A copper–nickel diffusion couple similar to that shown in Figure 5.1a is fashioned. After a 700-h heat treatment at 1100C (1373 K), the concentration of Cu is 2.5 wt% at the 3.0-mm position within the nickel. At what temperature must the diffusion couple be heated to produce this same concentration (i.e., 2.5 wt% Cu) at a 2.0-mm position after 700 h? The preexponential and activation energy for the diffusion of Cu in Ni 2.7*10^-5(m^2/s) and 256 kJ/mol.

Q: Calculate the diffusion coefficient for the interdiffusion of Zinc into Copper at  500 °C .

A: Required data from the standard table for the diffusion of zinc into copper.

Q: The activation energy for the diffusion of atomic species A in metal B is 118 kJ/mol. Calculate the…

A: D1=Diffusion Coefficient At 1140=6.1×10-11 m2/sT1=Temperature=1140°C=1413.15 kT2=840°C=1113.15…

Q: why diffusion coefficients of carbon in BCC and FCC in iron at temperature 912 c are difference?…

A: Data given-  Carbon  Bcc and fcc  Temprature T = 912°C  = 1185 K .

Q: The diffusion coefficients for iron in nickel are given at two temperatures: T(K) 1273 1473 D (m²/s)…

A: The diffusion constant at T1 = 1273 K is The diffusion constant at The value of the gas constant is…

Q: why vacancy diffusion is more slow than interstitial diffusion?

A: Vacancy diffusion is slower than Interstitial diffusion. Diffusions taking place by vacancies are…

Q: What does(do) determine a diffusion coefficient (diffusivity)? (choose all) a. Concentration…

A: What does(do) determine a diffusion coefficient (diffusivity)?

Q: Rank the magnitudes of the diffusion coefficients from greatest to least for the following systems:…

A: Diffusion coefficient is the amount of particular element that diffuses across a unit area in 1 s…

Q: Problem 2. In carburizing of a piece of low carbon steel with the initial carbon centration 0.2 wt%,…

A: Given the initial carbon concentration and diffusivity and carburizing time.  Required: carbon…

Q: Define the General Heat/Diffusion Equation ?

A: The general heat equation is a multi-dimensional equation or a three-dimensional equation. The three…

Q: A BCC iron alloy containing 0.05 wt% C is carburized at 1050°C such that the carbon concentration is…

A:

Q: For a steel alloy it has been determined that a carburizing heat treatment of 18 h duration at 885°C…

A:

Q: In precipitation hardening, after being quenched into solution, overcooling is done and then either…

A: Precipitation Hardening: Definition: Precipitation Hardening is the heat treatment process which…

Q: Calculate the diffusion constant,

A: GIVEN for the process at a diffusion temperature of T=1150 ⁰C D0 = 5.5 *10-5 m2/s;  Qd = 148,000…

Q: You are examining two materials with the same density. One has a BCC crystal structure, and one has…

A: Given data:- BCC crystal structure HCP crystal structure.  The same density To find:-Which crystal…

Q: hat the value of D at 1150°C is 6.5 × 10-12 m²/s. i m²/s

A: Given: Activation Energy E=103 kJ/mol Diffusion coefficient at T=1150oC; D=6.5×10-12 m2/s To find:…

Q: Problem 4 The preexponential and activation energy for the diffusion of iron in cobalt are 1.1 x 105…

A:

Q: Aluminum atoms are to be diffused into a silicon wafer using both predeposition and drive-in heat…

A: CB=3.5×1019…

Q: Problem 1 A sheet of BCC iron 1 mm thick was exposed to a carburizing gas atmosphere on one side and…

A: On one surface,Cc = 0.012 wt% ; Cfe = 100 - 0.012 = 99.988 wt%Then, concentration of Carbon in kg…

Atomic diffusion in solids

In material science, diffusion can take place in solid, liquid, and gases. In solids, atomic diffusion can take place with the help of thermally activated and randomly vibrating atoms. The atomic diffusion in solids is complex and very slow in comparison to atomic diffusion in liquids and gases because the interatomic distance between the atoms is smaller in solids as compared to liquids and gases.