5-15 Compare the diffusion coefficients of car-bon in BCC and FCC iron at the allotropictransformation temperature of 912°C andexplain the difference. Temperature (°C)2000 1500 1200 1000 900 800 700 60050010-3H in BCC iron10-4H in FCC iron10-5C in FCC iron10-610-7C in BCC iron10-810-9Fe in FeO10-1010-1110-1210-1310-1410-1546 7 8 9 10 11104T (K)512 13Figure 5-12 The diffusion coefficient Das a function of reciprocal temperature for somemetals and ceramics. In this Arrhenius plot, D represents the rate of the diffusion process.A steep slope denotes a high activation energy.Fe in BCC ironFe in FCC ironMg in MgOCa in CaoC in graphiteDiffusion coefficient D (cm²/s)

Draw the given diagram for carbon in BCC and FCC iron only. In the above diagram, the diffusion…

Answered: 5-15 Compare the diffusion coefficients…

5-15 Compare the diffusion coefficients of car- bon in BCC and FCC iron at the allotropic transformation temperature of 912°C and explain the difference.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

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.

Question

5-15 Compare the diffusion coefficients of car-
bon in BCC and FCC iron at the allotropic
transformation temperature of 912°C and
explain the difference.

Temperature (°C)
2000 1500 1200 1000 900 800 700 600
500
10-3
H in BCC iron
10-4
H in FCC iron
10-5
C in FCC iron
10-6
10-7
C in BCC iron
10-8
10-9
Fe in FeO
10-10
10-11
10-12
10-13
10-14
10-15
4
6 7 8 9 10 11
104
T (K)
5
12 13
Figure 5-12 The diffusion coefficient Das a function of reciprocal temperature for some
metals and ceramics. In this Arrhenius plot, D represents the rate of the diffusion process.
A steep slope denotes a high activation energy.
Fe in BCC iron
Fe in FCC iron
Mg in MgO
Ca in Cao
C in graphite
Diffusion coefficient D (cm²/s)

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