d) At about what H field does this maximum […]
The following creep data were taken on an aluminum alloy The following creep data were taken on an aluminum alloy at 400(C (750(F) and a constant stress of 25MPa (3660psi). Plot the data as strain versus time, then determine the steady-state or minimum creep rate.