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Title: Diffusion in the intermetallic compound Ni AL
Author: McDonnell, Barry Russell
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1969
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Single crystals and large polycrystals of the intermetallic compound NiAl have been grown by a modified Bridgman technique. The self diffusion coefficient of nickel-63 has been measured in the stoichiometric and in ten non-stoichiometric compositions of the compound, in the temperature range 1000°C to 135000. The results have been interpreted in terms of both linear and non-linear Arrhenius dependences; the latter in recognition of the possibility of there being 'anomalous' diffusion behaviour in this compound. A comparison has been made between the activation energies of self diffusion, as a function of composition, and previously reported activation energies for high temperature deformation. The applicability of the six-jump cycle vacancy mechanism to diffusion in NiAl compounds has been discussed. An estimate of the activation energies of vacancy formation and of motion has been made from the self diffusion activation energies.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available