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The diffusion coefficients for iron in nickel are given at The diffusion coefficients for iron in nickel are given at two temperatures: (a) Determine the v The mass fraction of eutectoid cementite in an iron-carbon alloy is 0.104. On the basis of this information, is it possible to determine the composition of the alloy? If […]

The diffusion coefficients for iron in nickel are given at The diffusion coefficients for iron in nickel are given at two temperatures: (a) Determine the values of D0 and the activation energy Qd. (b) What is the magnitude of D at 1100?oC (1373K)? Is this the question you were looking for? If so, place your […]

The diffraction peaks shown in figure are indexed according to The diffraction peaks shown in figure are indexed according to the reflection rules for BCC (i.e., the sum h + k + l must be even). Cite the h, k, and l indices for the first four diffraction peaks for FCC crystals consistent with h, […]

The difference between the specific heats at constant pressure The difference between the specific heats at constant pressure and volume is described by the expression where av is the volume coefficient of thermal expansion, v0 is the specific volume (i.e., volume per unit mass, or the reciprocal of density), ß is the compressibility, and T […]

The dielectric constant for a soda–lime glass measured at very The dielectric constant for a soda–lime glass measured at very high frequencies (on the order of 1015 Hz) is approximately 2.3. What fraction of the dielectric constant at relatively low frequencies (1 MHz) is attributed to ionic polarization? Neglect any orientation polarization contributions. Is this […]

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. Is this the question you were looking for? If […]

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 O2–planes 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. Is this the question you […]

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. Is this the question you were looking for? If so, […]