5. (a) At the surface of a steel bar there is one carbon atom per 20 unit cells of iron. At 1 mm below the surface, there is one carbon atom per 30 unit cells. The diffusivity at 1000° C is 3 x 10" m/s. The structure at 1000° C is FCC (ao =0.365 nm). How many carbon atoms diffuse through each unit cell per minute?

5. (a) At the surface of a steel bar there is one carbon atom per 20 unit cells of iron. At 1 mm below the surface, there is one carbon atom per 30 unit cells. The diffusivity at 1000° C is 3 x 10" m/s. The structure at 1000° C is FCC (ao =0.365 nm). How many carbon atoms diffuse through each unit cell per minute?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

The Space Lattice and Unit Cells

Every matter consists of atoms, molecules, and ions. If these atoms, molecules, and ions (micro-particles) are represented in a three-dimensional space-occupying certain specific points in space, then these arrangements are termed as space lattices and the specific points which are being occupied by atoms, molecules and ions are termed as lattice points. The atoms, molecules, and ions at the lattice points are generally grouped in a regular fashion and repeat periodically at the three-dimensional space.

Question

5. (a)
At the surface of a steel bar there is one carbon atom per 20 unit cells of iron. At 1 mm
below the surface, there is one carbon atom per 30 unit cells. The diffusivity at 1000° C is 3
x 10' m/s. The structure at 1000° C is FCC (ao = 0.365 nm). How many carbon atoms
diffuse through each unit cell per minute?
(b)
Explain why the phenomenon for creep is so closely related to diffusion.
(c)
Describe some general characteristics of creep resistant materials.

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