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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Give three examples of materials processes that rely on diffusion in solids and explain how diffusion plays a critical role for one of those processes.
In precipitation hardening, after being quenched into solution, overcooling is done and then either artificial aging is done at 180-250°C or natural aging is done at room temperature, both of which occur through diffusion, where temperature and time parameters are dominant. While 180°C and 250°C provide sufficient temperature for diffusion, is it not interesting that diffusion occurs at room temperature? This is because of the thermal energy of atoms causing them to move, which may facilitate diffusion at room temperature.
Answer in a brief and concise essay. 1. Why does diffusion in solids important?
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Compare interstitial and vacancy atomic mechanisms for diffusion and cite two reasons why interstitial diffusion is normally more rapid than vacancy diffusion.
(4) shown on the diagram below. Explain the variation of the thermal conductivity of MgO with temperature as 50 BeO MgO Al,0, 20 MgO Al,0, Cao UO, 10 SiO TIO, Fused quartz Stabilized ZrO, Dense chrome brick 1920K Insulating firebrick 181OK Insulating firebrick 2300K Insulating firebrick 0.5 Medium pores Fine pores Diatomaceous earth Lightweight concrete Coarse pores insulating brick 0.2 Expanded vermiculite 0.1 Loose MgO powder 0.05 400 800 1200 Temperature, K 1600 2000 Thermal Conductivity k, W/m/K
1. What is diffusion? Briefly explain the difference between self-diffusion and interdiffusion. 2. Compare interstitial and vacancy atomic mechanisms for diffusion. 3. Differentiate steady-state diffusion to nonsteady-state diffusion.
What are the differences between Equimolar counter diffusion (EMD) and Uni molecular diffusion
Why is the rate of interstitial diffusion mechanism higher than that of vacancy diffusion? * There are more interstitial sites and interstitial atoms are smaller. There are fewer interstitial sites and interstitial atoms are larger. There are more interstitial sites and interstitial atoms are larger. There are fewer interstitial sites and interstitial atoms are smaller.
In copper, what percentage of the volume change which occurs as the specimen is heated from room temperature to its melting point is due to the increased vacancy concentration, assuming that the vacancy concentration is just below the melting point (1083 oC) is 10-4. Given: Assume that the linear thermal expansion coefficient of copper is 16.5×10-6 K-1 over the whole temperature range.

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