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Problem 5.27 The diffusion coefficients for species A in metal B are given at two temperatures:...
Problem 5.27 x Incorrect The diffusion coefficients for species A in metal 8 are given at two temperatures TrC) (m2/s) 1010 8.63 10 1260 8.50x 101 (a) Determine the value of the activation energy a (in J/mol) 162636 /mo (b) Determine the value of O m2/s (Use scientific notation) 000000000023 (c) What is the magnitude of Dat 1180°C? 0.00000000000000033 m s (Use scientific notation) Click if you would like to Show Work for this question: Open Show Wrk
The diffusion coefficients for species A in metal B are given at two temperatures: T (°C)D (m2/s) 1020 7.23 x 10 1290 7.09% 10-16 (a) Determine the value of the activation energy Qd (in נ/mol). J/mol (b) Determine the value of Do m2/s (Use scientific notation.) (c) What is the magnitude of D at 1180°C? m2/s (Use scientific notation.)
The diffusion coefficients for carbon in nickel are given at two temperatures: T (˚C) D (m2/s) 600 5.5 × 10-14 700 3.9 × 10-13 (a) Determine the value of D0 in m^2/s (b) Determine the value of Qd in kJ/mol (c) What is the magnitude of D? at 850˚C in m^2/s
UTVER VIS Concentration of Nitrogen (wt%): = 0.21 Position in mm= 7.2 Diffusion Coefficient for Nitrogen in Iron at 700°C -8.90E-10 Nitrogen in Iron Heat Treatment Time (hours): = 8 Carburizing Time (hrs): = 7 Steel Alloy Case Depth (mm): 4.8 Steel Alloy New Case Depth (mm) - 9.9 Activation Energy kJ/mol: = 103 Temperature for Problem 3 (Celsius) -809 . Data for Problem 4 Temperature in C: -595 Diffusivity (m2/s) = 5.62E-14 Temperature in C: -702 Diffusivity (m /s)...
The steady-state diffusion flux through a metal plate is 5.4 x 10 at a temperature of 727°C and when the I mis concentration gradient is - 3 : Calculate the diffusion flux (same units as flux provided) at 1027°C for the same . Y concentration gradient and assuming an activation energy for diffusion of 125,000 J/mol. Enter your answer in scientific notation with 2 decimal places e.g. 1.2E-3
A diffusion couple composed of two silver– gold alloys is formed; these alloys have compositions of 98 wt% Ag–2 wt% Au and 95 wt% Ag– 5 wt% Au. Determine the time this diffusion couple must be heated at 750°C (1023 K) in order for the composition to be 2.5 wt% Au at the 50 μm position into the 2 wt% Au side of the diffusion couple. Preexponential and activation energy values for Au diffusion in Ag are 8.5 × 10−5...
4) A piece of steel is to be hardened by nitrogen diffusion into its outer layer. The initial nitrogen content of the steel is 0.010 wt%, and the surface concentration (from an external nitrogen-rich gas) is to be maintained at 0.75 wt%. Goal: nitrogen content of 0.25 wt% at a position of 0.50 mm below the surface. Specify a minimum of three appropriate heat treatments (time and temperature combinations) for temperatures between 600°C and 850°C (use the minimum and maximum...
5. It is believed that interstitial diffusion is faster than vacancy diffusion. Can you show this by comparing the values of diffusion coefficients of a pair of cases (one values for each type of diffusion) from Table 5.2.. -(5 points) Diffusing Species Q. (J/mol) с 87,400 148,000 77,000 168,000 Nº N° Feº Fe Cud Alº Mg Znº Mod Host Metal D, (m/s) Interstitial Diffusion Fe (1 or BCC) 1.1 x 10-6 Fe (I or FCC) 2.3 * 105 Fe (...
QUESTION 1 The binary gaseous diffusion coefficients of air in methyl chloride CH;Cl at 298 K and 1 atm have been determined. A simple diffusion cell was used, in which concentration changes of the diffusing gas were followed by infrared spectro- photometre. The diffusion coefficient DAB value measured is 1.434 x10 m2/s a) State two assumption of kinetic gas theory (4 Marks) b) Determine the diffusion coefficient, DAB using Chapman Enskog calculated by a kinetic theory equation using the Lennard-Jones...
Please use the following to answer the below: A fictional galvanic (voltaic) cell consists of an electrode composed of a metal, M, in a 1.0 mol/L M2+ ion solution and a second electrode composed of an unreactive platinum metal (Pt) in a 1.0 mol/L X– ion solution, connected by a salt bridge and an external wire at 25.0 ⁰C. Consider the two entries below from a fictional table of standard reduction potentials. Reduction Equation Standard reduction potentials (E⁰reduction) M2+ (aq)...