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Self-diffusion coefficients (CHROMIUM ? NIOBIUM ?)

Self-diffusion coefficients (CHROMIUM ? NIOBIUM ?)

Self-diffusion coefficients (CHROMIUM ? NIOBIUM ?)

(OP)
Hello folks, I am having problems to find de the self-diffusion coefficients of Cr and of Nb.

Does anyone have these numbers with reference ?

Thank you a lot for your time to answer me,
Maleck

RE: Self-diffusion coefficients (CHROMIUM ? NIOBIUM ?)

(OP)
Tnank you very much METENGR...very nice hearing from you! I have this book (Frost H. J., Ashby M. F., Deformation Mechanism Maps (Pergamon Press, Oxford, 1982) but they do not show the self-diffusion coefficient of chromium into chromium and that of niobium into niobium. This is what I am really looking for.

Anyway, I did not know this site and it can be very useful since it resumes many parts of the book. Having a electronic version saves a lot of space :) and it weights nothing :)

The other users can have the 18 chapters in their hard-drives browsing the pages :

http://thayer.dartmouth.edu/~defmech/chapter_1.htm
http://thayer.dartmouth.edu/~defmech/chapter_2.htm
(...)
http://thayer.dartmouth.edu/~defmech/chapter_18.htm


Anyway, if someone has the value of the self-difusion of chromium into chromium and that of niobium into niobium (with reference), it would be great !

Thank you again,
Maleck

RE: Self-diffusion coefficients (CHROMIUM ? NIOBIUM ?)

Maleck;
The self diffusion parameters for Cr/Cr and Nb/Nb  are as follows;

Element  Tm    Do            Q
         (K)   (M^2S^-1)  (Kj/mol)
                x 10^4

Cr      2130   1280         441.9
Nb      2740    0.524       395.6

D = Do exp((-Q)/RT)

Note Do value is multiplied by X10^4 to obtain (cm^2s^-1)

Source; Physical Metallurgy Handbook, Sinha
pages 2.44 and 2.45

RE: Self-diffusion coefficients (CHROMIUM ? NIOBIUM ?)

(OP)
This was the best news I have received today :) Thanks a lot for your time in searching this data for me. You are great !

Cheers,
Maleck

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