Consider a diffusion couple setup between pure tungstenand a tungsten alloy containing 1 at% thorium. Afterseveral minutes of exposure at 2000 C, a transition zone of0.01 cm thickness is established. What is the flux ofthorium atoms at this time if diffusion is due to (a) volumediffusion, (b) grain boundary diffusion, and (c) surfacediffusion?TABLE 5-2 I The effect of the type of diffusion for thorium in tungsten and for self-diffusion insilver*Diffusion Coefficient (D)Diffusion TypeThorium in TungstenSilver in SilverDo cm?/sQ cal/moleDo cm2/sQ cal/mole66,40090,000120,0000.470.0688,90022,75045,700SurfaceGrain boundary0.740.24Volume1.000.99

Diffusion is carried out by three mechanism 1) Self Diffusion it means that random movement of atom…

Answered: Consider a diffusion couple setup…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Problem 4 The preexponential and activation energy for the diffusion of iron in cobalt are 1.1 x 105 m²/s and 253,300 J/mol, respectively. At what temperature will the diffusion coefficient have a value of 2.1 × 10-¹4 m²/s?
A diffusion couple of two metals, A and B, was fashioned as shown: Diffusion of A atoms A-B alloy B Diffusion of B atoms After a 690 hour heat treatment at 1120°C the concentration of A is 1.8 wt% at the 3.2 mm position within Metal B. At what temperature (in Kelvin) must the diffusion couple need to be heated to produce this same concentration at a 2.3 mm position after 690 h? The preexponential and activation energy values for the diffusion of A in B are 1.9 x 104 m²/s and 239 kJ/mol, respectively.
[Decarburization] An FCC iron-carbon alloy initially containing carbon with the concentration, C0, is exposed to anoxygen-rich and virtually carbon-free atmosphere. Under the given conditions, the carbon diffuses from the alloy andreacts at the surface with the oxygen in the atmosphere, meaning that the carbon concentration at the surface position is maintained essentially at 0 wt% C. The subproblems are independent.(1) Determine the diffusion coefficient at the temperature T given below. Use T = 1250 °C(2) When the value of D is given below, what position will the carbon concentration be Cx after a treatment for thetime, t? Use D = 1.93 × 10−10m2 /s; C0 = 0.35 wt%; Cx = 0.11 wt%; t = 12 hr
Problem 3. Phosphorus is diffused into a thick slice of silicon with no previous phosphorus in it at a temperature of 1100°C. If the surface concentration of the phosphorus is 1 x 10 atoms/cm and its concentration at 1 µm is 1 x 105 atoms/cm, how long must be the diffusion time? D = 3.0 x 10 cm?/s for P diffusing in Si at 1100°C.
What are the differences between Equimolar counter diffusion (EMD) and Uni molecular diffusion
A sample of lead has a mass of 31.00 kg and a density of 1.130 x104 kg/m3 at 0°C. (Assume the average linear expansion coefficient for lead is 2.900 x10-5(°C−1).) What is the density of lead at 95.00°C? (Give your answer to four significant figures.)
2. For the image, label the region indicated by the arrow and the expected mechanical response for that region (i.e. is it soft, hard, brittle, ductile), then name the diffusion mechanism to create it White region Phase: Behavior: Dark region Phase: Behavior: Mechanism:

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